ce188d4d |
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 qsort() */ |
39 | #include <string.h> /* for memset() */ |
40 | #include "FLAC/assert.h" |
41 | #include "FLAC/format.h" |
42 | #include "share/alloc.h" |
43 | #include "share/compat.h" |
44 | #include "private/format.h" |
45 | #include "private/macros.h" |
46 | |
47 | /* PACKAGE_VERSION should come from configure */ |
48 | FLAC_API const char *FLAC__VERSION_STRING = PACKAGE_VERSION; |
49 | |
50 | FLAC_API const char *FLAC__VENDOR_STRING = "reference libFLAC " PACKAGE_VERSION " 20170101"; |
51 | |
52 | FLAC_API const FLAC__byte FLAC__STREAM_SYNC_STRING[4] = { 'f','L','a','C' }; |
53 | FLAC_API const unsigned FLAC__STREAM_SYNC = 0x664C6143; |
54 | FLAC_API const unsigned FLAC__STREAM_SYNC_LEN = 32; /* bits */ |
55 | |
56 | FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN = 16; /* bits */ |
57 | FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN = 16; /* bits */ |
58 | FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN = 24; /* bits */ |
59 | FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN = 24; /* bits */ |
60 | FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN = 20; /* bits */ |
61 | FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN = 3; /* bits */ |
62 | FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN = 5; /* bits */ |
63 | FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN = 36; /* bits */ |
64 | FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN = 128; /* bits */ |
65 | |
66 | FLAC_API const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN = 32; /* bits */ |
67 | |
68 | FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN = 64; /* bits */ |
69 | FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN = 64; /* bits */ |
70 | FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN = 16; /* bits */ |
71 | |
72 | FLAC_API const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER = FLAC__U64L(0xffffffffffffffff); |
73 | |
74 | FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN = 32; /* bits */ |
75 | FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN = 32; /* bits */ |
76 | |
77 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN = 64; /* bits */ |
78 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN = 8; /* bits */ |
79 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN = 3*8; /* bits */ |
80 | |
81 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN = 64; /* bits */ |
82 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN = 8; /* bits */ |
83 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN = 12*8; /* bits */ |
84 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN = 1; /* bit */ |
85 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN = 1; /* bit */ |
86 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN = 6+13*8; /* bits */ |
87 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN = 8; /* bits */ |
88 | |
89 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN = 128*8; /* bits */ |
90 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN = 64; /* bits */ |
91 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN = 1; /* bit */ |
92 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN = 7+258*8; /* bits */ |
93 | FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN = 8; /* bits */ |
94 | |
95 | FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_TYPE_LEN = 32; /* bits */ |
96 | FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN = 32; /* bits */ |
97 | FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN = 32; /* bits */ |
98 | FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN = 32; /* bits */ |
