jehanne/sys/src/lib/flate/inflateblock.c

55 lines
694 B
C

#include <u.h>
#include <lib9.h>
#include <flate.h>
typedef struct Block Block;
struct Block
{
uint8_t *pos;
uint8_t *limit;
};
static int
blgetc(void *vb)
{
Block *b;
b = vb;
if(b->pos >= b->limit)
return -1;
return *b->pos++;
}
static int
blwrite(void *vb, void *buf, int n)
{
Block *b;
b = vb;
if(n > b->limit - b->pos)
n = b->limit - b->pos;
memmove(b->pos, buf, n);
b->pos += n;
return n;
}
int
inflateblock(uint8_t *dst, int dsize, uint8_t *src, int ssize)
{
Block bd, bs;
int ok;
bs.pos = src;
bs.limit = src + ssize;
bd.pos = dst;
bd.limit = dst + dsize;
ok = inflate(&bd, blwrite, &bs, blgetc);
if(ok != FlateOk)
return ok;
return bd.pos - dst;
}