src/flac/foreign_metadata.c

   1 /* flac - Command-line FLAC encoder/decoder
   2  * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007,2008,2009  Josh Coalson
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #if HAVE_CONFIG_H
  20 #  include <config.h>
  21 #endif
  22
  23 #include <stdio.h> /* for FILE etc. */
  24 #include <stdlib.h> /* for calloc() etc. */
  25 #include <string.h> /* for memcmp() etc. */
  26 #include "FLAC/assert.h"
  27 #include "FLAC/metadata.h"
  28 #include "share/alloc.h"
  29 #include "share/compat.h"
  30 #include "foreign_metadata.h"
  31
  32 #ifdef min
  33 #undef min
  34 #endif
  35 #define min(x,y) ((x)<(y)?(x):(y))
  36
  37
  38 static const char *FLAC__FOREIGN_METADATA_APPLICATION_ID[3] = { "aiff" , "riff", "w64 " };
  39
  40 static FLAC__uint32 unpack32be_(const FLAC__byte *b)
  41 {
  42         return ((FLAC__uint32)b[0]<<24) + ((FLAC__uint32)b[1]<<16) + ((FLAC__uint32)b[2]<<8) + (FLAC__uint32)b[3];
  43 }
  44
  45 static FLAC__uint32 unpack32le_(const FLAC__byte *b)
  46 {
  47         return (FLAC__uint32)b[0] + ((FLAC__uint32)b[1]<<8) + ((FLAC__uint32)b[2]<<16) + ((FLAC__uint32)b[3]<<24);
  48 }
  49
  50 static FLAC__uint64 unpack64le_(const FLAC__byte *b)
  51 {
  52         return (FLAC__uint64)b[0] + ((FLAC__uint64)b[1]<<8) + ((FLAC__uint64)b[2]<<16) + ((FLAC__uint64)b[3]<<24) + ((FLAC__uint64)b[4]<<32) + ((FLAC__uint64)b[5]<<40) + ((FLAC__uint64)b[6]<<48) + ((FLAC__uint64)b[7]<<56);
  53 }
  54
  55 /* copies 'size' bytes from file 'fin' to 'fout', filling in *error with 'read_error' or 'write_error' as necessary */
  56 static FLAC__bool copy_data_(FILE *fin, FILE *fout, size_t size, const char **error, const char * const read_error, const char * const write_error)
  57 {
  58         FLAC__byte buffer[4096];
  59         size_t left;
  60         for(left = size; left > 0; ) {
  61                 size_t need = min(sizeof(buffer), left);
  62                 if(fread(buffer, 1, need, fin) < need) {
  63                         if(error) *error = read_error;
  64                         return false;
  65                 }
  66                 if(fwrite(buffer, 1, need, fout) < need) {
  67                         if(error) *error = write_error;
  68                         return false;
  69                 }
  70                 left -= need;
  71         }
  72         return true;
  73 }
  74
  75 static FLAC__bool append_block_(foreign_metadata_t *fm, FLAC__off_t offset, FLAC__uint32 size, const char **error)
  76 {
  77         foreign_block_t *fb = safe_realloc_muladd2_(fm->blocks, sizeof(foreign_block_t), /*times (*/fm->num_blocks, /*+*/1/*)*/);
  78         if(fb) {
  79                 fb[fm->num_blocks].offset = offset;
  80                 fb[fm->num_blocks].size = size;
  81                 fm->num_blocks++;
  82                 fm->blocks = fb;
  83                 return true;
  84         }
  85         if(error) *error = "out of memory";
  86         return false;
  87 }
  88
  89 static FLAC__bool read_from_aiff_(foreign_metadata_t *fm, FILE *f, const char **error)
  90 {
  91         FLAC__byte buffer[12];
  92         FLAC__off_t offset, eof_offset;
  93         if((offset = ftello(f)) < 0) {
  94                 if(error) *error = "ftello() error (001)";
  95                 return false;
  96         }
  97         if(fread(buffer, 1, 12, f) < 12 || memcmp(buffer, "FORM", 4) || (memcmp(buffer+8, "AIFF", 4) && memcmp(buffer+8, "AIFC", 4))) {
  98                 if(error) *error = "unsupported FORM layout (002)";
  99                 return false;
 100         }
 101         if(!append_block_(fm, offset, 12, error))
 102                 return false;
 103         eof_offset = (FLAC__off_t)8 + (FLAC__off_t)unpack32be_(buffer+4);
 104         while(!feof(f)) {
 105                 FLAC__uint32 size;
 106                 if((offset = ftello(f)) < 0) {
 107                         if(error) *error = "ftello() error (003)";
 108                         return false;
 109                 }
 110                 if((size = fread(buffer, 1, 8, f)) < 8) {
 111                         if(size == 0 && feof(f))
 112                                 break;
 113                         if(error) *error = "invalid AIFF file (004)";
 114                         return false;
 115                 }
 116                 size = unpack32be_(buffer+4);
 117                 /* check if pad byte needed */
 118                 if(size & 1)
 119                         size++;
 120                 if(!memcmp(buffer, "COMM", 4)) {
 121                         if(fm->format_block) {
 122                                 if(error) *error = "invalid AIFF file: multiple \"COMM\" chunks (005)";
 123                                 return false;
 124                         }
 125                         if(fm->audio_block) {
 126                                 if(error) *error = "invalid AIFF file: \"SSND\" chunk before \"COMM\" chunk (006)";
 127                                 return false;
 128                         }
 129                         fm->format_block = fm->num_blocks;
 130                 }
 131                 else if(!memcmp(buffer, "SSND", 4)) {
 132                         if(fm->audio_block) {
