📄 load_669.c
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/* MikMod sound library
(c) 1998, 1999, 2000, 2001, 2002 Miodrag Vallat and others - see file
AUTHORS for complete list.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library 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 Library General Public License for more details.
You should have received a copy of the GNU Library 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.
*/
/*==============================================================================
$Id: load_669.c,v 1.1.1.1 2004/01/21 01:36:35 raph Exp $
Composer 669 module loader
==============================================================================*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <string.h>
#include "mikmod_internals.h"
#ifdef SUNOS
extern int fprintf(FILE *, const char *, ...);
#endif
/*========== Module structure */
/* header */
typedef struct S69HEADER {
UBYTE marker[2];
CHAR message[108];
UBYTE nos;
UBYTE nop;
UBYTE looporder;
UBYTE orders[0x80];
UBYTE tempos[0x80];
UBYTE breaks[0x80];
} S69HEADER;
/* sample information */
typedef struct S69SAMPLE {
CHAR filename[13];
SLONG length;
SLONG loopbeg;
SLONG loopend;
} S69SAMPLE;
/* encoded note */
typedef struct S69NOTE {
UBYTE a,b,c;
} S69NOTE;
/*========== Loader variables */
/* current pattern */
static S69NOTE* s69pat=NULL;
/* Module header */
static S69HEADER* mh=NULL;
/* file type identification */
static CHAR* S69_Version[]={
"Composer 669",
"Extended 669"
};
/*========== Loader code */
BOOL S69_Test(void)
{
UBYTE buf[0x80];
if(!_mm_read_UBYTES(buf,2,modreader))
return 0;
/* look for id */
if(!memcmp(buf,"if",2) || !memcmp(buf,"JN",2)) {
int i;
/* skip song message */
_mm_fseek(modreader,108,SEEK_CUR);
/* sanity checks */
if(_mm_read_UBYTE(modreader) > 64) return 0;
if(_mm_read_UBYTE(modreader) > 128) return 0;
if(_mm_read_UBYTE(modreader) > 127) return 0;
/* check order table */
if(!_mm_read_UBYTES(buf,0x80,modreader)) return 0;
for(i=0;i<0x80;i++)
if((buf[i]>=0x80)&&(buf[i]!=0xff)) return 0;
/* check tempos table */
if(!_mm_read_UBYTES(buf,0x80,modreader)) return 0;
for(i=0;i<0x80;i++)
if((!buf[i])||(buf[i]>32)) return 0;
/* check pattern length table */
if(!_mm_read_UBYTES(buf,0x80,modreader)) return 0;
for(i=0;i<0x80;i++)
if(buf[i]>0x3f) return 0;
} else
return 0;
return 1;
}
BOOL S69_Init(void)
{
if(!(s69pat=(S69NOTE *)_mm_malloc(64*8*sizeof(S69NOTE)))) return 0;
if(!(mh=(S69HEADER *)_mm_malloc(sizeof(S69HEADER)))) return 0;
return 1;
}
void S69_Cleanup(void)
{
_mm_free(s69pat);
_mm_free(mh);
}
static BOOL S69_LoadPatterns(void)
{
int track,row,channel;
UBYTE note,inst,vol,effect,lastfx,lastval;
S69NOTE *cur;
int tracks=0;
if(!AllocPatterns()) return 0;
if(!AllocTracks()) return 0;
for(track=0;track<of.numpat;track++) {
/* set pattern break locations */
of.pattrows[track]=mh->breaks[track]+1;
/* load the 669 pattern */
cur=s69pat;
for(row=0;row<64;row++) {
for(channel=0;channel<8;channel++,cur++) {
cur->a = _mm_read_UBYTE(modreader);
cur->b = _mm_read_UBYTE(modreader);
cur->c = _mm_read_UBYTE(modreader);
}
}
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_PATTERN;
return 0;
}
/* translate the pattern */
for(channel=0;channel<8;channel++) {
UniReset();
/* set pattern tempo */
UniPTEffect(0xf,78);
UniPTEffect(0xf,mh->tempos[track]);
lastfx=0xff,lastval=0;
for(row=0;row<=mh->breaks[track];row++) {
int a,b,c;
/* fetch the encoded note */
a=s69pat[(row*8)+channel].a;
b=s69pat[(row*8)+channel].b;
c=s69pat[(row*8)+channel].c;
/* decode it */
note=a>>2;
inst=((a&0x3)<<4)|((b&0xf0)>>4);
vol=b&0xf;
if (a<0xff) {
if (a<0xfe) {
UniInstrument(inst);
UniNote(note+2*OCTAVE);
lastfx=0xff; /* reset background effect memory */
}
UniPTEffect(0xc,vol<<2);
}
if ((c!=0xff)||(lastfx!=0xff)) {
