int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
{
int i, flags;
/* skip header */
i = 10;
flags = src[3];
if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
puts ("Error: Bad gzipped data\n");
return (-1);
}
if ((flags & EXTRA_FIELD) != 0)
i = 12 + src[10] + (src[11] << 8);
if ((flags & ORIG_NAME) != 0)
while (src[i++] != 0)
;
if ((flags & COMMENT) != 0)
while (src[i++] != 0)
;
if ((flags & HEAD_CRC) != 0)
i += 2;
if (i >= *lenp) {
puts ("Error: gunzip out of data in header\n");
return (-1);
}
return zunzip(dst, dstlen, src, lenp, 1, i);
}
/*
* We need a wrapper for zunzip() because the parameters are
* incompatible with the lzo decompressor.
*/
static int gzip_decompress(const unsigned char *in, size_t in_len,
unsigned char *out, size_t *out_len)
{
unsigned long len = in_len;
return zunzip(out, *out_len, (unsigned char *)in, &len, 0, 0);
}
