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/* nomarch 1.0 - extract old `.arc' archives.
* Copyright (C) 2001 Russell Marks. See main.c for license details.
*
* readrle.c - read RLE-compressed files.
*
* Also provides the generic outputrle() for the other RLE-using methods
* to use.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "readrle.h"
static unsigned char *data_in_point,*data_in_max;
static unsigned char *data_out_point,*data_out_max;
static void rawoutput(int byte)
{
if(data_out_point<data_out_max)
*data_out_point++=byte;
}
/* call with -1 before starting, to make sure state is initialised */
void outputrle(int chr,void (*outputfunc)(int))
{
static int lastchr=0,repeating=0;
int f;
if(chr==-1)
{
lastchr=repeating=0;
return;
}
if(repeating)
{
if(chr==0)
(*outputfunc)(0x90);
else
for(f=1;f<chr;f++)
(*outputfunc)(lastchr);
repeating=0;
}
else
{
if(chr==0x90)
repeating=1;
else
{
(*outputfunc)(chr);
lastchr=chr;
}
}
}
unsigned char *convert_rle(unsigned char *data_in,
unsigned long in_len,
unsigned long orig_len)
{
unsigned char *data_out;
if((data_out=malloc(orig_len))==NULL)
fprintf(stderr,"nomarch: out of memory!\n"),exit(1);
data_in_point=data_in; data_in_max=data_in+in_len;
data_out_point=data_out; data_out_max=data_out+orig_len;
outputrle(-1,NULL);
while(data_in_point<data_in_max)
outputrle(*data_in_point++,rawoutput);
return(data_out);
}
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