 133                                 if(error) *error = "invalid AIFF file: multiple \"SSND\" chunks (007)";
 134                                 return false;
 135                         }
 136                         if(!fm->format_block) {
 137                                 if(error) *error = "invalid AIFF file: \"SSND\" chunk before \"COMM\" chunk (008)";
 138                                 return false;
 139                         }
 140                         fm->audio_block = fm->num_blocks;
 141                         /* read #offset bytes */
 142                         if(fread(buffer+8, 1, 4, f) < 4) {
 143                                 if(error) *error = "invalid AIFF file (009)";
 144                                 return false;
 145                         }
 146                         fm->ssnd_offset_size = unpack32be_(buffer+8);
 147                         if(fseeko(f, -4, SEEK_CUR) < 0) {
 148                                 if(error) *error = "invalid AIFF file: seek error (010)";
 149                                 return false;
 150                         }
 151                         /* WATCHOUT: For SSND we ignore the blockSize and are not saving any
 152                          * unaligned part at the end of the chunk.  In retrospect it is pretty
 153                          * pointless to save the unaligned data before the PCM but now it is
 154                          * done and cast in stone.
 155                          */
 156                 }
 157                 if(!append_block_(fm, offset, 8 + (memcmp(buffer, "SSND", 4)? size : 8 + fm->ssnd_offset_size), error))
 158                         return false;
 159                 /* skip to next chunk */
 160                 if(fseeko(f, size, SEEK_CUR) < 0) {
 161                         if(error) *error = "invalid AIFF file: seek error (011)";
 162                         return false;
 163                 }
 164         }
 165         if(eof_offset != ftello(f)) {
 166                 if(error) *error = "invalid AIFF file: unexpected EOF (012)";
 167                 return false;
 168         }
 169         if(!fm->format_block) {
 170                 if(error) *error = "invalid AIFF file: missing \"COMM\" chunk (013)";
 171                 return false;
 172         }
 173         if(!fm->audio_block) {
 174                 if(error) *error = "invalid AIFF file: missing \"SSND\" chunk (014)";
 175                 return false;
 176         }
 177         return true;
 178 }
 179
 180 static FLAC__bool read_from_wave_(foreign_metadata_t *fm, FILE *f, const char **error)
 181 {
 182         FLAC__byte buffer[12];
 183         FLAC__off_t offset, eof_offset = -1, ds64_data_size = -1;
 184         if((offset = ftello(f)) < 0) {
 185                 if(error) *error = "ftello() error (001)";
 186                 return false;
 187         }
 188         if(fread(buffer, 1, 12, f) < 12 || (memcmp(buffer, "RIFF", 4) && memcmp(buffer, "RF64", 4)) || memcmp(buffer+8, "WAVE", 4)) {
 189                 if(error) *error = "unsupported RIFF layout (002)";
 190                 return false;
 191         }
 192         if(!memcmp(buffer, "RF64", 4))
 193                 fm->is_rf64 = true;
 194         if(fm->is_rf64 && sizeof(FLAC__off_t) < 8) {
 195                 if(error) *error = "RF64 is not supported on this compile (r00)";
 196                 return false;
 197         }
 198         if(!append_block_(fm, offset, 12, error))
 199                 return false;
 200         if(!fm->is_rf64 || unpack32le_(buffer+4) != 0xffffffffu)
 201                 eof_offset = (FLAC__off_t)8 + (FLAC__off_t)unpack32le_(buffer+4);
 202         while(!feof(f)) {
 203                 FLAC__uint32 size;
 204                 if((offset = ftello(f)) < 0) {
 205                         if(error) *error = "ftello() error (003)";
 206                         return false;
 207                 }
 208                 if((size = fread(buffer, 1, 8, f)) < 8) {
 209                         if(size == 0 && feof(f))
 210                                 break;
 211                         if(error) *error = "invalid WAVE file (004)";
 212                         return false;
 213                 }
 214                 size = unpack32le_(buffer+4);
 215                 /* check if pad byte needed */
 216                 if(size & 1)
 217                         size++;
 218                 if(!memcmp(buffer, "fmt ", 4)) {
 219                         if(fm->format_block) {
 220                                 if(error) *error = "invalid WAVE file: multiple \"fmt \" chunks (005)";
 221                                 return false;
 222                         }
 223                         if(fm->audio_block) {
 224                                 if(error) *error = "invalid WAVE file: \"data\" chunk before \"fmt \" chunk (006)";
 225                                 return false;
 226                         }
 227                         fm->format_block = fm->num_blocks;
 228                 }
 229                 else if(!memcmp(buffer, "data", 4)) {
 230                         if(fm->audio_block) {
 231                                 if(error) *error = "invalid WAVE file: multiple \"data\" chunks (007)";
 232                                 return false;
 233                         }
