1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* lz4defs.h -- architecture specific defines
*
* Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/*
* Detects 64 bits mode
*/
#if defined(CONFIG_64BIT)
#define LZ4_ARCH64 1
#else
#define LZ4_ARCH64 0
#endif
/*
* Architecture-specific macros
*/
#define BYTE u8
typedef struct _U16_S { u16 v; } U16_S;
typedef struct _U32_S { u32 v; } U32_S;
typedef struct _U64_S { u64 v; } U64_S;
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
#define A16(x) (((U16_S *)(x))->v)
#define A32(x) (((U32_S *)(x))->v)
#define A64(x) (((U64_S *)(x))->v)
#define PUT4(s, d) (A32(d) = A32(s))
#define PUT8(s, d) (A64(d) = A64(s))
#define LZ4_READ_LITTLEENDIAN_16(d, s, p) \
(d = s - A16(p))
#define LZ4_WRITE_LITTLEENDIAN_16(p, v) \
do { \
A16(p) = v; \
p += 2; \
} while (0)
#else /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */
#define A64(x) get_unaligned((u64 *)&(((U16_S *)(x))->v))
#define A32(x) get_unaligned((u32 *)&(((U16_S *)(x))->v))
#define A16(x) get_unaligned((u16 *)&(((U16_S *)(x))->v))
#define PUT4(s, d) \
put_unaligned(get_unaligned((const u32 *) s), (u32 *) d)
#define PUT8(s, d) \
put_unaligned(get_unaligned((const u64 *) s), (u64 *) d)
#define LZ4_READ_LITTLEENDIAN_16(d, s, p) \
(d = s - get_unaligned_le16(p))
#define LZ4_WRITE_LITTLEENDIAN_16(p, v) \
do { \
put_unaligned_le16(v, (u16 *)(p)); \
p += 2; \
} while (0)
#endif
#define COPYLENGTH 8
#define ML_BITS 4
#define ML_MASK ((1U << ML_BITS) - 1)
#define RUN_BITS (8 - ML_BITS)
#define RUN_MASK ((1U << RUN_BITS) - 1)
#define MEMORY_USAGE 14
#define MINMATCH 4
#define SKIPSTRENGTH 6
#define LASTLITERALS 5
#define MFLIMIT (COPYLENGTH + MINMATCH)
#define MINLENGTH (MFLIMIT + 1)
#define MAXD_LOG 16
#define MAXD (1 << MAXD_LOG)
#define MAXD_MASK (u32)(MAXD - 1)
#define MAX_DISTANCE (MAXD - 1)
#define HASH_LOG (MAXD_LOG - 1)
#define HASHTABLESIZE (1 << HASH_LOG)
#define MAX_NB_ATTEMPTS 256
#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
#define LZ4_64KLIMIT ((1<<16) + (MFLIMIT - 1))
#define HASHLOG64K ((MEMORY_USAGE - 2) + 1)
#define HASH64KTABLESIZE (1U << HASHLOG64K)
#define LZ4_HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \
((MINMATCH * 8) - (MEMORY_USAGE-2)))
#define LZ4_HASH64K_VALUE(p) (((A32(p)) * 2654435761U) >> \
((MINMATCH * 8) - HASHLOG64K))
#define HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \
((MINMATCH * 8) - HASH_LOG))
#if LZ4_ARCH64/* 64-bit */
#define STEPSIZE 8
#define LZ4_COPYSTEP(s, d) \
do { \
PUT8(s, d); \
d += 8; \
s += 8; \
} while (0)
#define LZ4_COPYPACKET(s, d) LZ4_COPYSTEP(s, d)
#define LZ4_SECURECOPY(s, d, e) \
do { \
if (d < e) { \
LZ4_WILDCOPY(s, d, e); \
} \
} while (0)
#define HTYPE u32
#ifdef __BIG_ENDIAN
#define LZ4_NBCOMMONBYTES(val) (__builtin_clzll(val) >> 3)
#else
#define LZ4_NBCOMMONBYTES(val) (__builtin_ctzll(val) >> 3)
#endif
#else /* 32-bit */
#define STEPSIZE 4
#define LZ4_COPYSTEP(s, d) \
do { \
PUT4(s, d); \
d += 4; \
s += 4; \
} while (0)
#define LZ4_COPYPACKET(s, d) \
do { \
LZ4_COPYSTEP(s, d); \
LZ4_COPYSTEP(s, d); \
} while (0)
#define LZ4_SECURECOPY LZ4_WILDCOPY
#define HTYPE const u8*
#ifdef __BIG_ENDIAN
#define LZ4_NBCOMMONBYTES(val) (__builtin_clz(val) >> 3)
#else
#define LZ4_NBCOMMONBYTES(val) (__builtin_ctz(val) >> 3)
#endif
#endif
#define LZ4_WILDCOPY(s, d, e) \
do { \
LZ4_COPYPACKET(s, d); \
} while (d < e)
#define LZ4_BLINDCOPY(s, d, l) \
do { \
u8 *e = (d) + l; \
LZ4_WILDCOPY(s, d, e); \
d = e; \
} while (0)
|
