src/libFLAC/file_decoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002,2003,2004  Josh Coalson
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * - Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * - Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * - Neither the name of the Xiph.org Foundation nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <stdio.h>
  33 #include <stdlib.h> /* for malloc() */
  34 #include <string.h> /* for strcmp() */
  35 #include <sys/stat.h> /* for stat() */
  36 #if defined _MSC_VER || defined __MINGW32__
  37 #include <io.h> /* for _setmode() */
  38 #include <fcntl.h> /* for _O_BINARY */
  39 #elif defined __CYGWIN__
  40 #include <io.h> /* for setmode(), O_BINARY */
  41 #include <fcntl.h> /* for _O_BINARY */
  42 #endif
  43 #include "FLAC/assert.h"
  44 #include "protected/file_decoder.h"
  45 #include "protected/seekable_stream_decoder.h"
  46
  47 /***********************************************************************
  48  *
  49  * Private class method prototypes
  50  *
  51  ***********************************************************************/
  52
  53 static void set_defaults_(FLAC__FileDecoder *decoder);
  54 static FILE *get_binary_stdin_();
  55 static FLAC__SeekableStreamDecoderReadStatus read_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
  56 static FLAC__SeekableStreamDecoderSeekStatus seek_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
  57 static FLAC__SeekableStreamDecoderTellStatus tell_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
  58 static FLAC__SeekableStreamDecoderLengthStatus length_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
  59 static FLAC__bool eof_callback_(const FLAC__SeekableStreamDecoder *decoder, void *client_data);
  60 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
  61 static void metadata_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
  62 static void error_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  63
  64 /***********************************************************************
  65  *
  66  * Private class data
  67  *
  68  ***********************************************************************/
  69
  70 typedef struct FLAC__FileDecoderPrivate {
  71         FLAC__FileDecoderWriteCallback write_callback;
  72         FLAC__FileDecoderMetadataCallback metadata_callback;
  73         FLAC__FileDecoderErrorCallback error_callback;
  74         void *client_data;
  75         FILE *file;
  76         char *filename; /* == NULL if stdin */
  77         FLAC__SeekableStreamDecoder *seekable_stream_decoder;
  78 } FLAC__FileDecoderPrivate;
  79
  80 /***********************************************************************
  81  *
  82  * Public static class data
  83  *
  84  ***********************************************************************/
  85
  86 FLAC_API const char * const FLAC__FileDecoderStateString[] = {
  87         "FLAC__FILE_DECODER_OK",
  88         "FLAC__FILE_DECODER_END_OF_FILE",
  89         "FLAC__FILE_DECODER_ERROR_OPENING_FILE",
  90         "FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR",
  91         "FLAC__FILE_DECODER_SEEK_ERROR",
  92         "FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR",
  93         "FLAC__FILE_DECODER_ALREADY_INITIALIZED",
  94         "FLAC__FILE_DECODER_INVALID_CALLBACK",
  95         "FLAC__FILE_DECODER_UNINITIALIZED"
  96 };
  97
  98 /***********************************************************************
  99  *
 100  * Class constructor/destructor
 101  *
 102  ***********************************************************************/
 103
 104 FLAC_API FLAC__FileDecoder *FLAC__file_decoder_new()
 105 {
 106         FLAC__FileDecoder *decoder;
 107
 108         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 109
 110         decoder = (FLAC__FileDecoder*)calloc(1, sizeof(FLAC__FileDecoder));
 111         if(decoder == 0) {
 112                 return 0;
 113         }
 114
 115         decoder->protected_ = (FLAC__FileDecoderProtected*)calloc(1, sizeof(FLAC__FileDecoderProtected));
 116         if(decoder->protected_ == 0) {
 117                 free(decoder);
 118                 return 0;
 119         }
 120
 121         decoder->private_ = (FLAC__FileDecoderPrivate*)calloc(1, sizeof(FLAC__FileDecoderPrivate));
 122         if(decoder->private_ == 0) {
 123                 free(decoder->protected_);
 124                 free(decoder);
 125                 return 0;
 126         }
 127
 128         decoder->private_->seekable_stream_decoder = FLAC__seekable_stream_decoder_new();
 129         if(0 == decoder->private_->seekable_stream_decoder) {
 130                 free(decoder->private_);
 131                 free(decoder->protected_);
