metadata_iterators.c

/* libFLAC - Free Lossless Audio Codec library * Copyright (C) 2001-2009 Josh Coalson * Copyright (C) 2011-2016 Xiph.Org Foundation * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of the Xiph.org Foundation nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdarg.h> #include <sys/stat.h> /* for stat(), maybe chmod() */ #include "private/metadata.h" #include "FLAC/assert.h" #include "FLAC/stream_decoder.h" #include "share/alloc.h" #include "share/compat.h" #include "share/macros.h" #include "share/safe_str.h" #include "private/macros.h" #include "private/memory.h" /* Alias the first (in share/alloc.h) to the second (in src/libFLAC/memory.c). */ #define safe_malloc_mul_2op_ safe_malloc_mul_2op_p /**************************************************************************** * * Local function declarations * ***************************************************************************/ static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, uint32_t bytes); static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, uint32_t bytes); static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, uint32_t bytes); static FLAC__uint32 unpack_uint32_(FLAC__byte *b, uint32_t bytes); static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, uint32_t bytes); static FLAC__uint64 unpack_uint64_(FLAC__byte *b, uint32_t bytes); static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator); static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block); static FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, uint32_t *length); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, uint32_t block_length); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, uint32_t block_length); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, uint32_t block_length); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry, uint32_t max_length); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_VorbisComment *block, uint32_t block_length); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block); static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, uint32_t block_length); static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block); static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block); static FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block); static FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block); static FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block); static FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, uint32_t block_length); static FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, uint32_t block_length); static FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block); static FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block); static FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block); static FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block); static FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, uint32_t block_length); static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block); static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, uint32_t padding_length, FLAC__bool padding_is_last); static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append); static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator); static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator); static uint32_t seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb); static uint32_t seek_to_first_metadata_block_(FILE *f); static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append); static FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, FLAC__off_t fixup_is_last_flag_offset, FLAC__bool backup); static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status); static FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status); static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status); static FLAC__bool copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__Metadata_SimpleIteratorStatus *status); static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status); static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status); static void cleanup_tempfile_(FILE **tempfile, char **tempfilename); static FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stats); static void set_file_stats_(const char *filename, struct flac_stat_s *stats); static int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence); static FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle); static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status); #ifdef FLAC__VALGRIND_TESTING static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream) { size_t ret = fwrite(ptr, size, nmemb, stream); if(!ferror(stream)) fflush(stream); return ret; } #else #define local__fwrite fwrite #endif /**************************************************************************** * * Level 0 implementation * ***************************************************************************/ static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data); static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data); static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); typedef struct { FLAC__bool got_error; FLAC__StreamMetadata *object; } level0_client_data; static FLAC__StreamMetadata *get_one_metadata_block_(const char *filename, FLAC__MetadataType type) { level0_client_data cd; FLAC__StreamDecoder *decoder; FLAC__ASSERT(0 != filename); cd.got_error = false; cd.object = 0; decoder = FLAC__stream_decoder_new(); if(0 == decoder) return 0; FLAC__stream_decoder_set_md5_checking(decoder, false); FLAC__stream_decoder_set_metadata_ignore_all(decoder); FLAC__stream_decoder_set_metadata_respond(decoder, type); if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &cd) != FLAC__STREAM_DECODER_INIT_STATUS_OK || cd.got_error) { (void)FLAC__stream_decoder_finish(decoder); FLAC__stream_decoder_delete(decoder); return 0; } if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder) || cd.got_error) { (void)FLAC__stream_decoder_finish(decoder); FLAC__stream_decoder_delete(decoder); if(0 != cd.object) FLAC__metadata_object_delete(cd.object); return 0; } (void)FLAC__stream_decoder_finish(decoder); FLAC__stream_decoder_delete(decoder); return cd.object; } FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo) { FLAC__StreamMetadata *object; FLAC__ASSERT(0 != filename); FLAC__ASSERT(0 != streaminfo); object = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_STREAMINFO); if (object) { /* can just copy the contents since STREAMINFO has no internal structure */ *streaminfo = *object; FLAC__metadata_object_delete(object); return true; } else { return false; } } FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags) { FLAC__ASSERT(0 != filename); FLAC__ASSERT(0 != tags); *tags = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_VORBIS_COMMENT); return 0 != *tags; } FLAC_API FLAC__bool FLAC__metadata_get_cuesheet(const char *filename, FLAC__StreamMetadata **cuesheet) { FLAC__ASSERT(0 != filename); FLAC__ASSERT(0 != cuesheet); *cuesheet = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_CUESHEET); return 0 != *cuesheet; } FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data) { (void)decoder, (void)frame, (void)buffer, (void)client_data; return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; } void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data) { level0_client_data *cd = (level0_client_data *)client_data; (void)decoder; /* * we assume we only get here when the one metadata block we were * looking for was passed to us */ if(!cd->got_error && 0 == cd->object) { if(0 == (cd->object = FLAC__metadata_object_clone(metadata))) cd->got_error = true; } } void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) { level0_client_data *cd = (level0_client_data *)client_data; (void)decoder; if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC) cd->got_error = true; } FLAC_API FLAC__bool FLAC__metadata_get_picture(const char *filename, FLAC__StreamMetadata **picture, FLAC__StreamMetadata_Picture_Type type, const char *mime_type, const FLAC__byte *description, uint32_t max_width, uint32_t max_height, uint32_t max_depth, uint32_t max_colors) { FLAC__Metadata_SimpleIterator *it; FLAC__uint64 max_area_seen = 0; FLAC__uint64 max_depth_seen = 0; FLAC__ASSERT(0 != filename); FLAC__ASSERT(0 != picture); *picture = 0; it = FLAC__metadata_simple_iterator_new(); if(0 == it) return false; if(!FLAC__metadata_simple_iterator_init(it, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) { FLAC__metadata_simple_iterator_delete(it); return false; } do { if(FLAC__metadata_simple_iterator_get_block_type(it) == FLAC__METADATA_TYPE_PICTURE) { FLAC__StreamMetadata *obj = FLAC__metadata_simple_iterator_get_block(it); FLAC__uint64 area = (FLAC__uint64)obj->data.picture.width * (FLAC__uint64)obj->data.picture.height; /* check constraints */ if( (type == (FLAC__StreamMetadata_Picture_Type)(-1) || type == obj->data.picture.type) && (mime_type == 0 || !strcmp(mime_type, obj->data.picture.mime_type)) && (description == 0 || !strcmp((const char *)description, (const char *)obj->data.picture.description)) && obj->data.picture.width <= max_width && obj->data.picture.height <= max_height && obj->data.picture.depth <= max_depth && obj->data.picture.colors <= max_colors && (area > max_area_seen || (area == max_area_seen && obj->data.picture.depth > max_depth_seen)) ) { if(*picture) FLAC__metadata_object_delete(*picture); *picture = obj; max_area_seen = area; max_depth_seen = obj->data.picture.depth; } else { FLAC__metadata_object_delete(obj); } } } while(FLAC__metadata_simple_iterator_next(it)); FLAC__metadata_simple_iterator_delete(it); return (0 != *picture); } /**************************************************************************** * * Level 1 implementation * ***************************************************************************/ #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4) /* 1 for initial offset, +4 for our own personal use */ struct FLAC__Metadata_SimpleIterator { FILE *file; char *filename, *tempfile_path_prefix; struct flac_stat_s stats; FLAC__bool has_stats; FLAC__bool is_writable; FLAC__Metadata_SimpleIteratorStatus status; FLAC__off_t offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH]; FLAC__off_t first_offset; /* this is the offset to the STREAMINFO block */ uint32_t depth; /* this is the metadata block header of the current block we are pointing to: */ FLAC__bool is_last; FLAC__MetadataType type; uint32_t length; }; FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[] = { "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR", "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR" }; FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new(void) { FLAC__Metadata_SimpleIterator *iterator = calloc(1, sizeof(FLAC__Metadata_SimpleIterator)); if(0 != iterator) { iterator->file = 0; iterator->filename = 0; iterator->tempfile_path_prefix = 0; iterator->has_stats = false; iterator->is_writable = false; iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; iterator->first_offset = iterator->offset[0] = -1; iterator->depth = 0; } return iterator; } static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(0 != iterator); if(0 != iterator->file) { fclose(iterator->file); iterator->file = 0; if(iterator->has_stats) set_file_stats_(iterator->filename, &iterator->stats); } if(0 != iterator->filename) { free(iterator->filename); iterator->filename = 0; } if(0 != iterator->tempfile_path_prefix) { free(iterator->tempfile_path_prefix); iterator->tempfile_path_prefix = 0; } } FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(0 != iterator); simple_iterator_free_guts_(iterator); free(iterator); } FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator) { FLAC__Metadata_SimpleIteratorStatus status; FLAC__ASSERT(0 != iterator); status = iterator->status; iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; return status; } static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool read_only) { uint32_t ret; FLAC__ASSERT(0 != iterator); if(read_only || 0 == (iterator->file = flac_fopen(iterator->filename, "r+b"))) { iterator->is_writable = false; if(read_only || errno == EACCES) { if(0 == (iterator->file = flac_fopen(iterator->filename, "rb"))) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE; return false; } } else { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE; return false; } } else { iterator->is_writable = true; } ret = seek_to_first_metadata_block_(iterator->file); switch(ret) { case 0: iterator->depth = 0; iterator->first_offset = iterator->offset[iterator->depth] = ftello(iterator->file); return read_metadata_block_header_(iterator); case 1: iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; return false; case 2: iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; case 3: iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE; return false; default: FLAC__ASSERT(0); return false; } } #if 0 @@@ If we decide to finish implementing this, put this comment back in metadata.h /* * The 'tempfile_path_prefix' allows you to specify a directory where * tempfiles should go. Remember that if your metadata edits cause the * FLAC file to grow, the entire file will have to be rewritten. If * 'tempfile_path_prefix' is NULL, the temp file will be written in the * same directory as the original FLAC file. This makes replacing the * original with the tempfile fast but requires extra space in the same * partition for the tempfile. If space is a problem, you can pass a * directory name belonging to a different partition in * 'tempfile_path_prefix'. Note that you should use the forward slash * '/' as the directory separator. A trailing slash is not needed; it * will be added automatically. */ FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix); #endif FLAC_API FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool read_only, FLAC__bool preserve_file_stats) { const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'flac_rename(...)' for what it will take to finish implementing this */ FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != filename); simple_iterator_free_guts_(iterator); if(!read_only && preserve_file_stats) iterator->has_stats = get_file_stats_(filename, &iterator->stats); if(0 == (iterator->filename = strdup(filename))) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; return false; } if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; return false; } return simple_iterator_prime_input_(iterator, read_only); } FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); return iterator->is_writable; } FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); if(iterator->is_last) return false; if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } iterator->offset[iterator->depth] = ftello(iterator->file); return read_metadata_block_header_(iterator); } FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator) { FLAC__off_t this_offset; FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); if(iterator->offset[iterator->depth] == iterator->first_offset) return false; if(0 != fseeko(iterator->file, iterator->first_offset, SEEK_SET)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } this_offset = iterator->first_offset; if(!read_metadata_block_header_(iterator)) return false; /* we ignore any error from ftello() and catch it in fseeko() */ while(ftello(iterator->file) + (FLAC__off_t)iterator->length < iterator->offset[iterator->depth]) { if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } this_offset = ftello(iterator->file); if(!read_metadata_block_header_(iterator)) return false; } iterator->offset[iterator->depth] = this_offset; return true; } /*@@@@add to tests*/ FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_last(const FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); return iterator->is_last; } /*@@@@add to tests*/ FLAC_API off_t FLAC__metadata_simple_iterator_get_block_offset(const FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); return iterator->offset[iterator->depth]; } FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); return iterator->type; } /*@@@@add to tests*/ FLAC_API uint32_t FLAC__metadata_simple_iterator_get_block_length(const FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); return iterator->length; } /*@@@@add to tests*/ FLAC_API FLAC__bool FLAC__metadata_simple_iterator_get_application_id(FLAC__Metadata_SimpleIterator *iterator, FLAC__byte *id) { const uint32_t id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8; FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); FLAC__ASSERT(0 != id); if(iterator->type != FLAC__METADATA_TYPE_APPLICATION) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT; return false; } if(fread(id, 1, id_bytes, iterator->file) != id_bytes) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; return false; } /* back up */ if(0 != fseeko(iterator->file, -((int)id_bytes), SEEK_CUR)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } return true; } FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator) { FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type); FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); if(0 != block) { block->is_last = iterator->is_last; block->length = iterator->length; if(!read_metadata_block_data_(iterator, block)) { FLAC__metadata_object_delete(block); return 0; } /* back up to the beginning of the block data to stay consistent */ if(0 != fseeko(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; FLAC__metadata_object_delete(block); return 0; } } else iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; return block; } FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding) { FLAC__ASSERT_DECLARATION(FLAC__off_t debug_target_offset = iterator->offset[iterator->depth];) FLAC__bool ret; FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); FLAC__ASSERT(0 != block); if(!iterator->is_writable) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE; return false; } if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) { if(iterator->type != block->type) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT; return false; } } block->is_last = iterator->is_last; if(iterator->length == block->length) return write_metadata_block_stationary_(iterator, block); else if(iterator->length > block->length) { if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) { ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last); FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset); FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); return ret; } else { ret = rewrite_whole_file_(iterator, block, /*append=*/false); FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset); FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); return ret; } } else /* iterator->length < block->length */ { uint32_t padding_leftover = 0; FLAC__bool padding_is_last = false; if(use_padding) { /* first see if we can even use padding */ if(iterator->is_last) { use_padding = false; } else { const uint32_t extra_padding_bytes_required = block->length - iterator->length; simple_iterator_push_(iterator); if(!FLAC__metadata_simple_iterator_next(iterator)) { (void)simple_iterator_pop_(iterator); return false; } if(iterator->type != FLAC__METADATA_TYPE_PADDING) { use_padding = false; } else { if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) { padding_leftover = 0; block->is_last = iterator->is_last; } else if(iterator->length < extra_padding_bytes_required) use_padding = false; else { padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required; padding_is_last = iterator->is_last; block->is_last = false; } } if(!simple_iterator_pop_(iterator)) return false; } } if(use_padding) { if(padding_leftover == 0) { ret = write_metadata_block_stationary_(iterator, block); FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset); FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); return ret; } else { FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH); ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last); FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset); FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); return ret; } } else { ret = rewrite_whole_file_(iterator, block, /*append=*/false); FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset); FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); return ret; } } } FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding) { uint32_t padding_leftover = 0; FLAC__bool padding_is_last = false; FLAC__ASSERT_DECLARATION(FLAC__off_t debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;) FLAC__bool ret; FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); FLAC__ASSERT(0 != block); if(!iterator->is_writable) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE; return false; } if(block->type == FLAC__METADATA_TYPE_STREAMINFO) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT; return false; } block->is_last = iterator->is_last; if(use_padding) { /* first see if we can even use padding */ if(iterator->is_last) { use_padding = false; } else { simple_iterator_push_(iterator); if(!FLAC__metadata_simple_iterator_next(iterator)) { (void)simple_iterator_pop_(iterator); return false; } if(iterator->type != FLAC__METADATA_TYPE_PADDING) { use_padding = false; } else { if(iterator->length == block->length) { padding_leftover = 0; block->is_last = iterator->is_last; } else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) use_padding = false; else { padding_leftover = iterator->length - block->length; padding_is_last = iterator->is_last; block->is_last = false; } } if(!simple_iterator_pop_(iterator)) return false; } } if(use_padding) { /* move to the next block, which is suitable padding */ if(!FLAC__metadata_simple_iterator_next(iterator)) return false; if(padding_leftover == 0) { ret = write_metadata_block_stationary_(iterator, block); FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset); FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); return ret; } else { FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH); ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last); FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset); FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); return ret; } } else { ret = rewrite_whole_file_(iterator, block, /*append=*/true); FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset); FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); return ret; } } FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding) { FLAC__ASSERT_DECLARATION(FLAC__off_t debug_target_offset = iterator->offset[iterator->depth];) FLAC__bool ret; if(!iterator->is_writable) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE; return false; } if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT; return false; } if(use_padding) { FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING); if(0 == padding) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; return false; } padding->length = iterator->length; if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) { FLAC__metadata_object_delete(padding); return false; } FLAC__metadata_object_delete(padding); if(!FLAC__metadata_simple_iterator_prev(iterator)) return