libFLAC: Rename get_client_data_from_decoder function
[flac.git] / src / libFLAC / stream_decoder.c
1 /* libFLAC - Free Lossless Audio Codec library
2  * Copyright (C) 2000-2009  Josh Coalson
3  * Copyright (C) 2011-2016  Xiph.Org Foundation
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * - Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *
12  * - Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  *
16  * - Neither the name of the Xiph.org Foundation nor the names of its
17  * contributors may be used to endorse or promote products derived from
18  * this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32
33 #ifdef HAVE_CONFIG_H
34 #  include <config.h>
35 #endif
36
37 #include <stdio.h>
38 #include <stdlib.h> /* for malloc() */
39 #include <string.h> /* for memset/memcpy() */
40 #include <sys/stat.h> /* for stat() */
41 #include <sys/types.h> /* for off_t */
42 #include "share/compat.h"
43 #include "FLAC/assert.h"
44 #include "share/alloc.h"
45 #include "protected/stream_decoder.h"
46 #include "private/bitreader.h"
47 #include "private/bitmath.h"
48 #include "private/cpu.h"
49 #include "private/crc.h"
50 #include "private/fixed.h"
51 #include "private/format.h"
52 #include "private/lpc.h"
53 #include "private/md5.h"
54 #include "private/memory.h"
55 #include "private/macros.h"
56
57
58 /* technically this should be in an "export.c" but this is convenient enough */
59 FLAC_API int FLAC_API_SUPPORTS_OGG_FLAC = FLAC__HAS_OGG;
60
61
62 /***********************************************************************
63  *
64  * Private static data
65  *
66  ***********************************************************************/
67
68 static const FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
69
70 /***********************************************************************
71  *
72  * Private class method prototypes
73  *
74  ***********************************************************************/
75
76 static void set_defaults_(FLAC__StreamDecoder *decoder);
77 static FILE *get_binary_stdin_(void);
78 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels);
79 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
80 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
81 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
82 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length);
83 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length);
84 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length);
85 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
86 static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj);
87 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
88 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
89 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode);
90 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
91 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
92 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
93 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode);
94 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode);
95 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
96 static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended);
97 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
98 static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data);
99 #if FLAC__HAS_OGG
100 static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes);
101 static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
102 #endif
103 static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
104 static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status);
105 static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
106 #if FLAC__HAS_OGG
107 static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
108 #endif
109 static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
110 static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
111 static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
112 static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
113 static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data);
114
115 /***********************************************************************
116  *
117  * Private class data
118  *
119  ***********************************************************************/
120
121 typedef struct FLAC__StreamDecoderPrivate {
122         FLAC__bool is_ogg;
123         FLAC__StreamDecoderReadCallback read_callback;
124         FLAC__StreamDecoderSeekCallback seek_callback;
125         FLAC__StreamDecoderTellCallback tell_callback;
126         FLAC__StreamDecoderLengthCallback length_callback;
127         FLAC__StreamDecoderEofCallback eof_callback;
128         FLAC__StreamDecoderWriteCallback write_callback;
129         FLAC__StreamDecoderMetadataCallback metadata_callback;
130         FLAC__StreamDecoderErrorCallback error_callback;
131         /* generic 32-bit datapath: */
132         void (*local_lpc_restore_signal)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
133         /* generic 64-bit datapath: */
134         void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
135         /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */
136         void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
137         void *client_data;
138         FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */
139         FLAC__BitReader *input;
140         FLAC__int32 *output[FLAC__MAX_CHANNELS];
141         FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */
142         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
143         uint32_t output_capacity, output_channels;
144         FLAC__uint32 fixed_block_size, next_fixed_block_size;
145         FLAC__uint64 samples_decoded;
146         FLAC__bool has_stream_info, has_seek_table;
147         FLAC__StreamMetadata stream_info;
148         FLAC__StreamMetadata seek_table;
149         FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
150         FLAC__byte *metadata_filter_ids;
151         size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
152         FLAC__Frame frame;
153         FLAC__bool cached; /* true if there is a byte in lookahead */
154         FLAC__CPUInfo cpuinfo;
155         FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
156         FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
157         /* unaligned (original) pointers to allocated data */
158         FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS];
159         FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek or if the metadata has a zero MD5 */
160         FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */
161         FLAC__bool is_seeking;
162         FLAC__MD5Context md5context;
163         FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
164         /* (the rest of these are only used for seeking) */
165         FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */
166         FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */
167         FLAC__uint64 target_sample;
168         uint32_t unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */
169         FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */
170 } FLAC__StreamDecoderPrivate;
171
172 /***********************************************************************
173  *
174  * Public static class data
175  *
176  ***********************************************************************/
177
178 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
179         "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
180         "FLAC__STREAM_DECODER_READ_METADATA",
181         "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
182         "FLAC__STREAM_DECODER_READ_FRAME",
183         "FLAC__STREAM_DECODER_END_OF_STREAM",
184         "FLAC__STREAM_DECODER_OGG_ERROR",
185         "FLAC__STREAM_DECODER_SEEK_ERROR",
186         "FLAC__STREAM_DECODER_ABORTED",
187         "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
188         "FLAC__STREAM_DECODER_UNINITIALIZED"
189 };
190
191 FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = {
192         "FLAC__STREAM_DECODER_INIT_STATUS_OK",
193         "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
194         "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS",
195         "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR",
196         "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE",
197         "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED"
198 };
199
200 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
201         "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
202         "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
203         "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
204 };
205
206 FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = {
207         "FLAC__STREAM_DECODER_SEEK_STATUS_OK",
208         "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR",
209         "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED"
210 };
211
212 FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = {
213         "FLAC__STREAM_DECODER_TELL_STATUS_OK",
214         "FLAC__STREAM_DECODER_TELL_STATUS_ERROR",
215         "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED"
216 };
217
218 FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = {
219         "FLAC__STREAM_DECODER_LENGTH_STATUS_OK",
220         "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR",
221         "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED"
222 };
223
224 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
225         "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
226         "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
227 };
228
229 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
230         "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
231         "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
232         "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH",
233         "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM"
234 };
235
236 /***********************************************************************
237  *
238  * Class constructor/destructor
239  *
240  ***********************************************************************/
241 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void)
242 {
243         FLAC__StreamDecoder *decoder;
244         uint32_t i;
245
246         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
247
248         decoder = calloc(1, sizeof(FLAC__StreamDecoder));
249         if(decoder == 0) {
250                 return 0;
251         }
252
253         decoder->protected_ = calloc(1, sizeof(FLAC__StreamDecoderProtected));
254         if(decoder->protected_ == 0) {
255                 free(decoder);
256                 return 0;
257         }
258
259         decoder->private_ = calloc(1, sizeof(FLAC__StreamDecoderPrivate));
260         if(decoder->private_ == 0) {
261                 free(decoder->protected_);
262                 free(decoder);
263                 return 0;
264         }
265
266         decoder->private_->input = FLAC__bitreader_new();
267         if(decoder->private_->input == 0) {
268                 free(decoder->private_);
269                 free(decoder->protected_);
270                 free(decoder);
271                 return 0;
272         }
273
274         decoder->private_->metadata_filter_ids_capacity = 16;
275         if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
276                 FLAC__bitreader_delete(decoder->private_->input);
277                 free(decoder->private_);
278                 free(decoder->protected_);
279                 free(decoder);
280                 return 0;
281         }
282
283         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
284                 decoder->private_->output[i] = 0;
285                 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
286         }
287
288         decoder->private_->output_capacity = 0;
289         decoder->private_->output_channels = 0;
290         decoder->private_->has_seek_table = false;
291
292         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
293                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
294
295         decoder->private_->file = 0;
296
297         set_defaults_(decoder);
298
299         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
300
301         return decoder;
302 }
303
304 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
305 {
306         uint32_t i;
307
308         if (decoder == NULL)
309                 return ;
310
311         FLAC__ASSERT(0 != decoder->protected_);
312         FLAC__ASSERT(0 != decoder->private_);
313         FLAC__ASSERT(0 != decoder->private_->input);
314
315         (void)FLAC__stream_decoder_finish(decoder);
316
317         if(0 != decoder->private_->metadata_filter_ids)
318                 free(decoder->private_->metadata_filter_ids);
319
320         FLAC__bitreader_delete(decoder->private_->input);
321
322         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
323                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
324
325         free(decoder->private_);
326         free(decoder->protected_);
327         free(decoder);
328 }
329
330 /***********************************************************************
331  *
332  * Public class methods
333  *
334  ***********************************************************************/
335
336 static FLAC__StreamDecoderInitStatus init_stream_internal_(
337         FLAC__StreamDecoder *decoder,
338         FLAC__StreamDecoderReadCallback read_callback,
339         FLAC__StreamDecoderSeekCallback seek_callback,
340         FLAC__StreamDecoderTellCallback tell_callback,
341         FLAC__StreamDecoderLengthCallback length_callback,
342         FLAC__StreamDecoderEofCallback eof_callback,
343         FLAC__StreamDecoderWriteCallback write_callback,
344         FLAC__StreamDecoderMetadataCallback metadata_callback,
345         FLAC__StreamDecoderErrorCallback error_callback,
346         void *client_data,
347         FLAC__bool is_ogg
348 )
349 {
350         FLAC__ASSERT(0 != decoder);
351
352         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
353                 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
354
355         if(FLAC__HAS_OGG == 0 && is_ogg)
356                 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
357
358         if(
359                 0 == read_callback ||
360                 0 == write_callback ||
361                 0 == error_callback ||
362                 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback))
363         )
364                 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
365
366 #if FLAC__HAS_OGG
367         decoder->private_->is_ogg = is_ogg;
368         if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect))
369                 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
370 #endif
371
372         /*
373          * get the CPU info and set the function pointers
374          */
375         FLAC__cpu_info(&decoder->private_->cpuinfo);
376         /* first default to the non-asm routines */
377         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
378         decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
379         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
380         /* now override with asm where appropriate */
381 #ifndef FLAC__NO_ASM
382         if(decoder->private_->cpuinfo.use_asm) {
383 #ifdef FLAC__CPU_IA32
384                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
385 #ifdef FLAC__HAS_NASM
386                 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_asm_ia32; /* OPT_IA32: was really necessary for GCC < 4.9 */
387                 if (decoder->private_->cpuinfo.x86.mmx) {
388                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
389                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
390                 }
391                 else {
392                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
393                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
394                 }
395 #endif
396 #if FLAC__HAS_X86INTRIN && ! defined FLAC__INTEGER_ONLY_LIBRARY
397 # if defined FLAC__SSE4_1_SUPPORTED
398                 if (decoder->private_->cpuinfo.x86.sse41) {
399 #  if !defined FLAC__HAS_NASM  /* these are not undoubtedly faster than their MMX ASM counterparts */
