static int
zf_read(struct open_file *f, void *buf, size_t size, size_t *resid)
{
struct z_file *zf = (struct z_file *)f->f_fsdata;
int error;
zf->zf_zstream.next_out = buf; /* where and how much */
zf->zf_zstream.avail_out = size;
while (zf->zf_zstream.avail_out && zf->zf_endseen == 0) {
if ((zf->zf_zstream.avail_in == 0) && (zf_fill(zf) == -1)) {
printf("zf_read: fill error\n");
return(EIO);
}
if (zf->zf_zstream.avail_in == 0) { /* oops, unexpected EOF */
printf("zf_read: unexpected EOF\n");
if (zf->zf_zstream.avail_out == size)
return(EIO);
break;
}
error = inflate(&zf->zf_zstream, Z_SYNC_FLUSH); /* decompression pass */
if (error == Z_STREAM_END) { /* EOF, all done */
zf->zf_endseen = 1;
break;
}
if (error != Z_OK) { /* argh, decompression error */
printf("inflate: %s\n", zf->zf_zstream.msg);
return(EIO);
}
}
if (resid != NULL)
*resid = zf->zf_zstream.avail_out;
return(0);
}
/*
* Adapted from get_byte/check_header in libz
*
* Returns 0 if the header is OK, nonzero if not.
*/
static int
get_byte(struct z_file *zf)
{
if ((zf->zf_zstream.avail_in == 0) && (zf_fill(zf) == -1))
return(-1);
zf->zf_zstream.avail_in--;
return(*(zf->zf_zstream.next_in)++);
}
