blob: 0a84d03bcc4dd69016f9cd00ce2307c1fc904268 [file] [log] [blame]
/* 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, unsigned bytes);
static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned 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, unsigned *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, unsigned block_length);
static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length);
static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned 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, unsigned 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, unsigned 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, unsigned 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, unsigned block_length);
static FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned 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, unsigned 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, unsigned 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 unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb);
static unsigned 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, unsigned max_width, unsigned max_height, unsigned max_depth, unsigned 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 */
unsigned depth;
/* this is the metadata block header of the current block we are pointing to: */
FLAC__bool is_last;
FLAC__MetadataType type;
unsigned 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)
{
unsigned 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 unsigned 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 unsigned 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 */ {
unsigned 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 unsigned 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)
{
unsigned 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;
unsigned 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 unsigned 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;
unsigned 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;
unsigned 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) {
unsigned 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 */
unsigned 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;
unsigned 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, unsigned bytes)
{
unsigned 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, unsigned bytes)
{
unsigned i;
for(i = 0; i < bytes; i++) {
*(b++) = (FLAC__byte)(val & 0xff);
val >>= 8;
}
}
void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
{
unsigned i;
b += bytes;
for(i = 0; i < bytes; i++) {
*(--b) = (FLAC__byte)(val & 0xff);
val >>= 8;
}
}
FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
{
FLAC__uint32 ret = 0;
unsigned i;
for(i = 0; i < bytes; i++)
ret = (ret << 8) | (FLAC__uint32)(*b++);
return ret;
}
FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
{
FLAC__uint32 ret = 0;
unsigned i;
b += bytes;
for(i = 0; i < bytes; i++)
ret = (ret << 8) | (FLAC__uint32)(*--b);
return ret;
}
FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
{
FLAC__uint64 ret = 0;
unsigned 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, unsigned *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) | ((unsigned)(b[2] & 0xf0) >> 4);
block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 4) | (((unsigned)(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, unsigned 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, unsigned block_length)
{
const unsigned 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, unsigned block_length)
{
unsigned 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, unsigned max_length)
{
const unsigned 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, unsigned block_length)
{
unsigned i;
FLAC__Metadata_SimpleIteratorStatus status;
const unsigned 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)
{
unsigned 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)
{
unsigned 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, unsigned 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