![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to sdl_endian.h CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Synchronet] / sbbs / include / sdl|
Return to sdl_endian.h CVS log | Up to [Synchronet] / sbbs / include / sdl |
1.1 root 1: /*
2: SDL - Simple DirectMedia Layer
1.1.1.2 ! root 3: Copyright (C) 1997-2006 Sam Lantinga
1.1 root 4:
5: This library is free software; you can redistribute it and/or
1.1.1.2 ! root 6: modify it under the terms of the GNU Lesser General Public
1.1 root 7: License as published by the Free Software Foundation; either
1.1.1.2 ! root 8: version 2.1 of the License, or (at your option) any later version.
1.1 root 9:
10: This library is distributed in the hope that it will be useful,
11: but WITHOUT ANY WARRANTY; without even the implied warranty of
12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
1.1.1.2 ! root 13: Lesser General Public License for more details.
1.1 root 14:
1.1.1.2 ! root 15: You should have received a copy of the GNU Lesser General Public
! 16: License along with this library; if not, write to the Free Software
! 17: Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1.1 root 18:
19: Sam Lantinga
20: [email protected]
21: */
22:
23: /* Functions for reading and writing endian-specific values */
24:
25: #ifndef _SDL_endian_h
26: #define _SDL_endian_h
27:
1.1.1.2 ! root 28: #include "SDL_stdinc.h"
1.1 root 29:
1.1.1.2 ! root 30: /* The two types of endianness */
! 31: #define SDL_LIL_ENDIAN 1234
! 32: #define SDL_BIG_ENDIAN 4321
! 33:
! 34: #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */
! 35: #if defined(__hppa__) || \
! 36: defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
! 37: (defined(__MIPS__) && defined(__MISPEB__)) || \
! 38: defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
! 39: defined(__sparc__)
! 40: #define SDL_BYTEORDER SDL_BIG_ENDIAN
! 41: #else
! 42: #define SDL_BYTEORDER SDL_LIL_ENDIAN
! 43: #endif
! 44: #endif /* !SDL_BYTEORDER */
1.1 root 45:
46:
47: #include "begin_code.h"
48: /* Set up for C function definitions, even when using C++ */
49: #ifdef __cplusplus
50: extern "C" {
51: #endif
52:
53: /* Use inline functions for compilers that support them, and static
54: functions for those that do not. Because these functions become
55: static for compilers that do not support inline functions, this
56: header should only be included in files that actually use them.
57: */
1.1.1.2 ! root 58: #if defined(__GNUC__) && defined(__i386__) && \
! 59: !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
1.1 root 60: static __inline__ Uint16 SDL_Swap16(Uint16 x)
61: {
62: __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
63: return x;
64: }
65: #elif defined(__GNUC__) && defined(__x86_64__)
66: static __inline__ Uint16 SDL_Swap16(Uint16 x)
67: {
68: __asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x));
69: return x;
70: }
71: #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
72: static __inline__ Uint16 SDL_Swap16(Uint16 x)
73: {
74: Uint16 result;
75:
76: __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
77: return result;
78: }
79: #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
80: static __inline__ Uint16 SDL_Swap16(Uint16 x)
81: {
82: __asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc");
83: return x;
84: }
85: #else
86: static __inline__ Uint16 SDL_Swap16(Uint16 x) {
87: return((x<<8)|(x>>8));
88: }
89: #endif
90:
1.1.1.2 ! root 91: #if defined(__GNUC__) && defined(__i386__) && \
! 92: !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
1.1 root 93: static __inline__ Uint32 SDL_Swap32(Uint32 x)
94: {
95: __asm__("bswap %0" : "=r" (x) : "0" (x));
96: return x;
97: }
98: #elif defined(__GNUC__) && defined(__x86_64__)
99: static __inline__ Uint32 SDL_Swap32(Uint32 x)
100: {
101: __asm__("bswapl %0" : "=r" (x) : "0" (x));
102: return x;
103: }
104: #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
105: static __inline__ Uint32 SDL_Swap32(Uint32 x)
106: {
107: Uint32 result;
108:
109: __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
110: __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
111: __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
112: return result;
113: }
114: #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
115: static __inline__ Uint32 SDL_Swap32(Uint32 x)
116: {
117: __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) : "0" (x) : "cc");
118: return x;
119: }
120: #else
121: static __inline__ Uint32 SDL_Swap32(Uint32 x) {
122: return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
123: }
124: #endif
125:
126: #ifdef SDL_HAS_64BIT_TYPE
1.1.1.2 ! root 127: #if defined(__GNUC__) && defined(__i386__) && \
! 128: !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
1.1 root 129: static __inline__ Uint64 SDL_Swap64(Uint64 x)
130: {
131: union {
132: struct { Uint32 a,b; } s;
133: Uint64 u;
134: } v;
135: v.u = x;
136: __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
137: : "=r" (v.s.a), "=r" (v.s.b)
138: : "0" (v.s.a), "1" (v.s.b));
139: return v.u;
140: }
141: #elif defined(__GNUC__) && defined(__x86_64__)
142: static __inline__ Uint64 SDL_Swap64(Uint64 x)
143: {
144: __asm__("bswapq %0" : "=r" (x) : "0" (x));
145: return x;
146: }
147: #else
148: static __inline__ Uint64 SDL_Swap64(Uint64 x)
149: {
150: Uint32 hi, lo;
151:
152: /* Separate into high and low 32-bit values and swap them */
153: lo = (Uint32)(x&0xFFFFFFFF);
154: x >>= 32;
155: hi = (Uint32)(x&0xFFFFFFFF);
156: x = SDL_Swap32(lo);
157: x <<= 32;
158: x |= SDL_Swap32(hi);
159: return(x);
160: }
161: #endif
162: #else
163: /* This is mainly to keep compilers from complaining in SDL code.
164: If there is no real 64-bit datatype, then compilers will complain about
165: the fake 64-bit datatype that SDL provides when it compiles user code.
166: */
167: #define SDL_Swap64(X) (X)
168: #endif /* SDL_HAS_64BIT_TYPE */
169:
170:
171: /* Byteswap item from the specified endianness to the native endianness */
172: #if SDL_BYTEORDER == SDL_LIL_ENDIAN
173: #define SDL_SwapLE16(X) (X)
174: #define SDL_SwapLE32(X) (X)
175: #define SDL_SwapLE64(X) (X)
176: #define SDL_SwapBE16(X) SDL_Swap16(X)
177: #define SDL_SwapBE32(X) SDL_Swap32(X)
178: #define SDL_SwapBE64(X) SDL_Swap64(X)
179: #else
180: #define SDL_SwapLE16(X) SDL_Swap16(X)
181: #define SDL_SwapLE32(X) SDL_Swap32(X)
182: #define SDL_SwapLE64(X) SDL_Swap64(X)
183: #define SDL_SwapBE16(X) (X)
184: #define SDL_SwapBE32(X) (X)
185: #define SDL_SwapBE64(X) (X)
186: #endif
187:
188: /* Ends C function definitions when using C++ */
189: #ifdef __cplusplus
190: }
191: #endif
192: #include "close_code.h"
193:
194: #endif /* _SDL_endian_h */
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.