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/*
* Adplug - Replayer for many OPL2/OPL3 audio file formats.
* Copyright (C) 1999 - 2006 Simon Peter, <dn.tlp@gmx.net>, et al.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* mtk.cpp - MPU-401 Trakker Loader by Simon Peter (dn.tlp@gmx.net)
*/
#include <cstring>
#include "mtk.h"
/*** public methods **************************************/
CPlayer *CmtkLoader::factory(Copl *newopl)
{
return new CmtkLoader(newopl);
}
bool CmtkLoader::load(const std::string &filename, const CFileProvider &fp)
{
binistream *f = fp.open(filename); if(!f) return false;
struct {
char id[18];
unsigned short crc,size;
} header;
struct mtkdata {
char songname[34],composername[34],instname[0x80][34];
unsigned char insts[0x80][12],order[0x80],dummy,patterns[0x32][0x40][9];
} *data;
unsigned char *cmp,*org;
unsigned int i;
unsigned long cmpsize,cmpptr=0,orgptr=0;
unsigned short ctrlbits=0,ctrlmask=0,cmd,cnt,offs;
// read header
f->readString(header.id, 18);
header.crc = f->readInt(2);
header.size = f->readInt(2);
// file validation section
if(strncmp(header.id,"mpu401tr\x92kk\xeer@data",18))
{ fp.close(f); return false; }
// load section
cmpsize = fp.filesize(f) - 22;
cmp = new unsigned char[cmpsize];
org = new unsigned char[header.size];
for(i = 0; i < cmpsize; i++) cmp[i] = f->readInt(1);
fp.close(f);
while(cmpptr < cmpsize) { // decompress
ctrlmask >>= 1;
if(!ctrlmask) {
ctrlbits = cmp[cmpptr] + (cmp[cmpptr + 1] << 8);
cmpptr += 2;
ctrlmask = 0x8000;
}
if(!(ctrlbits & ctrlmask)) { // uncompressed data
if(orgptr >= header.size)
goto err;
org[orgptr] = cmp[cmpptr];
orgptr++; cmpptr++;
continue;
}
// compressed data
cmd = (cmp[cmpptr] >> 4) & 0x0f;
cnt = cmp[cmpptr] & 0x0f;
cmpptr++;
switch(cmd) {
case 0:
if(orgptr + cnt > header.size) goto err;
cnt += 3;
memset(&org[orgptr],cmp[cmpptr],cnt);
cmpptr++; orgptr += cnt;
break;
case 1:
if(orgptr + cnt > header.size) goto err;
cnt += (cmp[cmpptr] << 4) + 19;
memset(&org[orgptr],cmp[++cmpptr],cnt);
cmpptr++; orgptr += cnt;
break;
case 2:
if(orgptr + cnt > header.size) goto err;
offs = (cnt+3) + (cmp[cmpptr] << 4);
cnt = cmp[++cmpptr] + 16; cmpptr++;
memcpy(&org[orgptr],&org[orgptr - offs],cnt);
orgptr += cnt;
break;
default:
if(orgptr + cmd > header.size) goto err;
offs = (cnt+3) + (cmp[cmpptr++] << 4);
memcpy(&org[orgptr],&org[orgptr-offs],cmd);
orgptr += cmd;
break;
}
}
delete [] cmp;
data = (struct mtkdata *) org;
// convert to HSC replay data
memset(title,0,34); strncpy(title,data->songname+1,33);
memset(composer,0,34); strncpy(composer,data->composername+1,33);
memset(instname,0,0x80*34);
for(i=0;i<0x80;i++)
strncpy(instname[i],data->instname[i]+1,33);
memcpy(instr,data->insts,0x80 * 12);
memcpy(song,data->order,0x80);
memcpy(patterns,data->patterns,header.size-6084);
for (i=0;i<128;i++) { // correct instruments
instr[i][2] ^= (instr[i][2] & 0x40) << 1;
instr[i][3] ^= (instr[i][3] & 0x40) << 1;
instr[i][11] >>= 4; // make unsigned
}
delete [] org;
rewind(0);
return true;
err:
delete [] cmp;
delete [] org;
return false;
}
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