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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2005 The ScummVM project
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Header$
*
*/
#ifndef COMMON_ENDIAN_H
#define COMMON_ENDIAN_H
#include "common/scummsys.h"
//
// Endian conversion functions, macros etc., follow from here!
//
FORCEINLINE uint32 SWAP_BYTES_32(uint32 a) {
return ((a >> 24) & 0x000000FF) |
((a >> 8) & 0x0000FF00) |
((a << 8) & 0x00FF0000) |
((a << 24) & 0xFF000000);
}
FORCEINLINE uint16 SWAP_BYTES_16(uint16 a) {
return ((a >> 8) & 0x00FF) + ((a << 8) & 0xFF00);
}
#if defined(SCUMM_LITTLE_ENDIAN)
#define PROTO_MKID(a) ((uint32) \
(((a) >> 24) & 0x000000FF) | \
(((a) >> 8) & 0x0000FF00) | \
(((a) << 8) & 0x00FF0000) | \
(((a) << 24) & 0xFF000000))
#define PROTO_MKID_BE(a) ((uint32)(a))
#if defined(INVERSE_MKID)
# define MKID(a) PROTO_MKID_BE(a)
# define MKID_BE(a) PROTO_MKID(a)
#else
# define MKID(a) PROTO_MKID(a)
# define MKID_BE(a) PROTO_MKID_BE(a)
#endif
#define READ_UINT16(a) READ_LE_UINT16(a)
#define READ_UINT32(a) READ_LE_UINT32(a)
#define WRITE_UINT16(a, v) WRITE_LE_UINT16(a, v)
#define WRITE_UINT32(a, v) WRITE_LE_UINT32(a, v)
#define FROM_LE_32(a) ((uint32)(a))
#define FROM_LE_16(a) ((uint16)(a))
#define TO_LE_32(a) ((uint32)(a))
#define TO_LE_16(a) ((uint16)(a))
#define TO_BE_32(a) SWAP_BYTES_32(a)
#define TO_BE_16(a) SWAP_BYTES_16(a)
#elif defined(SCUMM_BIG_ENDIAN)
#define MKID(a) ((uint32)(a))
#define MKID_BE(a) ((uint32)(a))
//#define MKID_BE(a) SWAP_BYTES_32(a)
#define READ_UINT16(a) READ_BE_UINT16(a)
#define READ_UINT32(a) READ_BE_UINT32(a)
#define WRITE_UINT16(a, v) WRITE_BE_UINT16(a, v)
#define WRITE_UINT32(a, v) WRITE_BE_UINT32(a, v)
#define FROM_LE_32(a) SWAP_BYTES_32(a)
#define FROM_LE_16(a) SWAP_BYTES_16(a)
#define TO_LE_32(a) SWAP_BYTES_32(a)
#define TO_LE_16(a) SWAP_BYTES_16(a)
#define TO_BE_32(a) ((uint32)(a))
#define TO_BE_16(a) ((uint16)(a))
#else
#error No endianness defined
#endif
#if defined(SCUMM_NEED_ALIGNMENT) || defined(SCUMM_BIG_ENDIAN)
FORCEINLINE uint16 READ_LE_UINT16(const void *ptr) {
const byte *b = (const byte *)ptr;
return (b[1] << 8) + b[0];
}
FORCEINLINE uint32 READ_LE_UINT32(const void *ptr) {
const byte *b = (const byte *)ptr;
return (b[3] << 24) + (b[2] << 16) + (b[1] << 8) + (b[0]);
}
FORCEINLINE void WRITE_LE_UINT16(void *ptr, uint16 value) {
byte *b = (byte *)ptr;
b[0] = (byte)(value >> 0);
b[1] = (byte)(value >> 8);
}
FORCEINLINE void WRITE_LE_UINT32(void *ptr, uint32 value) {
byte *b = (byte *)ptr;
b[0] = (byte)(value >> 0);
b[1] = (byte)(value >> 8);
b[2] = (byte)(value >> 16);
b[3] = (byte)(value >> 24);
}
#else
FORCEINLINE uint16 READ_LE_UINT16(const void *ptr) {
return *(const uint16 *)(ptr);
}
FORCEINLINE uint32 READ_LE_UINT32(const void *ptr) {
return *(const uint32 *)(ptr);
}
FORCEINLINE void WRITE_LE_UINT16(void *ptr, uint16 value) {
*(uint16 *)(ptr) = value;
}
FORCEINLINE void WRITE_LE_UINT32(void *ptr, uint32 value) {
*(uint32 *)(ptr) = value;
}
#endif
#if defined(SCUMM_NEED_ALIGNMENT) || defined(SCUMM_LITTLE_ENDIAN)
FORCEINLINE uint16 READ_BE_UINT16(const void *ptr) {
const byte *b = (const byte *)ptr;
return (b[0] << 8) + b[1];
}
FORCEINLINE uint32 READ_BE_UINT32(const void *ptr) {
const byte *b = (const byte*)ptr;
return (b[0] << 24) + (b[1] << 16) + (b[2] << 8) + (b[3]);
}
FORCEINLINE void WRITE_BE_UINT16(void *ptr, uint16 value) {
byte *b = (byte *)ptr;
b[0] = (byte)(value >> 8);
b[1] = (byte)(value >> 0);
}
FORCEINLINE void WRITE_BE_UINT32(void *ptr, uint32 value) {
byte *b = (byte *)ptr;
b[0] = (byte)(value >> 24);
b[1] = (byte)(value >> 16);
b[2] = (byte)(value >> 8);
b[3] = (byte)(value >> 0);
}
#else
FORCEINLINE uint16 READ_BE_UINT16(const void *ptr) {
return *(const uint16 *)(ptr);
}
FORCEINLINE uint32 READ_BE_UINT32(const void *ptr) {
return *(const uint32 *)(ptr);
}
FORCEINLINE void WRITE_BE_UINT16(void *ptr, uint16 value) {
*(uint16 *)(ptr) = value;
}
FORCEINLINE void WRITE_BE_UINT32(void *ptr, uint32 value) {
*(uint32 *)(ptr) = value;
}
#endif
FORCEINLINE uint32 READ_LE_UINT24(const void *ptr) {
const byte *b = (const byte *)ptr;
return (b[2] << 16) + (b[1] << 8) + (b[0]);
}
FORCEINLINE uint32 READ_BE_UINT24(const void *ptr) {
const byte *b = (const byte*)ptr;
return (b[0] << 16) + (b[1] << 8) + (b[2]);
}
#endif
|