 132                 free(decoder);
 133                 return 0;
 134         }
 135
 136         decoder->private_->file = 0;
 137
 138         set_defaults_(decoder);
 139
 140         decoder->protected_->state = FLAC__FILE_DECODER_UNINITIALIZED;
 141
 142         return decoder;
 143 }
 144
 145 FLAC_API void FLAC__file_decoder_delete(FLAC__FileDecoder *decoder)
 146 {
 147         FLAC__ASSERT(0 != decoder);
 148         FLAC__ASSERT(0 != decoder->protected_);
 149         FLAC__ASSERT(0 != decoder->private_);
 150         FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
 151
 152         (void)FLAC__file_decoder_finish(decoder);
 153
 154         FLAC__seekable_stream_decoder_delete(decoder->private_->seekable_stream_decoder);
 155
 156         free(decoder->private_);
 157         free(decoder->protected_);
 158         free(decoder);
 159 }
 160
 161 /***********************************************************************
 162  *
 163  * Public class methods
 164  *
 165  ***********************************************************************/
 166
 167 FLAC_API FLAC__FileDecoderState FLAC__file_decoder_init(FLAC__FileDecoder *decoder)
 168 {
 169         FLAC__ASSERT(0 != decoder);
 170
 171         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 172                 return decoder->protected_->state = FLAC__FILE_DECODER_ALREADY_INITIALIZED;
 173
 174         if(0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
 175                 return decoder->protected_->state = FLAC__FILE_DECODER_INVALID_CALLBACK;
 176
 177         if(0 == decoder->private_->filename)
 178                 decoder->private_->file = get_binary_stdin_();
 179         else
 180                 decoder->private_->file = fopen(decoder->private_->filename, "rb");
 181
 182         if(decoder->private_->file == 0)
 183                 return decoder->protected_->state = FLAC__FILE_DECODER_ERROR_OPENING_FILE;
 184
 185         FLAC__seekable_stream_decoder_set_read_callback(decoder->private_->seekable_stream_decoder, read_callback_);
 186         FLAC__seekable_stream_decoder_set_seek_callback(decoder->private_->seekable_stream_decoder, seek_callback_);
 187         FLAC__seekable_stream_decoder_set_tell_callback(decoder->private_->seekable_stream_decoder, tell_callback_);
 188         FLAC__seekable_stream_decoder_set_length_callback(decoder->private_->seekable_stream_decoder, length_callback_);
 189         FLAC__seekable_stream_decoder_set_eof_callback(decoder->private_->seekable_stream_decoder, eof_callback_);
 190         FLAC__seekable_stream_decoder_set_write_callback(decoder->private_->seekable_stream_decoder, write_callback_);
 191         FLAC__seekable_stream_decoder_set_metadata_callback(decoder->private_->seekable_stream_decoder, metadata_callback_);
 192         FLAC__seekable_stream_decoder_set_error_callback(decoder->private_->seekable_stream_decoder, error_callback_);
 193         FLAC__seekable_stream_decoder_set_client_data(decoder->private_->seekable_stream_decoder, decoder);
 194
 195         if(FLAC__seekable_stream_decoder_init(decoder->private_->seekable_stream_decoder) != FLAC__SEEKABLE_STREAM_DECODER_OK)
 196                 return decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR;
 197
 198         return decoder->protected_->state = FLAC__FILE_DECODER_OK;
 199 }
 200
 201 FLAC_API FLAC__bool FLAC__file_decoder_finish(FLAC__FileDecoder *decoder)
 202 {
 203         FLAC__ASSERT(0 != decoder);
 204
 205         if(decoder->protected_->state == FLAC__FILE_DECODER_UNINITIALIZED)
 206                 return true;
 207
 208         FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
 209
 210         if(0 != decoder->private_->file && decoder->private_->file != stdin) {
 211                 fclose(decoder->private_->file);
 212                 decoder->private_->file = 0;
 213         }
 214
 215         if(0 != decoder->private_->filename) {
 216                 free(decoder->private_->filename);
 217                 decoder->private_->filename = 0;
 218         }
 219
 220         set_defaults_(decoder);
 221
 222         decoder->protected_->state = FLAC__FILE_DECODER_UNINITIALIZED;
 223
 224         return FLAC__seekable_stream_decoder_finish(decoder->private_->seekable_stream_decoder);
 225 }
 226
 227 FLAC_API FLAC__bool FLAC__file_decoder_set_md5_checking(FLAC__FileDecoder *decoder, FLAC__bool value)
 228 {
 229         FLAC__ASSERT(0 != decoder);
 230         FLAC__ASSERT(0 != decoder->private_);
 231         FLAC__ASSERT(0 != decoder->protected_);
 232         FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
 233         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 234                 return false;