 234                         if(!fm->format_block) {
 235                                 if(error) *error = "invalid WAVE file: \"data\" chunk before \"fmt \" chunk (008)";
 236                                 return false;
 237                         }
 238                         fm->audio_block = fm->num_blocks;
 239                         if(fm->is_rf64 && fm->num_blocks < 2) {
 240                                 if(error) *error = "invalid RF64 file: \"data\" chunk before \"ds64\" chunk (r01)";
 241                                 return false;
 242                         }
 243                 }
 244                 if(!append_block_(fm, offset, 8 + (memcmp(buffer, "data", 4)? size : 0), error))
 245                         return false;
 246                 /* parse ds64 chunk if necessary */
 247                 if(fm->is_rf64 && fm->num_blocks == 2) {
 248                         FLAC__byte buffer2[7*4];
 249                         if(memcmp(buffer, "ds64", 4)) {
 250                                 if(error) *error = "invalid RF64 file: \"ds64\" chunk does not immediately follow \"WAVE\" marker (r02)";
 251                                 return false;
 252                         }
 253                         /* unpack the size again since we don't want the padding byte effect */
 254                         size = unpack32le_(buffer+4);
 255                         if(size < sizeof(buffer2)) {
 256                                 if(error) *error = "invalid RF64 file: \"ds64\" chunk size is < 28 (r03)";
 257                                 return false;
 258                         }
 259                         if(size > sizeof(buffer2)) {
 260                                 if(error) *error = "RF64 file has \"ds64\" chunk with extra size table, which is not currently supported (r04)";
 261                                 return false;
 262                         }
 263                         if(fread(buffer2, 1, sizeof(buffer2), f) < sizeof(buffer2)) {
 264                                 if(error) *error = "unexpected EOF reading \"ds64\" chunk data in RF64 file (r05)";
 265                                 return false;
 266                         }
 267                         ds64_data_size = (FLAC__off_t)unpack64le_(buffer2+8);
 268                         if(ds64_data_size == (FLAC__off_t)(-1)) {
 269                                 if(error) *error = "RF64 file has \"ds64\" chunk with data size == -1 (r08)";
 270                                 return false;
 271                         }
 272                         /* check if pad byte needed */
 273                         if(ds64_data_size & 1)
 274                                 ds64_data_size++;
 275                         /* @@@ [2^63 limit] */
 276                         if(ds64_data_size < 0) {
 277                                 if(error) *error = "RF64 file too large (r09)";
 278                                 return false;
 279                         }
 280                         if(unpack32le_(buffer2+24)) {
 281                                 if(error) *error = "RF64 file has \"ds64\" chunk with extra size table, which is not currently supported (r06)";
 282                                 return false;
 283                         }
 284                         eof_offset = (FLAC__off_t)8 + (FLAC__off_t)unpack64le_(buffer2);
 285                         /* @@@ [2^63 limit] */
 286                         if((FLAC__off_t)unpack64le_(buffer2) < 0 || eof_offset < 0) {
 287                                 if(error) *error = "RF64 file too large (r07)";
 288                                 return false;
 289                         }
 290                 }
 291                 else { /* skip to next chunk */
 292                         if(fm->is_rf64 && !memcmp(buffer, "data", 4) && unpack32le_(buffer+4) == 0xffffffffu) {
 293                                 if(fseeko(f, ds64_data_size, SEEK_CUR) < 0) {
 294                                         if(error) *error = "invalid RF64 file: seek error (r10)";
 295                                         return false;
 296                                 }
 297                         }
 298                         else {
 299                                 if(fseeko(f, size, SEEK_CUR) < 0) {
 300                                         if(error) *error = "invalid WAVE file: seek error (009)";
 301                                         return false;
 302                                 }
 303                         }
 304                 }
 305         }
 306         if(fm->is_rf64 && eof_offset == (FLAC__off_t)(-1)) {
 307                 if(error) *error = "invalid RF64 file: all RIFF sizes are -1 (r11)";
 308                 return false;
 309         }
 310         if(eof_offset != ftello(f)) {
 311                 if(error) *error = "invalid WAVE file: unexpected EOF (010)";
 312                 return false;
 313         }
 314         if(!fm->format_block) {
 315                 if(error) *error = "invalid WAVE file: missing \"fmt \" chunk (011)";
 316                 return false;
 317         }
 318         if(!fm->audio_block) {
 319                 if(error) *error = "invalid WAVE file: missing \"data\" chunk (012)";
 320                 return false;
 321         }
