libFLAC/cpu.c: Get rid of OS_IS_ANDROID function
[flac.git] / src / libFLAC / ogg_helper.c
1 /* libFLAC - Free Lossless Audio Codec
2  * Copyright (C) 2004-2009  Josh Coalson
3  * Copyright (C) 2011-2014  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 <stdlib.h> /* for malloc() */
38 #include <string.h> /* for memcmp(), memcpy() */
39 #include "FLAC/assert.h"
40 #include "share/alloc.h"
41 #include "private/ogg_helper.h"
42 #include "protected/stream_encoder.h"
43
44
45 static FLAC__bool full_read_(FLAC__StreamEncoder *encoder, FLAC__byte *buffer, size_t bytes, FLAC__StreamEncoderReadCallback read_callback, void *client_data)
46 {
47         while(bytes > 0) {
48                 size_t bytes_read = bytes;
49                 switch(read_callback(encoder, buffer, &bytes_read, client_data)) {
50                         case FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE:
51                                 bytes -= bytes_read;
52                                 buffer += bytes_read;
53                                 break;
54                         case FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM:
55                                 if(bytes_read == 0) {
56                                         encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
57                                         return false;
58                                 }
59                                 bytes -= bytes_read;
60                                 buffer += bytes_read;
61                                 break;
62                         case FLAC__STREAM_ENCODER_READ_STATUS_ABORT:
63                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
64                                 return false;
65                         case FLAC__STREAM_ENCODER_READ_STATUS_UNSUPPORTED:
66                                 return false;
67                         default:
68                                 /* double protection: */
69                                 FLAC__ASSERT(0);
70                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
71                                 return false;
72                 }
73         }
74
75         return true;
76 }
77
78 void simple_ogg_page__init(ogg_page *page)
79 {
80         page->header = 0;
81         page->header_len = 0;
82         page->body = 0;
83         page->body_len = 0;
84 }
85
86 void simple_ogg_page__clear(ogg_page *page)
87 {
88         if(page->header)
89                 free(page->header);
90         if(page->body)
91                 free(page->body);
92         simple_ogg_page__init(page);
93 }
94
95 FLAC__bool simple_ogg_page__get_at(FLAC__StreamEncoder *encoder, FLAC__uint64 position, ogg_page *page, FLAC__StreamEncoderSeekCallback seek_callback, FLAC__StreamEncoderReadCallback read_callback, void *client_data)
96 {
97         static const unsigned OGG_HEADER_FIXED_PORTION_LEN = 27;
98         static const unsigned OGG_MAX_HEADER_LEN = 27/*OGG_HEADER_FIXED_PORTION_LEN*/ + 255;
99         FLAC__byte crc[4];
100         FLAC__StreamEncoderSeekStatus seek_status;
101
102         FLAC__ASSERT(page->header == 0);
103         FLAC__ASSERT(page->header_len == 0);
104         FLAC__ASSERT(page->body == 0);
105         FLAC__ASSERT(page->body_len == 0);
106
107         /* move the stream pointer to the supposed beginning of the page */
108         if(0 == seek_callback)
109                 return false;
110         if((seek_status = seek_callback((FLAC__StreamEncoder*)encoder, position, client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
111                 if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
112                         encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
113                 return false;
114         }
115
116         /* allocate space for the page header */
117         if(0 == (page->header = safe_malloc_(OGG_MAX_HEADER_LEN))) {
118                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
119                 return false;
120         }
121
122         /* read in the fixed part of the page header (up to but not including
123          * the segment table */
124         if(!full_read_(encoder, page->header, OGG_HEADER_FIXED_PORTION_LEN, read_callback, client_data))
125                 return false;
126
127         page->header_len = OGG_HEADER_FIXED_PORTION_LEN + page->header[26];
128
129         /* check to see if it's a correct, "simple" page (one packet only) */
130         if(
131                 memcmp(page->header, "OggS", 4) ||               /* doesn't start with OggS */
132                 (page->header[5] & 0x01) ||                      /* continued packet */
133                 memcmp(page->header+6, "\0\0\0\0\0\0\0\0", 8) || /* granulepos is non-zero */
134                 page->header[26] == 0                            /* packet is 0-size */
135         ) {
136                 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
137                 return false;
138         }
139
140         /* read in the segment table */
141         if(!full_read_(encoder, page->header + OGG_HEADER_FIXED_PORTION_LEN, page->header[26], read_callback, client_data))
142                 return false;
143
144         {
145                 unsigned i;
146
147                 /* check to see that it specifies a single packet */
148                 for(i = 0; i < (unsigned)page->header[26] - 1; i++) {
149                         if(page->header[i + OGG_HEADER_FIXED_PORTION_LEN] != 255) {
150                                 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
151                                 return false;
152                         }
153                 }
154
155                 page->body_len = 255 * i + page->header[i + OGG_HEADER_FIXED_PORTION_LEN];
156         }
157
158         /* allocate space for the page body */
159         if(0 == (page->body = safe_malloc_(page->body_len))) {
160                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
161                 return false;
162         }
163
164         /* read in the page body */
165         if(!full_read_(encoder, page->body, page->body_len, read_callback, client_data))
166                 return false;
167
168         /* check the CRC */
169         memcpy(crc, page->header+22, 4);
170         ogg_page_checksum_set(page);
171         if(memcmp(crc, page->header+22, 4)) {
172                 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
173                 return false;
174         }
175
176         return true;
177 }
178
179 FLAC__bool simple_ogg_page__set_at(FLAC__StreamEncoder *encoder, FLAC__uint64 position, ogg_page *page, FLAC__StreamEncoderSeekCallback seek_callback, FLAC__StreamEncoderWriteCallback write_callback, void *client_data)
180 {
181         FLAC__StreamEncoderSeekStatus seek_status;
182
183         FLAC__ASSERT(page->header != 0);
184         FLAC__ASSERT(page->header_len != 0);
185         FLAC__ASSERT(page->body != 0);
186         FLAC__ASSERT(page->body_len != 0);
187
188         /* move the stream pointer to the supposed beginning of the page */
189         if(0 == seek_callback)
190                 return false;
191         if((seek_status = seek_callback((FLAC__StreamEncoder*)encoder, position, client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
192                 if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
193                         encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
194                 return false;
195         }
196
197         ogg_page_checksum_set(page);
198
199         /* re-write the page */
200         if(write_callback((FLAC__StreamEncoder*)encoder, page->header, page->header_len, 0, 0, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
201                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
202                 return false;
203         }
204         if(write_callback((FLAC__StreamEncoder*)encoder, page->body, page->body_len, 0, 0, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
205                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
206                 return false;
207         }
208
209         return true;
210 }