OpenTTD Source: src/core/endian_func.hpp Source File

OpenTTD Source 12.0-beta1

endian_func.hpp
Go to the documentation of this file.
1 /*
2 * This file is part of OpenTTD.
3 * OpenTTD 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, version 2.
4 * OpenTTD 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.
5 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
6 */
7
10 #ifndef ENDIAN_FUNC_HPP
11 #define ENDIAN_FUNC_HPP
12
13 #include "endian_type.hpp"
14 #include "bitmath_func.hpp"
15
16 /* Setup alignment and conversion macros */
17 #if TTD_ENDIAN == TTD_BIG_ENDIAN
18 # define FROM_BE16(x) (x)
19 # define FROM_BE32(x) (x)
20 # define TO_BE16(x) (x)
21 # define TO_BE32(x) (x)
22 # define TO_BE32X(x) (x)
23 # define FROM_LE16(x) BSWAP16(x)
24 # define FROM_LE32(x) BSWAP32(x)
25 # define TO_LE16(x) BSWAP16(x)
26 # define TO_LE32(x) BSWAP32(x)
27 # define TO_LE32X(x) BSWAP32(x)
28 #else
29 # define FROM_BE16(x) BSWAP16(x)
30 # define FROM_BE32(x) BSWAP32(x)
31 # define TO_BE16(x) BSWAP16(x)
32 # define TO_BE32(x) BSWAP32(x)
33 # define TO_BE32X(x) BSWAP32(x)
34 # define FROM_LE16(x) (x)
35 # define FROM_LE32(x) (x)
36 # define TO_LE16(x) (x)
37 # define TO_LE32(x) (x)
38 # define TO_LE32X(x) (x)
39 #endif /* TTD_ENDIAN == TTD_BIG_ENDIAN */
40
41 static inline uint16 ReadLE16Aligned(const void *x)
42 {
43 return FROM_LE16(*(const uint16*)x);
44 }
45
46 static inline uint16 ReadLE16Unaligned(const void *x)
47 {
48 #if OTTD_ALIGNMENT == 1
49 return ((const byte*)x)[0] | ((const byte*)x)[1] << 8;
50 #else
51 return FROM_LE16(*(const uint16*)x);
52 #endif /* OTTD_ALIGNMENT == 1 */
53 }
54
55 #endif /* ENDIAN_FUNC_HPP */
bitmath_func.hpp
endian_type.hpp