 322         return true;
 323 }
 324
 325 static FLAC__bool read_from_wave64_(foreign_metadata_t *fm, FILE *f, const char **error)
 326 {
 327         FLAC__byte buffer[40];
 328         FLAC__off_t offset, eof_offset = -1;
 329         if((offset = ftello(f)) < 0) {
 330                 if(error) *error = "ftello() error (001)";
 331                 return false;
 332         }
 333         if(
 334                 fread(buffer, 1, 40, f) < 40 ||
 335                 /* RIFF GUID 66666972-912E-11CF-A5D6-28DB04C10000 */
 336                 memcmp(buffer, "\x72\x69\x66\x66\x2E\x91\xCF\x11\xA5\xD6\x28\xDB\x04\xC1\x00\x00", 16) ||
 337                 /* WAVE GUID 65766177-ACF3-11D3-8CD1-00C04F8EDB8A */
 338                 memcmp(buffer+24, "\x77\x61\x76\x65\xF3\xAC\xD3\x11\x8C\xD1\x00\xC0\x4F\x8E\xDB\x8A", 16)
 339         ) {
 340                 if(error) *error = "unsupported Wave64 layout (002)";
 341                 return false;
 342         }
 343         if(sizeof(FLAC__off_t) < 8) {
 344                 if(error) *error = "Wave64 is not supported on this compile (r00)";
 345                 return false;
 346         }
 347         if(!append_block_(fm, offset, 40, error))
 348                 return false;
 349         eof_offset = (FLAC__off_t)unpack64le_(buffer+16); /*@@@ [2^63 limit] */
 350         while(!feof(f)) {
 351                 FLAC__uint64 size;
 352                 if((offset = ftello(f)) < 0) {
 353                         if(error) *error = "ftello() error (003)";
 354                         return false;
 355                 }
 356                 if((size = fread(buffer, 1, 24, f)) < 24) {
 357                         if(size == 0 && feof(f))
 358                                 break;
 359                         if(error) *error = "invalid Wave64 file (004)";
 360                         return false;
 361                 }
 362                 size = unpack64le_(buffer+16);
 363                 /* check if pad bytes needed */
 364                 if(size & 7)
 365                         size = (size+7) & (~((FLAC__uint64)7));
 366                 /* fmt GUID 20746D66-ACF3-11D3-8CD1-00C04F8EDB8A */
 367                 if(!memcmp(buffer, "\x66\x6D\x74\x20\xF3\xAC\xD3\x11\x8C\xD1\x00\xC0\x4F\x8E\xDB\x8A", 16)) {
 368                         if(fm->format_block) {
 369                                 if(error) *error = "invalid Wave64 file: multiple \"fmt \" chunks (005)";
 370                                 return false;
 371                         }
 372                         if(fm->audio_block) {
 373                                 if(error) *error = "invalid Wave64 file: \"data\" chunk before \"fmt \" chunk (006)";
 374                                 return false;
 375                         }
 376                         fm->format_block = fm->num_blocks;
 377                 }
 378                 /* data GUID 61746164-ACF3-11D3-8CD1-00C04F8EDB8A */
 379                 else if(!memcmp(buffer, "\x64\x61\x74\x61\xF3\xAC\xD3\x11\x8C\xD1\x00\xC0\x4F\x8E\xDB\x8A", 16)) {
 380                         if(fm->audio_block) {
 381                                 if(error) *error = "invalid Wave64 file: multiple \"data\" chunks (007)";
 382                                 return false;
 383                         }
 384                         if(!fm->format_block) {
 385                                 if(error) *error = "invalid Wave64 file: \"data\" chunk before \"fmt \" chunk (008)";
 386                                 return false;
 387                         }
 388                         fm->audio_block = fm->num_blocks;
 389                 }
 390                 if(!append_block_(fm, offset, memcmp(buffer, "\x64\x61\x74\x61\xF3\xAC\xD3\x11\x8C\xD1\x00\xC0\x4F\x8E\xDB\x8A", 16)? (FLAC__uint32)size : 16+8, error))
 391                         return false;
 392                 /* skip to next chunk */
 393                 if(fseeko(f, size-24, SEEK_CUR) < 0) {
 394                         if(error) *error = "invalid Wave64 file: seek error (009)";
 395                         return false;
 396                 }
 397         }
 398         if(eof_offset != ftello(f)) {
 399                 if(error) *error = "invalid Wave64 file: unexpected EOF (010)";
 400                 return false;
 401         }
 402         if(!fm->format_block) {
 403                 if(error) *error = "invalid Wave64 file: missing \"fmt \" chunk (011)";
 404                 return false;
 405         }
 406         if(!fm->audio_block) {
 407                 if(error) *error = "invalid Wave64 file: missing \"data\" chunk (012)";
 408                 return false;
 409         }
 410         return true;
 411 }
 412
 413 static FLAC__bool write_to_flac_(foreign_metadata_t *fm, FILE *fin, FILE *fout, FLAC__Metadata_SimpleIterator *it, const char **error)
 414 {
 415         FLAC__byte buffer[4];
 416         const unsigned ID_LEN = FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
 417         size_t block_num = 0;
 418         FLAC__ASSERT(sizeof(buffer) >= ID_LEN);
 419         while(block_num < fm->num_blocks) {
 420                 /* find next matching padding block */
 421                 do {
