Category : UNIX Files
Archive : UNIX-SQ.ZIP
Filename : UTR.C
Output of file : UTR.C contained in archive : UNIX-SQ.ZIP
#include "sqcom.h"
#include "usq.h"
#define ERROR -1
/* initialize decoding functions */
init_cr()
{
repct = 0;
}
init_huff()
{
bpos = 99; /* force initial read */
}
/* Get bytes with decoding - this decodes repetition,
* calls getuhuff to decode file stream into byte
* level code with only repetition encoding.
*
* The code is simple passing through of bytes except
* that DLE is encoded as DLE-zero and other values
* repeated more than twice are encoded as value-DLE-count.
*/
int
getcr(ib)
FILE *ib;
{
int c;
if(repct > 0) {
/* Expanding a repeated char */
--repct;
return (value);
} else {
/* Nothing unusual */
if((c = getuhuff(ib)) != DLE) {
/* It's not the special delimiter */
value = c;
if(value == EOF)
repct = LARGE;
return (value);
} else {
/* Special token */
if((repct = getuhuff(ib)) == 0)
/* DLE, zero represents DLE */
return (DLE);
else {
/* Begin expanding repetition */
repct -= 2; /* 2nd time */
return (value);
}
}
}
}
/* eject eject */
/* Decode file stream into a byte level code with only
* repetition encoding remaining.
*/
int
getuhuff(ib)
FILE *ib;
{
int i;
int bitval;
/* Follow bit stream in tree to a leaf*/
i = 0; /* Start at root of tree */
do {
if(++bpos > 7) {
if((curin = getc(ib)) == ERROR)
return (ERROR);
bpos = 0;
/* move a level deeper in tree */
i = dnode[i].children[1 & curin];
} else
i = dnode[i].children[1 & (curin >>= 1)];
} while(i >= 0);
/* Decode fake node index to original data value */
i = -(i + 1);
/* Decode special endfile token to normal EOF */
i = (i == SPEOF) ? EOF : i;
return (i);
}
Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!
This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/