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|
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <malloc.h>
#define MAXNO 32767
#define MAXLEN 127
#define XXQSCAN /* Speed up scanning at the cost of not being optimal */
unsigned char *fptr;
unsigned short *vptr;
FILE * fd;
#define ITBSIZE 4096
#define itbfunc() (ptr[mainscan]^(ptr[mainscan+1]<<4)^(ptr[mainscan+2]<<2))
/*
#define ITBSIZE 4001
#define itbfunc() ((ptr[mainscan]+ptr[mainscan+1]*79+ptr[mainscan+2]*307)%4001)
*/
int * itb;
int size;
int maxno= 8000;
long cnt=0;
long icount = 0;
long ocount = 0;
unsigned char key;
int fl;
main(argc, argv)
int argc;
char ** argv;
{
if( argc < 2 ) { fprintf(stderr, "Usage; ... \n"); exit(1); }
if( argc == 3 )
{
maxno = atoi(argv[2]);
if( maxno < 256 ) maxno = 256;
if( maxno > MAXNO) maxno = MAXNO;
}
if( strcmp(argv[1], "-") == 0 )
fd = stdin;
else
fd = fopen(argv[1], "r" );
if( fd == 0 ) { perror("Open failed\n"); exit(1); }
fptr = (unsigned char * ) malloc((unsigned)maxno*2);
itb = (int * ) malloc(ITBSIZE*sizeof(int));
if( itb )
vptr = (unsigned short * ) malloc((unsigned)maxno * sizeof(short)*2 );
else
vptr = 0;
if( fptr == 0 )
{
perror("Cannot allocate RAM");
exit(1);
}
if( vptr == 0 && itb ) free(itb);
fl = 0;
{
if( (size = fread(fptr, 1, (int)maxno, fd )) < 0 ) { fprintf(stderr, "\nRead failed\n"); exit(1); }
if( size )
{
icount += size;
if( fl == 0 )
{
key = scan_min();
putchar(key); ocount++;
fl = 1;
}
else
fprintf(stderr, "\rBlock %d \r", fl++ );
if( vptr) compress();
else slo_compress();
}
}
fprintf(stderr, "\n");
exit(0);
}
scan_min()
{
long count[256];
long i;
int j, n;
for( j=0; j<256; j++ ) count[j] = 0;
for( i=0; i<size; i++) count[ fptr[i] & 0xFF ]++;
for( i= (((unsigned long) -1) >> 1), j=0; j<256; j++ )
if( count[j] < i )
{
i = count[j] ;
n = j;
}
fprintf(stderr, "Most unused in 0x%lx to 0x%lx is 0x%02x at %ld\n", cnt, cnt+size, n, i );
cnt+= size;
return n;
}
compress()
{
register long mainscan;
register long secondscan;
register unsigned char * ptr = (unsigned char * ) fptr;
register int len;
register int matchlen;
long notepos;
long emark;
#ifdef QSCAN
int count;
#endif
for( mainscan=0; mainscan <ITBSIZE; itb[mainscan++] = -1 );
mainscan=0;
emark = size - 130 ;
loopback:
for( ; mainscan < emark; )
{
matchlen = 3;
notepos = -1;
#ifdef QSCAN
count = 0;
#endif
for( secondscan=itb[itbfunc()];
secondscan >= 0 && mainscan - secondscan < maxno;
secondscan -= vptr[secondscan] )
{
#ifdef DEBUG
if( vptr[secondscan] == 0 )
{
fprintf(stderr, "\nOh !!!!! mainsc %ld, sec-scan %ld\n", mainscan, secondscan);
vptr[secondscan] = secondscan+1;
}
#endif
for( len = 0; len < MAXLEN ; len++ )
if( mainscan+len >= size || ptr[mainscan+len] != ptr[secondscan+len] ) break;
if( len > matchlen && (len != 4 || mainscan - secondscan < 256 ) )
{
notepos = secondscan;
matchlen = len;
if( len == MAXLEN ) break;
}
#ifdef QSCAN
if( matchlen > 20 && len > 3 && ++count > 5 )
break;
#endif
}
if( notepos == -1 )
{
if( ptr[mainscan] == key )
{
ocount+=2;
putchar(key);
putchar(0);
}
else
{
ocount++;
putchar(ptr[mainscan]);
}
matchlen = 1;
}
else
{
long x = mainscan - notepos;
ocount+=3;
putchar(key);