 422                         /* even on the first chunk's loop there will be a skippable STREAMINFO block, on subsequent loops we are first moving past the PADDING we just used */
 423                         if(!FLAC__metadata_simple_iterator_next(it)) {
 424                                 if(error) *error = "no matching PADDING block found (004)";
 425                                 return false;
 426                         }
 427                 } while(FLAC__metadata_simple_iterator_get_block_type(it) != FLAC__METADATA_TYPE_PADDING);
 428                 if(FLAC__metadata_simple_iterator_get_block_length(it) != ID_LEN+fm->blocks[block_num].size) {
 429                         if(error) *error = "PADDING block with wrong size found (005)";
 430                         return false;
 431                 }
 432                 /* transfer chunk into APPLICATION block */
 433                 /* first set up the file pointers */
 434                 if(fseeko(fin, fm->blocks[block_num].offset, SEEK_SET) < 0) {
 435                         if(error) *error = "seek failed in WAVE/AIFF file (006)";
 436                         return false;
 437                 }
 438                 if(fseeko(fout, FLAC__metadata_simple_iterator_get_block_offset(it), SEEK_SET) < 0) {
 439                         if(error) *error = "seek failed in FLAC file (007)";
 440                         return false;
 441                 }
 442                 /* update the type */
 443                 buffer[0] = FLAC__METADATA_TYPE_APPLICATION;
 444                 if(FLAC__metadata_simple_iterator_is_last(it))
 445                         buffer[0] |= 0x80; /*MAGIC number*/
 446                 if(fwrite(buffer, 1, 1, fout) < 1) {
 447                         if(error) *error = "write failed in FLAC file (008)";
 448                         return false;
 449                 }
 450                 /* length stays the same so skip over it */
 451                 if(fseeko(fout, FLAC__STREAM_METADATA_LENGTH_LEN/8, SEEK_CUR) < 0) {
 452                         if(error) *error = "seek failed in FLAC file (009)";
 453                         return false;
 454                 }
 455                 /* write the APPLICATION ID */
 456                 memcpy(buffer, FLAC__FOREIGN_METADATA_APPLICATION_ID[fm->type], ID_LEN);
 457                 if(fwrite(buffer, 1, ID_LEN, fout) < ID_LEN) {
 458                         if(error) *error = "write failed in FLAC file (010)";
 459                         return false;
 460                 }
 461                 /* transfer the foreign metadata */
 462                 if(!copy_data_(fin, fout, fm->blocks[block_num].size, error, "read failed in WAVE/AIFF file (011)", "write failed in FLAC file (012)"))
 463                         return false;
 464                 block_num++;
 465         }
 466         return true;
 467 }
 468
 469 static FLAC__bool read_from_flac_(foreign_metadata_t *fm, FILE *f, FLAC__Metadata_SimpleIterator *it, const char **error)
 470 {
 471         FLAC__byte id[4], buffer[12];
 472         FLAC__off_t offset;
 473         FLAC__bool type_found = false, ds64_found = false;
 474
 475         FLAC__ASSERT(FLAC__STREAM_METADATA_APPLICATION_ID_LEN == sizeof(id)*8);
 476
 477         while(FLAC__metadata_simple_iterator_next(it)) {
 478                 if(FLAC__metadata_simple_iterator_get_block_type(it) != FLAC__METADATA_TYPE_APPLICATION)
 479                         continue;
 480                 if(!FLAC__metadata_simple_iterator_get_application_id(it, id)) {
 481                         if(error) *error = "FLAC__metadata_simple_iterator_get_application_id() error (002)";
 482                         return false;
 483                 }
 484                 if(memcmp(id, FLAC__FOREIGN_METADATA_APPLICATION_ID[fm->type], sizeof(id)))
 485                         continue;
 486                 offset = FLAC__metadata_simple_iterator_get_block_offset(it);
 487                 /* skip over header and app ID */
 488                 offset += (FLAC__STREAM_METADATA_IS_LAST_LEN + FLAC__STREAM_METADATA_TYPE_LEN + FLAC__STREAM_METADATA_LENGTH_LEN) / 8;
 489                 offset += sizeof(id);
 490                 /* look for format or audio blocks */
 491                 if(fseeko(f, offset, SEEK_SET) < 0) {
 492                         if(error) *error = "seek error (003)";
 493                         return false;
 494                 }
 495                 if(fread(buffer, 1, 4, f) != 4) {
 496                         if(error) *error = "read error (004)";
 497                         return false;
 498                 }
 499                 if(fm->num_blocks == 0) { /* first block? */
 500                         fm->is_rf64 = 0 == memcmp(buffer, "RF64", 4);
 501                         if(fm->type == FOREIGN_BLOCK_TYPE__RIFF && (0 == memcmp(buffer, "RIFF", 4) || fm->is_rf64))
 502                                 type_found = true;
 503                         else if(fm->type == FOREIGN_BLOCK_TYPE__WAVE64 && 0 == memcmp(buffer, "riff", 4)) /* use first 4 bytes instead of whole GUID */
 504                                 type_found = true;
 505                         else if(fm->type == FOREIGN_BLOCK_TYPE__AIFF && 0 == memcmp(buffer, "FORM", 4))
 506                                 type_found = true;
 507                         else {
