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/*
* ALAC (Apple Lossless Audio Codec) decoder
* Copyright (c) 2005 David Hammerton
* All rights reserved.
*
* Basic stream reading
*
* http://crazney.net/programs/itunes/alac.html
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#ifdef _WIN32
#include "stdint_win.h"
#else
#include <stdint.h>
#endif
#include "stream.h"
extern DB_functions_t *deadbeef;
#define _Swap32(v) do { \
v = (((v) & 0x000000FF) << 0x18) | \
(((v) & 0x0000FF00) << 0x08) | \
(((v) & 0x00FF0000) >> 0x08) | \
(((v) & 0xFF000000) >> 0x18); } while(0)
#define _Swap16(v) do { \
v = (((v) & 0x00FF) << 0x08) | \
(((v) & 0xFF00) >> 0x08); } while (0)
extern int host_bigendian;
struct stream_tTAG {
DB_FILE *f;
int bigendian;
int eof;
int64_t junk_offset;
};
void stream_read(stream_t *stream, size_t size, void *buf)
{
size_t ret;
ret = deadbeef->fread(buf, 4, size >> 2, stream->f) * 4;
ret += deadbeef->fread((char*)buf + ret, 1, size - ret, stream->f);
if (ret == 0 && size != 0) stream->eof = 1;
}
int32_t stream_read_int32(stream_t *stream)
{
int32_t v;
stream_read(stream, 4, &v);
if ((stream->bigendian && !host_bigendian) ||
(!stream->bigendian && host_bigendian))
{
_Swap32(v);
}
return v;
}
uint32_t stream_read_uint32(stream_t *stream)
{
uint32_t v;
stream_read(stream, 4, &v);
if ((stream->bigendian && !host_bigendian) ||
(!stream->bigendian && host_bigendian))
{
_Swap32(v);
}
return v;
}
int16_t stream_read_int16(stream_t *stream)
{
int16_t v;
stream_read(stream, 2, &v);
if ((stream->bigendian && !host_bigendian) ||
(!stream->bigendian && host_bigendian))
{
_Swap16(v);
}
return v;
}
uint16_t stream_read_uint16(stream_t *stream)
{
uint16_t v;
stream_read(stream, 2, &v);
if ((stream->bigendian && !host_bigendian) ||
(!stream->bigendian && host_bigendian))
{
_Swap16(v);
}
return v;
}
int8_t stream_read_int8(stream_t *stream)
{
int8_t v;
stream_read(stream, 1, &v);
return v;
}
uint8_t stream_read_uint8(stream_t *stream)
{
uint8_t v;
stream_read(stream, 1, &v);
return v;
}
void stream_skip(stream_t *stream, int64_t skip)
{
if (deadbeef->fseek(stream->f, skip, SEEK_CUR) == 0) return;
if (errno == ESPIPE)
{
char *buffer = malloc(skip);
stream_read(stream, skip, buffer);
free(buffer);
}
}
int stream_eof(stream_t *stream)
{
return stream->eof;
}
int64_t stream_tell(stream_t *stream)
{
int64_t res = deadbeef->ftell(stream->f); /* returns -1 on error */
if (res < 0) {
return res;
}
return res - stream->junk_offset;
}
int64_t stream_setpos(stream_t *stream, int64_t pos)
{
return deadbeef->fseek(stream->f, pos + stream->junk_offset, SEEK_SET);
}
stream_t *stream_create_file(DB_FILE *file, int bigendian, int64_t junk_offset)
{
stream_t *new_stream;
new_stream = (stream_t*)malloc(sizeof(stream_t));
memset (new_stream, 0, sizeof (new_stream));
new_stream->f = file;
new_stream->bigendian = bigendian;
new_stream->eof = 0;
new_stream->junk_offset = 0;//junk_offset;
return new_stream;
}
void stream_destroy(stream_t *stream)
{
free(stream);
}
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