false; FLAC__ASSERT(iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length == debug_target_offset); FLAC__ASSERT(ftello(iterator->file) + (FLAC__off_t)iterator->length == debug_target_offset); return true; } else { ret = rewrite_whole_file_(iterator, 0, /*append=*/false); FLAC__ASSERT(iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length == debug_target_offset); FLAC__ASSERT(ftello(iterator->file) + (FLAC__off_t)iterator->length == debug_target_offset); return ret; } } /**************************************************************************** * * Level 2 implementation * ***************************************************************************/ typedef struct FLAC__Metadata_Node { FLAC__StreamMetadata *data; struct FLAC__Metadata_Node *prev, *next; } FLAC__Metadata_Node; struct FLAC__Metadata_Chain { char *filename; /* will be NULL if using callbacks */ FLAC__bool is_ogg; FLAC__Metadata_Node *head; FLAC__Metadata_Node *tail; uint32_t nodes; FLAC__Metadata_ChainStatus status; FLAC__off_t first_offset, last_offset; /* * This is the length of the chain initially read from the FLAC file. * it is used to compare against the current length to decide whether * or not the whole file has to be rewritten. */ FLAC__off_t initial_length; /* @@@ hacky, these are currently only needed by ogg reader */ FLAC__IOHandle handle; FLAC__IOCallback_Read read_cb; }; struct FLAC__Metadata_Iterator { FLAC__Metadata_Chain *chain; FLAC__Metadata_Node *current; }; FLAC_API const char * const FLAC__Metadata_ChainStatusString[] = { "FLAC__METADATA_CHAIN_STATUS_OK", "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT", "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE", "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE", "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE", "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA", "FLAC__METADATA_CHAIN_STATUS_READ_ERROR", "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR", "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR", "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR", "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR", "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR", "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR", "FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS", "FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH", "FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL" }; static FLAC__Metadata_Node *node_new_(void) { return calloc(1, sizeof(FLAC__Metadata_Node)); } static void node_delete_(FLAC__Metadata_Node *node) { FLAC__ASSERT(0 != node); if(0 != node->data) FLAC__metadata_object_delete(node->data); free(node); } static void chain_init_(FLAC__Metadata_Chain *chain) { FLAC__ASSERT(0 != chain); chain->filename = 0; chain->is_ogg = false; chain->head = chain->tail = 0; chain->nodes = 0; chain->status = FLAC__METADATA_CHAIN_STATUS_OK; chain->initial_length = 0; chain->read_cb = 0; } static void chain_clear_(FLAC__Metadata_Chain *chain) { FLAC__Metadata_Node *node, *next; FLAC__ASSERT(0 != chain); for(node = chain->head; node; ) { next = node->next; node_delete_(node); node = next; } if(0 != chain->filename) free(chain->filename); chain_init_(chain); } static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node) { FLAC__ASSERT(0 != chain); FLAC__ASSERT(0 != node); FLAC__ASSERT(0 != node->data); node->next = node->prev = 0; node->data->is_last = true; if(0 != chain->tail) chain->tail->data->is_last = false; if(0 == chain->head) chain->head = node; else { FLAC__ASSERT(0 != chain->tail); chain->tail->next = node; node->prev = chain->tail; } chain->tail = node; chain->nodes++; } static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node) { FLAC__ASSERT(0 != chain); FLAC__ASSERT(0 != node); if(node == chain->head) chain->head = node->next; else node->prev->next = node->next; if(node == chain->tail) chain->tail = node->prev; else node->next->prev = node->prev; if(0 != chain->tail) chain->tail->data->is_last = true; chain->nodes--; } static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node) { chain_remove_node_(chain, node); node_delete_(node); } static FLAC__off_t chain_calculate_length_(FLAC__Metadata_Chain *chain) { const FLAC__Metadata_Node *node; FLAC__off_t length = 0; for(node = chain->head; node; node = node->next) length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length); return length; } static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node) { FLAC__ASSERT(0 != node); FLAC__ASSERT(0 != node->data); FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->current); FLAC__ASSERT(0 != iterator->chain); FLAC__ASSERT(0 != iterator->chain->head); FLAC__ASSERT(0 != iterator->chain->tail); node->data->is_last = false; node->prev = iterator->current->prev; node->next = iterator->current; if(0 == node->prev) iterator->chain->head = node; else node->prev->next = node; iterator->current->prev = node; iterator->chain->nodes++; } static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node) { FLAC__ASSERT(0 != node); FLAC__ASSERT(0 != node->data); FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->current); FLAC__ASSERT(0 != iterator->chain); FLAC__ASSERT(0 != iterator->chain->head); FLAC__ASSERT(0 != iterator->chain->tail); iterator->current->data->is_last = false; node->prev = iterator->current; node->next = iterator->current->next; if(0 == node->next) iterator->chain->tail = node; else node->next->prev = node; node->prev->next = node; iterator->chain->tail->data->is_last = true; iterator->chain->nodes++; } /* return true iff node and node->next are both padding */ static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node) { if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) { const uint32_t growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length; node->data->length += growth; /* new block size can be greater than max metadata block size, but it'll be fixed later in chain_prepare_for_write_() */ chain_delete_node_(chain, node->next); return true; } else return false; } /* Returns the new length of the chain, or 0 if there was an error. */ /* WATCHOUT: This can get called multiple times before a write, so * it should still work when this happens. */ /* WATCHOUT: Make sure to also update the logic in * FLAC__metadata_chain_check_if_tempfile_needed() if the logic here changes. */ static FLAC__off_t chain_prepare_for_write_(FLAC__Metadata_Chain *chain, FLAC__bool use_padding) { FLAC__off_t current_length = chain_calculate_length_(chain); if(use_padding) { /* if the metadata shrank and the last block is padding, we just extend the last padding block */ if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) { const FLAC__off_t delta = chain->initial_length - current_length; chain->tail->data->length += delta; current_length += delta; FLAC__ASSERT(current_length == chain->initial_length); } /* if the metadata shrank more than 4 bytes then there's room to add another padding block */ else if(current_length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) { FLAC__StreamMetadata *padding; FLAC__Metadata_Node *node; if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) { chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; return 0; } padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length); if(0 == (node = node_new_())) { FLAC__metadata_object_delete(padding); chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; return 0; } node->data = padding; chain_append_node_(chain, node); current_length = chain_calculate_length_(chain); FLAC__ASSERT(current_length == chain->initial_length); } /* if the metadata grew but the last block is padding, try cutting the padding to restore the original length so we don't have to rewrite the whole file */ else if(current_length > chain->initial_length) { const FLAC__off_t delta = current_length - chain->initial_length; if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) { /* if the delta is exactly the size of the last padding block, remove the padding block */ if((FLAC__off_t)chain->tail->data->length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta) { chain_delete_node_(chain, chain->tail); current_length = chain_calculate_length_(chain); FLAC__ASSERT(current_length == chain->initial_length); } /* if there is at least 'delta' bytes of padding, trim the padding down */ else if((FLAC__off_t)chain->tail->data->length >= delta) { chain->tail->data->length -= delta; current_length -= delta; FLAC__ASSERT(current_length == chain->initial_length); } } } } /* check sizes of all metadata blocks; reduce padding size if necessary */ { FLAC__Metadata_Node *node; for (node = chain->head; node; node = node->next) { if(node->data->length >= (1u << FLAC__STREAM_METADATA_LENGTH_LEN)) { if(node->data->type == FLAC__METADATA_TYPE_PADDING) { node->data->length = (1u << FLAC__STREAM_METADATA_LENGTH_LEN) - 1; current_length = chain_calculate_length_(chain); } else { chain->status = FLAC__METADATA_CHAIN_STATUS_BAD_METADATA; return 0; } } } } return current_length; } static FLAC__bool chain_read_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__IOCallback_Tell tell_cb) { FLAC__Metadata_Node *node; FLAC__ASSERT(0 != chain); /* we assume we're already at the beginning of the file */ switch(seek_to_first_metadata_block_cb_(handle, read_cb, seek_cb)) { case 0: break; case 1: chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR; return false; case 2: chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; return false; case 3: chain->status = FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE; return false; default: FLAC__ASSERT(0); return false; } { FLAC__int64 pos = tell_cb(handle); if(pos < 0) { chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR; return false; } chain->first_offset = (FLAC__off_t)pos; } { FLAC__bool is_last; FLAC__MetadataType type; uint32_t length; do { node = node_new_(); if(0 == node) { chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; return false; } if(!read_metadata_block_header_cb_(handle, read_cb, &is_last, &type, &length)) { node_delete_(node); chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR; return false; } node->data = FLAC__metadata_object_new(type); if(0 == node->data) { node_delete_(node); chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; return false; } node->data->is_last = is_last; node->data->length = length; chain->status = get_equivalent_status_(read_metadata_block_data_cb_(handle, read_cb, seek_cb, node->data)); if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) { node_delete_(node); return false; } chain_append_node_(chain, node); } while(!is_last); } { FLAC__int64 pos = tell_cb(handle); if(pos < 0) { chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR; return false; } chain->last_offset = (FLAC__off_t)pos; } chain->initial_length = chain_calculate_length_(chain); return true; } static FLAC__StreamDecoderReadStatus chain_read_ogg_read_cb_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data) { FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data; (void)decoder; if(*bytes > 0 && chain->status == FLAC__METADATA_CHAIN_STATUS_OK) { *bytes = chain->read_cb(buffer, sizeof(FLAC__byte), *bytes, chain->handle); if(*bytes == 0) return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; else return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; } else return FLAC__STREAM_DECODER_READ_STATUS_ABORT; } static FLAC__StreamDecoderWriteStatus chain_read_ogg_write_cb_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data) { (void)decoder, (void)frame, (void)buffer, (void)client_data; return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; } static void