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
|
/**
* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of https://github.com/facebook/zstd.
*
* 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. This program is dual-licensed; you may select
* either version 2 of the GNU General Public License ("GPL") or BSD license
* ("BSD").
*/
#ifndef MEM_H_MODULE
#define MEM_H_MODULE
/*-****************************************
* Dependencies
******************************************/
#include <asm/unaligned.h>
#include <linux/string.h> /* memcpy */
#include <linux/types.h> /* size_t, ptrdiff_t */
/*-****************************************
* Compiler specifics
******************************************/
#define ZSTD_STATIC static __inline __attribute__((unused))
/*-**************************************************************
* Basic Types
*****************************************************************/
typedef uint8_t BYTE;
typedef uint16_t U16;
typedef int16_t S16;
typedef uint32_t U32;
typedef int32_t S32;
typedef uint64_t U64;
typedef int64_t S64;
typedef ptrdiff_t iPtrDiff;
typedef uintptr_t uPtrDiff;
/*-**************************************************************
* Memory I/O
*****************************************************************/
ZSTD_STATIC unsigned ZSTD_32bits(void) { return sizeof(size_t) == 4; }
ZSTD_STATIC unsigned ZSTD_64bits(void) { return sizeof(size_t) == 8; }
#if defined(__LITTLE_ENDIAN)
#define ZSTD_LITTLE_ENDIAN 1
#else
#define ZSTD_LITTLE_ENDIAN 0
#endif
ZSTD_STATIC unsigned ZSTD_isLittleEndian(void) { return ZSTD_LITTLE_ENDIAN; }
ZSTD_STATIC U16 ZSTD_read16(const void *memPtr) { return get_unaligned((const U16 *)memPtr); }
ZSTD_STATIC U32 ZSTD_read32(const void *memPtr) { return get_unaligned((const U32 *)memPtr); }
ZSTD_STATIC U64 ZSTD_read64(const void *memPtr) { return get_unaligned((const U64 *)memPtr); }
ZSTD_STATIC size_t ZSTD_readST(const void *memPtr) { return get_unaligned((const size_t *)memPtr); }
ZSTD_STATIC void ZSTD_write16(void *memPtr, U16 value) { put_unaligned(value, (U16 *)memPtr); }
ZSTD_STATIC void ZSTD_write32(void *memPtr, U32 value) { put_unaligned(value, (U32 *)memPtr); }
ZSTD_STATIC void ZSTD_write64(void *memPtr, U64 value) { put_unaligned(value, (U64 *)memPtr); }
/*=== Little endian r/w ===*/
ZSTD_STATIC U16 ZSTD_readLE16(const void *memPtr) { return get_unaligned_le16(memPtr); }
ZSTD_STATIC void ZSTD_writeLE16(void *memPtr, U16 val) { put_unaligned_le16(val, memPtr); }
ZSTD_STATIC U32 ZSTD_readLE24(const void *memPtr) { return ZSTD_readLE16(memPtr) + (((const BYTE *)memPtr)[2] << 16); }
ZSTD_STATIC void ZSTD_writeLE24(void *memPtr, U32 val)
{
ZSTD_writeLE16(memPtr, (U16)val);
((BYTE *)memPtr)[2] = (BYTE)(val >> 16);
}
ZSTD_STATIC U32 ZSTD_readLE32(const void *memPtr) { return get_unaligned_le32(memPtr); }
ZSTD_STATIC void ZSTD_writeLE32(void *memPtr, U32 val32) { put_unaligned_le32(val32, memPtr); }
ZSTD_STATIC U64 ZSTD_readLE64(const void *memPtr) { return get_unaligned_le64(memPtr); }
ZSTD_STATIC void ZSTD_writeLE64(void *memPtr, U64 val64) { put_unaligned_le64(val64, memPtr); }
ZSTD_STATIC size_t ZSTD_readLEST(const void *memPtr)
{
if (ZSTD_32bits())
return (size_t)ZSTD_readLE32(memPtr);
else
return (size_t)ZSTD_readLE64(memPtr);
}
ZSTD_STATIC void ZSTD_writeLEST(void *memPtr, size_t val)
{
if (ZSTD_32bits())
ZSTD_writeLE32(memPtr, (U32)val);
else
ZSTD_writeLE64(memPtr, (U64)val);
}
/*=== Big endian r/w ===*/
ZSTD_STATIC U32 ZSTD_readBE32(const void *memPtr) { return get_unaligned_be32(memPtr); }
ZSTD_STATIC void ZSTD_writeBE32(void *memPtr, U32 val32) { put_unaligned_be32(val32, memPtr); }
ZSTD_STATIC U64 ZSTD_readBE64(const void *memPtr) { return get_unaligned_be64(memPtr); }
ZSTD_STATIC void ZSTD_writeBE64(void *memPtr, U64 val64) { put_unaligned_be64(val64, memPtr); }
ZSTD_STATIC size_t ZSTD_readBEST(const void *memPtr)
{
if (ZSTD_32bits())
return (size_t)ZSTD_readBE32(memPtr);
else
return (size_t)ZSTD_readBE64(memPtr);
}
ZSTD_STATIC void ZSTD_writeBEST(void *memPtr, size_t val)
{
if (ZSTD_32bits())
ZSTD_writeBE32(memPtr, (U32)val);
else
ZSTD_writeBE64(memPtr, (U64)val);
}
/* function safe only for comparisons */
ZSTD_STATIC U32 ZSTD_readMINMATCH(const void *memPtr, U32 length)
{
switch (length) {
default:
case 4: return ZSTD_read32(memPtr);
case 3:
if (ZSTD_isLittleEndian())
return ZSTD_read32(memPtr) << 8;
else
return ZSTD_read32(memPtr) >> 8;
}
}
#endif /* MEM_H_MODULE */
|
