📄 mloader.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: mloader.c,v 1.1.1.1 2004/01/21 01:36:35 raph Exp $
These routines are used to access the available module loaders
==============================================================================*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <string.h>
#include "mikmod_internals.h"
#ifdef SUNOS
extern int fprintf(FILE *, const char *, ...);
#endif
MREADER *modreader;
MODULE of;
static MLOADER *firstloader=NULL;
UWORD finetune[16]={
8363,8413,8463,8529,8581,8651,8723,8757,
7895,7941,7985,8046,8107,8169,8232,8280
};
MIKMODAPI CHAR* MikMod_InfoLoader(void)
{
int len=0;
MLOADER *l;
CHAR *list=NULL;
MUTEX_LOCK(lists);
/* compute size of buffer */
for(l=firstloader;l;l=l->next) len+=1+(l->next?1:0)+strlen(l->version);
if(len)
if((list=_mm_malloc(len*sizeof(CHAR)))) {
list[0]=0;
/* list all registered module loders */
for(l=firstloader;l;l=l->next)
sprintf(list,(l->next)?"%s%s\n":"%s%s",list,l->version);
}
MUTEX_UNLOCK(lists);
return list;
}
void _mm_registerloader(MLOADER* ldr)
{
MLOADER *cruise=firstloader;
if(cruise) {
while(cruise->next) cruise = cruise->next;
cruise->next=ldr;
} else
firstloader=ldr;
}
MIKMODAPI void MikMod_RegisterLoader(struct MLOADER* ldr)
{
/* if we try to register an invalid loader, or an already registered loader,
ignore this attempt */
if ((!ldr)||(ldr->next))
return;
MUTEX_LOCK(lists);
_mm_registerloader(ldr);
MUTEX_UNLOCK(lists);
}
BOOL ReadComment(UWORD len)
{
if(len) {
int i;
if(!(of.comment=(CHAR*)_mm_malloc(len+1))) return 0;
_mm_read_UBYTES(of.comment,len,modreader);
/* translate IT linefeeds */
for(i=0;i<len;i++)
if(of.comment[i]=='\r') of.comment[i]='\n';
of.comment[len]=0; /* just in case */
}
if(!of.comment[0]) {
free(of.comment);
of.comment=NULL;
}
return 1;
}
BOOL ReadLinedComment(UWORD len,UWORD linelen)
{
CHAR *tempcomment,*line,*storage;
UWORD total=0,t,lines;
int i;
lines = (len + linelen - 1) / linelen;
if (len) {
if(!(tempcomment=(CHAR*)_mm_malloc(len+1))) return 0;
if(!(storage=(CHAR*)_mm_malloc(linelen+1))) {
free(tempcomment);
return 0;
}
memset(tempcomment, ' ', len);
_mm_read_UBYTES(tempcomment,len,modreader);
/* compute message length */
for(line=tempcomment,total=t=0;t<lines;t++,line+=linelen) {
for(i=linelen;(i>=0)&&(line[i]==' ');i--) line[i]=0;
for(i=0;i<linelen;i++) if (!line[i]) break;
total+=1+i;
}
if(total>lines) {
if(!(of.comment=(CHAR*)_mm_malloc(total+1))) {
free(storage);
free(tempcomment);
return 0;
}
/* convert message */
for(line=tempcomment,t=0;t<lines;t++,line+=linelen) {
for(i=0;i<linelen;i++) if(!(storage[i]=line[i])) break;
storage[i]=0; /* if (i==linelen) */
strcat(of.comment,storage);strcat(of.comment,"\r");
}
free(storage);
free(tempcomment);
}
}
return 1;
}
BOOL AllocPositions(int total)
{
if(!total) {
_mm_errno=MMERR_NOT_A_MODULE;
return 0;
}
if(!(of.positions=_mm_calloc(total,sizeof(UWORD)))) return 0;
return 1;
}
BOOL AllocPatterns(void)
{
int s,t,tracks = 0;
if((!of.numpat)||(!of.numchn)) {
_mm_errno=MMERR_NOT_A_MODULE;
return 0;
}
/* Allocate track sequencing array */
if(!(of.patterns=(UWORD*)_mm_calloc((ULONG)(of.numpat+1)*of.numchn,sizeof(UWORD)))) return 0;
if(!(of.pattrows=(UWORD*)_mm_calloc(of.numpat+1,sizeof(UWORD)))) return 0;
for(t=0;t<=of.numpat;t++) {
of.pattrows[t]=64;
for(s=0;s<of.numchn;s++)
of.patterns[(t*of.numchn)+s]=tracks++;
}
return 1;
}
BOOL AllocTracks(void)
{
if(!of.numtrk) {
_mm_errno=MMERR_NOT_A_MODULE;
return 0;
}
if(!(of.tracks=(UBYTE **)_mm_calloc(of.numtrk,sizeof(UBYTE *)))) return 0;
return 1;
}
BOOL AllocInstruments(void)
{
int t,n;
if(!of.numins) {
_mm_errno=MMERR_NOT_A_MODULE;