400                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_intrin_sse41;
401                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_16_intrin_sse41;
402 #  endif
403                         decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_intrin_sse41;
404                 }
405 # endif
406 #endif
407 #elif defined FLAC__CPU_X86_64
408                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_X86_64);
409                 /* No useful SSE optimizations yet */
410 #endif
411         }
412 #endif
413
414         /* from here on, errors are fatal */
415
416         if(!FLAC__bitreader_init(decoder->private_->input, read_callback_, decoder)) {
417                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
418                 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
419         }
420
421         decoder->private_->read_callback = read_callback;
422         decoder->private_->seek_callback = seek_callback;
423         decoder->private_->tell_callback = tell_callback;
424         decoder->private_->length_callback = length_callback;
425         decoder->private_->eof_callback = eof_callback;
426         decoder->private_->write_callback = write_callback;
427         decoder->private_->metadata_callback = metadata_callback;
428         decoder->private_->error_callback = error_callback;
429         decoder->private_->client_data = client_data;
430         decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
431         decoder->private_->samples_decoded = 0;
432         decoder->private_->has_stream_info = false;
433         decoder->private_->cached = false;
434
435         decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
436         decoder->private_->is_seeking = false;
437
438         decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */
439         if(!FLAC__stream_decoder_reset(decoder)) {
440                 /* above call sets the state for us */
441                 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
442         }
443
444         return FLAC__STREAM_DECODER_INIT_STATUS_OK;
445 }
446
447 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream(
448         FLAC__StreamDecoder *decoder,
449         FLAC__StreamDecoderReadCallback read_callback,
450         FLAC__StreamDecoderSeekCallback seek_callback,
451         FLAC__StreamDecoderTellCallback tell_callback,
452         FLAC__StreamDecoderLengthCallback length_callback,
453         FLAC__StreamDecoderEofCallback eof_callback,
454         FLAC__StreamDecoderWriteCallback write_callback,
455         FLAC__StreamDecoderMetadataCallback metadata_callback,
456         FLAC__StreamDecoderErrorCallback error_callback,
457         void *client_data
458 )
459 {
460         return init_stream_internal_(
461                 decoder,
462                 read_callback,
463                 seek_callback,
464                 tell_callback,
465                 length_callback,
466                 eof_callback,
467                 write_callback,
468                 metadata_callback,
469                 error_callback,
470                 client_data,
471                 /*is_ogg=*/false
472         );
473 }
474
475 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream(
476         FLAC__StreamDecoder *decoder,
477         FLAC__StreamDecoderReadCallback read_callback,
478         FLAC__StreamDecoderSeekCallback seek_callback,
479         FLAC__StreamDecoderTellCallback tell_callback,
480         FLAC__StreamDecoderLengthCallback length_callback,
481         FLAC__StreamDecoderEofCallback eof_callback,
482         FLAC__StreamDecoderWriteCallback write_callback,
483         FLAC__StreamDecoderMetadataCallback metadata_callback,
484         FLAC__StreamDecoderErrorCallback error_callback,
485         void *client_data
486 )
487 {
488         return init_stream_internal_(
489                 decoder,
490                 read_callback,
491                 seek_callback,
492                 tell_callback,
493                 length_callback,
494                 eof_callback,
495                 write_callback,
496                 metadata_callback,
497                 error_callback,
498                 client_data,
499                 /*is_ogg=*/true
500         );
501 }
502
503 static FLAC__StreamDecoderInitStatus init_FILE_internal_(
504         FLAC__StreamDecoder *decoder,
505         FILE *file,
506         FLAC__StreamDecoderWriteCallback write_callback,
507         FLAC__StreamDecoderMetadataCallback metadata_callback,
508         FLAC__StreamDecoderErrorCallback error_callback,
509         void *client_data,
510         FLAC__bool is_ogg
511 )
512 {
513         FLAC__ASSERT(0 != decoder);
514         FLAC__ASSERT(0 != file);
515
516         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
517                 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
518
519         if(0 == write_callback || 0 == error_callback)
520                 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
521
522         /*
523          * To make sure that our file does not go unclosed after an error, we
524          * must assign the FILE pointer before any further error can occur in
525          * this routine.
526          */
527         if(file == stdin)
528                 file = get_binary_stdin_(); /* just to be safe */
529
530         decoder->private_->file = file;
531
532         return init_stream_internal_(
533                 decoder,
534                 file_read_callback_,
535                 decoder->private_->file == stdin? 0: file_seek_callback_,
536                 decoder->private_->file == stdin? 0: file_tell_callback_,
537                 decoder->private_->file == stdin? 0: file_length_callback_,
538                 file_eof_callback_,
539                 write_callback,
540                 metadata_callback,
541                 error_callback,
542                 client_data,
543                 is_ogg
544         );
545 }
546
547 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE(
548         FLAC__StreamDecoder *decoder,
549         FILE *file,
550         FLAC__StreamDecoderWriteCallback write_callback,
551         FLAC__StreamDecoderMetadataCallback metadata_callback,
552         FLAC__StreamDecoderErrorCallback error_callback,
553         void *client_data
554 )
555 {
556         return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
557 }
558
559 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE(
560         FLAC__StreamDecoder *decoder,
561         FILE *file,
562         FLAC__StreamDecoderWriteCallback write_callback,
563         FLAC__StreamDecoderMetadataCallback metadata_callback,
564         FLAC__StreamDecoderErrorCallback error_callback,
565         void *client_data
566 )
567 {
568         return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
569 }
570
571 static FLAC__StreamDecoderInitStatus init_file_internal_(
572         FLAC__StreamDecoder *decoder,
573         const char *filename,
574         FLAC__StreamDecoderWriteCallback write_callback,
575         FLAC__StreamDecoderMetadataCallback metadata_callback,
576         FLAC__StreamDecoderErrorCallback error_callback,
577         void *client_data,
578         FLAC__bool is_ogg
579 )
580 {
581         FILE *file;
582
583         FLAC__ASSERT(0 != decoder);
584
585         /*
586          * To make sure that our file does not go unclosed after an error, we
587          * have to do the same entrance checks here that are later performed
588          * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned.
589          */
590         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
591                 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
592
593         if(0 == write_callback || 0 == error_callback)
594                 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
595
596         file = filename? flac_fopen(filename, "rb") : stdin;
597
598         if(0 == file)
599                 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
600
601         return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg);
602 }
603
604 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file(
605         FLAC__StreamDecoder *decoder,
606         const char *filename,
607         FLAC__StreamDecoderWriteCallback write_callback,
608         FLAC__StreamDecoderMetadataCallback metadata_callback,
609         FLAC__StreamDecoderErrorCallback error_callback,
610         void *client_data
611 )
612 {
613         return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
614 }
615
616 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file(
617         FLAC__StreamDecoder *decoder,
618         const char *filename,
619         FLAC__StreamDecoderWriteCallback write_callback,
620         FLAC__StreamDecoderMetadataCallback metadata_callback,
621         FLAC__StreamDecoderErrorCallback error_callback,
622         void *client_data
623 )
624 {
625         return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
626 }
627
628 FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
629 {
630         FLAC__bool md5_failed = false;
631         uint32_t i;
632
633         FLAC__ASSERT(0 != decoder);
634         FLAC__ASSERT(0 != decoder->private_);
635         FLAC__ASSERT(0 != decoder->protected_);
636
637         if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
638                 return true;
639
640         /* see the comment in FLAC__stream_decoder_reset() as to why we
641          * always call FLAC__MD5Final()
642          */
643         FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
644
645         free(decoder->private_->seek_table.data.seek_table.points);
646         decoder->private_->seek_table.data.seek_table.points = 0;
647         decoder->private_->has_seek_table = false;
648
649         FLAC__bitreader_free(decoder->private_->input);
650         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
651                 /* WATCHOUT:
652                  * FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN()
653                  * require that the output arrays have a buffer of up to 3 zeroes
654                  * in front (at negative indices) for alignment purposes;
655                  * we use 4 to keep the data well-aligned.
656                  */
657                 if(0 != decoder->private_->output[i]) {
658                         free(decoder->private_->output[i]-4);
659                         decoder->private_->output[i] = 0;
660                 }
661                 if(0 != decoder->private_->residual_unaligned[i]) {
662                         free(decoder->private_->residual_unaligned[i]);
663                         decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
664                 }
665         }
666         decoder->private_->output_capacity = 0;
667         decoder->private_->output_channels = 0;
668
669 #if FLAC__HAS_OGG
670         if(decoder->private_->is_ogg)
671                 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect);
672 #endif
673
674         if(0 != decoder->private_->file) {
675                 if(decoder->private_->file != stdin)
676                         fclose(decoder->private_->file);
677                 decoder->private_->file = 0;
678         }
679
680         if(decoder->private_->do_md5_checking) {
681                 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16))
682                         md5_failed = true;
683         }
684         decoder->private_->is_seeking = false;
685
686         set_defaults_(decoder);
687
688         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
689
690         return !md5_failed;
691 }
692
693 FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value)
694 {
695         FLAC__ASSERT(0 != decoder);
696         FLAC__ASSERT(0 != decoder->private_);
697         FLAC__ASSERT(0 != decoder->protected_);
698         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
699                 return false;
700 #if FLAC__HAS_OGG
701         /* can't check decoder->private_->is_ogg since that's not set until init time */
702         FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value);
703         return true;
704 #else
705         (void)value;
706         return false;
707 #endif
708 }
709
710 FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value)
711 {
712         FLAC__ASSERT(0 != decoder);
713         FLAC__ASSERT(0 != decoder->protected_);
714         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
715                 return false;
716         decoder->protected_->md5_checking = value;
717         return true;
718 }
719
720 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
721 {
722         FLAC__ASSERT(0 != decoder);
723         FLAC__ASSERT(0 != decoder->private_);
724         FLAC__ASSERT(0 != decoder->protected_);
725         FLAC__ASSERT((uint32_t)type <= FLAC__MAX_METADATA_TYPE_CODE);
726         /* double protection */
727         if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE)
728                 return false;
729         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
730                 return false;
731         decoder->private_->metadata_filter[type] = true;
732         if(type == FLAC__METADATA_TYPE_APPLICATION)
733                 decoder->private_->metadata_filter_ids_count = 0;
734         return true;
735 }
736
737 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
738 {
739         FLAC__ASSERT(0 != decoder);
740         FLAC__ASSERT(0 != decoder->private_);
741         FLAC__ASSERT(0 != decoder->protected_);
742         FLAC__ASSERT(0 != id);
743         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
744                 return false;
745
746         if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
747                 return true;
748
749         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
750
751         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
752                 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
753                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
754                         return false;
755                 }
756                 decoder->private_->metadata_filter_ids_capacity *= 2;
757         }
758
759         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
760         decoder->private_->metadata_filter_ids_count++;
761
762         return true;
763 }
764
765 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
766 {
767         uint32_t i;
768         FLAC__ASSERT(0 != decoder);
769         FLAC__ASSERT(0 != decoder->private_);
770         FLAC__ASSERT(0 != decoder->protected_);
771         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
772                 return false;
773         for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
774                 decoder->private_->metadata_filter[i] = true;
775         decoder->private_->metadata_filter_ids_count = 0;
776         return true;
777 }
778
779 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
780 {
781         FLAC__ASSERT(0 != decoder);
782         FLAC__ASSERT(0 != decoder->private_);
783         FLAC__ASSERT(0 != decoder->protected_);
784         FLAC__ASSERT((uint32_t)type <= FLAC__MAX_METADATA_TYPE_CODE);
785         /* double protection */
786         if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE)
787                 return false;
788         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
789                 return false;
790         decoder->private_->metadata_filter[type] = false;
791         if(type == FLAC__METADATA_TYPE_APPLICATION)
792                 decoder->private_->metadata_filter_ids_count = 0;
793         return true;
794 }
795
796 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
797 {
798         FLAC__ASSERT(0 != decoder);
799         FLAC__ASSERT(0 != decoder->private_);
800         FLAC__ASSERT(0 != decoder->protected_);
801         FLAC__ASSERT(0 != id);
802         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
803                 return false;
804
805         if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
806                 return true;
807
808         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
809
810         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
811                 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
812                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
813                         return false;
814                 }