 235         return FLAC__seekable_stream_decoder_set_md5_checking(decoder->private_->seekable_stream_decoder, value);
 236 }
 237
 238 FLAC_API FLAC__bool FLAC__file_decoder_set_filename(FLAC__FileDecoder *decoder, const char *value)
 239 {
 240         FLAC__ASSERT(0 != decoder);
 241         FLAC__ASSERT(0 != decoder->private_);
 242         FLAC__ASSERT(0 != decoder->protected_);
 243         FLAC__ASSERT(0 != value);
 244         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 245                 return false;
 246         if(0 != decoder->private_->filename) {
 247                 free(decoder->private_->filename);
 248                 decoder->private_->filename = 0;
 249         }
 250         if(0 != strcmp(value, "-")) {
 251                 if(0 == (decoder->private_->filename = (char*)malloc(strlen(value)+1))) {
 252                         decoder->protected_->state = FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR;
 253                         return false;
 254                 }
 255                 strcpy(decoder->private_->filename, value);
 256         }
 257         return true;
 258 }
 259
 260 FLAC_API FLAC__bool FLAC__file_decoder_set_write_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderWriteCallback value)
 261 {
 262         FLAC__ASSERT(0 != decoder);
 263         FLAC__ASSERT(0 != decoder->private_);
 264         FLAC__ASSERT(0 != decoder->protected_);
 265         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 266                 return false;
 267         decoder->private_->write_callback = value;
 268         return true;
 269 }
 270
 271 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderMetadataCallback value)
 272 {
 273         FLAC__ASSERT(0 != decoder);
 274         FLAC__ASSERT(0 != decoder->private_);
 275         FLAC__ASSERT(0 != decoder->protected_);
 276         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 277                 return false;
 278         decoder->private_->metadata_callback = value;
 279         return true;
 280 }
 281
 282 FLAC_API FLAC__bool FLAC__file_decoder_set_error_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderErrorCallback value)
 283 {
 284         FLAC__ASSERT(0 != decoder);
 285         FLAC__ASSERT(0 != decoder->private_);
 286         FLAC__ASSERT(0 != decoder->protected_);
 287         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 288                 return false;
 289         decoder->private_->error_callback = value;
 290         return true;
 291 }
 292
 293 FLAC_API FLAC__bool FLAC__file_decoder_set_client_data(FLAC__FileDecoder *decoder, void *value)
 294 {
 295         FLAC__ASSERT(0 != decoder);
 296         FLAC__ASSERT(0 != decoder->private_);
 297         FLAC__ASSERT(0 != decoder->protected_);
 298         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 299                 return false;
 300         decoder->private_->client_data = value;
 301         return true;
 302 }
 303
 304 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_respond(FLAC__FileDecoder *decoder, FLAC__MetadataType type)
 305 {
 306         FLAC__ASSERT(0 != decoder);
 307         FLAC__ASSERT(0 != decoder->private_);
 308         FLAC__ASSERT(0 != decoder->protected_);
 309         FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
 310         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 311                 return false;
 312         return FLAC__seekable_stream_decoder_set_metadata_respond(decoder->private_->seekable_stream_decoder, type);
 313 }
 314
 315 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_respond_application(FLAC__FileDecoder *decoder, const FLAC__byte id[4])
 316 {
 317         FLAC__ASSERT(0 != decoder);
 318         FLAC__ASSERT(0 != decoder->private_);
 319         FLAC__ASSERT(0 != decoder->protected_);
 320         FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
 321         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 322                 return false;
 323         return FLAC__seekable_stream_decoder_set_metadata_respond_application(decoder->private_->seekable_stream_decoder, id);
 324 }
 325
 326 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_respond_all(FLAC__FileDecoder *decoder)
 327 {
 328         FLAC__ASSERT(0 != decoder);
 329         FLAC__ASSERT(0 != decoder->private_);
 330         FLAC__ASSERT(0 != decoder->protected_);
 331         FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
 332         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 333                 return false;
 334         return FLAC__seekable_stream_decoder_set_metadata_respond_all(decoder->private_->seekable_stream_decoder);
 335 }
 336
 337 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_ignore(FLAC__FileDecoder *decoder, FLAC__MetadataType type)
 338 {
