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/*
* This file is part of libextractor.
* (C) 2006, 2007 Toni Ruottu
*
* libextractor 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, or (at your
* option) any later version.
*
* libextractor 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 libextractor; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include "platform.h"
#include "extractor.h"
#define SID1_HEADER_SIZE 0x76
#define SID2_HEADER_SIZE 0x7c
/* flags */
#define MUSPLAYER_FLAG 0x01
#define PLAYSID_FLAG 0x02
#define PAL_FLAG 0x04
#define NTSC_FLAG 0x08
#define MOS6581_FLAG 0x10
#define MOS8580_FLAG 0x20
typedef char sidwrd[2];
typedef char sidlongwrd[4];
struct header
{
char magicid[4];
sidwrd sidversion;
sidwrd dataoffset;
sidwrd loadaddr;
sidwrd initaddr;
sidwrd playaddr;
sidwrd songs;
sidwrd firstsong;
sidlongwrd speed;
char title[32];
char artist[32];
char copyright[32];
sidwrd flags; /* version 2 specific fields start */
char startpage;
char pagelength;
sidwrd reserved;
};
static int
sidword (const sidwrd data)
{
int value = (unsigned char) data[0] * 0x100 + (unsigned char) data[1];
return value;
}
#define ADD(s,t) do { if (0 != proc (proc_cls, "sid", t, EXTRACTOR_METAFORMAT_UTF8, "text/plain", s, strlen(s)+1)) return 1; } while (0)
/* "extract" keyword from a SID file
*
* This plugin is based on the nsf extractor
*
*/
int
EXTRACTOR_sid_extract (const char *data,
size_t size,
EXTRACTOR_MetaDataProcessor proc,
void *proc_cls,
const char *options)
{
unsigned int flags;
int version;
char album[33];
char artist[33];
char copyright[33];
char songs[32];
char startingsong[32];
char sidversion[32];
const struct header *head;
/* Check header size */
if (size < SID1_HEADER_SIZE)
return 0;
head = (const struct header *) data;
/* Check "magic" id bytes */
if (memcmp (head->magicid, "PSID", 4) &&
memcmp (head->magicid, "RSID", 4))
return 0;
/* Mime-type */
ADD ("audio/prs.sid", EXTRACTOR_METATYPE_MIMETYPE);
/* Version of SID format */
version = sidword (head->sidversion);
snprintf (sidversion,
sizeof(sidversion),
"%d",
version);
ADD (sidversion, EXTRACTOR_METATYPE_FORMAT_VERSION);
/* Get song count */
snprintf (songs,
sizeof(songs),
"%d", sidword (head->songs));
ADD (songs, EXTRACTOR_METATYPE_SONG_COUNT);
/* Get number of the first song to be played */
snprintf (startingsong,
sizeof(startingsong),
"%d",
sidword (head->firstsong));
ADD (startingsong, EXTRACTOR_METATYPE_STARTING_SONG);
/* name, artist, copyright fields */
memcpy (&album, head->title, 32);
album[32] = '\0';
ADD (album, EXTRACTOR_METATYPE_ALBUM);
memcpy (&artist, head->artist, 32);
artist[32] = '\0';
ADD (artist, EXTRACTOR_METATYPE_ARTIST);
memcpy (©right, head->copyright, 32);
copyright[32] = '\0';
ADD (copyright, EXTRACTOR_METATYPE_COPYRIGHT);
if ( (version < 2) || (size < SID2_HEADER_SIZE))
return 0;
/* Version 2 specific options follow
*
* Note: Had some troubles understanding specification
* on the flags in version 2. I hope this is correct.
*/
flags = sidword (head->flags);
/* MUS data */
if (flags & MUSPLAYER_FLAG)
ADD ("Compute!'s Sidplayer", EXTRACTOR_METATYPE_CREATED_BY_SOFTWARE);
/* PlaySID data */
if (flags & PLAYSID_FLAG)
ADD ("PlaySID", EXTRACTOR_METATYPE_CREATED_BY_SOFTWARE);
/* PAL or NTSC */
if (flags & PAL_FLAG)
{
if (flags & NTSC_FLAG)
ADD ("PAL/NTSC", EXTRACTOR_METATYPE_BROADCAST_TELEVISION_SYSTEM);
else
ADD ("PAL", EXTRACTOR_METATYPE_BROADCAST_TELEVISION_SYSTEM);
}
else
{
if (flags & NTSC_FLAG)
ADD ("NTSC", EXTRACTOR_METATYPE_BROADCAST_TELEVISION_SYSTEM);
}
/* Detect SID Chips suitable for play the files */
if (flags & MOS6581_FLAG)
{
if (flags & MOS8580_FLAG)
ADD ("MOS6581/MOS8580", EXTRACTOR_METATYPE_TARGET_ARCHITECTURE);
else
ADD ("MOS6581", EXTRACTOR_METATYPE_TARGET_ARCHITECTURE);
}
else
{
if (flags & MOS8580_FLAG)
ADD ("MOS8580", EXTRACTOR_METATYPE_TARGET_ARCHITECTURE);
}
return 0;
}
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