815                 decoder->private_->metadata_filter_ids_capacity *= 2;
816         }
817
818         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
819         decoder->private_->metadata_filter_ids_count++;
820
821         return true;
822 }
823
824 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
825 {
826         FLAC__ASSERT(0 != decoder);
827         FLAC__ASSERT(0 != decoder->private_);
828         FLAC__ASSERT(0 != decoder->protected_);
829         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
830                 return false;
831         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
832         decoder->private_->metadata_filter_ids_count = 0;
833         return true;
834 }
835
836 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
837 {
838         FLAC__ASSERT(0 != decoder);
839         FLAC__ASSERT(0 != decoder->protected_);
840         return decoder->protected_->state;
841 }
842
843 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
844 {
845         return FLAC__StreamDecoderStateString[decoder->protected_->state];
846 }
847
848 FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder)
849 {
850         FLAC__ASSERT(0 != decoder);
851         FLAC__ASSERT(0 != decoder->protected_);
852         return decoder->protected_->md5_checking;
853 }
854
855 FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder)
856 {
857         FLAC__ASSERT(0 != decoder);
858         FLAC__ASSERT(0 != decoder->protected_);
859         return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0;
860 }
861
862 FLAC_API uint32_t FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
863 {
864         FLAC__ASSERT(0 != decoder);
865         FLAC__ASSERT(0 != decoder->protected_);
866         return decoder->protected_->channels;
867 }
868
869 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
870 {
871         FLAC__ASSERT(0 != decoder);
872         FLAC__ASSERT(0 != decoder->protected_);
873         return decoder->protected_->channel_assignment;
874 }
875
876 FLAC_API uint32_t FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
877 {
878         FLAC__ASSERT(0 != decoder);
879         FLAC__ASSERT(0 != decoder->protected_);
880         return decoder->protected_->bits_per_sample;
881 }
882
883 FLAC_API uint32_t FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
884 {
885         FLAC__ASSERT(0 != decoder);
886         FLAC__ASSERT(0 != decoder->protected_);
887         return decoder->protected_->sample_rate;
888 }
889
890 FLAC_API uint32_t FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
891 {
892         FLAC__ASSERT(0 != decoder);
893         FLAC__ASSERT(0 != decoder->protected_);
894         return decoder->protected_->blocksize;
895 }
896
897 FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position)
898 {
899         FLAC__ASSERT(0 != decoder);
900         FLAC__ASSERT(0 != decoder->private_);
901         FLAC__ASSERT(0 != position);
902
903         if(FLAC__HAS_OGG && decoder->private_->is_ogg)
904                 return false;
905
906         if(0 == decoder->private_->tell_callback)
907                 return false;
908         if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK)
909                 return false;
910         /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */
911         if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input))
912                 return false;
913         FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder));
914         *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder);
915         return true;
916 }
917
918 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
919 {
920         FLAC__ASSERT(0 != decoder);
921         FLAC__ASSERT(0 != decoder->private_);
922         FLAC__ASSERT(0 != decoder->protected_);
923
924         if(!decoder->private_->internal_reset_hack && decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
925                 return false;
926
927         decoder->private_->samples_decoded = 0;
928         decoder->private_->do_md5_checking = false;
929
930 #if FLAC__HAS_OGG
931         if(decoder->private_->is_ogg)
932                 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect);
933 #endif
934
935         if(!FLAC__bitreader_clear(decoder->private_->input)) {
936                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
937                 return false;
938         }
939         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
940
941         return true;
942 }
943
944 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
945 {
946         FLAC__ASSERT(0 != decoder);
947         FLAC__ASSERT(0 != decoder->private_);
948         FLAC__ASSERT(0 != decoder->protected_);
949
950         if(!FLAC__stream_decoder_flush(decoder)) {
951                 /* above call sets the state for us */
952                 return false;
953         }
954
955 #if FLAC__HAS_OGG
956         /*@@@ could go in !internal_reset_hack block below */
957         if(decoder->private_->is_ogg)
958                 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect);
959 #endif
960
961         /* Rewind if necessary.  If FLAC__stream_decoder_init() is calling us,
962          * (internal_reset_hack) don't try to rewind since we are already at
963          * the beginning of the stream and don't want to fail if the input is
964          * not seekable.
965          */
966         if(!decoder->private_->internal_reset_hack) {
967                 if(decoder->private_->file == stdin)
968                         return false; /* can't rewind stdin, reset fails */
969                 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR)
970                         return false; /* seekable and seek fails, reset fails */
971         }
972         else
973                 decoder->private_->internal_reset_hack = false;
974
975         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
976
977         decoder->private_->has_stream_info = false;
978
979         free(decoder->private_->seek_table.data.seek_table.points);
980         decoder->private_->seek_table.data.seek_table.points = 0;
981         decoder->private_->has_seek_table = false;
982
983         decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
984         /*
985          * This goes in reset() and not flush() because according to the spec, a
986          * fixed-blocksize stream must stay that way through the whole stream.
987          */
988         decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
989
990         /* We initialize the FLAC__MD5Context even though we may never use it.  This
991          * is because md5 checking may be turned on to start and then turned off if
992          * a seek occurs.  So we init the context here and finalize it in
993          * FLAC__stream_decoder_finish() to make sure things are always cleaned up
994          * properly.
995          */
996         FLAC__MD5Init(&decoder->private_->md5context);
997
998         decoder->private_->first_frame_offset = 0;
999         decoder->private_->unparseable_frame_count = 0;
1000
1001         return true;
1002 }
1003
1004 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
1005 {
1006         FLAC__bool got_a_frame;
1007         FLAC__ASSERT(0 != decoder);
1008         FLAC__ASSERT(0 != decoder->protected_);
1009
1010         while(1) {
1011                 switch(decoder->protected_->state) {
1012                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1013                                 if(!find_metadata_(decoder))
1014                                         return false; /* above function sets the status for us */
1015                                 break;
1016                         case FLAC__STREAM_DECODER_READ_METADATA:
1017                                 if(!read_metadata_(decoder))
1018                                         return false; /* above function sets the status for us */
1019                                 else
1020                                         return true;
1021                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1022                                 if(!frame_sync_(decoder))
1023                                         return true; /* above function sets the status for us */
1024                                 break;
1025                         case FLAC__STREAM_DECODER_READ_FRAME:
1026                                 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
1027                                         return false; /* above function sets the status for us */
1028                                 if(got_a_frame)
1029                                         return true; /* above function sets the status for us */
1030                                 break;
1031                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1032                         case FLAC__STREAM_DECODER_ABORTED:
1033                                 return true;
1034                         default:
1035                                 FLAC__ASSERT(0);
1036                                 return false;
1037                 }
1038         }
1039 }
1040
1041 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
1042 {
1043         FLAC__ASSERT(0 != decoder);
1044         FLAC__ASSERT(0 != decoder->protected_);
1045
1046         while(1) {
1047                 switch(decoder->protected_->state) {
1048                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1049                                 if(!find_metadata_(decoder))
1050                                         return false; /* above function sets the status for us */
1051                                 break;
1052                         case FLAC__STREAM_DECODER_READ_METADATA:
1053                                 if(!read_metadata_(decoder))
1054                                         return false; /* above function sets the status for us */
1055                                 break;
1056                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1057                         case FLAC__STREAM_DECODER_READ_FRAME:
1058                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1059                         case FLAC__STREAM_DECODER_ABORTED:
1060                                 return true;
1061                         default:
1062                                 FLAC__ASSERT(0);
1063                                 return false;
1064                 }
1065         }
1066 }
1067
1068 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
1069 {
1070         FLAC__bool dummy;
1071         FLAC__ASSERT(0 != decoder);
1072         FLAC__ASSERT(0 != decoder->protected_);
1073
1074         while(1) {
1075                 switch(decoder->protected_->state) {
1076                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1077                                 if(!find_metadata_(decoder))
1078                                         return false; /* above function sets the status for us */
1079                                 break;
1080                         case FLAC__STREAM_DECODER_READ_METADATA:
1081                                 if(!read_metadata_(decoder))
1082                                         return false; /* above function sets the status for us */
1083                                 break;
1084                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1085                                 if(!frame_sync_(decoder))
1086                                         return true; /* above function sets the status for us */
1087                                 break;
1088                         case FLAC__STREAM_DECODER_READ_FRAME:
1089                                 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true))
1090                                         return false; /* above function sets the status for us */
1091                                 break;
1092                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1093                         case FLAC__STREAM_DECODER_ABORTED:
1094                                 return true;
1095                         default:
1096                                 FLAC__ASSERT(0);
1097                                 return false;
1098                 }
1099         }
1100 }
1101
1102 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder)
1103 {
1104         FLAC__bool got_a_frame;
1105         FLAC__ASSERT(0 != decoder);
1106         FLAC__ASSERT(0 != decoder->protected_);
1107
1108         while(1) {
1109                 switch(decoder->protected_->state) {
1110                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1111                         case FLAC__STREAM_DECODER_READ_METADATA:
1112                                 return false; /* above function sets the status for us */
1113                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1114                                 if(!frame_sync_(decoder))
1115                                         return true; /* above function sets the status for us */
1116                                 break;
1117                         case FLAC__STREAM_DECODER_READ_FRAME:
1118                                 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false))
1119                                         return false; /* above function sets the status for us */
1120                                 if(got_a_frame)
1121                                         return true; /* above function sets the status for us */
1122                                 break;
1123                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1124                         case FLAC__STREAM_DECODER_ABORTED:
1125                                 return true;
1126                         default:
1127                                 FLAC__ASSERT(0);
1128                                 return false;
1129                 }
1130         }
1131 }
1132
1133 FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample)
1134 {
1135         FLAC__uint64 length;
1136
1137         FLAC__ASSERT(0 != decoder);
1138
1139         if(
1140                 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA &&
1141                 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA &&
1142                 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC &&
1143                 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME &&
1144                 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM
1145         )
1146                 return false;
1147
1148         if(0 == decoder->private_->seek_callback)
1149                 return false;
1150
1151         FLAC__ASSERT(decoder->private_->seek_callback);
1152         FLAC__ASSERT(decoder->private_->tell_callback);
1153         FLAC__ASSERT(decoder->private_->length_callback);
1154         FLAC__ASSERT(decoder->private_->eof_callback);
1155
1156         if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder))
1157                 return false;
1158
1159         decoder->private_->is_seeking = true;
1160
1161         /* turn off md5 checking if a seek is attempted */
1162         decoder->private_->do_md5_checking = false;
1163
1164         /* get the file length (currently our algorithm needs to know the length so it's also an error to get FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED) */
1165         if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) {
1166                 decoder->private_->is_seeking = false;
1167                 return false;
1168         }
1169
1170         /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */
1171         if(
1172                 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA ||
1173                 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA
1174         ) {
1175                 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) {
1176                         /* above call sets the state for us */
1177                         decoder->private_->is_seeking = false;
1178                         return false;
1179                 }
1180                 /* check this again in case we didn't know total_samples the first time */
1181                 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) {
1182                         decoder->private_->is_seeking = false;
1183                         return false;
1184                 }
1185         }
1186
1187         {
1188                 const FLAC__bool ok =
1189 #if FLAC__HAS_OGG
1190                         decoder->private_->is_ogg?