 339         FLAC__ASSERT(0 != decoder);
 340         FLAC__ASSERT(0 != decoder->private_);
 341         FLAC__ASSERT(0 != decoder->protected_);
 342         FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
 343         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 344                 return false;
 345         return FLAC__seekable_stream_decoder_set_metadata_ignore(decoder->private_->seekable_stream_decoder, type);
 346 }
 347
 348 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_ignore_application(FLAC__FileDecoder *decoder, const FLAC__byte id[4])
 349 {
 350         FLAC__ASSERT(0 != decoder);
 351         FLAC__ASSERT(0 != decoder->private_);
 352         FLAC__ASSERT(0 != decoder->protected_);
 353         FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
 354         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 355                 return false;
 356         return FLAC__seekable_stream_decoder_set_metadata_ignore_application(decoder->private_->seekable_stream_decoder, id);
 357 }
 358
 359 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_ignore_all(FLAC__FileDecoder *decoder)
 360 {
 361         FLAC__ASSERT(0 != decoder);
 362         FLAC__ASSERT(0 != decoder->private_);
 363         FLAC__ASSERT(0 != decoder->protected_);
 364         FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
 365         if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
 366                 return false;
 367         return FLAC__seekable_stream_decoder_set_metadata_ignore_all(decoder->private_->seekable_stream_decoder);
 368 }
 369
 370 FLAC_API FLAC__FileDecoderState FLAC__file_decoder_get_state(const FLAC__FileDecoder *decoder)
 371 {
 372         FLAC__ASSERT(0 != decoder);
 373         FLAC__ASSERT(0 != decoder->protected_);
 374         return decoder->protected_->state;
 375 }
 376
 377 FLAC_API FLAC__SeekableStreamDecoderState FLAC__file_decoder_get_seekable_stream_decoder_state(const FLAC__FileDecoder *decoder)
 378 {
 379         FLAC__ASSERT(0 != decoder);
 380         FLAC__ASSERT(0 != decoder->private_);
 381         return FLAC__seekable_stream_decoder_get_state(decoder->private_->seekable_stream_decoder);
 382 }
 383
 384 FLAC_API FLAC__StreamDecoderState FLAC__file_decoder_get_stream_decoder_state(const FLAC__FileDecoder *decoder)
 385 {
 386         FLAC__ASSERT(0 != decoder);
 387         FLAC__ASSERT(0 != decoder->private_);
 388         return FLAC__seekable_stream_decoder_get_stream_decoder_state(decoder->private_->seekable_stream_decoder);
 389 }
 390
 391 FLAC_API const char *FLAC__file_decoder_get_resolved_state_string(const FLAC__FileDecoder *decoder)
 392 {
 393         if(decoder->protected_->state != FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR)
 394                 return FLAC__FileDecoderStateString[decoder->protected_->state];
 395         else
 396                 return FLAC__seekable_stream_decoder_get_resolved_state_string(decoder->private_->seekable_stream_decoder);
 397 }
 398
 399 FLAC_API FLAC__bool FLAC__file_decoder_get_md5_checking(const FLAC__FileDecoder *decoder)
 400 {
 401         FLAC__ASSERT(0 != decoder);
 402         FLAC__ASSERT(0 != decoder->private_);
 403         return FLAC__seekable_stream_decoder_get_md5_checking(decoder->private_->seekable_stream_decoder);
 404 }
 405
 406 FLAC_API unsigned FLAC__file_decoder_get_channels(const FLAC__FileDecoder *decoder)
 407 {
 408         FLAC__ASSERT(0 != decoder);
 409         FLAC__ASSERT(0 != decoder->private_);
 410         return FLAC__seekable_stream_decoder_get_channels(decoder->private_->seekable_stream_decoder);
 411 }
 412
 413 FLAC_API FLAC__ChannelAssignment FLAC__file_decoder_get_channel_assignment(const FLAC__FileDecoder *decoder)
 414 {
 415         FLAC__ASSERT(0 != decoder);
 416         FLAC__ASSERT(0 != decoder->private_);
 417         return FLAC__seekable_stream_decoder_get_channel_assignment(decoder->private_->seekable_stream_decoder);
 418 }
 419
 420 FLAC_API unsigned FLAC__file_decoder_get_bits_per_sample(const FLAC__FileDecoder *decoder)
 421 {
 422         FLAC__ASSERT(0 != decoder);
 423         FLAC__ASSERT(0 != decoder->private_);
 424         return FLAC__seekable_stream_decoder_get_bits_per_sample(decoder->private_->seekable_stream_decoder);
 425 }
 426
 427 FLAC_API unsigned FLAC__file_decoder_get_sample_rate(const FLAC__FileDecoder *decoder)
 428 {
 429         FLAC__ASSERT(0 != decoder);
 430         FLAC__ASSERT(0 != decoder->private_);
 431         return FLAC__seekable_stream_decoder_get_sample_rate(decoder->private_->seekable_stream_decoder);
 432 }
 433
 434 FLAC_API unsigned FLAC__file_decoder_get_blocksize(const FLAC__FileDecoder *decoder)
 435 {
 436         FLAC__ASSERT(0 != decoder);
