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/*
* 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
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