Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
[linux-2.6] / lib / zlib_inflate / infutil.c
1 #include <linux/zutil.h>
2 #include <linux/errno.h>
3 #include <linux/slab.h>
4 #include <linux/vmalloc.h>
5
6 /* Utility function: initialize zlib, unpack binary blob, clean up zlib,
7  * return len or negative error code.
8  */
9 int zlib_inflate_blob(void *gunzip_buf, unsigned int sz,
10                       const void *buf, unsigned int len)
11 {
12         const u8 *zbuf = buf;
13         struct z_stream_s *strm;
14         int rc;
15
16         rc = -ENOMEM;
17         strm = kmalloc(sizeof(*strm), GFP_KERNEL);
18         if (strm == NULL)
19                 goto gunzip_nomem1;
20         strm->workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
21         if (strm->workspace == NULL)
22                 goto gunzip_nomem2;
23
24         /* gzip header (1f,8b,08... 10 bytes total + possible asciz filename)
25          * expected to be stripped from input
26          */
27         strm->next_in = zbuf;
28         strm->avail_in = len;
29         strm->next_out = gunzip_buf;
30         strm->avail_out = sz;
31
32         rc = zlib_inflateInit2(strm, -MAX_WBITS);
33         if (rc == Z_OK) {
34                 rc = zlib_inflate(strm, Z_FINISH);
35                 /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
36                 if (rc == Z_STREAM_END)
37                         rc = sz - strm->avail_out;
38                 else
39                         rc = -EINVAL;
40                 zlib_inflateEnd(strm);
41         } else
42                 rc = -EINVAL;
43
44         kfree(strm->workspace);
45 gunzip_nomem2:
46         kfree(strm);
47 gunzip_nomem1:
48         return rc; /* returns Z_OK (0) if successful */
49 }