 437         FLAC__ASSERT(0 != decoder->private_);
 438         return FLAC__seekable_stream_decoder_get_blocksize(decoder->private_->seekable_stream_decoder);
 439 }
 440
 441 FLAC_API FLAC__bool FLAC__file_decoder_get_decode_position(const FLAC__FileDecoder *decoder, FLAC__uint64 *position)
 442 {
 443         FLAC__ASSERT(0 != decoder);
 444         FLAC__ASSERT(0 != decoder->private_);
 445         return FLAC__seekable_stream_decoder_get_decode_position(decoder->private_->seekable_stream_decoder, position);
 446 }
 447
 448 FLAC_API FLAC__bool FLAC__file_decoder_process_single(FLAC__FileDecoder *decoder)
 449 {
 450         FLAC__bool ret;
 451         FLAC__ASSERT(0 != decoder);
 452
 453         if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM)
 454                 decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE;
 455
 456         if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE)
 457                 return true;
 458
 459         FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK);
 460
 461         ret = FLAC__seekable_stream_decoder_process_single(decoder->private_->seekable_stream_decoder);
 462         if(!ret)
 463                 decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR;
 464
 465         return ret;
 466 }
 467
 468 FLAC_API FLAC__bool FLAC__file_decoder_process_until_end_of_metadata(FLAC__FileDecoder *decoder)
 469 {
 470         FLAC__bool ret;
 471         FLAC__ASSERT(0 != decoder);
 472
 473         if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM)
 474                 decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE;
 475
 476         if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE)
 477                 return true;
 478
 479         FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK);
 480
 481         ret = FLAC__seekable_stream_decoder_process_until_end_of_metadata(decoder->private_->seekable_stream_decoder);
 482         if(!ret)
 483                 decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR;
 484
 485         return ret;
 486 }
 487
 488 FLAC_API FLAC__bool FLAC__file_decoder_process_until_end_of_file(FLAC__FileDecoder *decoder)
 489 {
 490         FLAC__bool ret;
 491         FLAC__ASSERT(0 != decoder);
 492
 493         if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM)
 494                 decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE;
 495
 496         if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE)
 497                 return true;
 498
 499         FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK);
 500
 501         ret = FLAC__seekable_stream_decoder_process_until_end_of_stream(decoder->private_->seekable_stream_decoder);
 502         if(!ret)
 503                 decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR;
 504
 505         return ret;
 506 }
 507
 508 FLAC_API FLAC__bool FLAC__file_decoder_seek_absolute(FLAC__FileDecoder *decoder, FLAC__uint64 sample)
 509 {
 510         FLAC__ASSERT(0 != decoder);
 511         FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK || decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE);
 512
 513         if(decoder->private_->filename == 0) { /* means the file is stdin... */
 514                 decoder->protected_->state = FLAC__FILE_DECODER_SEEK_ERROR;
 515                 return false;
 516         }
 517
 518         if(!FLAC__seekable_stream_decoder_seek_absolute(decoder->private_->seekable_stream_decoder, sample)) {
 519                 decoder->protected_->state = FLAC__FILE_DECODER_SEEK_ERROR;
 520                 return false;
 521         }
 522         else {
 523                 decoder->protected_->state = FLAC__FILE_DECODER_OK;
 524                 return true;
 525         }
 526 }
 527
 528
 529 /***********************************************************************
 530  *
 531  * Private class methods
 532  *
 533  ***********************************************************************/
 534
 535 void set_defaults_(FLAC__FileDecoder *decoder)
 536 {
 537         FLAC__ASSERT(0 != decoder);
 538         FLAC__ASSERT(0 != decoder->private_);
 539
 540         decoder->private_->filename = 0;
 541         decoder->private_->write_callback = 0;
 542         decoder->private_->metadata_callback = 0;
 543         decoder->private_->error_callback = 0;
 544         decoder->private_->client_data = 0;
 545 }
 546
 547 /*
 548  * This will forcibly set stdin to binary mode (for OSes that require it)
 549  */
 550 FILE *get_binary_stdin_()
 551 {
 552         /* if something breaks here it is probably due to the presence or
 553          * absence of an underscore before the identifiers 'setmode',
 554          * 'fileno', and/or 'O_BINARY'; check your system header files.