chain_read_ogg_metadata_cb_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data) { FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data; FLAC__Metadata_Node *node; (void)decoder; node = node_new_(); if(0 == node) { chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; return; } node->data = FLAC__metadata_object_clone(metadata); if(0 == node->data) { node_delete_(node); chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; return; } chain_append_node_(chain, node); } static void chain_read_ogg_error_cb_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) { FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data; (void)decoder, (void)status; chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */ } static FLAC__bool chain_read_ogg_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb) { FLAC__StreamDecoder *decoder; FLAC__ASSERT(0 != chain); /* we assume we're already at the beginning of the file */ chain->handle = handle; chain->read_cb = read_cb; if(0 == (decoder = FLAC__stream_decoder_new())) { chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; return false; } FLAC__stream_decoder_set_metadata_respond_all(decoder); if(FLAC__stream_decoder_init_ogg_stream(decoder, chain_read_ogg_read_cb_, /*seek_callback=*/0, /*tell_callback=*/0, /*length_callback=*/0, /*eof_callback=*/0, chain_read_ogg_write_cb_, chain_read_ogg_metadata_cb_, chain_read_ogg_error_cb_, chain) != FLAC__STREAM_DECODER_INIT_STATUS_OK) { FLAC__stream_decoder_delete(decoder); chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */ return false; } chain->first_offset = 0; /*@@@ wrong; will need to be set correctly to implement metadata writing for Ogg FLAC */ if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */ if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) { FLAC__stream_decoder_delete(decoder); return false; } FLAC__stream_decoder_delete(decoder); chain->last_offset = 0; /*@@@ wrong; will need to be set correctly to implement metadata writing for Ogg FLAC */ chain->initial_length = chain_calculate_length_(chain); return true; } static FLAC__bool chain_rewrite_metadata_in_place_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, FLAC__IOCallback_Seek seek_cb) { FLAC__Metadata_Node *node; FLAC__ASSERT(0 != chain); FLAC__ASSERT(0 != chain->head); if(0 != seek_cb(handle, chain->first_offset, SEEK_SET)) { chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; return false; } for(node = chain->head; node; node = node->next) { if(!write_metadata_block_header_cb_(handle, write_cb, node->data)) { chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR; return false; } if(!write_metadata_block_data_cb_(handle, write_cb, node->data)) { chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR; return false; } } /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/ chain->status = FLAC__METADATA_CHAIN_STATUS_OK; return true; } static FLAC__bool chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain *chain) { FILE *file; FLAC__bool ret; FLAC__ASSERT(0 != chain->filename); if(0 == (file = flac_fopen(chain->filename, "r+b"))) { chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE; return false; } /* chain_rewrite_metadata_in_place_cb_() sets chain->status for us */ ret = chain_rewrite_metadata_in_place_cb_(chain, (FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, fseek_wrapper_); fclose(file); return ret; } static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix) { FILE *f, *tempfile = NULL; char *tempfilename; FLAC__Metadata_SimpleIteratorStatus status; const FLAC__Metadata_Node *node; FLAC__ASSERT(0 != chain); FLAC__ASSERT(0 != chain->filename); FLAC__ASSERT(0 != chain->head); /* copy the file prefix (data up to first metadata block */ if(0 == (f = flac_fopen(chain->filename, "rb"))) { chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE; return false; } if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) { chain->status = get_equivalent_status_(status); goto err; } if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) { chain->status = get_equivalent_status_(status); goto err; } /* write the metadata */ for(node = chain->head; node; node = node->next) { if(!write_metadata_block_header_(tempfile, &status, node->data)) { chain->status = get_equivalent_status_(status); goto err; } if(!write_metadata_block_data_(tempfile, &status, node->data)) { chain->status = get_equivalent_status_(status); goto err; } } /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/ /* copy the file postfix (everything after the metadata) */ if(0 != fseeko(f, chain->last_offset, SEEK_SET)) { chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; goto err; } if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) { chain->status = get_equivalent_status_(status); goto err; } /* move the tempfile on top of the original */ (void)fclose(f); if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status)) return false; return true; err: (void)fclose(f); cleanup_tempfile_(&tempfile, &tempfilename); return false; } /* assumes 'handle' is already at beginning of file */ static FLAC__bool chain_rewrite_file_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb) { FLAC__Metadata_SimpleIteratorStatus status; const FLAC__Metadata_Node *node; FLAC__ASSERT(0 != chain); FLAC__ASSERT(0 == chain->filename); FLAC__ASSERT(0 != chain->head); /* copy the file prefix (data up to first metadata block */ if(!copy_n_bytes_from_file_cb_(handle, read_cb, temp_handle, temp_write_cb, chain->first_offset, &status)) { chain->status = get_equivalent_status_(status); return false; } /* write the metadata */ for(node = chain->head; node; node = node->next) { if(!write_metadata_block_header_cb_(temp_handle, temp_write_cb, node->data)) { chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR; return false; } if(!write_metadata_block_data_cb_(temp_handle, temp_write_cb, node->data)) { chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR; return false; } } /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/ /* copy the file postfix (everything after the metadata) */ if(0 != seek_cb(handle, chain->last_offset, SEEK_SET)) { chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; return false; } if(!copy_remaining_bytes_from_file_cb_(handle, read_cb, eof_cb, temp_handle, temp_write_cb, &status)) { chain->status = get_equivalent_status_(status); return false; } return true; } FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new(void) { FLAC__Metadata_Chain *chain = calloc(1, sizeof(FLAC__Metadata_Chain)); if(0 != chain) chain_init_(chain); return chain; } FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain) { FLAC__ASSERT(0 != chain); chain_clear_(chain); free(chain); } FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain) { FLAC__Metadata_ChainStatus status; FLAC__ASSERT(0 != chain); status = chain->status; chain->status = FLAC__METADATA_CHAIN_STATUS_OK; return status; } static FLAC__bool chain_read_(FLAC__Metadata_Chain *chain, const char *filename, FLAC__bool is_ogg) { FILE *file; FLAC__bool ret; FLAC__ASSERT(0 != chain); FLAC__ASSERT(0 != filename); chain_clear_(chain); if(0 == (chain->filename = strdup(filename))) { chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; return false; } chain->is_ogg = is_ogg; if(0 == (file = flac_fopen(filename, "rb"))) { chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE; return false; } /* the function also sets chain->status for us */ ret = is_ogg? chain_read_ogg_cb_(chain, file, (FLAC__IOCallback_Read)fread) : chain_read_cb_(chain, file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, ftell_wrapper_) ; fclose(file); return ret; } FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename) { return chain_read_(chain, filename, /*is_ogg=*/false); } /*@@@@add to tests*/ FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg(FLAC__Metadata_Chain *chain, const char *filename) { return chain_read_(chain, filename, /*is_ogg=*/true); } static FLAC__bool chain_read_with_callbacks_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__bool is_ogg) { FLAC__bool ret; FLAC__ASSERT(0 != chain); chain_clear_(chain); if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.tell) { chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS; return false; } chain->is_ogg = is_ogg; /* rewind */ if(0 != callbacks.seek(handle, 0, SEEK_SET)) { chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; return false; } /* the function also sets chain->status for us */ ret = is_ogg? chain_read_ogg_cb_(chain, handle, callbacks.read) : chain_read_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.tell) ; return ret; } FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks) { return chain_read_with_callbacks_(chain, handle, callbacks, /*is_ogg=*/false); } /*@@@@add to tests*/ FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks) { return chain_read_with_callbacks_(chain, handle, callbacks, /*is_ogg=*/true); } typedef enum { LBS_NONE = 0, LBS_SIZE_CHANGED, LBS_BLOCK_ADDED, LBS_BLOCK_REMOVED } LastBlockState; FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding) { /* This does all the same checks that are in chain_prepare_for_write_() * but doesn't actually alter the chain. Make sure to update the logic * here if chain_prepare_for_write_() changes. */ FLAC__off_t current_length; LastBlockState lbs_state = LBS_NONE; uint32_t lbs_size = 0; FLAC__ASSERT(0 != chain); current_length = chain_calculate_length_(chain); if(use_padding) { const FLAC__Metadata_Node * const node = chain->tail; /* if the metadata shrank and the last block is padding, we just extend the last padding block */ if(current_length < chain->initial_length && node->data->type == FLAC__METADATA_TYPE_PADDING) { lbs_state = LBS_SIZE_CHANGED; lbs_size = node->data->length + (chain->initial_length - current_length); } /* if the metadata shrank more than 4 bytes then there's room to add another padding block */ else if(current_length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) { lbs_state = LBS_BLOCK_ADDED; lbs_size = chain->initial_length - (current_length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); } /* if the metadata grew but the last block is padding, try cutting the padding to restore the original length so we don't have to rewrite the whole file */ else if(current_length > chain->initial_length) { const FLAC__off_t delta = current_length - chain->initial_length; if(node->data->type == FLAC__METADATA_TYPE_PADDING) { /* if the delta is exactly the size of the last padding block, remove the padding block */ if((FLAC__off_t)node->data->length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta) { lbs_state = LBS_BLOCK_REMOVED; lbs_size = 0; } /* if there is at least 'delta' bytes of padding, trim the padding down */ else if((FLAC__off_t)node->data->length >= delta) { lbs_state = LBS_SIZE_CHANGED; lbs_size = node->data->length - delta; } } } } current_length = 0; /* check sizes of all metadata blocks; reduce padding size if necessary */ { const FLAC__Metadata_Node *node; for(node = chain->head; node; node = node->next) { uint32_t block_len = node->data->length; if(node == chain->tail) { if(lbs_state == LBS_BLOCK_REMOVED) continue; else if(lbs_state == LBS_SIZE_CHANGED) block_len = lbs_size; } if(block_len >= (1u << FLAC__STREAM_METADATA_LENGTH_LEN)) { if(node->data->type == FLAC__METADATA_TYPE_PADDING) block_len = (1u << FLAC__STREAM_METADATA_LENGTH_LEN) - 1; else return false /* the return value doesn't matter */; } current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + block_len); } if(lbs_state == LBS_BLOCK_ADDED) { /* test added padding block */ uint32_t block_len = lbs_size; if(block_len >= (1u << FLAC__STREAM_METADATA_LENGTH_LEN)) block_len = (1u << FLAC__STREAM_METADATA_LENGTH_LEN) - 1; current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + block_len); } } return (current_length != chain->initial_length); } FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats) { struct flac_stat_s stats; const char *tempfile_path_prefix = 0; FLAC__off_t current_length; FLAC__ASSERT(0 != chain); if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */ chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; return false; } if (0 == chain->filename) { chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH; return false; } current_length = chain_prepare_for_write_(chain, use_padding); /* a return value of 0 means there was an error; chain->status is already set */ if (0 == current_length) return false; if(preserve_file_stats) get_file_stats_(chain->filename, &stats); if(current_length == chain->initial_length) { if(!chain_rewrite_metadata_in_place_(chain)) return false; } else { if(!chain_rewrite_file_(chain, tempfile_path_prefix)) return false; /* recompute lengths and offsets */ { const FLAC__Metadata_Node *node; chain->initial_length = current_length; chain->last_offset = chain->first_offset; for(node = chain->head; node; node = node->next) chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length); } } if(preserve_file_stats) set_file_stats_(chain->filename, &stats); return true; } FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks) { FLAC__off_t current_length; FLAC__ASSERT(0 != chain); if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */ chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; return false; } if (0 != chain->filename) { chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH; return false; } if (0 == callbacks.write || 0 == callbacks.seek) { chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS; return false; } if (FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) { chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL; return false; } current_length = chain_prepare_for_write_(chain, use_padding); /* a return value of 0 means there was an error; chain->status is already set */ if (0 == current_length) return false; FLAC__ASSERT(current_length == chain->initial_length); return chain_rewrite_metadata_in_place_cb_(chain, handle, callbacks.write, callbacks.seek); } FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks_and_tempfile(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__IOHandle temp_handle, FLAC__IOCallbacks temp_callbacks) { FLAC__off_t current_length; FLAC__ASSERT(0 != chain); if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */ chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; return false; } if (0 != chain->filename) { chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH; return false; } if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.eof) { chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS; return false; } if (0 == temp_callbacks.write) { chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS; return false; } if (!FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) { chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL; return false; } current_length = chain_prepare_for_write_(chain, use_padding); /* a return value of 0 means there was an error; chain->status is already set */ if (0 == current_length) return false; FLAC__ASSERT(current_length != chain->initial_length); /* rewind */ if(0 != callbacks.seek(handle, 0, SEEK_SET)) { chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; return false; } if(!chain_rewrite_file_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.eof, temp_handle, temp_callbacks.write)) return false; /* recompute lengths and offsets */ { const FLAC__Metadata_Node *node; chain->initial_length = current_length; chain->last_offset = chain->first_offset; for(node = chain->head; node; node = node->next) chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length); } return true; } FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain) { FLAC__Metadata_Node *node; FLAC__ASSERT(0 != chain); for(node = chain->head; node; ) { if(!chain_merge_adjacent_padding_(chain, node)) node = node->next; } } FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain) { FLAC__Metadata_Node *node, *save; uint32_t i; FLAC__ASSERT(0 != chain); /* * Don't try and be too smart... this simple algo is good enough for * the small number of nodes that we deal with. */ for(i = 0, node = chain->head; i < chain->nodes; i++) { if(node->data->type == FLAC__METADATA_TYPE_PADDING) { save = node->next; chain_remove_node_(chain, node); chain_append_node_(chain, node); node = save; } else { node = node->next; } } FLAC__metadata_chain_merge_padding(chain); } FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new(void) { FLAC__Metadata_Iterator *iterator = calloc(1, sizeof(FLAC__Metadata_Iterator)); /* calloc() implies: iterator->current = 0; iterator->chain = 0; */ return iterator; } FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator) { FLAC__ASSERT(0 != iterator); free(iterator); } FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != chain); FLAC__ASSERT(0 != chain->head); iterator->chain = chain; iterator->current = chain->head; } FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator) { FLAC__ASSERT(0 != iterator); if(0 == iterator->current || 0 == iterator->current->next) return false; iterator->current = iterator->current->next; return true; } FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator) { FLAC__ASSERT(0 != iterator); if(0 == iterator->current || 0 == iterator->current->prev) return false; iterator->current = iterator->current->prev; return true; } FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->current); FLAC__ASSERT(0 != iterator->current->data); return iterator->current->data->type; } FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->current); return iterator->current->data; } FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != block); return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block); } FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding) { FLAC__Metadata_Node *save; FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->current); if(0 == iterator->current->prev) { FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO); return false; } save = iterator->current->prev; if(replace_with_padding) { FLAC__metadata_object_delete_data(iterator->current->data); iterator->current->data->type = FLAC__METADATA_TYPE_PADDING; } else { chain_delete_node_(iterator->chain, iterator->current); } iterator->current = save; return true; } FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block) { FLAC__Metadata_Node *node; FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->current); FLAC__ASSERT(0 != block); if(block->type == FLAC__METADATA_TYPE_STREAMINFO) return false; if(0 == iterator->current->prev) { FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO); return false; } if(0 == (node = node_new_())) return false; node->data = block; iterator_insert_node_(iterator, node); iterator->current = node; return true; } FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block) { FLAC__Metadata_Node *node; FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->current); FLAC__ASSERT(0 != block); if(block->type == FLAC__METADATA_TYPE_STREAMINFO) return false; if(0 == (node = node_new_())) return false; node->data = block; iterator_insert_node_after_(iterator, node); iterator->current = node; return true; } /**************************************************************************** * * Local function definitions * ***************************************************************************/ void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, uint32_t bytes) { uint32_t i; b += bytes; for(i = 0; i < bytes; i++) { *(--b) = (FLAC__byte)(val & 0xff); val >>= 8; } } void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, uint32_t bytes) { uint32_t i; for(i = 0; i < bytes; i++) { *(b++) = (FLAC__byte)(val & 0xff); val >>= 8; } } void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, uint32_t bytes) { uint32_t i; b += bytes; for(i = 0; i < bytes; i++) { *(--b) = (FLAC__byte)(val & 0xff); val >>= 8; } } FLAC__uint32 unpack_uint32_(FLAC__byte *b, uint32_t bytes) { FLAC__uint32 ret = 0; uint32_t i; for(i = 0; i < bytes; i++) ret = (ret << 8) | (FLAC__uint32)(*b++); return ret; } FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, uint32_t bytes) { FLAC__uint32 ret = 0; uint32_t i; b += bytes; for(i = 0; i < bytes; i++) ret = (ret << 8) | (FLAC__uint32)(*--b); return ret; } FLAC__uint64 unpack_uint64_(FLAC__byte *b, uint32_t bytes) { FLAC__uint64 ret = 0; uint32_t i; for(i = 0; i < bytes; i++) ret = (ret << 8) | (FLAC__uint64)(*b++); return ret; } FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); if(!read_metadata_block_header_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, &iterator->is_last, &iterator->type, &iterator->length)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; return false; } return true; } FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block) { FLAC__ASSERT(0 != iterator); FLAC__ASSERT(0 != iterator->file); iterator->status = read_metadata_block_data_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, block); return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK); } FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, uint32_t *length) { FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH]; if(read_cb(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH) return false; *is_last = raw_header[0] & 0x80? true : false; *type = (FLAC__MetadataType)(raw_header[0] & 0x7f); *length = unpack_uint32_(raw_header + 1, 3); /* Note that we don't check: * if(iterator->type >= FLAC__METADATA_TYPE_UNDEFINED) * we just will read in an opaque block */ return true; } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block) { switch(block->type) { case FLAC__METADATA_TYPE_STREAMINFO: return read_metadata_block_data_streaminfo_cb_(handle, read_cb, &block->data.stream_info); case FLAC__METADATA_TYPE_PADDING: return read_metadata_block_data_padding_cb_(handle, seek_cb, &block->data.padding, block->length); case FLAC__METADATA_TYPE_APPLICATION: return read_metadata_block_data_application_cb_(handle, read_cb, &block->data.application, block->length); case FLAC__METADATA_TYPE_SEEKTABLE: return read_metadata_block_data_seektable_cb_(handle, read_cb, &block->data.seek_table, block->length); case FLAC__METADATA_TYPE_VORBIS_COMMENT: return read_metadata_block_data_vorbis_comment_cb_(handle, read_cb, seek_cb, &block->data.vorbis_comment, block->length); case FLAC__METADATA_TYPE_CUESHEET: return read_metadata_block_data_cuesheet_cb_(handle, read_cb, &block->data.cue_sheet); case FLAC__METADATA_TYPE_PICTURE: return read_metadata_block_data_picture_cb_(handle, read_cb, &block->data.picture); default: return read_metadata_block_data_unknown_cb_(handle, read_cb, &block->data.unknown, block->length); } } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block) { FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b; if(read_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; b = buffer; /* we are using hardcoded numbers for simplicity but we should * probably eventually write a bit-level unpacker and use the * _STREAMINFO_ constants. */ block->min_blocksize = unpack_uint32_(b, 2); b += 2; block->max_blocksize = unpack_uint32_(b, 2); b += 2; block->min_framesize = unpack_uint32_(b, 3); b += 3; block->max_framesize = unpack_uint32_(b, 3); b += 3; block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((uint32_t)(b[2] & 0xf0) >> 4); block->channels = (uint32_t)((b[2] & 0x0e) >> 1) + 1; block->bits_per_sample = ((((uint32_t)(b[2] & 0x01)) << 4) | (((uint32_t)(b[3] & 0xf0)) >> 4)) + 1; block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4); memcpy(block->md5sum, b+8, 16); return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, uint32_t block_length) { (void)block; /* nothing to do; we don't care about reading the padding bytes */ if(0 != seek_cb(handle, block_length, SEEK_CUR)) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, uint32_t block_length) { const uint32_t id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8; if(read_cb(block->id, 1, id_bytes, handle) != id_bytes) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; if(block_length < id_bytes) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; block_length -= id_bytes; if(block_length == 0) { block->data = 0; } else { if(0 == (block->data = malloc(block_length))) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; if(read_cb(block->data, 1, block_length, handle) != block_length) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; } return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, uint32_t block_length) { uint32_t i; FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH]; FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0); block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH; if(block->num_points == 0) block->points = 0; else if(0 == (block->points = safe_malloc_mul_2op_p(block->num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint)))) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; for(i = 0; i < block->num_points; i++) { if(read_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; /* some MAGIC NUMBERs here */ block->points[i].sample_number = unpack_uint64_(buffer, 8); block->points[i].stream_offset = unpack_uint64_(buffer+8, 8); block->points[i].frame_samples = unpack_uint32_(buffer+16, 2); } return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry, uint32_t max_length) { const uint32_t entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8; FLAC__byte buffer[4]; /* magic number is asserted below */ FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == sizeof(buffer)); if(max_length < entry_length_len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA; max_length -= entry_length_len; if(read_cb(buffer, 1, entry_length_len, handle) != entry_length_len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; entry->length = unpack_uint32_little_endian_(buffer, entry_length_len); if(max_length < entry->length) { entry->length = 0; return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA; } else max_length -= entry->length; if(0 != entry->entry) free(entry->entry); if(entry->length == 0) { entry->entry = 0; } else { if(0 == (entry->entry = safe_malloc_add_2op_(entry->length, /*+*/1))) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; if(read_cb(entry->entry, 1, entry->length, handle) != entry->length) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; entry->entry[entry->length] = '\0'; } return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_VorbisComment *block, uint32_t block_length) { uint32_t i; FLAC__Metadata_SimpleIteratorStatus status; const uint32_t num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8; FLAC__byte buffer[4]; /* magic number is asserted below */ FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == sizeof(buffer)); status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, &(block->vendor_string), block_length); if(block_length >= 4) block_length -= 4; if(status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA) goto skip; else if(status != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) return status; block_length -= block->vendor_string.length; if(block_length < num_comments_len) goto skip; else block_length -= num_comments_len; if(read_cb(buffer, 1, num_comments_len, handle) != num_comments_len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len); if(block->num_comments == 0) { block->comments = 0; } else if(0 == (block->comments = calloc(block->num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) { block->num_comments = 0; return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; } for(i = 0; i < block->num_comments; i++) { status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, block->comments + i, block_length); if(block_length >= 4) block_length -= 4; if(status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA) { block->num_comments = i; goto skip; } else if(status != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) return status; block_length -= block->comments[i].length; } skip: if(block_length > 0) { /* bad metadata */ if(0 != seek_cb(handle, block_length, SEEK_CUR)) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; } return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track) { uint32_t i, len; FLAC__byte buffer[32]; /* asserted below that this is big enough */ FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64)); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8); FLAC__ASSERT(sizeof(buffer) >= (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8); FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; track->offset = unpack_uint64_(buffer, len); FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; track->number = (FLAC__byte)unpack_uint32_(buffer, len); FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8; if(read_cb(track->isrc, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) % 8 == 0); len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN == 1); FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN == 1); track->type = buffer[0] >> 7; track->pre_emphasis = (buffer[0] >> 6) & 1; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; track->num_indices = (FLAC__byte)unpack_uint32_(buffer, len); if(track->num_indices == 0) { track->indices = 0; } else if(0 == (track->indices = calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; for(i = 0; i < track->num_indices; i++) { FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; track->indices[i].offset = unpack_uint64_(buffer, len); FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; track->indices[i].number = (FLAC__byte)unpack_uint32_(buffer, len); FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; } return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block) { uint32_t i, len; FLAC__Metadata_SimpleIteratorStatus status; FLAC__byte buffer[1024]; /* MSVC needs a constant expression so we put a magic number and assert */ FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)/8 <= sizeof(buffer)); FLAC__ASSERT(sizeof(FLAC__uint64) <= sizeof(buffer)); FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8; if(read_cb(block->media_catalog_number, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; block->lead_in = unpack_uint64_(buffer, len); FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0); len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; block->is_cd = buffer[0]&0x80? true : false; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; block->num_tracks = unpack_uint32_(buffer, len); if(block->num_tracks == 0) { block->tracks = 0; } else if(0 == (block->tracks = calloc(block->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; for(i = 0; i < block->num_tracks; i++) { if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_cuesheet_track_cb_(handle, read_cb, block->tracks + i))) return status; } return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cstring_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__byte **data, FLAC__uint32 *length, FLAC__uint32 length_len) { FLAC__byte buffer[sizeof(FLAC__uint32)]; FLAC__ASSERT(0 != data); FLAC__ASSERT(length_len%8 == 0); length_len /= 8; /* convert to bytes */ FLAC__ASSERT(sizeof(buffer) >= length_len); if(read_cb(buffer, 1, length_len, handle) != length_len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; *length = unpack_uint32_(buffer, length_len); if(0 != *data) free(*data); if(0 == (*data = safe_malloc_add_2op_(*length, /*+*/1))) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; if(*length > 0) { if(read_cb(*data, 1, *length, handle) != *length) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; } (*data)[*length] = '\0'; return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block) { FLAC__Metadata_SimpleIteratorStatus status; FLAC__byte buffer[4]; /* asserted below that this is big enough */ FLAC__uint32 len; FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8); FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_TYPE_LEN % 8 == 0); len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; block->type = (FLAC__StreamMetadata_Picture_Type)unpack_uint32_(buffer, len); if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, (FLAC__byte**)(&(block->mime_type)), &len, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) return status; if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, &(block->description), &len, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) return status; FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN % 8 == 0); len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; block->width = unpack_uint32_(buffer, len); FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN % 8 == 0); len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; block->height = unpack_uint32_(buffer, len); FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN % 8 == 0); len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; block->depth = unpack_uint32_(buffer, len); FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_COLORS_LEN % 8 == 0); len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN / 8; if(read_cb(buffer, 1, len, handle) != len) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; block->colors = unpack_uint32_(buffer, len); /* for convenience we use read_metadata_block_data_picture_cstring_cb_() even though it adds an extra terminating NUL we don't use */ if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, &(block->data), &(block->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) return status; return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, uint32_t block_length) { if(block_length == 0) { block->data = 0; } else { if(0 == (block->data = malloc(block_length))) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; if(read_cb(block->data, 1, block_length, handle) != block_length) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; } return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; } FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block) { FLAC__ASSERT(0 != file); FLAC__ASSERT(0 != status); if(!write_metadata_block_header_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; return false; } return true; } FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block) { FLAC__ASSERT(0 != file); FLAC__ASSERT(0 != status); if (write_metadata_block_data_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; return true; } else { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; return false; } } FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block) { FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH]; FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN)); /* double protection */ if(block->length >= (1u << FLAC__STREAM_METADATA_LENGTH_LEN)) return false; buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type; pack_uint32_(block->length, buffer + 1, 3); if(write_cb(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH) return false; return true; } FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block) { FLAC__ASSERT(0 != block); switch(block->type) { case FLAC__METADATA_TYPE_STREAMINFO: return