return 0;
}
if(!(of.instruments=(INSTRUMENT*)_mm_calloc(of.numins,sizeof(INSTRUMENT))))
return 0;
for(t=0;t<of.numins;t++) {
for(n=0;n<INSTNOTES;n++) {
/* Init note / sample lookup table */
of.instruments[t].samplenote[n] = n;
of.instruments[t].samplenumber[n] = t;
}
of.instruments[t].globvol = 64;
}
return 1;
}
BOOL AllocSamples(void)
{
UWORD u;
if(!of.numsmp) {
_mm_errno=MMERR_NOT_A_MODULE;
return 0;
}
if(!(of.samples=(SAMPLE*)_mm_calloc(of.numsmp,sizeof(SAMPLE)))) return 0;
for(u=0;u<of.numsmp;u++) {
of.samples[u].panning = 128; /* center */
of.samples[u].handle = -1;
of.samples[u].globvol = 64;
of.samples[u].volume = 64;
}
return 1;
}
static BOOL ML_LoadSamples(void)
{
SAMPLE *s;
int u;
for(u=of.numsmp,s=of.samples;u;u--,s++)
if(s->length) SL_RegisterSample(s,MD_MUSIC,modreader);
return 1;
}
/* Creates a CSTR out of a character buffer of 'len' bytes, but strips any
terminating non-printing characters like 0, spaces etc. */
CHAR *DupStr(CHAR* s,UWORD len,BOOL strict)
{
UWORD t;
CHAR *d=NULL;
/* Scan for last printing char in buffer [includes high ascii up to 254] */
while(len) {
if(s[len-1]>0x20) break;
len--;
}
/* Scan forward for possible NULL character */
if(strict) {
for(t=0;t<len;t++) if (!s[t]) break;
if (t<len) len=t;
}
/* When the buffer wasn't completely empty, allocate a cstring and copy the
buffer into that string, except for any control-chars */
if((d=(CHAR*)_mm_malloc(sizeof(CHAR)*(len+1)))) {
for(t=0;t<len;t++) d[t]=(s[t]<32)?'.':s[t];
d[len]=0;
}
return d;
}
static void ML_XFreeSample(SAMPLE *s)
{
if(s->handle>=0)
MD_SampleUnload(s->handle);
if(s->samplename) free(s->samplename);
}
static void ML_XFreeInstrument(INSTRUMENT *i)
{
if(i->insname) free(i->insname);
}
static void ML_FreeEx(MODULE *mf)
{
UWORD t;
if(mf->songname) free(mf->songname);
if(mf->comment) free(mf->comment);
if(mf->modtype) free(mf->modtype);
if(mf->positions) free(mf->positions);
if(mf->patterns) free(mf->patterns);
if(mf->pattrows) free(mf->pattrows);
if(mf->tracks) {
for(t=0;t<mf->numtrk;t++)
if(mf->tracks[t]) free(mf->tracks[t]);
free(mf->tracks);
}
if(mf->instruments) {
for(t=0;t<mf->numins;t++)
ML_XFreeInstrument(&mf->instruments[t]);
free(mf->instruments);
}
if(mf->samples) {
for(t=0;t<mf->numsmp;t++)
if(mf->samples[t].length) ML_XFreeSample(&mf->samples[t]);
free(mf->samples);
}
memset(mf,0,sizeof(MODULE));
if(mf!=&of) free(mf);
}
static MODULE *ML_AllocUniMod(void)
{
MODULE *mf;
return (mf=_mm_malloc(sizeof(MODULE)));
}
void Player_Free_internal(MODULE *mf)
{
if(mf) {
Player_Exit_internal(mf);
ML_FreeEx(mf);
}
}
MIKMODAPI void Player_Free(MODULE *mf)
{
MUTEX_LOCK(vars);
Player_Free_internal(mf);
MUTEX_UNLOCK(vars);
}
static CHAR* Player_LoadTitle_internal(MREADER *reader)
{
MLOADER *l;
modreader=reader;
_mm_errno = 0;
_mm_critical = 0;
_mm_iobase_setcur(modreader);
/* Try to find a loader that recognizes the module */
for(l=firstloader;l;l=l->next) {
_mm_rewind(modreader);
if(l->Test()) break;
}
if(!l) {
_mm_errno = MMERR_NOT_A_MODULE;
if(_mm_errorhandler) _mm_errorhandler();
return NULL;
}
return l->LoadTitle();
}
MIKMODAPI CHAR* Player_LoadTitleFP(FILE *fp)
{
CHAR* result=NULL;
MREADER* reader;
if(fp && (reader=_mm_new_file_reader(fp))) {
MUTEX_LOCK(lists);
result=Player_LoadTitle_internal(reader);
MUTEX_UNLOCK(lists);
_mm_delete_file_reader(reader);
}
return result;
}
MIKMODAPI CHAR* Player_LoadTitle(CHAR* filename)
{
CHAR* result=NULL;
FILE* fp;
MREADER* reader;
if((fp=_mm_fopen(filename,"rb"))) {
if((reader=_mm_new_file_reader(fp))) {
MUTEX_LOCK(lists);
result=Player_LoadTitle_internal(reader);
MUTEX_UNLOCK(lists);
