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#include <linux/zutil.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
/* Utility function: initialize zlib, unpack binary blob, clean up zlib,
* return len or negative error code.
*/
int zlib_inflate_blob(void *gunzip_buf, unsigned int sz,
const void *buf, unsigned int len)
{
const u8 *zbuf = buf;
struct z_stream_s *strm;
int rc;
rc = -ENOMEM;
strm = kmalloc(sizeof(*strm), GFP_KERNEL);
if (strm == NULL)
goto gunzip_nomem1;
strm->workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
if (strm->workspace == NULL)
goto gunzip_nomem2;
/* gzip header (1f,8b,08... 10 bytes total + possible asciz filename)
* expected to be stripped from input
*/
strm->next_in = zbuf;
strm->avail_in = len;
strm->next_out = gunzip_buf;
strm->avail_out = sz;
rc = zlib_inflateInit2(strm, -MAX_WBITS);
if (rc == Z_OK) {
rc = zlib_inflate(strm, Z_FINISH);
/* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
if (rc == Z_STREAM_END)
rc = sz - strm->avail_out;
else
rc = -EINVAL;
zlib_inflateEnd(strm);
} else
rc = -EINVAL;
kfree(strm->workspace);
gunzip_nomem2:
kfree(strm);
gunzip_nomem1:
return rc; /* returns Z_OK (0) if successful */
}
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