2 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
3 SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
4 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
5 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
6 IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
7 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
8 FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
9 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
10 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
11 COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
16 * code to swap bytes because of big/little endian problems.
17 * contains the macros:
18 * SWAP{INT,SHORT}(x): returns a swapped version of x
19 * INTEL_{INT,SHORT}(x): returns x after conversion to/from little endian
20 * GET_INTEL_{INT,SHORT}(src): gets value from little-endian buffer src
21 * PUT_INTEL_{INT,SHORT}(dest, src): puts src into little-endian buffer dest
23 * the GET/PUT macros are safe to use on platforms which segfault on unaligned word access
32 #define SWAPSHORT(x) (((ubyte)(x) << 8) | (((ushort)(x)) >> 8))
33 #define SWAPINT(x) (((x)<<24) | (((uint)(x)) >> 24) | (((x) &0x0000ff00) << 8) | (((x) & 0x00ff0000) >> 8))
35 #ifndef WORDS_BIGENDIAN
36 #define INTEL_INT(x) x
37 #define INTEL_SHORT(x) x
38 #else // ! WORDS_BIGENDIAN
39 #define INTEL_INT(x) SWAPINT(x)
40 #define INTEL_SHORT(x) SWAPSHORT(x)
41 #endif // ! WORDS_BIGENDIAN
43 #ifndef WORDS_NEED_ALIGNMENT
44 #define GET_INTEL_INT(s) INTEL_INT(*(uint *)(s))
45 #define GET_INTEL_SHORT(s) INTEL_SHORT(*(ushort *)(s))
46 #define PUT_INTEL_INT(d, s) { *(uint *)(d) = INTEL_INT((uint)(s)); }
47 #define PUT_INTEL_SHORT(d, s) { *(ushort *)(d) = INTEL_SHORT((ushort)(s)); }
48 #else // ! WORDS_NEED_ALIGNMENT
49 static inline uint GET_INTEL_INT(void *s)
52 memcpy((void *)&tmp, s, 4);
53 return INTEL_INT(tmp);
55 static inline uint GET_INTEL_SHORT(void *s)
58 memcpy((void *)&tmp, s, 2);
59 return INTEL_SHORT(tmp);
61 #define PUT_INTEL_INT(d, s) { uint tmp = INTEL_INT(s); \
62 memcpy((void *)(d), (void *)&tmp, 4); }
63 #define PUT_INTEL_SHORT(d, s) { ushort tmp = INTEL_SHORT(s); \
64 memcpy((void *)(d), (void *)&tmp, 2); }
65 #endif // ! WORDS_NEED_ALIGNMENT
67 #endif // ! _BYTESWAP_H