1191                         seek_to_absolute_sample_ogg_(decoder, length, sample) :
1192 #endif
1193                         seek_to_absolute_sample_(decoder, length, sample)
1194                 ;
1195                 decoder->private_->is_seeking = false;
1196                 return ok;
1197         }
1198 }
1199
1200 /***********************************************************************
1201  *
1202  * Protected class methods
1203  *
1204  ***********************************************************************/
1205
1206 uint32_t FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
1207 {
1208         FLAC__ASSERT(0 != decoder);
1209         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1210         FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7));
1211         return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8;
1212 }
1213
1214 /***********************************************************************
1215  *
1216  * Private class methods
1217  *
1218  ***********************************************************************/
1219
1220 void set_defaults_(FLAC__StreamDecoder *decoder)
1221 {
1222         decoder->private_->is_ogg = false;
1223         decoder->private_->read_callback = 0;
1224         decoder->private_->seek_callback = 0;
1225         decoder->private_->tell_callback = 0;
1226         decoder->private_->length_callback = 0;
1227         decoder->private_->eof_callback = 0;
1228         decoder->private_->write_callback = 0;
1229         decoder->private_->metadata_callback = 0;
1230         decoder->private_->error_callback = 0;
1231         decoder->private_->client_data = 0;
1232
1233         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
1234         decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
1235         decoder->private_->metadata_filter_ids_count = 0;
1236
1237         decoder->protected_->md5_checking = false;
1238
1239 #if FLAC__HAS_OGG
1240         FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect);
1241 #endif
1242 }
1243
1244 /*
1245  * This will forcibly set stdin to binary mode (for OSes that require it)
1246  */
1247 FILE *get_binary_stdin_(void)
1248 {
1249         /* if something breaks here it is probably due to the presence or
1250          * absence of an underscore before the identifiers 'setmode',
1251          * 'fileno', and/or 'O_BINARY'; check your system header files.
1252          */
1253 #if defined _MSC_VER || defined __MINGW32__
1254         _setmode(_fileno(stdin), _O_BINARY);
1255 #elif defined __EMX__
1256         setmode(fileno(stdin), O_BINARY);
1257 #endif
1258
1259         return stdin;
1260 }
1261
1262 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels)
1263 {
1264         uint32_t i;
1265         FLAC__int32 *tmp;
1266
1267         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
1268                 return true;
1269
1270         /* simply using realloc() is not practical because the number of channels may change mid-stream */
1271
1272         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
1273                 if(0 != decoder->private_->output[i]) {
1274                         free(decoder->private_->output[i]-4);
1275                         decoder->private_->output[i] = 0;
1276                 }
1277                 if(0 != decoder->private_->residual_unaligned[i]) {
1278                         free(decoder->private_->residual_unaligned[i]);
1279                         decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
1280                 }
1281         }
1282
1283         for(i = 0; i < channels; i++) {
1284                 /* WATCHOUT:
1285                  * FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN()
1286                  * require that the output arrays have a buffer of up to 3 zeroes
1287                  * in front (at negative indices) for alignment purposes;
1288                  * we use 4 to keep the data well-aligned.
1289                  */
1290                 tmp = safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/);
1291                 if(tmp == 0) {
1292                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1293                         return false;
1294                 }
1295                 memset(tmp, 0, sizeof(FLAC__int32)*4);
1296                 decoder->private_->output[i] = tmp + 4;
1297
1298                 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) {
1299                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1300                         return false;
1301                 }
1302         }
1303
1304         decoder->private_->output_capacity = size;
1305         decoder->private_->output_channels = channels;
1306
1307         return true;
1308 }
1309
1310 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
1311 {
1312         size_t i;
1313
1314         FLAC__ASSERT(0 != decoder);
1315         FLAC__ASSERT(0 != decoder->private_);
1316
1317         for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
1318                 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
1319                         return true;
1320
1321         return false;
1322 }
1323
1324 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
1325 {
1326         FLAC__uint32 x;
1327         uint32_t i, id;
1328         FLAC__bool first = true;
1329
1330         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1331
1332         for(i = id = 0; i < 4; ) {
1333                 if(decoder->private_->cached) {
1334                         x = (FLAC__uint32)decoder->private_->lookahead;
1335                         decoder->private_->cached = false;
1336                 }
1337                 else {
1338                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1339                                 return false; /* read_callback_ sets the state for us */
1340                 }
1341                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
1342                         first = true;
1343                         i++;
1344                         id = 0;
1345                         continue;
1346                 }
1347
1348                 if(id >= 3)
1349                         return false;
1350
1351                 if(x == ID3V2_TAG_[id]) {
1352                         id++;
1353                         i = 0;
1354                         if(id == 3) {
1355                                 if(!skip_id3v2_tag_(decoder))
1356                                         return false; /* skip_id3v2_tag_ sets the state for us */
1357                         }
1358                         continue;
1359                 }
1360                 id = 0;
1361                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1362                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1363                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1364                                 return false; /* read_callback_ sets the state for us */
1365
1366                         /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
1367                         /* else we have to check if the second byte is the end of a sync code */
1368                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1369                                 decoder->private_->lookahead = (FLAC__byte)x;
1370                                 decoder->private_->cached = true;
1371                         }
1372                         else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
1373                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1374                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1375                                 return true;
1376                         }
1377                 }
1378                 i = 0;
1379                 if(first) {
1380                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1381                         first = false;
1382                 }
1383         }
1384
1385         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
1386         return true;
1387 }
1388
1389 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
1390 {
1391         FLAC__bool is_last;
1392         FLAC__uint32 i, x, type, length;
1393
1394         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1395
1396         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN))
1397                 return false; /* read_callback_ sets the state for us */
1398         is_last = x? true : false;
1399
1400         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN))
1401                 return false; /* read_callback_ sets the state for us */
1402
1403         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN))
1404                 return false; /* read_callback_ sets the state for us */
1405
1406         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
1407                 if(!read_metadata_streaminfo_(decoder, is_last, length))
1408                         return false;
1409
1410                 decoder->private_->has_stream_info = true;
1411                 if(0 == memcmp(decoder->private_->stream_info.data.stream_info.md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16))
1412                         decoder->private_->do_md5_checking = false;
1413                 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback)
1414                         decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
1415         }
1416         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
1417                 /* just in case we already have a seek table, and reading the next one fails: */
1418                 decoder->private_->has_seek_table = false;
1419
1420                 if(!read_metadata_seektable_(decoder, is_last, length))
1421                         return false;
1422
1423                 decoder->private_->has_seek_table = true;
1424                 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback)
1425                         decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
1426         }
1427         else {
1428                 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
1429                 uint32_t real_length = length;
1430                 FLAC__StreamMetadata block;
1431
1432                 memset(&block, 0, sizeof(block));
1433                 block.is_last = is_last;
1434                 block.type = (FLAC__MetadataType)type;
1435                 block.length = length;
1436
1437                 if(type == FLAC__METADATA_TYPE_APPLICATION) {
1438                         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))
1439                                 return false; /* read_callback_ sets the state for us */
1440
1441                         if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */
1442                                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/
1443                                 return false;
1444                         }
1445
1446                         real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
1447
1448                         if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
1449                                 skip_it = !skip_it;
1450                 }
1451
1452                 if(skip_it) {
1453                         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1454                                 return false; /* read_callback_ sets the state for us */
1455                 }
1456                 else {
1457                         FLAC__bool ok = true;
1458                         switch(type) {
1459                                 case FLAC__METADATA_TYPE_PADDING:
1460                                         /* skip the padding bytes */
1461                                         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1462                                                 ok = false; /* read_callback_ sets the state for us */
1463                                         break;
1464                                 case FLAC__METADATA_TYPE_APPLICATION:
1465                                         /* remember, we read the ID already */
1466                                         if(real_length > 0) {
1467                                                 if(0 == (block.data.application.data = malloc(real_length))) {
1468                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1469                                                         ok = false;
1470                                                 }
1471                                                 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length))
1472                                                         ok = false; /* read_callback_ sets the state for us */
1473                                         }
1474                                         else
1475                                                 block.data.application.data = 0;
1476                                         break;
1477                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1478                                         if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment, real_length))
1479                                                 ok = false;
1480                                         break;
1481                                 case FLAC__METADATA_TYPE_CUESHEET:
1482                                         if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
1483                                                 ok = false;
1484                                         break;
1485                                 case FLAC__METADATA_TYPE_PICTURE:
1486                                         if(!read_metadata_picture_(decoder, &block.data.picture))
1487                                                 ok = false;
1488                                         break;
1489                                 case FLAC__METADATA_TYPE_STREAMINFO:
1490                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1491                                         FLAC__ASSERT(0);
1492                                         break;
1493                                 default:
1494                                         if(real_length > 0) {
1495                                                 if(0 == (block.data.unknown.data = malloc(real_length))) {
1496                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1497                                                         ok = false;
1498                                                 }
1499                                                 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length))
1500                                                         ok = false; /* read_callback_ sets the state for us */
1501                                         }
1502                                         else
1503                                                 block.data.unknown.data = 0;
1504                                         break;
1505                         }
1506                         if(ok && !decoder->private_->is_seeking && decoder->private_->metadata_callback)
1507                                 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1508
1509                         /* now we have to free any malloc()ed data in the block */
1510                         switch(type) {
1511                                 case FLAC__METADATA_TYPE_PADDING:
1512                                         break;
1513                                 case FLAC__METADATA_TYPE_APPLICATION:
1514                                         if(0 != block.data.application.data)
1515                                                 free(block.data.application.data);
1516                                         break;
1517                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1518                                         if(0 != block.data.vorbis_comment.vendor_string.entry)
1519                                                 free(block.data.vorbis_comment.vendor_string.entry);
1520                                         if(block.data.vorbis_comment.num_comments > 0)
1521                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1522                                                         if(0 != block.data.vorbis_comment.comments[i].entry)
1523                                                                 free(block.data.vorbis_comment.comments[i].entry);
1524                                         if(0 != block.data.vorbis_comment.comments)
1525                                                 free(block.data.vorbis_comment.comments);
1526                                         break;
1527                                 case FLAC__METADATA_TYPE_CUESHEET:
1528                                         if(block.data.cue_sheet.num_tracks > 0)
1529                                                 for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
1530                                                         if(0 != block.data.cue_sheet.tracks[i].indices)
1531                                                                 free(block.data.cue_sheet.tracks[i].indices);
1532                                         if(0 != block.data.cue_sheet.tracks)
1533                                                 free(block.data.cue_sheet.tracks);
