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LARC.C
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C/C++ Source or Header
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1993-03-04
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2KB
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93 lines
/***********************************************************
larc.c -- extract *.lzs
***********************************************************/
#include "lh386.h"
#include <stdio.h>
#include <string.h>
#include "slidehuf.h"
#ifdef __HIGHC__
# pragma On(Align_labels);
#endif
#define MAGIC0 18
#define MAGIC5 19
static int flag = 0, flagcnt = 0, matchpos = 0;
ushort decode_c_lzs(void)
{
if (getbits(1))
{
return getbits(8);
} else
{
matchpos = getbits(11);
return getbits(4) + 0x100;
}
}
ushort decode_p_lzs(int loc)
{
return (loc - matchpos - MAGIC0) & 0x7ff;
}
void decode_start_lzs(void)
{
init_getbits();
}
ushort decode_c_lz5(void)
{
int c;
if (flagcnt == 0)
{
flagcnt = 8;
flag = getc(infile) & 0xFF;
}
flagcnt--;
c = getc(infile) & 0xFF;
if ((flag & 1) == 0)
{
matchpos = c;
c = getc(infile) & 0xFF;
matchpos += (c & 0xf0) << 4;
c &= 0x0f;
c += 0x100;
}
flag >>= 1;
return c;
}
ushort decode_p_lz5(int loc)
{
return (loc - matchpos - MAGIC5) & 0xfff;
}
void decode_start_lz5(void)
{
int i;
flagcnt = 0;
for (i = 0; i < 256; i++)
memset(&text[i * 13 + 18], i, 13);
for (i = 0; i < 256; i++)
text[256 * 13 + 18 + i] = i;
for (i = 0; i < 256; i++)
text[256 * 13 + 256 + 18 + i] = 255 - i;
memset(&text[256 * 13 + 512 + 18], 0, 128);
memset(&text[256 * 13 + 512 + 128 + 18], ' ', 128 - 18);
}
#ifdef _STARTUP_INIT
void larc_ini(void)
{
flag = 0;
flagcnt = 0;
matchpos = 0;
}
#endif