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annotate include/SDL_endian.h @ 1015:9454950842ae

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*** empty log message ***
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Dec 2004 05:29:55 +0000
parents c4e5473672b6
children 0f3aa6ab3341
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Functions for reading and writing endian-specific values */
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29
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30 #ifndef _SDL_endian_h
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31 #define _SDL_endian_h
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32
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33 /* These functions read and write data of the specified endianness,
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34 dynamically translating to the host machine endianness.
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35
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36 e.g.: If you want to read a 16 bit value on big-endian machine from
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37 an open file containing little endian values, you would use:
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38 value = SDL_ReadLE16(rp);
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39 Note that the read/write functions use SDL_RWops pointers
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40 instead of FILE pointers. This allows you to read and write
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41 endian values from large chunks of memory as well as files
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42 and other data sources.
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43 */
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44
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45 #include <stdio.h>
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46
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47 #include "SDL_types.h"
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48 #include "SDL_rwops.h"
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49 #include "SDL_byteorder.h"
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50
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51 #include "begin_code.h"
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52 /* Set up for C function definitions, even when using C++ */
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53 #ifdef __cplusplus
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54 extern "C" {
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55 #endif
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56
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57 /* Use inline functions for compilers that support them, and static
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58 functions for those that do not. Because these functions become
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59 static for compilers that do not support inline functions, this
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60 header should only be included in files that actually use them.
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61 */
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62 #if defined(__GNUC__) && defined(__i386__)
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63 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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64 {
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65 __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
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66 return x;
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67 }
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68 #elif defined(__GNUC__) && defined(__x86_64__)
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69 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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70 {
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71 __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
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72 return x;
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73 }
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74 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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75 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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76 {
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77 Uint16 result;
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78
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79 __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
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80 return result;
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81 }
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82 #elif defined(__GNUC__) && defined(__M68000__)
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83 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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84 {
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85 __asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc");
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86 return x;
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87 }
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88 #else
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89 static __inline__ Uint16 SDL_Swap16(Uint16 x) {
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90 return((x<<8)|(x>>8));
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91 }
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92 #endif
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93
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94 #if defined(__GNUC__) && defined(__i386__)
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95 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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96 {
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97 __asm__("bswap %0" : "=r" (x) : "0" (x));
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98 return x;
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99 }
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100 #elif defined(__GNUC__) && defined(__x86_64__)
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101 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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102 {
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103 __asm__("bswapl %0" : "=r" (x) : "0" (x));
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104 return x;
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105 }
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106 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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107 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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108 {
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109 Uint32 result;
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110
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111 __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
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112 __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
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113 __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
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114 return result;
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115 }
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116 #elif defined(__GNUC__) && defined(__M68000__)
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117 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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118 {
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119 __asm__("rorw #8,%0\n\tswap %0\n\tror #8,%0" : "=d" (x) : "0" (x) : "cc");
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120 return x;
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121 }
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122 #else
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123 static __inline__ Uint32 SDL_Swap32(Uint32 x) {
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124 return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
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125 }
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126 #endif
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127
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128 #ifdef SDL_HAS_64BIT_TYPE
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129 #if defined(__GNUC__) && defined(__i386__)
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130 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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131 {
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132 union {
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133 struct { Uint32 a,b; } s;
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134 Uint64 u;
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135 } v;
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136 v.u = x;
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137 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
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138 : "=r" (v.s.a), "=r" (v.s.b)
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139 : "0" (v.s.a), "1" (v.s.b));
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140 return v.u;
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141 }
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142 #elif defined(__GNUC__) && defined(__x86_64__)
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143 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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144 {
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145 __asm__("bswapq %0" : "=r" (x) : "0" (x));
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146 return x;
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147 }
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148 #else
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149 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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150 {
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151 Uint32 hi, lo;
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152
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153 /* Separate into high and low 32-bit values and swap them */
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154 lo = (Uint32)(x&0xFFFFFFFF);
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155 x >>= 32;
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156 hi = (Uint32)(x&0xFFFFFFFF);
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157 x = SDL_Swap32(lo);
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158 x <<= 32;
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159 x |= SDL_Swap32(hi);
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160 return(x);
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161 }
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162 #endif
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163 #else
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164 /* This is mainly to keep compilers from complaining in SDL code.
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165 If there is no real 64-bit datatype, then compilers will complain about
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166 the fake 64-bit datatype that SDL provides when it compiles user code.
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167 */
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168 #define SDL_Swap64(X) (X)
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169 #endif /* SDL_HAS_64BIT_TYPE */
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170
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171
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172 /* Byteswap item from the specified endianness to the native endianness */
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173 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
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174 #define SDL_SwapLE16(X) (X)
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175 #define SDL_SwapLE32(X) (X)
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176 #define SDL_SwapLE64(X) (X)
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177 #define SDL_SwapBE16(X) SDL_Swap16(X)
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178 #define SDL_SwapBE32(X) SDL_Swap32(X)
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179 #define SDL_SwapBE64(X) SDL_Swap64(X)
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180 #else
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181 #define SDL_SwapLE16(X) SDL_Swap16(X)
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182 #define SDL_SwapLE32(X) SDL_Swap32(X)
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183 #define SDL_SwapLE64(X) SDL_Swap64(X)
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184 #define SDL_SwapBE16(X) (X)
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185 #define SDL_SwapBE32(X) (X)
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186 #define SDL_SwapBE64(X) (X)
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187 #endif
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188
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189 /* Read an item of the specified endianness and return in native format */
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190 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops *src);
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191 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops *src);
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192 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops *src);
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193 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops *src);
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194 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops *src);
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195 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops *src);
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196
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197 /* Write an item of native format to the specified endianness */
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198 extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops *dst, Uint16 value);
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199 extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops *dst, Uint16 value);
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200 extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops *dst, Uint32 value);
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201 extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops *dst, Uint32 value);
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202 extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops *dst, Uint64 value);
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203 extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops *dst, Uint64 value);
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204
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205
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206 /* Ends C function definitions when using C++ */
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207 #ifdef __cplusplus
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208 }
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209 #endif
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210 #include "close_code.h"
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211
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212 #endif /* _SDL_endian_h */