1534                                         break;
1535                                 case FLAC__METADATA_TYPE_PICTURE:
1536                                         if(0 != block.data.picture.mime_type)
1537                                                 free(block.data.picture.mime_type);
1538                                         if(0 != block.data.picture.description)
1539                                                 free(block.data.picture.description);
1540                                         if(0 != block.data.picture.data)
1541                                                 free(block.data.picture.data);
1542                                         break;
1543                                 case FLAC__METADATA_TYPE_STREAMINFO:
1544                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1545                                         FLAC__ASSERT(0);
1546                                 default:
1547                                         if(0 != block.data.unknown.data)
1548                                                 free(block.data.unknown.data);
1549                                         break;
1550                         }
1551
1552                         if(!ok) /* anything that unsets "ok" should also make sure decoder->protected_->state is updated */
1553                                 return false;
1554                 }
1555         }
1556
1557         if(is_last) {
1558                 /* if this fails, it's OK, it's just a hint for the seek routine */
1559                 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset))
1560                         decoder->private_->first_frame_offset = 0;
1561                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1562         }
1563
1564         return true;
1565 }
1566
1567 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length)
1568 {
1569         FLAC__uint32 x;
1570         uint32_t bits, used_bits = 0;
1571
1572         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1573
1574         decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
1575         decoder->private_->stream_info.is_last = is_last;
1576         decoder->private_->stream_info.length = length;
1577
1578         bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
1579         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits))
1580                 return false; /* read_callback_ sets the state for us */
1581         decoder->private_->stream_info.data.stream_info.min_blocksize = x;
1582         used_bits += bits;
1583
1584         bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
1585         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
1586                 return false; /* read_callback_ sets the state for us */
1587         decoder->private_->stream_info.data.stream_info.max_blocksize = x;
1588         used_bits += bits;
1589
1590         bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
1591         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
1592                 return false; /* read_callback_ sets the state for us */
1593         decoder->private_->stream_info.data.stream_info.min_framesize = x;
1594         used_bits += bits;
1595
1596         bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
1597         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
1598                 return false; /* read_callback_ sets the state for us */
1599         decoder->private_->stream_info.data.stream_info.max_framesize = x;
1600         used_bits += bits;
1601
1602         bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
1603         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
1604                 return false; /* read_callback_ sets the state for us */
1605         decoder->private_->stream_info.data.stream_info.sample_rate = x;
1606         used_bits += bits;
1607
1608         bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
1609         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
1610                 return false; /* read_callback_ sets the state for us */
1611         decoder->private_->stream_info.data.stream_info.channels = x+1;
1612         used_bits += bits;
1613
1614         bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
1615         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
1616                 return false; /* read_callback_ sets the state for us */
1617         decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
1618         used_bits += bits;
1619
1620         bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
1621         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN))
1622                 return false; /* read_callback_ sets the state for us */
1623         used_bits += bits;
1624
1625         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16))
1626                 return false; /* read_callback_ sets the state for us */
1627         used_bits += 16*8;
1628
1629         /* skip the rest of the block */
1630         FLAC__ASSERT(used_bits % 8 == 0);
1631         length -= (used_bits / 8);
1632         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1633                 return false; /* read_callback_ sets the state for us */
1634
1635         return true;
1636 }
1637
1638 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length)
1639 {
1640         FLAC__uint32 i, x;
1641         FLAC__uint64 xx;
1642
1643         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1644
1645         decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1646         decoder->private_->seek_table.is_last = is_last;
1647         decoder->private_->seek_table.length = length;
1648
1649         decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1650
1651         /* use realloc since we may pass through here several times (e.g. after seeking) */
1652         if(0 == (decoder->private_->seek_table.data.seek_table.points = safe_realloc_mul_2op_(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint)))) {
1653                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1654                 return false;
1655         }
1656         for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1657                 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN))
1658                         return false; /* read_callback_ sets the state for us */
1659                 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1660
1661                 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN))
1662                         return false; /* read_callback_ sets the state for us */
1663                 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1664
1665                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN))
1666                         return false; /* read_callback_ sets the state for us */
1667                 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1668         }
1669         length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1670         /* if there is a partial point left, skip over it */
1671         if(length > 0) {
1672                 /*@@@ do a send_error_to_client_() here?  there's an argument for either way */
1673                 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1674                         return false; /* read_callback_ sets the state for us */
1675         }
1676
1677         return true;
1678 }
1679
1680 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length)
1681 {
1682         FLAC__uint32 i;
1683
1684         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1685
1686         /* read vendor string */
1687         if (length >= 8) {
1688                 length -= 8; /* vendor string length + num comments entries alone take 8 bytes */
1689                 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1690                 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length))
1691                         return false; /* read_callback_ sets the state for us */
1692                 if (obj->vendor_string.length > 0) {
1693                         if (length < obj->vendor_string.length) {
1694                                 obj->vendor_string.length = 0;
1695                                 obj->vendor_string.entry = 0;
1696                                 goto skip;
1697                         }
1698                         else
1699                                 length -= obj->vendor_string.length;
1700                         if (0 == (obj->vendor_string.entry = safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) {
1701                                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1702                                 return false;
1703                         }
1704                         if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length))
1705                                 return false; /* read_callback_ sets the state for us */
1706                         obj->vendor_string.entry[obj->vendor_string.length] = '\0';
1707                 }
1708                 else
1709                         obj->vendor_string.entry = 0;
1710
1711                 /* read num comments */
1712                 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1713                 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments))
1714                         return false; /* read_callback_ sets the state for us */
1715
1716                 /* read comments */
1717                 if (obj->num_comments > 100000) {
1718                         /* Possibly malicious file. */
1719                         obj->num_comments = 0;
1720                         return false;
1721                 }
1722                 if (obj->num_comments > 0) {
1723                         if (0 == (obj->comments = safe_malloc_mul_2op_p(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1724                                 obj->num_comments = 0;
1725                                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1726                                 return false;
1727                         }
1728                         for (i = 0; i < obj->num_comments; i++) {
1729                                 /* Initialize here just to make sure. */
1730                                 obj->comments[i].length = 0;
1731                                 obj->comments[i].entry = 0;
1732
1733                                 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1734                                 if (length < 4) {
1735                                         obj->num_comments = i;
1736                                         goto skip;
1737                                 }
1738                                 else
1739                                         length -= 4;
1740                                 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length)) {
1741                                         obj->num_comments = i;
1742                                         return false; /* read_callback_ sets the state for us */
1743                                 }
1744                                 if (obj->comments[i].length > 0) {
1745                                         if (length < obj->comments[i].length) {
1746                                                 obj->num_comments = i;
1747                                                 goto skip;
1748                                         }
1749                                         else
1750                                                 length -= obj->comments[i].length;
1751                                         if (0 == (obj->comments[i].entry = safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) {
1752                                                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1753                                                 obj->num_comments = i;
1754                                                 return false;
1755                                         }
1756                                         memset (obj->comments[i].entry, 0, obj->comments[i].length) ;
1757                                         if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length)) {
1758                                                 /* Current i-th entry is bad, so we delete it. */
1759                                                 free (obj->comments[i].entry) ;
1760                                                 obj->comments[i].entry = NULL ;
1761                                                 obj->num_comments = i;
1762                                                 goto skip;
1763                                         }
1764                                         obj->comments[i].entry[obj->comments[i].length] = '\0';
1765                                 }
1766                                 else
1767                                         obj->comments[i].entry = 0;
1768                         }
1769                 }
1770         }
1771
1772   skip:
1773         if (length > 0) {
1774                 /* length > 0 can only happen on files with invalid data in comments */
1775                 if(obj->num_comments < 1) {
1776                         free(obj->comments);
1777                         obj->comments = NULL;
1778                 }
1779                 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1780                         return false; /* read_callback_ sets the state for us */
1781         }
1782
1783         return true;
1784 }
1785
1786 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
1787 {
1788         FLAC__uint32 i, j, x;
1789
1790         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1791
1792         memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
1793
1794         FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1795         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8))
1796                 return false; /* read_callback_ sets the state for us */
1797
1798         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN))
1799                 return false; /* read_callback_ sets the state for us */
1800
1801         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN))
1802                 return false; /* read_callback_ sets the state for us */
1803         obj->is_cd = x? true : false;
1804
1805         if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN))
1806                 return false; /* read_callback_ sets the state for us */
1807
1808         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN))
1809                 return false; /* read_callback_ sets the state for us */
1810         obj->num_tracks = x;
1811
1812         if(obj->num_tracks > 0) {
1813                 if(0 == (obj->tracks = safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
1814                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1815                         return false;
1816                 }
1817                 for(i = 0; i < obj->num_tracks; i++) {
1818                         FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
1819                         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN))
1820                                 return false; /* read_callback_ sets the state for us */
1821
1822                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN))
1823                                 return false; /* read_callback_ sets the state for us */
1824                         track->number = (FLAC__byte)x;
1825
1826                         FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1827                         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8))
1828                                 return false; /* read_callback_ sets the state for us */
1829
1830                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN))
1831                                 return false; /* read_callback_ sets the state for us */
1832                         track->type = x;
1833
1834                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN))
1835                                 return false; /* read_callback_ sets the state for us */
1836                         track->pre_emphasis = x;
1837
1838                         if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN))
1839                                 return false; /* read_callback_ sets the state for us */
1840
1841                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN))
1842                                 return false; /* read_callback_ sets the state for us */
1843                         track->num_indices = (FLAC__byte)x;
1844
1845                         if(track->num_indices > 0) {
1846                                 if(0 == (track->indices = safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
1847                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1848                                         return false;
1849                                 }
1850                                 for(j = 0; j < track->num_indices; j++) {
1851                                         FLAC__StreamMetadata_CueSheet_Index *indx = &track->indices[j];
1852                                         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &indx->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN))