99 | FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN = 32; /* bits */ |
100 | FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN = 32; /* bits */ |
101 | FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_COLORS_LEN = 32; /* bits */ |
102 | FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN = 32; /* bits */ |
103 | |
104 | FLAC_API const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN = 1; /* bits */ |
105 | FLAC_API const unsigned FLAC__STREAM_METADATA_TYPE_LEN = 7; /* bits */ |
106 | FLAC_API const unsigned FLAC__STREAM_METADATA_LENGTH_LEN = 24; /* bits */ |
107 | |
108 | FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC = 0x3ffe; |
109 | FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC_LEN = 14; /* bits */ |
110 | FLAC_API const unsigned FLAC__FRAME_HEADER_RESERVED_LEN = 1; /* bits */ |
111 | FLAC_API const unsigned FLAC__FRAME_HEADER_BLOCKING_STRATEGY_LEN = 1; /* bits */ |
112 | FLAC_API const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN = 4; /* bits */ |
113 | FLAC_API const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN = 4; /* bits */ |
114 | FLAC_API const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN = 4; /* bits */ |
115 | FLAC_API const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN = 3; /* bits */ |
116 | FLAC_API const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN = 1; /* bits */ |
117 | FLAC_API const unsigned FLAC__FRAME_HEADER_CRC_LEN = 8; /* bits */ |
118 | |
119 | FLAC_API const unsigned FLAC__FRAME_FOOTER_CRC_LEN = 16; /* bits */ |
120 | |
121 | FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN = 2; /* bits */ |
122 | FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN = 4; /* bits */ |
123 | FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN = 4; /* bits */ |
124 | FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN = 5; /* bits */ |
125 | FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN = 5; /* bits */ |
126 | |
127 | FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER = 15; /* == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */ |
128 | FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER = 31; /* == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN)-1 */ |
129 | |
130 | FLAC_API const char * const FLAC__EntropyCodingMethodTypeString[] = { |
131 | "PARTITIONED_RICE", |
132 | "PARTITIONED_RICE2" |
133 | }; |
134 | |
135 | FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN = 4; /* bits */ |
136 | FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN = 5; /* bits */ |
137 | |
138 | FLAC_API const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN = 1; /* bits */ |
139 | FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LEN = 6; /* bits */ |
140 | FLAC_API const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN = 1; /* bits */ |
141 | |
142 | FLAC_API const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK = 0x00; |
143 | FLAC_API const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK = 0x02; |
144 | FLAC_API const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK = 0x10; |
145 | FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK = 0x40; |
146 | |
147 | FLAC_API const char * const FLAC__SubframeTypeString[] = { |
148 | "CONSTANT", |
149 | "VERBATIM", |
150 | "FIXED", |
151 | "LPC" |
152 | }; |
153 | |
154 | FLAC_API const char * const FLAC__ChannelAssignmentString[] = { |
155 | "INDEPENDENT", |
156 | "LEFT_SIDE", |
157 | "RIGHT_SIDE", |
158 | "MID_SIDE" |
159 | }; |
160 | |
161 | FLAC_API const char * const FLAC__FrameNumberTypeString[] = { |
162 | "FRAME_NUMBER_TYPE_FRAME_NUMBER", |
163 | "FRAME_NUMBER_TYPE_SAMPLE_NUMBER" |
164 | }; |
165 | |