 508                                 if(error) *error = "unsupported foreign metadata found, may need newer FLAC decoder (005)";
 509                                 return false;
 510                         }
 511                 }
 512                 else if(!type_found) {
 513                         FLAC__ASSERT(0);
 514                         /* double protection: */
 515                         if(error) *error = "unsupported foreign metadata found, may need newer FLAC decoder (006)";
 516                         return false;
 517                 }
 518                 else if(fm->type == FOREIGN_BLOCK_TYPE__RIFF) {
 519                         if(!memcmp(buffer, "fmt ", 4)) {
 520                                 if(fm->format_block) {
 521                                         if(error) *error = "invalid WAVE metadata: multiple \"fmt \" chunks (007)";
 522                                         return false;
 523                                 }
 524                                 if(fm->audio_block) {
 525                                         if(error) *error = "invalid WAVE metadata: \"data\" chunk before \"fmt \" chunk (008)";
 526                                         return false;
 527                                 }
 528                                 fm->format_block = fm->num_blocks;
 529                         }
 530                         else if(!memcmp(buffer, "data", 4)) {
 531                                 if(fm->audio_block) {
 532                                         if(error) *error = "invalid WAVE metadata: multiple \"data\" chunks (009)";
 533                                         return false;
 534                                 }
 535                                 if(!fm->format_block) {
 536                                         if(error) *error = "invalid WAVE metadata: \"data\" chunk before \"fmt \" chunk (010)";
 537                                         return false;
 538                                 }
 539                                 fm->audio_block = fm->num_blocks;
 540                         }
 541                         else if(fm->is_rf64 && fm->num_blocks == 1) {
 542                                 if(memcmp(buffer, "ds64", 4)) {
 543                                         if(error) *error = "invalid RF64 metadata: second chunk is not \"ds64\" (011)";
 544                                         return false;
 545                                 }
 546                                 ds64_found = true;
 547                         }
 548                 }
 549                 else if(fm->type == FOREIGN_BLOCK_TYPE__WAVE64) {
 550                         if(!memcmp(buffer, "fmt ", 4)) { /* use first 4 bytes instead of whole GUID */
 551                                 if(fm->format_block) {
 552                                         if(error) *error = "invalid Wave64 metadata: multiple \"fmt \" chunks (012)";
 553                                         return false;
 554                                 }
 555                                 if(fm->audio_block) {
 556                                         if(error) *error = "invalid Wave64 metadata: \"data\" chunk before \"fmt \" chunk (013)";
 557                                         return false;
 558                                 }
 559                                 fm->format_block = fm->num_blocks;
 560                         }
 561                         else if(!memcmp(buffer, "data", 4)) { /* use first 4 bytes instead of whole GUID */
 562                                 if(fm->audio_block) {
 563                                         if(error) *error = "invalid Wave64 metadata: multiple \"data\" chunks (014)";
 564                                         return false;
 565                                 }
 566                                 if(!fm->format_block) {
 567                                         if(error) *error = "invalid Wave64 metadata: \"data\" chunk before \"fmt \" chunk (015)";
 568                                         return false;
 569                                 }
 570                                 fm->audio_block = fm->num_blocks;
 571                         }
 572                 }
 573                 else if(fm->type == FOREIGN_BLOCK_TYPE__AIFF) {
 574                         if(!memcmp(buffer, "COMM", 4)) {
 575                                 if(fm->format_block) {
 576                                         if(error) *error = "invalid AIFF metadata: multiple \"COMM\" chunks (016)";
 577                                         return false;
 578                                 }
 579                                 if(fm->audio_block) {
 580                                         if(error) *error = "invalid AIFF metadata: \"SSND\" chunk before \"COMM\" chunk (017)";
 581                                         return false;
 582                                 }
 583                                 fm->format_block = fm->num_blocks;
 584                         }
 585                         else if(!memcmp(buffer, "SSND", 4)) {
 586                                 if(fm->audio_block) {
 587                                         if(error) *error = "invalid AIFF metadata: multiple \"SSND\" chunks (018)";
 588                                         return false;