1853                                                 return false; /* read_callback_ sets the state for us */
1854
1855                                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN))
1856                                                 return false; /* read_callback_ sets the state for us */
1857                                         indx->number = (FLAC__byte)x;
1858
1859                                         if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN))
1860                                                 return false; /* read_callback_ sets the state for us */
1861                                 }
1862                         }
1863                 }
1864         }
1865
1866         return true;
1867 }
1868
1869 FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj)
1870 {
1871         FLAC__uint32 x;
1872
1873         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1874
1875         /* read type */
1876         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN))
1877                 return false; /* read_callback_ sets the state for us */
1878         obj->type = x;
1879
1880         /* read MIME type */
1881         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN))
1882                 return false; /* read_callback_ sets the state for us */
1883         if(0 == (obj->mime_type = safe_malloc_add_2op_(x, /*+*/1))) {
1884                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1885                 return false;
1886         }
1887         if(x > 0) {
1888                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x))
1889                         return false; /* read_callback_ sets the state for us */
1890         }
1891         obj->mime_type[x] = '\0';
1892
1893         /* read description */
1894         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN))
1895                 return false; /* read_callback_ sets the state for us */
1896         if(0 == (obj->description = safe_malloc_add_2op_(x, /*+*/1))) {
1897                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1898                 return false;
1899         }
1900         if(x > 0) {
1901                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x))
1902                         return false; /* read_callback_ sets the state for us */
1903         }
1904         obj->description[x] = '\0';
1905
1906         /* read width */
1907         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN))
1908                 return false; /* read_callback_ sets the state for us */
1909
1910         /* read height */
1911         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN))
1912                 return false; /* read_callback_ sets the state for us */
1913
1914         /* read depth */
1915         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN))
1916                 return false; /* read_callback_ sets the state for us */
1917
1918         /* read colors */
1919         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN))
1920                 return false; /* read_callback_ sets the state for us */
1921
1922         /* read data */
1923         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN))
1924                 return false; /* read_callback_ sets the state for us */
1925         if(0 == (obj->data = safe_malloc_(obj->data_length))) {
1926                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1927                 return false;
1928         }
1929         if(obj->data_length > 0) {
1930                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length))
1931                         return false; /* read_callback_ sets the state for us */
1932         }
1933
1934         return true;
1935 }
1936
1937 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1938 {
1939         FLAC__uint32 x;
1940         uint32_t i, skip;
1941
1942         /* skip the version and flags bytes */
1943         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24))
1944                 return false; /* read_callback_ sets the state for us */
1945         /* get the size (in bytes) to skip */
1946         skip = 0;
1947         for(i = 0; i < 4; i++) {
1948                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1949                         return false; /* read_callback_ sets the state for us */
1950                 skip <<= 7;
1951                 skip |= (x & 0x7f);
1952         }
1953         /* skip the rest of the tag */
1954         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip))
1955                 return false; /* read_callback_ sets the state for us */
1956         return true;
1957 }
1958
1959 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1960 {
1961         FLAC__uint32 x;
1962         FLAC__bool first = true;
1963
1964         /* If we know the total number of samples in the stream, stop if we've read that many. */
1965         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1966         if(FLAC__stream_decoder_get_total_samples(decoder) > 0) {
1967                 if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) {
1968                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1969                         return true;
1970                 }
1971         }
1972
1973         /* make sure we're byte aligned */
1974         if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
1975                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
1976                         return false; /* read_callback_ sets the state for us */
1977         }
1978
1979         while(1) {
1980                 if(decoder->private_->cached) {
1981                         x = (FLAC__uint32)decoder->private_->lookahead;
1982                         decoder->private_->cached = false;
1983                 }
1984                 else {
1985                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1986                                 return false; /* read_callback_ sets the state for us */
1987                 }
1988                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1989                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1990                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1991                                 return false; /* read_callback_ sets the state for us */
1992
1993                         /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
1994                         /* else we have to check if the second byte is the end of a sync code */
1995                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1996                                 decoder->private_->lookahead = (FLAC__byte)x;
1997                                 decoder->private_->cached = true;
1998                         }
1999                         else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
2000                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
2001                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
2002                                 return true;
2003                         }
2004                 }
2005                 if(first) {
2006                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2007                         first = false;
2008                 }
2009         }
2010
2011         return true;
2012 }
2013
2014 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode)
2015 {
2016         uint32_t channel;
2017         uint32_t i;
2018         FLAC__int32 mid, side;
2019         uint32_t frame_crc; /* the one we calculate from the input stream */
2020         FLAC__uint32 x;
2021
2022         *got_a_frame = false;
2023
2024         /* init the CRC */
2025         frame_crc = 0;
2026         frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
2027         frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
2028         FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc);
2029
2030         if(!read_frame_header_(decoder))
2031                 return false;
2032         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */
2033                 return true;
2034         if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
2035                 return false;
2036         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2037                 /*
2038                  * first figure the correct bits-per-sample of the subframe
2039                  */
2040                 uint32_t bps = decoder->private_->frame.header.bits_per_sample;
2041                 switch(decoder->private_->frame.header.channel_assignment) {
2042                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2043                                 /* no adjustment needed */
2044                                 break;
2045                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2046                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2047                                 if(channel == 1)
2048                                         bps++;
2049                                 break;
2050                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2051                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2052                                 if(channel == 0)
2053                                         bps++;
2054                                 break;
2055                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2056                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2057                                 if(channel == 1)
2058                                         bps++;
2059                                 break;
2060                         default:
2061                                 FLAC__ASSERT(0);
2062                 }
2063                 /*
2064                  * now read it
2065                  */
2066                 if(!read_subframe_(decoder, channel, bps, do_full_decode))
2067                         return false;
2068                 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2069                         return true;
2070         }
2071         if(!read_zero_padding_(decoder))
2072                 return false;
2073         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption (i.e. "zero bits" were not all zeroes) */
2074                 return true;
2075
2076         /*
2077          * Read the frame CRC-16 from the footer and check
2078          */
2079         frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input);
2080         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN))
2081                 return false; /* read_callback_ sets the state for us */
2082         if(frame_crc == x) {
2083                 if(do_full_decode) {
2084                         /* Undo any special channel coding */
2085                         switch(decoder->private_->frame.header.channel_assignment) {
2086                                 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2087                                         /* do nothing */
2088                                         break;
2089                                 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2090                                         FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2091                                         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2092                                                 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
2093                                         break;
2094                                 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2095                                         FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2096                                         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2097                                                 decoder->private_->output[0][i] += decoder->private_->output[1][i];
2098                                         break;
2099                                 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2100                                         FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2101                                         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2102 #if 1
2103                                                 mid = decoder->private_->output[0][i];
2104                                                 side = decoder->private_->output[1][i];
2105                                                 mid = ((uint32_t) mid) << 1;
2106                                                 mid |= (side & 1); /* i.e. if 'side' is odd... */
2107                                                 decoder->private_->output[0][i] = (mid + side) >> 1;
2108                                                 decoder->private_->output[1][i] = (mid - side) >> 1;
2109 #else
2110                                                 /* OPT: without 'side' temp variable */
2111                                                 mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */
2112                                                 decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1;
2113                                                 decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1;
2114 #endif
2115                                         }
2116                                         break;
2117                                 default:
2118                                         FLAC__ASSERT(0);
2119                                         break;
2120                         }
2121                 }
2122         }
2123         else {
2124                 /* Bad frame, emit error and zero the output signal */
2125                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
2126                 if(do_full_decode) {
2127                         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2128                                 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2129                         }
2130                 }
2131         }
2132
2133         *got_a_frame = true;
2134
2135         /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */
2136         if(decoder->private_->next_fixed_block_size)
2137                 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size;
2138
2139         /* put the latest values into the public section of the decoder instance */
2140         decoder->protected_->channels = decoder->private_->frame.header.channels;
2141         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
2142         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
2143         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
2144         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
2145
2146         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2147         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
2148
2149         /* write it */
2150         if(do_full_decode) {
2151                 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE) {
2152                         decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2153                         return false;
2154                 }
2155         }
2156
2157         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2158         return true;
2159 }
2160
2161 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
2162 {
2163         FLAC__uint32 x;
2164         FLAC__uint64 xx;
2165         uint32_t i, blocksize_hint = 0, sample_rate_hint = 0;
2166         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
2167         uint32_t raw_header_len;
2168         FLAC__bool is_unparseable = false;
2169
2170         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
2171
2172         /* init the raw header with the saved bits from synchronization */
2173         raw_header[0] = decoder->private_->header_warmup[0];
2174         raw_header[1] = decoder->private_->header_warmup[1];
2175         raw_header_len = 2;
2176
2177         /* check to make sure that reserved bit is 0 */
2178         if(raw_header[1] & 0x02) /* MAGIC NUMBER */
2179                 is_unparseable = true;
2180
2181         /*
2182          * Note that along the way as we read the header, we look for a sync
2183          * code inside.  If we find one it would indicate that our original
2184          * sync was bad since there cannot be a sync code in a valid header.
2185          *
2186          * Three kinds of things can go wrong when reading the frame header:
2187          *  1) We may have sync'ed incorrectly and not landed on a frame header.
2188          *     If we don't find a sync code, it can end up looking like we read
2189          *     a valid but unparseable header, until getting to the frame header
2190          *     CRC.  Even then we could get a false positive on the CRC.
2191          *  2) We may have sync'ed correctly but on an unparseable frame (from a
2192          *     future encoder).
2193          *  3) We may be on a damaged frame which appears valid but unparseable.
2194          *
2195          * For all these reasons, we try and read a complete frame header as
2196          * long as it seems valid, even if unparseable, up until the frame
2197          * header CRC.