166 | FLAC_API const char * const FLAC__MetadataTypeString[] = { |
167 | "STREAMINFO", |
168 | "PADDING", |
169 | "APPLICATION", |
170 | "SEEKTABLE", |
171 | "VORBIS_COMMENT", |
172 | "CUESHEET", |
173 | "PICTURE" |
174 | }; |
175 | |
176 | FLAC_API const char * const FLAC__StreamMetadata_Picture_TypeString[] = { |
177 | "Other", |
178 | "32x32 pixels 'file icon' (PNG only)", |
179 | "Other file icon", |
180 | "Cover (front)", |
181 | "Cover (back)", |
182 | "Leaflet page", |
183 | "Media (e.g. label side of CD)", |
184 | "Lead artist/lead performer/soloist", |
185 | "Artist/performer", |
186 | "Conductor", |
187 | "Band/Orchestra", |
188 | "Composer", |
189 | "Lyricist/text writer", |
190 | "Recording Location", |
191 | "During recording", |
192 | "During performance", |
193 | "Movie/video screen capture", |
194 | "A bright coloured fish", |
195 | "Illustration", |
196 | "Band/artist logotype", |
197 | "Publisher/Studio logotype" |
198 | }; |
199 | |
200 | FLAC_API FLAC__bool FLAC__format_sample_rate_is_valid(unsigned sample_rate) |
201 | { |
202 | if(sample_rate == 0 || sample_rate > FLAC__MAX_SAMPLE_RATE) { |
203 | return false; |
204 | } |
205 | else |
206 | return true; |
207 | } |
208 | |
209 | FLAC_API FLAC__bool FLAC__format_blocksize_is_subset(unsigned blocksize, unsigned sample_rate) |
210 | { |
211 | if(blocksize > 16384) |
212 | return false; |
213 | else if(sample_rate <= 48000 && blocksize > 4608) |
214 | return false; |
215 | else |
216 | return true; |
217 | } |
218 | |
219 | FLAC_API FLAC__bool FLAC__format_sample_rate_is_subset(unsigned sample_rate) |
220 | { |
221 | if( |
222 | !FLAC__format_sample_rate_is_valid(sample_rate) || |
223 | ( |
224 | sample_rate >= (1u << 16) && |
225 | !(sample_rate % 1000 == 0 || sample_rate % 10 == 0) |
226 | ) |
227 | ) { |
228 | return false; |
229 | } |
230 | else |
231 | return true; |
232 | } |
233 | |
234 | /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */ |
235 | FLAC_API FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *seek_table) |
236 | { |
237 | unsigned i; |
238 | FLAC__uint64 prev_sample_number = 0; |
239 | FLAC__bool got_prev = false; |
240 | |
241 | FLAC__ASSERT(0 != seek_table); |
242 | |
243 | for(i = 0; i < seek_table->num_points; i++) { |
244 | if(got_prev) { |
245 | if( |
246 | seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && |
247 | seek_table->points[i].sample_number <= prev_sample_number |
248 | ) |
249 | return false; |
250 | } |
251 | prev_sample_number = seek_table->points[i].sample_number; |
252 | got_prev = true; |
253 | } |
254 | |
255 | return true; |
256 | } |
257 | |
258 | /* used as the sort predicate for qsort() */ |
259 | static int seekpoint_compare_(const FLAC__StreamMetadata_SeekPoint *l, const FLAC__StreamMetadata_SeekPoint *r) |
260 | { |
261 | /* we don't just 'return l->sample_number - r->sample_number' since the result (FLAC__int64) might overflow an 'int' */ |
262 | if(l->sample_number == r->sample_number) |
263 | return 0; |
264 | else if(l->sample_number < r->sample_number) |
265 | return -1; |
266 | else |
267 | return 1; |
268 | } |
269 | |
270 | /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */ |
271 | FLAC_API unsigned FLAC__format_seektable_sort(FLAC__StreamMetadata_SeekTable *seek_table) |
272 | { |
273 | unsigned i, j; |
274 | FLAC__bool first; |
275 | |
276 | FLAC__ASSERT(0 != seek_table); |
277 | |
278 | if (seek_table->num_points == 0) |
279 | return 0; |
280 | |
281 | /* sort the seekpoints */ |
282 | qsort(seek_table->points, seek_table->num_points, sizeof(FLAC__StreamMetadata_SeekPoint), (int (*)(const void *, const void *))seekpoint_compare_); |
283 | |