 589                                 }
 590                                 if(!fm->format_block) {
 591                                         if(error) *error = "invalid AIFF metadata: \"SSND\" chunk before \"COMM\" chunk (019)";
 592                                         return false;
 593                                 }
 594                                 fm->audio_block = fm->num_blocks;
 595                                 /* read SSND offset size */
 596                                 if(fread(buffer+4, 1, 8, f) != 8) {
 597                                         if(error) *error = "read error (020)";
 598                                         return false;
 599                                 }
 600                                 fm->ssnd_offset_size = unpack32be_(buffer+8);
 601                         }
 602                 }
 603                 else {
 604                         FLAC__ASSERT(0);
 605                         /* double protection: */
 606                         if(error) *error = "unsupported foreign metadata found, may need newer FLAC decoder (021)";
 607                         return false;
 608                 }
 609                 if(!append_block_(fm, offset, FLAC__metadata_simple_iterator_get_block_length(it)-sizeof(id), error))
 610                         return false;
 611         }
 612         if(!type_found) {
 613                 if(error) *error = "no foreign metadata found (022)";
 614                 return false;
 615         }
 616         if(fm->is_rf64 && !ds64_found) {
 617                 if(error) *error = "invalid RF64 file: second chunk is not \"ds64\" (023)";
 618                 return false;
 619         }
 620         if(!fm->format_block) {
 621                 if(error)
 622                         *error =
 623                                 fm->type==FOREIGN_BLOCK_TYPE__RIFF? "invalid WAVE file: missing \"fmt \" chunk (024)" :
 624                                 fm->type==FOREIGN_BLOCK_TYPE__WAVE64? "invalid Wave64 file: missing \"fmt \" chunk (025)" :
 625                                 "invalid AIFF file: missing \"COMM\" chunk (026)";
 626                 return false;
 627         }
 628         if(!fm->audio_block) {
 629                 if(error)
 630                         *error =
 631                                 fm->type==FOREIGN_BLOCK_TYPE__RIFF? "invalid WAVE file: missing \"data\" chunk (027)" :
 632                                 fm->type==FOREIGN_BLOCK_TYPE__WAVE64? "invalid Wave64 file: missing \"data\" chunk (028)" :
 633                                 "invalid AIFF file: missing \"SSND\" chunk (029)";
 634                 return false;
 635         }
 636         return true;
 637 }
 638
 639 static FLAC__bool write_to_iff_(foreign_metadata_t *fm, FILE *fin, FILE *fout, FLAC__off_t offset1, FLAC__off_t offset2, FLAC__off_t offset3, const char **error)
 640 {
 641         size_t i;
 642         if(fseeko(fout, offset1, SEEK_SET) < 0) {
 643                 if(error) *error = "seek failed in WAVE/AIFF file (002)";
 644                 return false;
 645         }
 646         /* don't write first (RIFF/RF64/FORM) chunk, or ds64 chunk in the case of RF64 */
 647         for(i = fm->is_rf64?2:1; i < fm->format_block; i++) {
 648                 if(fseeko(fin, fm->blocks[i].offset, SEEK_SET) < 0) {
 649                         if(error) *error = "seek failed in FLAC file (003)";
 650                         return false;
 651                 }
 652                 if(!copy_data_(fin, fout, fm->blocks[i].size, error, "read failed in WAVE/AIFF file (004)", "write failed in FLAC file (005)"))
 653                         return false;
 654         }
 655         if(fseeko(fout, offset2, SEEK_SET) < 0) {
 656                 if(error) *error = "seek failed in WAVE/AIFF file (006)";
 657                 return false;
 658         }
 659         for(i = fm->format_block+1; i < fm->audio_block; i++) {
 660                 if(fseeko(fin, fm->blocks[i].offset, SEEK_SET) < 0) {
 661                         if(error) *error = "seek failed in FLAC file (007)";
 662                         return false;
 663                 }
 664                 if(!copy_data_(fin, fout, fm->blocks[i].size, error, "read failed in WAVE/AIFF file (008)", "write failed in FLAC file (009)"))
 665                         return false;
 666         }
 667         if(fseeko(fout, offset3, SEEK_SET) < 0) {
 668                 if(error) *error = "seek failed in WAVE/AIFF file (010)";
 669                 return false;
 670         }
 671         for(i = fm->audio_block+1; i < fm->num_blocks; i++) {
 672                 if(fseeko(fin, fm->blocks[i].offset, SEEK_SET) < 0) {
 673                         if(error) *error = "seek failed in FLAC file (011)";
 674                         return false;
 675                 }
 676                 if(!copy_data_(fin, fout, fm->blocks[i].size, error, "read failed in WAVE/AIFF file (012)", "write failed in FLAC file (013)"))
 677                         return false;
 678         }
 679         return true;
 680 }
 681
 682 foreign_metadata_t *flac__foreign_metadata_new(foreign_block_type_t type)
 683 {
 684         /* calloc() to zero all the member variables */