2198          */
2199
2200         /*
2201          * read in the raw header as bytes so we can CRC it, and parse it on the way
2202          */
2203         for(i = 0; i < 2; i++) {
2204                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2205                         return false; /* read_callback_ sets the state for us */
2206                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2207                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
2208                         decoder->private_->lookahead = (FLAC__byte)x;
2209                         decoder->private_->cached = true;
2210                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2211                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2212                         return true;
2213                 }
2214                 raw_header[raw_header_len++] = (FLAC__byte)x;
2215         }
2216
2217         switch(x = raw_header[2] >> 4) {
2218                 case 0:
2219                         is_unparseable = true;
2220                         break;
2221                 case 1:
2222                         decoder->private_->frame.header.blocksize = 192;
2223                         break;
2224                 case 2:
2225                 case 3:
2226                 case 4:
2227                 case 5:
2228                         decoder->private_->frame.header.blocksize = 576 << (x-2);
2229                         break;
2230                 case 6:
2231                 case 7:
2232                         blocksize_hint = x;
2233                         break;
2234                 case 8:
2235                 case 9:
2236                 case 10:
2237                 case 11:
2238                 case 12:
2239                 case 13:
2240                 case 14:
2241                 case 15:
2242                         decoder->private_->frame.header.blocksize = 256 << (x-8);
2243                         break;
2244                 default:
2245                         FLAC__ASSERT(0);
2246                         break;
2247         }
2248
2249         switch(x = raw_header[2] & 0x0f) {
2250                 case 0:
2251                         if(decoder->private_->has_stream_info)
2252                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
2253                         else
2254                                 is_unparseable = true;
2255                         break;
2256                 case 1:
2257                         decoder->private_->frame.header.sample_rate = 88200;
2258                         break;
2259                 case 2:
2260                         decoder->private_->frame.header.sample_rate = 176400;
2261                         break;
2262                 case 3:
2263                         decoder->private_->frame.header.sample_rate = 192000;
2264                         break;
2265                 case 4:
2266                         decoder->private_->frame.header.sample_rate = 8000;
2267                         break;
2268                 case 5:
2269                         decoder->private_->frame.header.sample_rate = 16000;
2270                         break;
2271                 case 6:
2272                         decoder->private_->frame.header.sample_rate = 22050;
2273                         break;
2274                 case 7:
2275                         decoder->private_->frame.header.sample_rate = 24000;
2276                         break;
2277                 case 8:
2278                         decoder->private_->frame.header.sample_rate = 32000;
2279                         break;
2280                 case 9:
2281                         decoder->private_->frame.header.sample_rate = 44100;
2282                         break;
2283                 case 10:
2284                         decoder->private_->frame.header.sample_rate = 48000;
2285                         break;
2286                 case 11:
2287                         decoder->private_->frame.header.sample_rate = 96000;
2288                         break;
2289                 case 12:
2290                 case 13:
2291                 case 14:
2292                         sample_rate_hint = x;
2293                         break;
2294                 case 15:
2295                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2296                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2297                         return true;
2298                 default:
2299                         FLAC__ASSERT(0);
2300         }
2301
2302         x = (uint32_t)(raw_header[3] >> 4);
2303         if(x & 8) {
2304                 decoder->private_->frame.header.channels = 2;
2305                 switch(x & 7) {
2306                         case 0:
2307                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
2308                                 break;
2309                         case 1:
2310                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
2311                                 break;
2312                         case 2:
2313                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
2314                                 break;
2315                         default:
2316                                 is_unparseable = true;
2317                                 break;
2318                 }
2319         }
2320         else {
2321                 decoder->private_->frame.header.channels = (uint32_t)x + 1;
2322                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
2323         }
2324
2325         switch(x = (uint32_t)(raw_header[3] & 0x0e) >> 1) {
2326                 case 0:
2327                         if(decoder->private_->has_stream_info)
2328                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
2329                         else
2330                                 is_unparseable = true;
2331                         break;
2332                 case 1:
2333                         decoder->private_->frame.header.bits_per_sample = 8;
2334                         break;
2335                 case 2:
2336                         decoder->private_->frame.header.bits_per_sample = 12;
2337                         break;
2338                 case 4:
2339                         decoder->private_->frame.header.bits_per_sample = 16;
2340                         break;
2341                 case 5:
2342                         decoder->private_->frame.header.bits_per_sample = 20;
2343                         break;
2344                 case 6:
2345                         decoder->private_->frame.header.bits_per_sample = 24;
2346                         break;
2347                 case 3:
2348                 case 7:
2349                         is_unparseable = true;
2350                         break;
2351                 default:
2352                         FLAC__ASSERT(0);
2353                         break;
2354         }
2355
2356         /* check to make sure that reserved bit is 0 */
2357         if(raw_header[3] & 0x01) /* MAGIC NUMBER */
2358                 is_unparseable = true;
2359
2360         /* read the frame's starting sample number (or frame number as the case may be) */
2361         if(
2362                 raw_header[1] & 0x01 ||
2363                 /*@@@ this clause is a concession to the old way of doing variable blocksize; the only known implementation is flake and can probably be removed without inconveniencing anyone */
2364                 (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize)
2365         ) { /* variable blocksize */
2366                 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len))
2367                         return false; /* read_callback_ sets the state for us */
2368                 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */
2369                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2370                         decoder->private_->cached = true;
2371                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2372                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2373                         return true;
2374                 }
2375                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2376                 decoder->private_->frame.header.number.sample_number = xx;
2377         }
2378         else { /* fixed blocksize */
2379                 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len))
2380                         return false; /* read_callback_ sets the state for us */
2381                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
2382                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2383                         decoder->private_->cached = true;
2384                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2385                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2386                         return true;
2387                 }
2388                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
2389                 decoder->private_->frame.header.number.frame_number = x;
2390         }
2391
2392         if(blocksize_hint) {
2393                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2394                         return false; /* read_callback_ sets the state for us */
2395                 raw_header[raw_header_len++] = (FLAC__byte)x;
2396                 if(blocksize_hint == 7) {
2397                         FLAC__uint32 _x;
2398                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2399                                 return false; /* read_callback_ sets the state for us */
2400                         raw_header[raw_header_len++] = (FLAC__byte)_x;
2401                         x = (x << 8) | _x;
2402                 }
2403                 decoder->private_->frame.header.blocksize = x+1;
2404         }
2405
2406         if(sample_rate_hint) {
2407                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2408                         return false; /* read_callback_ sets the state for us */
2409                 raw_header[raw_header_len++] = (FLAC__byte)x;
2410                 if(sample_rate_hint != 12) {
2411                         FLAC__uint32 _x;
2412                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2413                                 return false; /* read_callback_ sets the state for us */
2414                         raw_header[raw_header_len++] = (FLAC__byte)_x;
2415                         x = (x << 8) | _x;
2416                 }
2417                 if(sample_rate_hint == 12)
2418                         decoder->private_->frame.header.sample_rate = x*1000;
2419                 else if(sample_rate_hint == 13)
2420                         decoder->private_->frame.header.sample_rate = x;
2421                 else
2422                         decoder->private_->frame.header.sample_rate = x*10;
2423         }
2424
2425         /* read the CRC-8 byte */
2426         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2427                 return false; /* read_callback_ sets the state for us */
2428         crc8 = (FLAC__byte)x;
2429
2430         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
2431                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2432                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2433                 return true;
2434         }
2435
2436         /* calculate the sample number from the frame number if needed */
2437         decoder->private_->next_fixed_block_size = 0;
2438         if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) {
2439                 x = decoder->private_->frame.header.number.frame_number;
2440                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2441                 if(decoder->private_->fixed_block_size)
2442                         decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x;
2443                 else if(decoder->private_->has_stream_info) {
2444                         if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) {
2445                                 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x;
2446                                 decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize;
2447                         }
2448                         else
2449                                 is_unparseable = true;
2450                 }
2451                 else if(x == 0) {
2452                         decoder->private_->frame.header.number.sample_number = 0;
2453                         decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize;
2454                 }
2455                 else {
2456                         /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */
2457                         decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x;
2458                 }
2459         }
2460
2461         if(is_unparseable) {
2462                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2463                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2464                 return true;
2465         }
2466
2467         return true;
2468 }
2469
2470 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2471 {
2472         FLAC__uint32 x;
2473         FLAC__bool wasted_bits;
2474         uint32_t i;
2475
2476         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */
2477                 return false; /* read_callback_ sets the state for us */
2478
2479         wasted_bits = (x & 1);
2480         x &= 0xfe;
2481
2482         if(wasted_bits) {
2483                 uint32_t u;
2484                 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u))
2485                         return false; /* read_callback_ sets the state for us */
2486                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
2487                 if (decoder->private_->frame.subframes[channel].wasted_bits >= bps)
2488                         return false;
2489                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
2490         }
2491         else
2492                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
2493
2494         /*
2495          * Lots of magic numbers here
2496          */
2497         if(x & 0x80) {
2498                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2499                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2500                 return true;
2501         }
2502         else if(x == 0) {
2503                 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode))
2504                         return false;
2505         }
2506         else if(x == 2) {
2507                 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode))
2508                         return false;
2509         }
2510         else if(x < 16) {
2511                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2512                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2513                 return true;
2514         }
2515         else if(x <= 24) {
2516                 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode))
2517                         return false;
2518                 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2519                         return true;
2520         }
2521         else if(x < 64) {
2522                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2523                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2524                 return true;
2525         }
2526         else {
2527                 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode))
2528                         return false;
2529                 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2530                         return true;
2531         }
2532
2533         if(wasted_bits && do_full_decode) {
2534                 x = decoder->private_->frame.subframes[channel].wasted_bits;
2535                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2536                         uint32_t val = decoder->private_->output[channel][i];
2537                         decoder->private_->output[channel][i] = (val << x);
2538                 }
2539         }
2540
2541         return true;
2542 }
2543
2544 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2545 {
2546         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
2547         FLAC__int32 x;
2548         uint32_t i;
2549         FLAC__int32 *output = decoder->private_->output[channel];
2550
2551         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
2552
2553         if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2554                 return false; /* read_callback_ sets the state for us */
2555
2556         subframe->value = x;
2557
2558         /* decode the subframe */
2559         if(do_full_decode) {
2560                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2561                         output[i] = x;
2562         }
2563
2564         return true;
2565 }
2566
2567 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode)
2568 {
2569         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
2570         FLAC__int32 i32;
2571         FLAC__uint32 u32;
2572         uint32_t u;
2573
2574         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
2575
2576         subframe->residual = decoder->private_->residual[channel];
2577         subframe->order = order;
2578
2579         /* read warm-up samples */
2580         for(u = 0; u < order; u++) {
2581                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2582                         return false; /* read_callback_ sets the state for us */
2583                 subframe->warmup[u] = i32;
2584         }
2585
2586         /* read entropy coding method info */
2587         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2588                 return false; /* read_callback_ sets the state for us */
2589         subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2590         switch(subframe->entropy_coding_method.type) {
2591                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2592                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2593                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2594                                 return false; /* read_callback_ sets the state for us */
2595                         if(decoder->private_->frame.header.blocksize >> u32 < order) {
2596                                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2597                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2598                                 return true;
2599                         }
2600                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2601                         subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2602                         break;
2603                 default:
2604                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2605                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2606                         return true;
2607         }
2608
2609         /* read residual */
2610         switch(subframe->entropy_coding_method.type) {
2611                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2612                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2613                         if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
2614                                 return false;
2615                         break;
2616                 default:
2617                         FLAC__ASSERT(0);
2618         }
2619
2620         /* decode the subframe */
2621         if(do_full_decode) {
2622                 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2623                 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
2624         }
2625
2626         return true;
2627 }
2628
2629 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode)
2630 {
2631         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
2632         FLAC__int32 i32;
2633         FLAC__uint32 u32;
2634         uint32_t u;
2635
2636         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
2637
2638         subframe->residual = decoder->private_->residual[channel];
2639         subframe->order = order;
2640
2641         /* read warm-up samples */
2642         for(u = 0; u < order; u++) {
2643                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2644                         return false; /* read_callback_ sets the state for us */
2645                 subframe->warmup[u] = i32;
2646         }
2647
2648         /* read qlp coeff precision */
2649         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
2650                 return false; /* read_callback_ sets the state for us */
2651         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
2652                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2653                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2654                 return true;
2655         }
2656         subframe->qlp_coeff_precision = u32+1;
2657
2658         /* read qlp shift */
2659         if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