if(c==0xff)
c=lastfx,effect=lastval;
else
effect=c&0xf;
switch(c>>4) {
case 0: /* porta up */
UniPTEffect(0x1,effect);
lastfx=c,lastval=effect;
break;
case 1: /* porta down */
UniPTEffect(0x2,effect);
lastfx=c,lastval=effect;
break;
case 2: /* porta to note */
UniPTEffect(0x3,effect);
lastfx=c,lastval=effect;
break;
case 3: /* frequency adjust */
/* DMP converts this effect to S3M FF1. Why not ? */
UniEffect(UNI_S3MEFFECTF,0xf0|effect);
break;
case 4: /* vibrato */
UniPTEffect(0x4,effect);
lastfx=c,lastval=effect;
break;
case 5: /* set speed */
if (effect)
UniPTEffect(0xf,effect);
else
if(mh->marker[0]!=0x69) {
#ifdef MIKMOD_DEBUG
fprintf(stderr,"\r669: unsupported super fast tempo at pat=%d row=%d chan=%d\n",
track,row,channel);
#endif
}
break;
}
}
UniNewline();
}
if(!(of.tracks[tracks++]=UniDup())) return 0;
}
}
return 1;
}
BOOL S69_Load(BOOL curious)
{
int i;
SAMPLE *current;
S69SAMPLE sample;
/* module header */
_mm_read_UBYTES(mh->marker,2,modreader);
_mm_read_UBYTES(mh->message,108,modreader);
mh->nos=_mm_read_UBYTE(modreader);
mh->nop=_mm_read_UBYTE(modreader);
mh->looporder=_mm_read_UBYTE(modreader);
_mm_read_UBYTES(mh->orders,0x80,modreader);
for(i=0;i<0x80;i++)
if ((mh->orders[i]>=0x80)&&(mh->orders[i]!=0xff)) {
_mm_errno=MMERR_NOT_A_MODULE;
return 1;
}
_mm_read_UBYTES(mh->tempos,0x80,modreader);
for(i=0;i<0x80;i++)
if ((!mh->tempos[i])||(mh->tempos[i]>32)) {
_mm_errno=MMERR_NOT_A_MODULE;
return 1;
}
_mm_read_UBYTES(mh->breaks,0x80,modreader);
for(i=0;i<0x80;i++)
if (mh->breaks[i]>0x3f) {
_mm_errno=MMERR_NOT_A_MODULE;
return 1;
}
/* set module variables */
of.initspeed=4;
of.inittempo=78;
of.songname=DupStr(mh->message,36,1);
of.modtype=strdup(S69_Version[memcmp(mh->marker,"JN",2)==0]);
of.numchn=8;
of.numpat=mh->nop;
of.numins=of.numsmp=mh->nos;
of.numtrk=of.numchn*of.numpat;
of.flags=UF_XMPERIODS|UF_LINEAR;
for(i= 35;(i>= 0)&&(mh->message[i]==' ');i--) mh->message[i]=0;
for(i=36+35;(i>=36+0)&&(mh->message[i]==' ');i--) mh->message[i]=0;
for(i=72+35;(i>=72+0)&&(mh->message[i]==' ');i--) mh->message[i]=0;
if((mh->message[0])||(mh->message[36])||(mh->message[72]))
if((of.comment=(CHAR*)_mm_malloc(3*(36+1)+1))) {
strncpy(of.comment,mh->message,36);
strcat(of.comment,"\r");
if (mh->message[36]) strncat(of.comment,mh->message+36,36);
strcat(of.comment,"\r");
if (mh->message[72]) strncat(of.comment,mh->message+72,36);
strcat(of.comment,"\r");
of.comment[3*(36+1)]=0;
}
if(!AllocPositions(0x80)) return 0;
for(i=0;i<0x80;i++) {
if(mh->orders[i]>=mh->nop) break;
of.positions[i]=mh->orders[i];
}
of.numpos=i;
of.reppos=mh->looporder<of.numpos?mh->looporder:0;
if(!AllocSamples()) return 0;
current=of.samples;
for(i=0;i<of.numins;i++) {
/* sample information */
_mm_read_UBYTES((UBYTE*)sample.filename,13,modreader);
sample.length=_mm_read_I_SLONG(modreader);
sample.loopbeg=_mm_read_I_SLONG(modreader);
sample.loopend=_mm_read_I_SLONG(modreader);
if (sample.loopend==0xfffff) sample.loopend=0;
if((sample.length<0)||(sample.loopbeg<-1)||(sample.loopend<-1)) {
_mm_errno = MMERR_LOADING_HEADER;
return 0;
}
current->samplename=DupStr(sample.filename,13,1);
current->seekpos=0;
current->speed=0;
current->length=sample.length;
current->loopstart=sample.loopbeg;
current->loopend=sample.loopend;
current->flags=(sample.loopbeg<sample.loopend)?SF_LOOP:0;
current->volume=64;
current++;
}
if(!S69_LoadPatterns()) return 0;
return 1;
}
CHAR *S69_LoadTitle(void)
{
CHAR s[36];
_mm_fseek(modreader,2,SEEK_SET);
if(!_mm_read_UBYTES(s,36,modreader)) return NULL;
return(DupStr(s,36,1));
}
/*========== Loader information */
MIKMODAPI MLOADER load_669={
NULL,
"669",
"669 (Composer 669, Unis 669)",
S69_Init,
S69_Test,
S69_Load,
S69_Cleanup,
S69_LoadTitle
};
/* ex:set ts=4: */
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