| 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 | } |