284 | /* uniquify the seekpoints */ |
285 | first = true; |
286 | for(i = j = 0; i < seek_table->num_points; i++) { |
287 | if(seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER) { |
288 | if(!first) { |
289 | if(seek_table->points[i].sample_number == seek_table->points[j-1].sample_number) |
290 | continue; |
291 | } |
292 | } |
293 | first = false; |
294 | seek_table->points[j++] = seek_table->points[i]; |
295 | } |
296 | |
297 | for(i = j; i < seek_table->num_points; i++) { |
298 | seek_table->points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER; |
299 | seek_table->points[i].stream_offset = 0; |
300 | seek_table->points[i].frame_samples = 0; |
301 | } |
302 | |
303 | return j; |
304 | } |
305 | |
306 | /* |
307 | * also disallows non-shortest-form encodings, c.f. |
308 | * http://www.unicode.org/versions/corrigendum1.html |
309 | * and a more clear explanation at the end of this section: |
310 | * http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8 |
311 | */ |
312 | static unsigned utf8len_(const FLAC__byte *utf8) |
313 | { |
314 | FLAC__ASSERT(0 != utf8); |
315 | if ((utf8[0] & 0x80) == 0) { |
316 | return 1; |
317 | } |
318 | else if ((utf8[0] & 0xE0) == 0xC0 && (utf8[1] & 0xC0) == 0x80) { |
319 | if ((utf8[0] & 0xFE) == 0xC0) /* overlong sequence check */ |
320 | return 0; |
321 | return 2; |
322 | } |
323 | else if ((utf8[0] & 0xF0) == 0xE0 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80) { |
324 | if (utf8[0] == 0xE0 && (utf8[1] & 0xE0) == 0x80) /* overlong sequence check */ |
325 | return 0; |
326 | /* illegal surrogates check (U+D800...U+DFFF and U+FFFE...U+FFFF) */ |
327 | if (utf8[0] == 0xED && (utf8[1] & 0xE0) == 0xA0) /* D800-DFFF */ |
328 | return 0; |
329 | if (utf8[0] == 0xEF && utf8[1] == 0xBF && (utf8[2] & 0xFE) == 0xBE) /* FFFE-FFFF */ |
330 | return 0; |
331 | return 3; |
332 | } |
333 | else if ((utf8[0] & 0xF8) == 0xF0 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80) { |
334 | if (utf8[0] == 0xF0 && (utf8[1] & 0xF0) == 0x80) /* overlong sequence check */ |
335 | return 0; |
336 | return 4; |
337 | } |
338 | else if ((utf8[0] & 0xFC) == 0xF8 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80 && (utf8[4] & 0xC0) == 0x80) { |
339 | if (utf8[0] == 0xF8 && (utf8[1] & 0xF8) == 0x80) /* overlong sequence check */ |
340 | return 0; |
341 | return 5; |
342 | } |
343 | else if ((utf8[0] & 0xFE) == 0xFC && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80 && (utf8[4] & 0xC0) == 0x80 && (utf8[5] & 0xC0) == 0x80) { |
344 | if (utf8[0] == 0xFC && (utf8[1] & 0xFC) == 0x80) /* overlong sequence check */ |
345 | return 0; |
346 | return 6; |
347 | } |
348 | else { |
349 | return 0; |
350 | } |
351 | } |
352 | |
353 | FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_name_is_legal(const char *name) |
354 | { |
355 | char c; |
356 | for(c = *name; c; c = *(++name)) |
357 | if(c < 0x20 || c == 0x3d || c > 0x7d) |
358 | return false; |
359 | return true; |
360 | } |
361 | |
362 | FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_value_is_legal(const FLAC__byte *value, unsigned length) |
363 | { |
364 | if(length == (unsigned)(-1)) { |
365 | while(*value) { |
366 | unsigned n = utf8len_(value); |
367 | if(n == 0) |
368 | return false; |
369 | value += n; |
370 | } |
371 | } |
372 | else { |
373 | const FLAC__byte *end = value + length; |
374 | while(value < end) { |
375 | unsigned n = utf8len_(value); |
376 | if(n == 0) |
377 | return false; |
378 | value += n; |
379 | } |
380 | if(value != end) |
381 | return false; |
382 | } |
383 | return true; |
384 | } |
385 | |
386 | FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_is_legal(const FLAC__byte *entry, unsigned length) |