 555          */
 556 #if defined _MSC_VER || defined __MINGW32__
 557         _setmode(_fileno(stdin), _O_BINARY);
 558 #elif defined __CYGWIN__
 559         /* almost certainly not needed for any modern Cygwin, but let's be safe... */
 560         setmode(_fileno(stdin), _O_BINARY);
 561 #endif
 562
 563         return stdin;
 564 }
 565
 566 FLAC__SeekableStreamDecoderReadStatus read_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)
 567 {
 568         FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data;
 569         (void)decoder;
 570
 571         if(*bytes > 0) {
 572                 *bytes = (unsigned)fread(buffer, sizeof(FLAC__byte), *bytes, file_decoder->private_->file);
 573                 if(ferror(file_decoder->private_->file)) {
 574                         return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR;
 575                 }
 576                 else {
 577                         return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK;
 578                 }
 579         }
 580         else
 581                 return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR; /* abort to avoid a deadlock */
 582 }
 583
 584 FLAC__SeekableStreamDecoderSeekStatus seek_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
 585 {
 586         FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data;
 587         (void)decoder;
 588
 589         if(fseek(file_decoder->private_->file, (long)absolute_byte_offset, SEEK_SET) < 0)
 590                 return FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR;
 591         else
 592                 return FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK;
 593 }
 594
 595 FLAC__SeekableStreamDecoderTellStatus tell_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
 596 {
 597         FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data;
 598         long pos;
 599         (void)decoder;
 600
 601         if((pos = ftell(file_decoder->private_->file)) < 0)
 602                 return FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR;
 603         else {
 604                 *absolute_byte_offset = (FLAC__uint64)pos;
 605                 return FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK;
 606         }
 607 }
 608
 609 FLAC__SeekableStreamDecoderLengthStatus length_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
 610 {
 611         FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data;
 612         struct stat filestats;
 613         (void)decoder;
 614
 615         if(0 == file_decoder->private_->filename || stat(file_decoder->private_->filename, &filestats) != 0)
 616                 return FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR;
 617         else {
 618                 *stream_length = (FLAC__uint64)filestats.st_size;
 619                 return FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK;
 620         }
 621 }
 622
 623 FLAC__bool eof_callback_(const FLAC__SeekableStreamDecoder *decoder, void *client_data)
 624 {
 625         FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data;
 626         (void)decoder;
 627
 628         return feof(file_decoder->private_->file)? true : false;
 629 }
 630
 631 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
 632 {
 633         FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data;
 634         (void)decoder;
 635
 636         return file_decoder->private_->write_callback(file_decoder, frame, buffer, file_decoder->private_->client_data);
 637 }
 638
 639 void metadata_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
 640 {
 641         FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data;
 642         (void)decoder;
 643
 644         file_decoder->private_->metadata_callback(file_decoder, metadata, file_decoder->private_->client_data);
 645 }
 646
 647 void error_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
 648 {
 649         FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data;
 650         (void)decoder;
 651
 652         file_decoder->private_->error_callback(file_decoder, status, file_decoder->private_->client_data);
 653 }