_mm_delete_file_reader(reader);
}
_mm_fclose(fp);
}
return result;
}
/* Loads a module given an reader */
MODULE* Player_LoadGeneric_internal(MREADER *reader,int maxchan,BOOL curious)
{
int t;
MLOADER *l;
BOOL ok;
MODULE *mf;
modreader = reader;
_mm_errno = 0;
_mm_critical = 0;
_mm_iobase_setcur(modreader);
/* Try to find a loader that recognizes the module */
for(l=firstloader;l;l=l->next) {
_mm_rewind(modreader);
if(l->Test()) break;
}
if(!l) {
_mm_errno = MMERR_NOT_A_MODULE;
if(_mm_errorhandler) _mm_errorhandler();
_mm_rewind(modreader);_mm_iobase_revert();
return NULL;
}
/* init unitrk routines */
if(!UniInit()) {
if(_mm_errorhandler) _mm_errorhandler();
_mm_rewind(modreader);_mm_iobase_revert();
return NULL;
}
/* init the module structure with vanilla settings */
memset(&of,0,sizeof(MODULE));
of.bpmlimit = 33;
of.initvolume = 128;
for (t = 0; t < UF_MAXCHAN; t++) of.chanvol[t] = 64;
for (t = 0; t < UF_MAXCHAN; t++)
of.panning[t] = ((t + 1) & 2) ? PAN_RIGHT : PAN_LEFT;
/* init module loader and load the header / patterns */
if (!l->Init || l->Init()) {
_mm_rewind(modreader);
ok = l->Load(curious);
/* propagate inflags=flags for in-module samples */
for (t = 0; t < of.numsmp; t++)
if (of.samples[t].inflags == 0)
of.samples[t].inflags = of.samples[t].flags;
} else
ok = 0;
/* free loader and unitrk allocations */
if (l->Cleanup) l->Cleanup();
UniCleanup();
if(!ok) {
ML_FreeEx(&of);
if(_mm_errorhandler) _mm_errorhandler();
_mm_rewind(modreader);_mm_iobase_revert();
return NULL;
}
if(!ML_LoadSamples()) {
ML_FreeEx(&of);
if(_mm_errorhandler) _mm_errorhandler();
_mm_rewind(modreader);_mm_iobase_revert();
return NULL;
}
if(!(mf=ML_AllocUniMod())) {
ML_FreeEx(&of);
_mm_rewind(modreader);_mm_iobase_revert();
if(_mm_errorhandler) _mm_errorhandler();
return NULL;
}
/* If the module doesn't have any specific panning, create a
MOD-like panning, with the channels half-separated. */
if (!(of.flags & UF_PANNING))
for (t = 0; t < of.numchn; t++)
of.panning[t] = ((t + 1) & 2) ? PAN_HALFRIGHT : PAN_HALFLEFT;
/* Copy the static MODULE contents into the dynamic MODULE struct. */
memcpy(mf,&of,sizeof(MODULE));
if(maxchan>0) {
if(!(mf->flags&UF_NNA)&&(mf->numchn<maxchan))
maxchan = mf->numchn;
else
if((mf->numvoices)&&(mf->numvoices<maxchan))
maxchan = mf->numvoices;
if(maxchan<mf->numchn) mf->flags |= UF_NNA;
if(MikMod_SetNumVoices_internal(maxchan,-1)) {
_mm_iobase_revert();
Player_Free(mf);
return NULL;
}
}
if(SL_LoadSamples()) {
_mm_iobase_revert();
Player_Free_internal(mf);
return NULL;
}
if(Player_Init(mf)) {
_mm_iobase_revert();
Player_Free_internal(mf);
mf=NULL;
}
_mm_iobase_revert();
return mf;
}
MIKMODAPI MODULE* Player_LoadGeneric(MREADER *reader,int maxchan,BOOL curious)
{
MODULE* result;
MUTEX_LOCK(vars);
MUTEX_LOCK(lists);
result=Player_LoadGeneric_internal(reader,maxchan,curious);
MUTEX_UNLOCK(lists);
MUTEX_UNLOCK(vars);
return result;
}
/* Loads a module given a file pointer.
File is loaded from the current file seek position. */
MIKMODAPI MODULE* Player_LoadFP(FILE* fp,int maxchan,BOOL curious)
{
MODULE* result=NULL;
struct MREADER* reader=_mm_new_file_reader (fp);
if (reader) {
result=Player_LoadGeneric(reader,maxchan,curious);
_mm_delete_file_reader(reader);
}
return result;
}
/* Open a module via its filename. The loader will initialize the specified
song-player 'player'. */
MIKMODAPI MODULE* Player_Load(CHAR* filename,int maxchan,BOOL curious)
{
FILE *fp;
MODULE *mf=NULL;
if((fp=_mm_fopen(filename,"rb"))) {
mf=Player_LoadFP(fp,maxchan,curious);
_mm_fclose(fp);
}
return mf;
}
/* ex:set ts=4: */
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