387 | { |
388 | const FLAC__byte *s, *end; |
389 | |
390 | for(s = entry, end = s + length; s < end && *s != '='; s++) { |
391 | if(*s < 0x20 || *s > 0x7D) |
392 | return false; |
393 | } |
394 | if(s == end) |
395 | return false; |
396 | |
397 | s++; /* skip '=' */ |
398 | |
399 | while(s < end) { |
400 | unsigned n = utf8len_(s); |
401 | if(n == 0) |
402 | return false; |
403 | s += n; |
404 | } |
405 | if(s != end) |
406 | return false; |
407 | |
408 | return true; |
409 | } |
410 | |
411 | /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */ |
412 | FLAC_API FLAC__bool FLAC__format_cuesheet_is_legal(const FLAC__StreamMetadata_CueSheet *cue_sheet, FLAC__bool check_cd_da_subset, const char **violation) |
413 | { |
414 | unsigned i, j; |
415 | |
416 | if(check_cd_da_subset) { |
417 | if(cue_sheet->lead_in < 2 * 44100) { |
418 | if(violation) *violation = "CD-DA cue sheet must have a lead-in length of at least 2 seconds"; |
419 | return false; |
420 | } |
421 | if(cue_sheet->lead_in % 588 != 0) { |
422 | if(violation) *violation = "CD-DA cue sheet lead-in length must be evenly divisible by 588 samples"; |
423 | return false; |
424 | } |
425 | } |
426 | |
427 | if(cue_sheet->num_tracks == 0) { |
428 | if(violation) *violation = "cue sheet must have at least one track (the lead-out)"; |
429 | return false; |
430 | } |
431 | |
432 | if(check_cd_da_subset && cue_sheet->tracks[cue_sheet->num_tracks-1].number != 170) { |
433 | if(violation) *violation = "CD-DA cue sheet must have a lead-out track number 170 (0xAA)"; |
434 | return false; |
435 | } |
436 | |
437 | for(i = 0; i < cue_sheet->num_tracks; i++) { |
438 | if(cue_sheet->tracks[i].number == 0) { |
439 | if(violation) *violation = "cue sheet may not have a track number 0"; |
440 | return false; |
441 | } |
442 | |
443 | if(check_cd_da_subset) { |
444 | if(!((cue_sheet->tracks[i].number >= 1 && cue_sheet->tracks[i].number <= 99) || cue_sheet->tracks[i].number == 170)) { |
445 | if(violation) *violation = "CD-DA cue sheet track number must be 1-99 or 170"; |
446 | return false; |
447 | } |
448 | } |
449 | |
450 | if(check_cd_da_subset && cue_sheet->tracks[i].offset % 588 != 0) { |
451 | if(violation) { |
452 | if(i == cue_sheet->num_tracks-1) /* the lead-out track... */ |
453 | *violation = "CD-DA cue sheet lead-out offset must be evenly divisible by 588 samples"; |
454 | else |
455 | *violation = "CD-DA cue sheet track offset must be evenly divisible by 588 samples"; |
456 | } |
457 | return false; |
458 | } |
459 | |
460 | if(i < cue_sheet->num_tracks - 1) { |
461 | if(cue_sheet->tracks[i].num_indices == 0) { |
462 | if(violation) *violation = "cue sheet track must have at least one index point"; |
463 | return false; |
464 | } |
465 | |
466 | if(cue_sheet->tracks[i].indices[0].number > 1) { |
467 | if(violation) *violation = "cue sheet track's first index number must be 0 or 1"; |
468 | return false; |
469 | } |
470 | } |
471 | |
472 | for(j = 0; j < cue_sheet->tracks[i].num_indices; j++) { |
473 | if(check_cd_da_subset && cue_sheet->tracks[i].indices[j].offset % 588 != 0) { |
474 | if(violation) *violation = "CD-DA cue sheet track index offset must be evenly divisible by 588 samples"; |
475 | return false; |
476 | } |
477 | |
478 | if(j > 0) { |
479 | if(cue_sheet->tracks[i].indices[j].number != cue_sheet->tracks[i].indices[j-1].number + 1) { |
480 | if(violation) *violation = "cue sheet track index numbers must increase by 1"; |
481 | return false; |
482 | } |
483 | } |
484 | } |
485 | } |
486 | |
487 | return true; |
488 | } |
489 | |
490 | /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */ |
491 | FLAC_API FLAC__bool FLAC__format_picture_is_legal(const FLAC__StreamMetadata_Picture *picture, const char **violation) |
492 | { |
493 | char *p; |
494 | FLAC__byte *b; |
495 | |
496 | for(p = picture->mime_type; *p; p++) { |
497 | if(*p < 0x20 || *p > 0x7e) { |
498 | if(violation) *violation = "MIME type string must contain only printable ASCII characters (0x20-0x7e)"; |
499 | return false; |
500 | } |
501 | } |
502 | |
503 | for(b = picture->description; *b; ) { |
504 | unsigned n = utf8len_(b); |
505 | if(n == 0) { |
506 | if(violation) *violation = "description string must be valid UTF-8"; |
507 | return false; |
508 | } |
509 | b += n; |
510 | } |
511 | |
512 | return true; |
513 | } |
514 | |
515 | /* |
516 | * These routines are private to libFLAC |
517 | */ |
518 | unsigned FLAC__format_get_max_rice_partition_order(unsigned blocksize, unsigned predictor_order) |
519 | { |
520 | return |
521 | FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order( |
522 | FLAC__format_get_max_rice_partition_order_from_blocksize(blocksize), |
523 | blocksize, |
524 | predictor_order |
525 | ); |
526 | } |
527 | |
528 | unsigned FLAC__format_get_max_rice_partition_order_from_blocksize(unsigned blocksize) |
529 | { |
530 | unsigned max_rice_partition_order = 0; |
531 | while(!(blocksize & 1)) { |
532 | max_rice_partition_order++; |
533 | blocksize >>= 1; |
534 | } |
535 | return flac_min(FLAC__MAX_RICE_PARTITION_ORDER, max_rice_partition_order); |
536 | } |
537 | |
538 | unsigned FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(unsigned limit, unsigned blocksize, unsigned predictor_order) |
539 | { |
540 | unsigned max_rice_partition_order = limit; |
541 | |
542 | while(max_rice_partition_order > 0 && (blocksize >> max_rice_partition_order) <= predictor_order) |
543 | max_rice_partition_order--; |
544 | |
545 | FLAC__ASSERT( |
546 | (max_rice_partition_order == 0 && blocksize >= predictor_order) || |
547 | (max_rice_partition_order > 0 && blocksize >> max_rice_partition_order > predictor_order) |
548 | ); |
549 | |
550 | return max_rice_partition_order; |
551 | } |
552 | |
553 | void FLAC__format_entropy_coding_method_partitioned_rice_contents_init(FLAC__EntropyCodingMethod_PartitionedRiceContents *object) |
554 | { |
555 | FLAC__ASSERT(0 != object); |
556 | |
557 | object->parameters = 0; |
558 | object->raw_bits = 0; |
559 | object->capacity_by_order = 0; |
560 | } |
561 | |
562 | void FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(FLAC__EntropyCodingMethod_PartitionedRiceContents *object) |
563 | { |
564 | FLAC__ASSERT(0 != object); |
565 | |
566 | if(0 != object->parameters) |
567 | free(object->parameters); |
568 | if(0 != object->raw_bits) |
569 | free(object->raw_bits); |
570 | FLAC__format_entropy_coding_method_partitioned_rice_contents_init(object); |
571 | } |
572 | |
573 | FLAC__bool FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(FLAC__EntropyCodingMethod_PartitionedRiceContents *object, unsigned max_partition_order) |
574 | { |
575 | FLAC__ASSERT(0 != object); |
576 | |
577 | FLAC__ASSERT(object->capacity_by_order > 0 || (0 == object->parameters && 0 == object->raw_bits)); |
578 | |
579 | if(object->capacity_by_order < max_partition_order) { |
580 | if(0 == (object->parameters = safe_realloc_(object->parameters, sizeof(unsigned)*(1 << max_partition_order)))) |
581 | return false; |
582 | if(0 == (object->raw_bits = safe_realloc_(object->raw_bits, sizeof(unsigned)*(1 << max_partition_order)))) |
583 | return false; |
584 | memset(object->raw_bits, 0, sizeof(unsigned)*(1 << max_partition_order)); |
585 | object->capacity_by_order = max_partition_order; |
586 | } |
587 | |
588 | return true; |
589 | } |