xref: /linux/include/linux/lzo.h (revision 597473720f4dc69749542bfcfed4a927a43d935e)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LZO_H__
3 #define __LZO_H__
4 /*
5  *  LZO Public Kernel Interface
6  *  A mini subset of the LZO real-time data compression library
7  *
8  *  Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
9  *
10  *  The full LZO package can be found at:
11  *  http://www.oberhumer.com/opensource/lzo/
12  *
13  *  Changed for Linux kernel use by:
14  *  Nitin Gupta <nitingupta910@gmail.com>
15  *  Richard Purdie <rpurdie@openedhand.com>
16  */
17 
18 #define LZO1X_1_MEM_COMPRESS	(8192 * sizeof(unsigned short))
19 #define LZO1X_MEM_COMPRESS	LZO1X_1_MEM_COMPRESS
20 
21 #define lzo1x_worst_compress(x) ((x) + ((x) / 16) + 64 + 3 + 2)
22 
23 /* This requires 'wrkmem' of size LZO1X_1_MEM_COMPRESS */
24 int lzo1x_1_compress(const unsigned char *src, size_t src_len,
25 		     unsigned char *dst, size_t *dst_len, void *wrkmem);
26 
27 /* This requires 'wrkmem' of size LZO1X_1_MEM_COMPRESS */
28 int lzorle1x_1_compress(const unsigned char *src, size_t src_len,
29 		     unsigned char *dst, size_t *dst_len, void *wrkmem);
30 
31 /* safe decompression with overrun testing */
32 int lzo1x_decompress_safe(const unsigned char *src, size_t src_len,
33 			  unsigned char *dst, size_t *dst_len);
34 
35 /*
36  * Return values (< 0 = Error)
37  */
38 #define LZO_E_OK			0
39 #define LZO_E_ERROR			(-1)
40 #define LZO_E_OUT_OF_MEMORY		(-2)
41 #define LZO_E_NOT_COMPRESSIBLE		(-3)
42 #define LZO_E_INPUT_OVERRUN		(-4)
43 #define LZO_E_OUTPUT_OVERRUN		(-5)
44 #define LZO_E_LOOKBEHIND_OVERRUN	(-6)
45 #define LZO_E_EOF_NOT_FOUND		(-7)
46 #define LZO_E_INPUT_NOT_CONSUMED	(-8)
47 #define LZO_E_NOT_YET_IMPLEMENTED	(-9)
48 #define LZO_E_INVALID_ARGUMENT		(-10)
49 
50 #endif
51