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/* Zgv v2.7 - GIF, JPEG and PBM/PGM/PPM viewer, for VGA PCs running Linux.
* Copyright (C) 1993-1995 Russell Marks. See README for license details.
*
* readpcx.c - PCX decoder. This is a quick hack so I can use/index a
* clip-art CD directly. :-)
*/
/* XXX this could be leaking memory, needs to be checked */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "zgv.h"
struct pcxhed
{
byte manuf,ver,encod,bpp; /* 0 - 3 gen format */
byte x1lo,x1hi,y1lo,y1hi; /* 4 - 11 size */
byte x2lo,x2hi,y2lo,y2hi;
byte unused1[4]; /* 12 - 15 scrn size */
byte pal16[48]; /* 16 - 63 4-bit palette */
byte reserved; /* 64 reserved */
byte nplanes; /* 65 num of bitplanes */
byte bytelinelo,bytelinehi; /* 66 - 67 bytes per line */
byte unused2[60]; /* 68 - 127 unused */
}; /* palette info is after image data */
/* for aborted_file_pcx_cleanup() */
static unsigned char *work_bmap,*work_pal;
static FILE *work_in;
/* prototypes */
void dispbyte(unsigned char *ptr,int *xp,int *yp,int c,int w,int h,
int is_mono,int byteline,int pmask);
int read_pcx_file(char *filename,hffunc howfarfunc,unsigned char **bmap,
unsigned char **pal,int *output_type,PICINFO *pp)
{
FILE *in;
int w,h,bytepp,x,y,yy,byteline,plane,pmask;
unsigned char *ptr;
struct pcxhed header;
int count,waste;
long bytemax,bytesdone;
byte inbyte,inbyte2;
int is_mono=0;
*bmap=NULL;
*pal=NULL;
if((in=fopen(filename,"rb"))==NULL)
return(_PICERR_NOFILE);
fread(&header,1,sizeof(struct pcxhed),in);
if(header.manuf!=10 || header.encod!=1 || (header.bpp!=8 && header.bpp!=1))
return(_PICERR_UNSUPPORTED);
if(header.bpp==1) is_mono=1;
if(header.nplanes>1) is_mono=2;
bytepp=1;
if((*pal=malloc(768))==NULL)
return(_PICERR_NOMEM);
w=(header.x2lo+256*header.x2hi)-(header.x1lo+256*header.x1hi)+1;
h=(header.y2lo+256*header.y2hi)-(header.y1lo+256*header.y1hi)+1;
byteline=header.bytelinelo+256*header.bytelinehi;
if(w==0 || h==0)
return(_PICERR_CORRUPT);
x=0; y=0;
bytemax=w*h;
if(is_mono)
bytemax=(1<<30); /* we use a 'y<h' test instead for mono files */
/* the normal +2 lines in case we ever do 24-bit, for dithering */
if((*bmap=malloc(w*(h+2)*bytepp))==NULL)
return(_PICERR_NOMEM);
/* need this if more than one bitplane */
memset(*bmap,0,w*h*bytepp);
bytesdone=0;
ptr=*bmap;
/* save stuff in case of abort */
work_in=in; work_bmap=ptr; work_pal=*pal;
/* start reading image */
for(yy=0;yy<h;yy++)
{
if(howfarfunc!=NULL) howfarfunc(y,h);
for(plane=0,pmask=1;plane<header.nplanes;plane++,pmask<<=1)
{
y=yy;
x=0;
while(y==yy)
{
inbyte=fgetc(in);
if(inbyte<192)
{
dispbyte(ptr,&x,&y,inbyte,w,h,is_mono,byteline,pmask);
bytesdone++;
}
else
{
inbyte2=fgetc(in);
inbyte&=63;
for(count=0;count<inbyte;count++)
dispbyte(ptr,&x,&y,inbyte2,w,h,is_mono,byteline,pmask);
bytesdone+=inbyte;
}
}
}
}
if(is_mono)
{
/* mono or 4-bit */
if(is_mono>1)
{
/* 4-bit, palette is embedded in header */
ptr=*pal;
for(x=0;x<16;x++)
{
ptr[ 0]=header.pal16[x*3 ];
ptr[256]=header.pal16[x*3+1];
ptr[512]=header.pal16[x*3+2];
ptr++;
}
}
else
{
ptr=*pal;
ptr[0]=ptr[256]=ptr[512]=0;
ptr[1]=ptr[257]=ptr[513]=255;
}
}
else
{
/* 8-bit */
waste=fgetc(in); /* ditch splitter byte */
/* palette already allocated */
ptr=*pal;
for(x=0;x<256;x++)
{
ptr[0] =fgetc(in);
ptr[256]=fgetc(in);
ptr[512]=fgetc(in);
ptr++;
}
}
pp->width=w;
pp->height=h;
pp->numcols=(is_mono?(1<<header.nplanes):256);
*output_type=bytepp;
fclose(in);
return(_PIC_OK);
}
void dispbyte(unsigned char *ptr,int *xp,int *yp,int c,int w,int h,
int is_mono,int byteline,int pmask)
{
if(is_mono)
{
/* mono or 4-bit */
int f;
unsigned char *dstptr;
if((*yp)>=h) return;
dstptr=ptr+(*yp)*w+*xp;
w=byteline*8;
for(f=0;f<8;f++)
{
*dstptr++|=(c&(0x80>>(f&7)))?pmask:0;
(*xp)++; if(*xp>=w) { (*xp)=0,(*yp)++; return; }
if((*yp)>=h) return;
}
}
else
{
/* 8-bit */
*(ptr+(*yp)*w+*xp)=c;
(*xp)++; if(*xp>=w) (*xp)=0,(*yp)++;
}
}
void aborted_file_pcx_cleanup()
{
free(work_bmap);
free(work_pal);
fclose(work_in);
}
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