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metadata_iterators.c
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metadata_iterators.c
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/* libFLAC - Free Lossless Audio Codec library
* Copyright (C) 2001-2009 Josh Coalson
* Copyright (C) 2011-2023 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 "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);
if(0 != obj) {
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);
}
}
else
break;
}
} 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);
ret = read_metadata_block_header_(iterator);
/* The first metadata block must be a streaminfo. If this is not the
* case, the file is invalid and assumptions made elsewhere in the
* code are invalid */
if(iterator->type != FLAC__METADATA_TYPE_STREAMINFO) {
iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA;
return false;
}
return ret;
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);
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
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);
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
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);
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
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);
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
return (off_t)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);
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
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);
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
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);
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
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);
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
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);
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
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 {
if((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 {
if((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);
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
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 {
if((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;
FLAC__ASSERT(iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
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 {
if((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)