write_metadata_block_data_streaminfo_cb_(handle, write_cb, &block->data.stream_info); case FLAC__METADATA_TYPE_PADDING: return write_metadata_block_data_padding_cb_(handle, write_cb, &block->data.padding, block->length); case FLAC__METADATA_TYPE_APPLICATION: return write_metadata_block_data_application_cb_(handle, write_cb, &block->data.application, block->length); case FLAC__METADATA_TYPE_SEEKTABLE: return write_metadata_block_data_seektable_cb_(handle, write_cb, &block->data.seek_table); case FLAC__METADATA_TYPE_VORBIS_COMMENT: return write_metadata_block_data_vorbis_comment_cb_(handle, write_cb, &block->data.vorbis_comment); case FLAC__METADATA_TYPE_CUESHEET: return write_metadata_block_data_cuesheet_cb_(handle, write_cb, &block->data.cue_sheet); case FLAC__METADATA_TYPE_PICTURE: return write_metadata_block_data_picture_cb_(handle, write_cb, &block->data.picture); default: return write_metadata_block_data_unknown_cb_(handle, write_cb, &block->data.unknown, block->length); } } FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block) { FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH]; const uint32_t channels1 = block->channels - 1; const uint32_t bps1 = block->bits_per_sample - 1; /* we are using hardcoded numbers for simplicity but we should * probably eventually write a bit-level packer and use the * _STREAMINFO_ constants. */ pack_uint32_(block->min_blocksize, buffer, 2); pack_uint32_(block->max_blocksize, buffer+2, 2); pack_uint32_(block->min_framesize, buffer+4, 3); pack_uint32_(block->max_framesize, buffer+7, 3); buffer[10] = (block->sample_rate >> 12) & 0xff; buffer[11] = (block->sample_rate >> 4) & 0xff; buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4); buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f)); pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4); memcpy(buffer+18, block->md5sum, 16); if(write_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH) return false; return true; } FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, uint32_t block_length) { uint32_t i, n = block_length; FLAC__byte buffer[1024]; (void)block; memset(buffer, 0, 1024); for(i = 0; i < n/1024; i++) if(write_cb(buffer, 1, 1024, handle) != 1024) return false; n %= 1024; if(write_cb(buffer, 1, n, handle) != n) return false; return true; } FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, uint32_t block_length) { const uint32_t id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8; if(write_cb(block->id, 1, id_bytes, handle) != id_bytes) return false; block_length -= id_bytes; if(write_cb(block->data, 1, block_length, handle) != block_length) return false; return true; } FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block) { uint32_t i; FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH]; for(i = 0; i < block->num_points; i++) { /* some MAGIC NUMBERs here */ pack_uint64_(block->points[i].sample_number, buffer, 8); pack_uint64_(block->points[i].stream_offset, buffer+8, 8); pack_uint32_(block->points[i].frame_samples, buffer+16, 2); if(write_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH) return false; } return true; } FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block) { uint32_t i; const uint32_t entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8; const uint32_t num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8; FLAC__byte buffer[4]; /* magic number is asserted below */ FLAC__ASSERT(flac_max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == sizeof(buffer)); pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len); if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len) return false; if(write_cb(block->vendor_string.entry, 1, block->vendor_string.length, handle) != block->vendor_string.length) return false; pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len); if(write_cb(buffer, 1, num_comments_len, handle) != num_comments_len) return false; for(i = 0; i < block->num_comments; i++) { pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len); if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len) return false; if(write_cb(block->comments[i].entry, 1, block->comments[i].length, handle) != block->comments[i].length) return false; } return true; } FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block) { uint32_t i, j, len; FLAC__byte buffer[1024]; /* asserted below that this is big enough */ FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64)); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN/8); FLAC__ASSERT(sizeof(buffer) >= (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN)/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8); FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8; if(write_cb(block->media_catalog_number, 1, len, handle) != len) return false; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8; pack_uint64_(block->lead_in, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0); len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8; memset(buffer, 0, len); if(block->is_cd) buffer[0] |= 0x80; if(write_cb(buffer, 1, len, handle) != len) return false; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8; pack_uint32_(block->num_tracks, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; for(i = 0; i < block->num_tracks; i++) { FLAC__StreamMetadata_CueSheet_Track *track = block->tracks + i; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8; pack_uint64_(track->offset, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8; pack_uint32_(track->number, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8; if(write_cb(track->isrc, 1, len, handle) != len) return false; FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) % 8 == 0); len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8; memset(buffer, 0, len); buffer[0] = (track->type << 7) | (track->pre_emphasis << 6); if(write_cb(buffer, 1, len, handle) != len) return false; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8; pack_uint32_(track->num_indices, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; for(j = 0; j < track->num_indices; j++) { FLAC__StreamMetadata_CueSheet_Index *indx = track->indices + j; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8; pack_uint64_(indx->offset, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8; pack_uint32_(indx->number, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0); len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8; memset(buffer, 0, len); if(write_cb(buffer, 1, len, handle) != len) return false; } } return true; } FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block) { uint32_t len; size_t slen; FLAC__byte buffer[4]; /* magic number is asserted below */ FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_TYPE_LEN%8); FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN%8); FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN%8); FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN%8); FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN%8); FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN%8); FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_COLORS_LEN%8); FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN%8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8); FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8); len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8; pack_uint32_(block->type, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; len = FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8; slen = strlen(block->mime_type); pack_uint32_(slen, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; if(write_cb(block->mime_type, 1, slen, handle) != slen) return false; len = FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8; slen = strlen((const char *)block->description); pack_uint32_(slen, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; if(write_cb(block->description, 1, slen, handle) != slen) return false; len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8; pack_uint32_(block->width, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8; pack_uint32_(block->height, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8; pack_uint32_(block->depth, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8; pack_uint32_(block->colors, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; len = FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8; pack_uint32_(block->data_length, buffer, len); if(write_cb(buffer, 1, len, handle) != len) return false; if(write_cb(block->data, 1, block->data_length, handle) != block->data_length) return false; return true; } FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, uint32_t block_length) { if(write_cb(block->data, 1, block_length, handle) != block_length) return false; return true; } FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block) { if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } if(!write_metadata_block_header_(iterator->file, &iterator->status, block)) return false; if(!write_metadata_block_data_(iterator->file, &iterator->status, block)) return false; if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } return read_metadata_block_header_(iterator); } FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, uint32_t padding_length, FLAC__bool padding_is_last) { FLAC__StreamMetadata *padding; if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } block->is_last = false; if(!write_metadata_block_header_(iterator->file, &iterator->status, block)) return false; if(!write_metadata_block_data_(iterator->file, &iterator->status, block)) return false; if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; padding->is_last = padding_is_last; padding->length = padding_length; if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) { FLAC__metadata_object_delete(padding); return false; } if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) { FLAC__metadata_object_delete(padding); return false; } FLAC__metadata_object_delete(padding); if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } return read_metadata_block_header_(iterator); } FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append) { FILE *tempfile = NULL; char *tempfilename = NULL; int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */ FLAC__off_t fixup_is_last_flag_offset = -1; FLAC__ASSERT(0 != block || append == false); if(iterator->is_last) { if(append) { fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */ fixup_is_last_flag_offset = iterator->offset[iterator->depth]; } else if(0 == block) { simple_iterator_push_(iterator); if(!FLAC__metadata_simple_iterator_prev(iterator)) { (void)simple_iterator_pop_(iterator); return false; } fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */ fixup_is_last_flag_offset = iterator->offset[iterator->depth]; if(!simple_iterator_pop_(iterator)) return false; } } if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append)) return false; if(0 != block) { if(!write_metadata_block_header_(tempfile, &iterator->status, block)) { cleanup_tempfile_(&tempfile, &tempfilename); return false; } if(!write_metadata_block_data_(tempfile, &iterator->status, block)) { cleanup_tempfile_(&tempfile, &tempfilename); return false; } } if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0)) return false; if(append) return FLAC__metadata_simple_iterator_next(iterator); return true; } void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH); iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth]; iterator->depth++; } FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator) { FLAC__ASSERT(iterator->depth > 0); iterator->depth--; if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } return read_metadata_block_header_(iterator); } /* return meanings: * 0: ok * 1: read error * 2: seek error * 3: not a FLAC file */ uint32_t seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb) { FLAC__byte buffer[4]; size_t n; uint32_t i; FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == sizeof(buffer)); /* skip any id3v2 tag */ errno = 0; n = read_cb(buffer, 1, 4, handle); if(errno) return 1; else if(n != 4) return 3; else if(0 == memcmp(buffer, "ID3", 3)) { uint32_t tag_length = 0; /* skip to the tag length */ if(seek_cb(handle, 2, SEEK_CUR) < 0) return 2; /* read the length */ for(i = 0; i < 4; i++) { if(read_cb(buffer, 1, 1, handle) < 1 || buffer[0] & 0x80) return 1; tag_length <<= 7; tag_length |= (buffer[0] & 0x7f); } /* skip the rest of the tag */ if(seek_cb(handle, tag_length, SEEK_CUR) < 0) return 2; /* read the stream sync code */ errno = 0; n = read_cb(buffer, 1, 4, handle); if(errno) return 1; else if(n != 4) return 3; } /* check for the fLaC signature */ if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH)) return 0; else return 3; } uint32_t seek_to_first_metadata_block_(FILE *f) { return seek_to_first_metadata_block_cb_((FLAC__IOHandle)f, (FLAC__IOCallback_Read)fread, fseek_wrapper_); } FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append) { const FLAC__off_t offset_end = append? iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length : iterator->offset[iterator->depth]; if(0 != fseeko(iterator->file, 0, SEEK_SET)) { iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) { cleanup_tempfile_(tempfile, tempfilename); return false; } if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) { cleanup_tempfile_(tempfile, tempfilename); return false; } return true; } FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, FLAC__off_t fixup_is_last_flag_offset, FLAC__bool backup) { FLAC__off_t save_offset = iterator->offset[iterator->depth]; FLAC__ASSERT(0 != *tempfile); if(0 != fseeko(iterator->file, save_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length, SEEK_SET)) { cleanup_tempfile_(tempfile, tempfilename); iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) { cleanup_tempfile_(tempfile, tempfilename); return false; } if(fixup_is_last_code != 0) { /* * if code == 1, it means a block was appended to the end so * we have to clear the is_last flag of the previous block * if code == -1, it means the last block was deleted so * we have to set the is_last flag of the previous block */ /* MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */ FLAC__byte x; if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) { cleanup_tempfile_(tempfile, tempfilename); iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } if(fread(&x, 1, 1, *tempfile) != 1) { cleanup_tempfile_(tempfile, tempfilename); iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; return false; } if(fixup_is_last_code > 0) { FLAC__ASSERT(x & 0x80); x &= 0x7f; } else { FLAC__ASSERT(!(x & 0x80)); x |= 0x80; } if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) { cleanup_tempfile_(tempfile, tempfilename); iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; return false; } if(local__fwrite(&x, 1, 1, *tempfile) != 1) { cleanup_tempfile_(tempfile, tempfilename); iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; return false; } } (void)fclose(iterator->file); if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status)) return false; if(iterator->has_stats) set_file_stats_(iterator->filename, &iterator->stats); if(!simple_iterator_prime_input_(iterator, !iterator->is_writable)) return false; if(backup) { while(iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length < save_offset) if(!FLAC__metadata_simple_iterator_next(iterator)) return false; return true; } else { /* move the iterator to it's original block faster by faking a push, then doing a pop_ */ FLAC__ASSERT(iterator->depth == 0); iterator->offset[0] = save_offset; iterator->depth++; return simple_iterator_pop_(iterator); } } FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status) { FLAC__byte buffer[8192]; size_t n; FLAC__ASSERT(bytes >= 0); while(bytes > 0) { n = flac_min(sizeof(buffer), (size_t)bytes); if(fread(buffer, 1, n, file) != n) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; return false; } if(local__fwrite(buffer, 1, n, tempfile) != n) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; return false; } bytes -= n; } return true; } FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status) { FLAC__byte buffer[8192]; size_t n; FLAC__ASSERT(bytes >= 0); while(bytes > 0) { n = flac_min(sizeof(buffer), (size_t)bytes); if(read_cb(buffer, 1, n, handle) != n) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; return false; } if(temp_write_cb(buffer, 1, n, temp_handle) != n) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; return false; } bytes -= n; } return true; } FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status) { FLAC__byte buffer[8192]; size_t n; while(!feof(file)) { n = fread(buffer, 1, sizeof(buffer), file); if(n == 0 && !feof(file)) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; return false; } if(n > 0 && local__fwrite(buffer, 1, n, tempfile) != n) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; return false; } } return true; } FLAC__bool copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__Metadata_SimpleIteratorStatus *status) { FLAC__byte buffer[8192]; size_t n; while(!eof_cb(handle)) { n = read_cb(buffer, 1, sizeof(buffer), handle); if(n == 0 && !eof_cb(handle)) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; return false; } if(n > 0 && temp_write_cb(buffer, 1, n, temp_handle) != n) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; return false; } } return true; } static int local_snprintf(char *str, size_t size, const char *fmt, ...) { va_list va; int rc; #if defined _MSC_VER if (size == 0) return 1024; #endif va_start (va, fmt); #if defined _MSC_VER rc = vsnprintf_s (str, size, _TRUNCATE, fmt, va); if (rc < 0) rc = size - 1; #elif defined __MINGW32__ rc = __mingw_vsnprintf (str, size, fmt, va); #else rc = vsnprintf (str, size, fmt, va); #endif va_end (va); return rc; } FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status) { static const char *tempfile_suffix = ".metadata_edit"; if(0 == tempfile_path_prefix) { size_t dest_len = strlen(filename) + strlen(tempfile_suffix) + 1; if(0 == (*tempfilename = safe_malloc_(dest_len))) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; return false; } local_snprintf(*tempfilename, dest_len, "%s%s", filename, tempfile_suffix); } else { const char *p = strrchr(filename, '/'); size_t dest_len; if(0 == p) p = filename; else p++; dest_len = strlen(tempfile_path_prefix) + strlen(p) + strlen(tempfile_suffix) + 2; if(0 == (*tempfilename = safe_malloc_(dest_len))) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; return false; } local_snprintf(*tempfilename, dest_len, "%s/%s%s", tempfile_path_prefix, p, tempfile_suffix); } if(0 == (*tempfile = flac_fopen(*tempfilename, "w+b"))) { *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE; return false; } return true; } FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status) { FLAC__ASSERT(0 != filename); FLAC__ASSERT(0 != tempfile); FLAC__ASSERT(0 != *tempfile); FLAC__ASSERT(0 != tempfilename); FLAC__ASSERT(0 != *tempfilename); FLAC__ASSERT(0 != status); (void)fclose(*tempfile); *tempfile = 0; #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__ || defined __EMX__ /* on some flavors of windows, flac_rename() will fail if the destination already exists */ if(flac_unlink(filename) < 0) { cleanup_tempfile_(tempfile, tempfilename); *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR; return false; } #endif /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just flac_rename(): */ if(0 != flac_rename(*tempfilename, filename)) { cleanup_tempfile_(tempfile, tempfilename); *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR; return false; } cleanup_tempfile_(tempfile, tempfilename); return true; } void cleanup_tempfile_(FILE **tempfile, char **tempfilename) { if(0 != *tempfile) { (void)fclose(*tempfile); *tempfile = 0; } if(0 != *tempfilename) { (void)flac_unlink(*tempfilename); free(*tempfilename); *tempfilename = 0; } } FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stats) { FLAC__ASSERT(0 != filename); FLAC__ASSERT(0 != stats); return (0 == flac_stat(filename, stats)); } void set_file_stats_(const char *filename, struct flac_stat_s *stats) { #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200809L) struct timespec srctime[2] = {}; srctime[0].tv_sec = stats->st_atime; srctime[1].tv_sec = stats->st_mtime; #else struct utimbuf srctime; srctime.actime = stats->st_atime; srctime.modtime = stats->st_mtime; #endif FLAC__ASSERT(0 != filename); FLAC__ASSERT(0 != stats); (void)flac_chmod(filename, stats->st_mode); (void)flac_utime(filename, &srctime); #if !defined _MSC_VER && !defined __BORLANDC__ && !defined __MINGW32__ FLAC_CHECK_RETURN(chown(filename, stats->st_uid, -1)); FLAC_CHECK_RETURN(chown(filename, -1, stats->st_gid)); #endif } int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence) { return fseeko((FILE*)handle, (FLAC__off_t)offset, whence); } FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle) { return ftello((FILE*)handle); } FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status) { switch(status) { case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK: return FLAC__METADATA_CHAIN_STATUS_OK; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT: return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE: return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE: return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE: return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA: return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR: return FLAC__METADATA_CHAIN_STATUS_READ_ERROR; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR: return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR: return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR: return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR: return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR: return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR: default: return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; } }

↑ V595 The 'iterator' pointer was utilized before it was verified against nullptr. Check lines: 629, 631.

↑ V595 The 'iterator' pointer was utilized before it was verified against nullptr. Check lines: 658, 661.

↑ V595 The 'iterator' pointer was utilized before it was verified against nullptr. Check lines: 759, 762.

↑ V595 The 'stats' pointer was utilized before it was verified against nullptr. Check lines: 3431, 3436.

↑ V560 A part of conditional expression is always false: cd.got_error.

↑ V560 A part of conditional expression is always false: 0 != tempfile_path_prefix.

↑ V1004 The 'chain->tail' pointer was used unsafely after it was verified against nullptr. Check lines: 986, 993.

↑ V522 There might be dereferencing of a potential null pointer 'block->points'.

↑ V522 There might be dereferencing of a potential null pointer 'track->indices'.

↑ V525 The code contains the collection of similar blocks. Check items '2', '3', '3' in lines 2653, 2654, 2655.

↑ V769 The 'block->comments' pointer in the 'block->comments + i' expression could be nullptr. In such case, resulting value will be senseless and it should not be used.

↑ V769 The 'block->tracks' pointer in the 'block->tracks + i' expression could be nullptr. In such case, resulting value will be senseless and it should not be used.

↑ V813 Decreased performance. The 'callbacks' argument should probably be rendered as a constant pointer.