if( x > 255 ) putchar(matchlen | 0x80);
else putchar(matchlen);
putchar((int)x);
if( x > 255 ) { putchar((int)x>>8); ocount++; }
}
while( matchlen-- )
{
len = itbfunc();
vptr[mainscan] = mainscan - itb[len];
#if 1
if( vptr[mainscan] == 0 )
{
fprintf(stderr, "\nHumm.. ms=%ld, hash=%d, itb[hash]=%ld\n", mainscan, len, itb[len]);
vptr[mainscan] = mainscan+1;
}
#endif
itb[len] = mainscan;
mainscan++;
}
}
fprintf(stderr, "\rBlock %d ..In:%ld Out:%ld \r", fl-1, icount, ocount );
if( emark < size-4 )
{
int cnt;
long l ;
if(mainscan > maxno )
{
for(cnt=0; cnt<ITBSIZE; cnt++)
{
if( itb[cnt] < maxno) itb[cnt] = -1;
else itb[cnt] -= maxno;
}
for(l=0; l<maxno; l++)
{
ptr[l] = ptr[l+maxno];
vptr[l] = vptr[l+maxno];
}
mainscan -= maxno;
size -= maxno;
}
if( size <= maxno )
{
if(( cnt = fread(ptr+size, 1, (int)maxno, fd)) < 0 )
{ fprintf(stderr, "\nRead failed\n"); exit(1); }
size += cnt;
icount += cnt;
fprintf(stderr, "\rBlock %d \r", fl++ );
}
emark = size - 130;
if( mainscan >= emark )
emark = size -4;
goto loopback;
}
for( ; mainscan < size; )
{
if( ptr[mainscan] == key )
{
ocount+=2;
putchar(key);
putchar(0);
}
else
{
ocount++;
putchar(fptr[mainscan]);
}
mainscan++;
}
fprintf(stderr, "\rBlock %d ..In:%ld Out:%ld \r", fl-1, icount, ocount );
/* end */
}
slo_compress()
{
register long mainscan;
register long secondscan;
register unsigned char * ptr = (unsigned char * ) fptr;
register int len;
register int matchlen;
long notepos;
long emark;
#ifdef QSCAN
int count;
#endif
mainscan=0;
emark = size - 130 ;
loopback:
for( ; mainscan < emark; )
{
matchlen = 3;
notepos = -1;
#ifdef QSCAN
count = 0;
#endif
for( secondscan=mainscan-1;
secondscan >= 0 && mainscan - secondscan < maxno;
secondscan-- )
{
for( len = 0; len < MAXLEN ; len++ )
if( mainscan+len >= size || ptr[mainscan+len] != ptr[secondscan+len] ) break;
if( len > matchlen && (len != 4 || mainscan - secondscan < 256 ) )
{
notepos = secondscan;
matchlen = len;
if( len == MAXLEN ) break;
}
#ifdef QSCAN
if( matchlen > 20 && len > 3 && ++count > 5 )
break;
#endif
}
if( notepos == -1 )
{
if( ptr[mainscan] == key )
{
ocount+=2;
putchar(key);
putchar(0);
}
else
{
ocount++;
putchar(ptr[mainscan]);
}
matchlen = 1;
}
else
{
long x = mainscan - notepos;
ocount+=3;
putchar(key);
if( x > 255 ) putchar(matchlen | 0x80);
else putchar(matchlen);
putchar((int)x);
if( x > 255 ) { putchar((int)x>>8); ocount++; }
}
mainscan += matchlen;
}
fprintf(stderr, "\rBlock %d ..In:%ld Out:%ld \r", fl-1, icount, ocount );
if( emark < size-4 )
{
int cnt;
long l ;
if(mainscan > maxno )
{
for(l=0; l<maxno; l++)
{
ptr[l] = ptr[l+maxno];
}
mainscan -= maxno;
size -= maxno;
}
if( size <= maxno )
{
if(( cnt = fread(ptr+size, 1, (int)maxno, fd)) < 0 )
{ fprintf(stderr, "\nRead failed\n"); exit(1); }
size += cnt;
icount += cnt;
fprintf(stderr, "\rBlock %d \r", fl++ );
}
emark = size - 130;
if( mainscan >= emark )
emark = size -4;
goto loopback;
}
for( ; mainscan < size; )
{
if( ptr[mainscan] == key )
{
ocount+=2;
putchar(key);
putchar(0);
}
else
{
ocount++;
putchar(fptr[mainscan]);
}
mainscan++;
}
fprintf(stderr, "\rBlock %d ..In:%ld Out:%ld \r", fl-1, icount, ocount );
/* end */
}
|
