5 // Copyright (C) 1999 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This library is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU Library General Public
9 // License as published by the Free Software Foundation; either
10 // version 2 of the License, or (at your option) any later version.
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // Library General Public License for more details.
17 // You should have received a copy of the GNU Library General Public
18 // License along with this library; if not, write to the
19 // Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 // Boston, MA 02111-1307, USA.
25 //////////////////////////////////////////////////////////////////////
27 // There are many sick systems out there:
29 // check for sizeof(float) and sizeof(double)
30 // if sizeof(float) != 4 this code must be patched
31 // if sizeof(double) != 8 this code must be patched
33 // Those are comments I fetched out of glibc source:
34 // - s390 is big-endian
35 // - Sparc is big-endian, but v9 supports endian conversion
36 // on loads/stores and GCC supports such a mode. Be prepared.
37 // - The MIPS architecture has selectable endianness.
38 // - x86_64 is little-endian.
39 // - CRIS is little-endian.
40 // - m68k is big-endian.
41 // - Alpha is little-endian.
42 // - PowerPC can be little or big endian.
43 // - SH is bi-endian but with a big-endian FPU.
44 // - hppa1.1 big-endian.
45 // - ARM is (usually) little-endian but with a big-endian FPU.
47 //////////////////////////////////////////////////////////////////////
51 typedef signed char int8_t;
52 typedef signed short int16_t;
53 typedef signed int int32_t;
54 typedef signed __int64 int64_t;
55 typedef unsigned char uint8_t;
56 typedef unsigned short uint16_t;
57 typedef unsigned int uint32_t;
58 typedef unsigned __int64 uint64_t;
60 # include <sys/types.h>
66 inline uint16_t sg_bswap_16(uint16_t x) {
67 x = (x >> 8) | (x << 8);
71 inline uint32_t sg_bswap_32(uint32_t x) {
72 x = ((x >> 8) & 0x00FF00FFL) | ((x << 8) & 0xFF00FF00L);
73 x = (x >> 16) | (x << 16);
77 inline uint64_t sg_bswap_64(uint64_t x) {
78 x = ((x >> 8) & 0x00FF00FF00FF00FFLL) | ((x << 8) & 0xFF00FF00FF00FF00LL);
79 x = ((x >> 16) & 0x0000FFFF0000FFFFLL) | ((x << 16) & 0xFFFF0000FFFF0000LL);
80 x = (x >> 32) | (x << 32);
85 inline bool sgIsLittleEndian() {
86 static const int sgEndianTest = 1;
87 return (*((char *) &sgEndianTest ) != 0);
90 inline bool sgIsBigEndian() {
91 static const int sgEndianTest = 1;
92 return (*((char *) &sgEndianTest ) == 0);
95 inline void sgEndianSwap(uint16_t *x) { *x = sg_bswap_16(*x); }
96 inline void sgEndianSwap(uint32_t *x) { *x = sg_bswap_32(*x); }
97 inline void sgEndianSwap(uint64_t *x) { *x = sg_bswap_64(*x); }
101 #endif // !_STDINT_HXX