Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <flate.h>

typedef struct Block    Block;

struct Block
{
        uchar   *pos;
        uchar   *limit;
};

static int
blread(void *vb, void *buf, int n)
{
        Block *b;

        b = vb;
        if(n > b->limit - b->pos)
                n = b->limit - b->pos;
        memmove(buf, b->pos, n);
        b->pos += n;
        return n;
}

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
deflateblock(uchar *dst, int dsize, uchar *src, int ssize, int level, int debug)
{
        Block bd, bs;
        int ok;

        bs.pos = src;
        bs.limit = src + ssize;

        bd.pos = dst;
        bd.limit = dst + dsize;

        ok = deflate(&bd, blwrite, &bs, blread, level, debug);
        if(ok != FlateOk)
                return ok;
        return bd.pos - dst;
}