lzo.h

 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 */
24int lzo1x_1_compress(const unsigned char *src, size_t src_len,
25		     unsigned char *dst, size_t *dst_len, void *wrkmem);
26
27/* Same as above but does not write more than dst_len to dst. */
28int lzo1x_1_compress_safe(const unsigned char *src, size_t src_len,
29			  unsigned char *dst, size_t *dst_len, void *wrkmem);
30
31/* This requires 'wrkmem' of size LZO1X_1_MEM_COMPRESS */
32int lzorle1x_1_compress(const unsigned char *src, size_t src_len,
33		     unsigned char *dst, size_t *dst_len, void *wrkmem);
34
35/* Same as above but does not write more than dst_len to dst. */
36int lzorle1x_1_compress_safe(const unsigned char *src, size_t src_len,
37			     unsigned char *dst, size_t *dst_len, void *wrkmem);
38
39/* safe decompression with overrun testing */
40int lzo1x_decompress_safe(const unsigned char *src, size_t src_len,
41			  unsigned char *dst, size_t *dst_len);
42
43/*
44 * Return values (< 0 = Error)
45 */
46#define LZO_E_OK			0
47#define LZO_E_ERROR			(-1)
48#define LZO_E_OUT_OF_MEMORY		(-2)
49#define LZO_E_NOT_COMPRESSIBLE		(-3)
50#define LZO_E_INPUT_OVERRUN		(-4)
51#define LZO_E_OUTPUT_OVERRUN		(-5)
52#define LZO_E_LOOKBEHIND_OVERRUN	(-6)
53#define LZO_E_EOF_NOT_FOUND		(-7)
54#define LZO_E_INPUT_NOT_CONSUMED	(-8)
55#define LZO_E_NOT_YET_IMPLEMENTED	(-9)
56#define LZO_E_INVALID_ARGUMENT		(-10)
57
58#endif