puff.h File Reference

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Macros
#define	NIL   ((unsigned char *)0) /* for no output option */

Functions
int	puff (unsigned char *dest, unsigned long *destlen, const unsigned char *source, unsigned long *sourcelen)

Macro Definition Documentation

NIL

#define NIL   ((unsigned char *)0) /* for no output option */

Definition at line 29 of file puff.h.

Function Documentation

puff()

int puff	(	unsigned char *	dest,
		unsigned long *	destlen,
		const unsigned char *	source,
		unsigned long *	sourcelen
	)

Definition at line 793 of file puff.c.

{
    struct state s;             /* input/output state */
    int last, type;             /* block information */
    int err;                    /* return value */
 
    /* initialize output state */
    s.out = dest;
    s.outlen = *destlen;                /* ignored if dest is NIL */
    s.outcnt = 0;
 
    /* initialize input state */
    s.in = source;
    s.inlen = *sourcelen;
    s.incnt = 0;
    s.bitbuf = 0;
    s.bitcnt = 0;
 
    /* return if bits() or decode() tries to read past available input */
    if (setjmp(s.env) != 0)             /* if came back here via longjmp() */
        err = 2;                        /* then skip do-loop, return error */
    else {
        /* process blocks until last block or error */
        do {
            last = bits(&s, 1);         /* one if last block */
            type = bits(&s, 2);         /* block type 0..3 */
            err = type == 0 ?
                    stored(&s) :
                    (type == 1 ?
                        fixed(&s) :
                        (type == 2 ?
                            dynamic(&s) :
                            -1));       /* type == 3, invalid */
            if (err != 0)
                break;                  /* return with error */
        } while (!last);
    }
 
    /* update the lengths and return */
    if (err <= 0) {
        *destlen = s.outcnt;
        *sourcelen = s.incnt;
    }
    return err;
}

References bits(), dest, dynamic(), err, fixed(), s, source, stored(), and type.

Referenced by main().