 685         foreign_metadata_t *x = calloc(sizeof(foreign_metadata_t), 1);
 686         if(x) {
 687                 x->type = type;
 688                 x->is_rf64 = false;
 689         }
 690         return x;
 691 }
 692
 693 void flac__foreign_metadata_delete(foreign_metadata_t *fm)
 694 {
 695         if(fm) {
 696                 if(fm->blocks)
 697                         free(fm->blocks);
 698                 free(fm);
 699         }
 700 }
 701
 702 FLAC__bool flac__foreign_metadata_read_from_aiff(foreign_metadata_t *fm, const char *filename, const char **error)
 703 {
 704         FLAC__bool ok;
 705         FILE *f = fopen(filename, "rb");
 706         if(!f) {
 707                 if(error) *error = "can't open AIFF file for reading (000)";
 708                 return false;
 709         }
 710         ok = read_from_aiff_(fm, f, error);
 711         fclose(f);
 712         return ok;
 713 }
 714
 715 FLAC__bool flac__foreign_metadata_read_from_wave(foreign_metadata_t *fm, const char *filename, const char **error)
 716 {
 717         FLAC__bool ok;
 718         FILE *f = fopen(filename, "rb");
 719         if(!f) {
 720                 if(error) *error = "can't open WAVE file for reading (000)";
 721                 return false;
 722         }
 723         ok = read_from_wave_(fm, f, error);
 724         fclose(f);
 725         return ok;
 726 }
 727
 728 FLAC__bool flac__foreign_metadata_read_from_wave64(foreign_metadata_t *fm, const char *filename, const char **error)
 729 {
 730         FLAC__bool ok;
 731         FILE *f = fopen(filename, "rb");
 732         if(!f) {
 733                 if(error) *error = "can't open Wave64 file for reading (000)";
 734                 return false;
 735         }
 736         ok = read_from_wave64_(fm, f, error);
 737         fclose(f);
 738         return ok;
 739 }
 740
 741 FLAC__bool flac__foreign_metadata_write_to_flac(foreign_metadata_t *fm, const char *infilename, const char *outfilename, const char **error)
 742 {
 743         FLAC__bool ok;
 744         FILE *fin, *fout;
 745         FLAC__Metadata_SimpleIterator *it = FLAC__metadata_simple_iterator_new();
 746         if(!it) {
 747                 if(error) *error = "out of memory (000)";
 748                 return false;
 749         }
 750         if(!FLAC__metadata_simple_iterator_init(it, outfilename, /*read_only=*/true, /*preserve_file_stats=*/false)) {
 751                 if(error) *error = "can't initialize iterator (001)";
 752                 FLAC__metadata_simple_iterator_delete(it);
 753                 return false;
 754         }
 755         if(0 == (fin = fopen(infilename, "rb"))) {
 756                 if(error) *error = "can't open WAVE/AIFF file for reading (002)";
 757                 FLAC__metadata_simple_iterator_delete(it);
 758                 return false;
 759         }
 760         if(0 == (fout = fopen(outfilename, "r+b"))) {
 761                 if(error) *error = "can't open FLAC file for updating (003)";
 762                 FLAC__metadata_simple_iterator_delete(it);
 763                 fclose(fin);
 764                 return false;
 765         }
 766         ok = write_to_flac_(fm, fin, fout, it, error);
 767         FLAC__metadata_simple_iterator_delete(it);
 768         fclose(fin);
 769         fclose(fout);
 770         return ok;
 771 }
 772
 773 FLAC__bool flac__foreign_metadata_read_from_flac(foreign_metadata_t *fm, const char *filename, const char **error)
 774 {
 775         FLAC__bool ok;
 776         FILE *f;
 777         FLAC__Metadata_SimpleIterator *it = FLAC__metadata_simple_iterator_new();
 778         if(!it) {
 779                 if(error) *error = "out of memory (000)";
 780                 return false;
 781         }
 782         if(!FLAC__metadata_simple_iterator_init(it, filename, /*read_only=*/true, /*preserve_file_stats=*/false)) {
 783                 if(error) *error = "can't initialize iterator (001)";
 784                 FLAC__metadata_simple_iterator_delete(it);
 785                 return false;
 786         }
 787         if(0 == (f = fopen(filename, "rb"))) {
 788                 if(error) *error = "can't open FLAC file for reading (002)";
 789                 FLAC__metadata_simple_iterator_delete(it);
 790                 return false;
 791         }
 792         ok = read_from_flac_(fm, f, it, error);
 793         FLAC__metadata_simple_iterator_delete(it);
 794         fclose(f);
 795         return ok;
 796 }
 797
 798 FLAC__bool flac__foreign_metadata_write_to_iff(foreign_metadata_t *fm, const char *infilename, const char *outfilename, FLAC__off_t offset1, FLAC__off_t offset2, FLAC__off_t offset3, const char **error)
 799 {
 800         FLAC__bool ok;
 801         FILE *fin, *fout;
 802         if(0 == (fin = fopen(infilename, "rb"))) {
 803                 if(error) *error = "can't open FLAC file for reading (000)";
 804                 return false;
 805         }
 806         if(0 == (fout = fopen(outfilename, "r+b"))) {
 807                 if(error) *error = "can't open WAVE/AIFF file for updating (001)";
 808                 fclose(fin);
 809                 return false;
 810         }
 811         ok = write_to_iff_(fm, fin, fout, offset1, offset2, offset3, error);
 812         fclose(fin);
 813         fclose(fout);
 814         return ok;
 815 }