2660                 return false; /* read_callback_ sets the state for us */
2661         if(i32 < 0) {
2662                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2663                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2664                 return true;
2665         }
2666         subframe->quantization_level = i32;
2667
2668         /* read quantized lp coefficiencts */
2669         for(u = 0; u < order; u++) {
2670                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision))
2671                         return false; /* read_callback_ sets the state for us */
2672                 subframe->qlp_coeff[u] = i32;
2673         }
2674
2675         /* read entropy coding method info */
2676         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2677                 return false; /* read_callback_ sets the state for us */
2678         subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2679         switch(subframe->entropy_coding_method.type) {
2680                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2681                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2682                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2683                                 return false; /* read_callback_ sets the state for us */
2684                         if(decoder->private_->frame.header.blocksize >> u32 < order) {
2685                                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2686                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2687                                 return true;
2688                         }
2689                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2690                         subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2691                         break;
2692                 default:
2693                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2694                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2695                         return true;
2696         }
2697
2698         /* read residual */
2699         switch(subframe->entropy_coding_method.type) {
2700                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2701                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2702                         if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
2703                                 return false;
2704                         break;
2705                 default:
2706                         FLAC__ASSERT(0);
2707         }
2708
2709         /* decode the subframe */
2710         if(do_full_decode) {
2711                 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2712                 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
2713                         if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
2714                                 decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2715                         else
2716                                 decoder->private_->local_lpc_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2717                 else
2718                         decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2719         }
2720
2721         return true;
2722 }
2723
2724 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2725 {
2726         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
2727         FLAC__int32 x, *residual = decoder->private_->residual[channel];
2728         uint32_t i;
2729
2730         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
2731
2732         subframe->data = residual;
2733
2734         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2735                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2736                         return false; /* read_callback_ sets the state for us */
2737                 residual[i] = x;
2738         }
2739
2740         /* decode the subframe */
2741         if(do_full_decode)
2742                 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2743
2744         return true;
2745 }
2746
2747 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended)
2748 {
2749         FLAC__uint32 rice_parameter;
2750         int i;
2751         uint32_t partition, sample, u;
2752         const uint32_t partitions = 1u << partition_order;
2753         const uint32_t partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
2754         const uint32_t plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2755         const uint32_t pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2756
2757         /* invalid predictor and partition orders mush be handled in the callers */
2758         FLAC__ASSERT(partition_order > 0? partition_samples >= predictor_order : decoder->private_->frame.header.blocksize >= predictor_order);
2759
2760         if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, flac_max(6u, partition_order))) {
2761                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
2762                 return false;
2763         }
2764
2765         sample = 0;
2766         for(partition = 0; partition < partitions; partition++) {
2767                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen))
2768                         return false; /* read_callback_ sets the state for us */
2769                 partitioned_rice_contents->parameters[partition] = rice_parameter;
2770                 if(rice_parameter < pesc) {
2771                         partitioned_rice_contents->raw_bits[partition] = 0;
2772                         u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
2773                         if(!FLAC__bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter))
2774                                 return false; /* read_callback_ sets the state for us */
2775                         sample += u;
2776                 }
2777                 else {
2778                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
2779                                 return false; /* read_callback_ sets the state for us */
2780                         partitioned_rice_contents->raw_bits[partition] = rice_parameter;
2781                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
2782                                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter))
2783                                         return false; /* read_callback_ sets the state for us */
2784                                 residual[sample] = i;
2785                         }
2786                 }
2787         }
2788
2789         return true;
2790 }
2791
2792 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
2793 {
2794         if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
2795                 FLAC__uint32 zero = 0;
2796                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
2797                         return false; /* read_callback_ sets the state for us */
2798                 if(zero != 0) {
2799                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2800                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2801                 }
2802         }
2803         return true;
2804 }
2805
2806 FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data)
2807 {
2808         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
2809
2810         if(
2811 #if FLAC__HAS_OGG
2812                 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2813                 !decoder->private_->is_ogg &&
2814 #endif
2815                 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2816         ) {
2817                 *bytes = 0;
2818                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2819                 return false;
2820         }
2821         else if(*bytes > 0) {
2822                 /* While seeking, it is possible for our seek to land in the
2823                  * middle of audio data that looks exactly like a frame header
2824                  * from a future version of an encoder.  When that happens, our
2825                  * error callback will get an
2826                  * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its
2827                  * unparseable_frame_count.  But there is a remote possibility
2828                  * that it is properly synced at such a "future-codec frame",
2829                  * so to make sure, we wait to see many "unparseable" errors in
2830                  * a row before bailing out.
2831                  */
2832                 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) {
2833                         decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2834                         return false;
2835                 }
2836                 else {
2837                         const FLAC__StreamDecoderReadStatus status =
2838 #if FLAC__HAS_OGG
2839                                 decoder->private_->is_ogg?
2840                                 read_callback_ogg_aspect_(decoder, buffer, bytes) :
2841 #endif
2842                                 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data)
2843                         ;
2844                         if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) {
2845                                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2846                                 return false;
2847                         }
2848                         else if(*bytes == 0) {
2849                                 if(
2850                                         status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM ||
2851                                         (
2852 #if FLAC__HAS_OGG
2853                                                 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2854                                                 !decoder->private_->is_ogg &&
2855 #endif
2856                                                 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2857                                         )
2858                                 ) {
2859                                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2860                                         return false;
2861                                 }
2862                                 else
2863                                         return true;
2864                         }
2865                         else
2866                                 return true;
2867                 }
2868         }
2869         else {
2870                 /* abort to avoid a deadlock */
2871                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2872                 return false;
2873         }
2874         /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around
2875          * for Ogg FLAC.  This is because the ogg decoder aspect can lose sync
2876          * and at the same time hit the end of the stream (for example, seeking
2877          * to a point that is after the beginning of the last Ogg page).  There
2878          * is no way to report an Ogg sync loss through the callbacks (see note
2879          * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0.
2880          * So to keep the decoder from stopping at this point we gate the call
2881          * to the eof_callback and let the Ogg decoder aspect set the
2882          * end-of-stream state when it is needed.
2883          */
2884 }
2885
2886 #if FLAC__HAS_OGG
2887 FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes)
2888 {
2889         switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) {
2890                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK:
2891                         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2892                 /* we don't really have a way to handle lost sync via read
2893                  * callback so we'll let it pass and let the underlying
2894                  * FLAC decoder catch the error
2895                  */
2896                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC:
2897                         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2898                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM:
2899                         return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
2900                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC:
2901                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION:
2902                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT:
2903                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR:
2904                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR:
2905                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2906                 default:
2907                         FLAC__ASSERT(0);
2908                         /* double protection */
2909                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2910         }
2911 }
2912
2913 FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
2914 {
2915         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder;
2916
2917         switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) {
2918                 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE:
2919                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK;
2920                 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM:
2921                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM;
2922                 case FLAC__STREAM_DECODER_READ_STATUS_ABORT:
2923                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2924                 default:
2925                         /* double protection: */
2926                         FLAC__ASSERT(0);
2927                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2928         }
2929 }
2930 #endif
2931
2932 FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[])
2933 {
2934         if(decoder->private_->is_seeking) {
2935                 FLAC__uint64 this_frame_sample = frame->header.number.sample_number;
2936                 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize;
2937                 FLAC__uint64 target_sample = decoder->private_->target_sample;
2938
2939                 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2940
2941 #if FLAC__HAS_OGG
2942                 decoder->private_->got_a_frame = true;
2943 #endif
2944                 decoder->private_->last_frame = *frame; /* save the frame */
2945                 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */
2946                         uint32_t delta = (uint32_t)(target_sample - this_frame_sample);
2947                         /* kick out of seek mode */
2948                         decoder->private_->is_seeking = false;
2949                         /* shift out the samples before target_sample */
2950                         if(delta > 0) {
2951                                 uint32_t channel;
2952                                 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS];
2953                                 for(channel = 0; channel < frame->header.channels; channel++)
2954                                         newbuffer[channel] = buffer[channel] + delta;
2955                                 decoder->private_->last_frame.header.blocksize -= delta;
2956                                 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta;
2957                                 /* write the relevant samples */
2958                                 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data);
2959                         }
2960                         else {
2961                                 /* write the relevant samples */
2962                                 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2963                         }
2964                 }
2965                 else {
2966                         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
2967                 }
2968         }
2969         else {
2970                 /*
2971                  * If we never got STREAMINFO, turn off MD5 checking to save
2972                  * cycles since we don't have a sum to compare to anyway
2973                  */
2974                 if(!decoder->private_->has_stream_info)
2975                         decoder->private_->do_md5_checking = false;
2976                 if(decoder->private_->do_md5_checking) {
2977                         if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8))
2978                                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
2979                 }
2980                 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2981         }
2982 }
2983
2984 void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status)
2985 {
2986         if(!decoder->private_->is_seeking)
2987                 decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
2988         else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM)
2989                 decoder->private_->unparseable_frame_count++;
2990 }
2991
2992 FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
2993 {
2994         FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample;
2995         FLAC__int64 pos = -1;
2996         int i;
2997         uint32_t approx_bytes_per_frame;
2998         FLAC__bool first_seek = true;
2999         const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder);
3000         const uint32_t min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
3001         const uint32_t max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize;
3002         const uint32_t max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize;
3003         const uint32_t min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize;
3004         /* take these from the current frame in case they've changed mid-stream */
3005         uint32_t channels = FLAC__stream_decoder_get_channels(decoder);
3006         uint32_t bps = FLAC__stream_decoder_get_bits_per_sample(decoder);
3007         const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0;
3008
3009         /* use values from stream info if we didn't decode a frame */
3010         if(channels == 0)
3011                 channels = decoder->private_->stream_info.data.stream_info.channels;
3012         if(bps == 0)
3013                 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample;
3014
3015         /* we are just guessing here */
3016         if(max_framesize > 0)
3017                 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1;
3018         /*
3019          * Check if it's a known fixed-blocksize stream.  Note that though
3020          * the spec doesn't allow zeroes in the STREAMINFO block, we may
3021          * never get a STREAMINFO block when decoding so the value of
3022          * min_blocksize might be zero.
3023          */
3024         else if(min_blocksize == max_blocksize && min_blocksize > 0) {
3025                 /* note there are no () around 'bps/8' to keep precision up since it's an integer calculation */
3026                 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
3027         }
3028         else
3029                 approx_bytes_per_frame = 4096 * channels * bps/8 + 64;
3030
3031         /*
3032          * First, we set an upper and lower bound on where in the
3033          * stream we will search.  For now we assume the worst case
3034          * scenario, which is our best guess at the beginning of
3035          * the first frame and end of the stream.
3036          */
3037         lower_bound = first_frame_offset;
3038         lower_bound_sample = 0;
3039         upper_bound = stream_length;
3040         upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/;
3041
3042         /*
3043          * Now we refine the bounds if we have a seektable with
3044          * suitable points.  Note that according to the spec they
3045          * must be ordered by ascending sample number.
3046          *
3047          * Note: to protect against invalid seek tables we will ignore points
3048          * that have frame_samples==0 or sample_number>=total_samples
3049          */
3050         if(seek_table) {
3051                 FLAC__uint64 new_lower_bound = lower_bound;
3052                 FLAC__uint64 new_upper_bound = upper_bound;
3053                 FLAC__uint64 new_lower_bound_sample = lower_bound_sample;
3054                 FLAC__uint64 new_upper_bound_sample = upper_bound_sample;
3055
3056                 /* find the closest seek point <= target_sample, if it exists */
3057                 for(i = (int)seek_table->num_points - 1; i >= 0; i--) {
3058                         if(
3059                                 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3060                                 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3061                                 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3062                                 seek_table->points[i].sample_number <= target_sample
3063                         )
3064                                 break;
3065                 }
3066