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annotate include/SDL_endian.h @ 1336:3692456e7b0f

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Use SDL_ prefixed versions of C library functions. FIXME: Change #include <stdlib.h> to #include "SDL_stdlib.h" Change #include <string.h> to #include "SDL_string.h" Make sure nothing else broke because of this...
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 06:59:48 +0000
parents 450721ad5436
children 7ba544e2888d
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 /* Functions for reading and writing endian-specific values */
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24
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25 #ifndef _SDL_endian_h
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26 #define _SDL_endian_h
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27
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28 /* These functions read and write data of the specified endianness,
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29 dynamically translating to the host machine endianness.
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30
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31 e.g.: If you want to read a 16 bit value on big-endian machine from
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32 an open file containing little endian values, you would use:
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33 value = SDL_ReadLE16(rp);
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34 Note that the read/write functions use SDL_RWops pointers
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35 instead of FILE pointers. This allows you to read and write
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36 endian values from large chunks of memory as well as files
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37 and other data sources.
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38 */
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39
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40 #include "SDL_types.h"
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41 #include "SDL_rwops.h"
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42 #include "SDL_byteorder.h"
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43
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44 #include "begin_code.h"
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45 /* Set up for C function definitions, even when using C++ */
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46 #ifdef __cplusplus
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47 extern "C" {
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48 #endif
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49
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50 /* Use inline functions for compilers that support them, and static
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51 functions for those that do not. Because these functions become
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52 static for compilers that do not support inline functions, this
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53 header should only be included in files that actually use them.
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54 */
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55 #if defined(__GNUC__) && defined(__i386__)
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56 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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57 {
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58 __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
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59 return x;
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60 }
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61 #elif defined(__GNUC__) && defined(__x86_64__)
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62 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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63 {
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64 __asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x));
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65 return x;
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66 }
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67 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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68 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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69 {
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70 Uint16 result;
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71
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72 __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
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73 return result;
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74 }
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75 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
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76 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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77 {
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78 __asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc");
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79 return x;
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80 }
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81 #else
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82 static __inline__ Uint16 SDL_Swap16(Uint16 x) {
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83 return((x<<8)|(x>>8));
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84 }
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85 #endif
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86
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87 #if defined(__GNUC__) && defined(__i386__)
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88 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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89 {
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90 __asm__("bswap %0" : "=r" (x) : "0" (x));
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91 return x;
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92 }
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93 #elif defined(__GNUC__) && defined(__x86_64__)
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94 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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95 {
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96 __asm__("bswapl %0" : "=r" (x) : "0" (x));
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97 return x;
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98 }
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99 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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100 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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101 {
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102 Uint32 result;
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103
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104 __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
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105 __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
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106 __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
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107 return result;
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108 }
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109 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
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110 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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111 {
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112 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) : "0" (x) : "cc");
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113 return x;
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114 }
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115 #else
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116 static __inline__ Uint32 SDL_Swap32(Uint32 x) {
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117 return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
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118 }
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119 #endif
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120
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121 #ifdef SDL_HAS_64BIT_TYPE
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122 #if defined(__GNUC__) && defined(__i386__)
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123 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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124 {
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125 union {
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126 struct { Uint32 a,b; } s;
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127 Uint64 u;
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128 } v;
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129 v.u = x;
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130 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
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131 : "=r" (v.s.a), "=r" (v.s.b)
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132 : "0" (v.s.a), "1" (v.s.b));
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133 return v.u;
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134 }
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135 #elif defined(__GNUC__) && defined(__x86_64__)
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136 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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137 {
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138 __asm__("bswapq %0" : "=r" (x) : "0" (x));
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139 return x;
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140 }
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141 #else
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142 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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143 {
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144 Uint32 hi, lo;
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145
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146 /* Separate into high and low 32-bit values and swap them */
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147 lo = (Uint32)(x&0xFFFFFFFF);
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148 x >>= 32;
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149 hi = (Uint32)(x&0xFFFFFFFF);
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150 x = SDL_Swap32(lo);
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151 x <<= 32;
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152 x |= SDL_Swap32(hi);
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153 return(x);
0
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154 }
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155 #endif
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156 #else
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157 /* This is mainly to keep compilers from complaining in SDL code.
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158 If there is no real 64-bit datatype, then compilers will complain about
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159 the fake 64-bit datatype that SDL provides when it compiles user code.
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160 */
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161 #define SDL_Swap64(X) (X)
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162 #endif /* SDL_HAS_64BIT_TYPE */
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163
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164
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165 /* Byteswap item from the specified endianness to the native endianness */
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166 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
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167 #define SDL_SwapLE16(X) (X)
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168 #define SDL_SwapLE32(X) (X)
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169 #define SDL_SwapLE64(X) (X)
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170 #define SDL_SwapBE16(X) SDL_Swap16(X)
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171 #define SDL_SwapBE32(X) SDL_Swap32(X)
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172 #define SDL_SwapBE64(X) SDL_Swap64(X)
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173 #else
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174 #define SDL_SwapLE16(X) SDL_Swap16(X)
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175 #define SDL_SwapLE32(X) SDL_Swap32(X)
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176 #define SDL_SwapLE64(X) SDL_Swap64(X)
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177 #define SDL_SwapBE16(X) (X)
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178 #define SDL_SwapBE32(X) (X)
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179 #define SDL_SwapBE64(X) (X)
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180 #endif
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181
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182 /* Read an item of the specified endianness and return in native format */
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183 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops *src);
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184 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops *src);
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185 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops *src);
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186 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops *src);
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187 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops *src);
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188 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops *src);
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189
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190 /* Write an item of native format to the specified endianness */
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191 extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops *dst, Uint16 value);
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192 extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops *dst, Uint16 value);
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193 extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops *dst, Uint32 value);
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194 extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops *dst, Uint32 value);
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195 extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops *dst, Uint64 value);
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196 extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops *dst, Uint64 value);
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197
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198
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199 /* Ends C function definitions when using C++ */
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200 #ifdef __cplusplus
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201 }
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202 #endif
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203 #include "close_code.h"
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204
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205 #endif /* _SDL_endian_h */