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32 results

infutil.c

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  • infutil.c 1.20 KiB
    #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 */
    }