171 lines
3.8 KiB
C
171 lines
3.8 KiB
C
/*
|
|
* Copyright (C) 2012 The Music Player Daemon Project
|
|
* http://www.musicpd.org
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
/* \file
|
|
*
|
|
* This file contains functions used by the DSF and DSDIFF decoders.
|
|
*
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "dsf_decoder_plugin.h"
|
|
#include "decoder_api.h"
|
|
#include "util/bit_reverse.h"
|
|
#include "tag_handler.h"
|
|
#include "tag_id3.h"
|
|
#include "dsdlib.h"
|
|
#include "dsdiff_decoder_plugin.h"
|
|
|
|
#include <unistd.h>
|
|
#include <stdio.h> /* for SEEK_SET, SEEK_CUR */
|
|
|
|
#ifdef HAVE_ID3TAG
|
|
#include <id3tag.h>
|
|
#endif
|
|
|
|
bool
|
|
dsdlib_id_equals(const struct dsdlib_id *id, const char *s)
|
|
{
|
|
assert(id != NULL);
|
|
assert(s != NULL);
|
|
assert(strlen(s) == sizeof(id->value));
|
|
|
|
return memcmp(id->value, s, sizeof(id->value)) == 0;
|
|
}
|
|
|
|
bool
|
|
dsdlib_read(struct decoder *decoder, struct input_stream *is,
|
|
void *data, size_t length)
|
|
{
|
|
size_t nbytes = decoder_read(decoder, is, data, length);
|
|
return nbytes == length;
|
|
}
|
|
|
|
/**
|
|
* Skip the #input_stream to the specified offset.
|
|
*/
|
|
bool
|
|
dsdlib_skip_to(struct decoder *decoder, struct input_stream *is,
|
|
goffset offset)
|
|
{
|
|
if (input_stream_is_seekable(is))
|
|
return input_stream_seek(is, offset, SEEK_SET, NULL);
|
|
|
|
if (input_stream_get_offset(is) > offset)
|
|
return false;
|
|
|
|
char buffer[8192];
|
|
while (input_stream_get_offset(is) < offset) {
|
|
size_t length = sizeof(buffer);
|
|
if (offset - input_stream_get_offset(is) < (goffset)length)
|
|
length = offset - input_stream_get_offset(is);
|
|
|
|
size_t nbytes = decoder_read(decoder, is, buffer, length);
|
|
if (nbytes == 0)
|
|
return false;
|
|
}
|
|
|
|
assert(input_stream_get_offset(is) == offset);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Skip some bytes from the #input_stream.
|
|
*/
|
|
bool
|
|
dsdlib_skip(struct decoder *decoder, struct input_stream *is,
|
|
goffset delta)
|
|
{
|
|
assert(delta >= 0);
|
|
|
|
if (delta == 0)
|
|
return true;
|
|
|
|
if (input_stream_is_seekable(is))
|
|
return input_stream_seek(is, delta, SEEK_CUR, NULL);
|
|
|
|
char buffer[8192];
|
|
while (delta > 0) {
|
|
size_t length = sizeof(buffer);
|
|
if ((goffset)length > delta)
|
|
length = delta;
|
|
|
|
size_t nbytes = decoder_read(decoder, is, buffer, length);
|
|
if (nbytes == 0)
|
|
return false;
|
|
|
|
delta -= nbytes;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Add tags from ID3 tag. All tags commonly found in the ID3 tags of
|
|
* DSF and DSDIFF files are imported
|
|
*/
|
|
|
|
#ifdef HAVE_ID3TAG
|
|
void
|
|
dsdlib_tag_id3(struct input_stream *is,
|
|
const struct tag_handler *handler,
|
|
void *handler_ctx, goffset tagoffset)
|
|
{
|
|
assert(tagoffset >= 0);
|
|
|
|
if (tagoffset == 0)
|
|
return;
|
|
|
|
if (!dsdlib_skip_to(NULL, is, tagoffset))
|
|
return;
|
|
|
|
struct id3_tag *id3_tag = NULL;
|
|
id3_length_t count;
|
|
|
|
/* Prevent broken files causing problems */
|
|
const goffset size = input_stream_get_size(is);
|
|
const goffset offset = input_stream_get_offset(is);
|
|
if (offset >= size)
|
|
return;
|
|
|
|
count = size - offset;
|
|
|
|
/* Check and limit id3 tag size to prevent a stack overflow */
|
|
if (count == 0 || count > 4096)
|
|
return;
|
|
|
|
id3_byte_t dsdid3[count];
|
|
id3_byte_t *dsdid3data;
|
|
dsdid3data = dsdid3;
|
|
|
|
if (!dsdlib_read(NULL, is, dsdid3data, count))
|
|
return;
|
|
|
|
id3_tag = id3_tag_parse(dsdid3data, count);
|
|
if (id3_tag == NULL)
|
|
return;
|
|
|
|
scan_id3_tag(id3_tag, handler, handler_ctx);
|
|
|
|
id3_tag_delete(id3_tag);
|
|
|
|
return;
|
|
}
|
|
#endif
|