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annotate include/SDL_endian.h @ 866:0a45995a7fc3

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Date: Tue, 2 Mar 2004 11:34:54 +0100 From: Bartosz Fenski aka fEnIo Subject: outdated entry in INSTALL file I've just found in INSTALL file: If you are cross-compiling from Linux to Win32, you should read the file README.Win32 But you don't shipped this file with SDL. I've found in CVS logs that this file has been deleted and this information is now in FAQ.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 02 Mar 2004 13:01:02 +0000
parents 6b28c91bf3d2
children cec525374267
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 #else
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83 static __inline__ Uint16 SDL_Swap16(Uint16 x) {
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84 return((x<<8)|(x>>8));
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85 }
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86 #endif
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87
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88 #if defined(__GNUC__) && defined(__i386__)
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89 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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90 {
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91 __asm__("bswap %0" : "=r" (x) : "0" (x));
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92 return x;
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93 }
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94 #elif defined(__GNUC__) && defined(__x86_64__)
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95 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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96 {
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97 __asm__("bswapl %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(__powerpc__) || defined(__ppc__))
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101 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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102 {
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103 Uint32 result;
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104
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105 __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
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106 __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
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107 __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
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108 return result;
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109 }
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110 #else
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111 static __inline__ Uint32 SDL_Swap32(Uint32 x) {
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112 return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
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113 }
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114 #endif
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115
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116 #ifdef SDL_HAS_64BIT_TYPE
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117 #if defined(__GNUC__) && defined(__i386__)
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118 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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119 {
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120 union {
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121 struct { Uint32 a,b; } s;
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122 Uint64 u;
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123 } v;
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124 v.u = x;
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125 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
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126 : "=r" (v.s.a), "=r" (v.s.b)
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127 : "0" (v.s.a), "1" (v.s.b));
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128 return v.u;
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129 }
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130 #elif defined(__GNUC__) && defined(__x86_64__)
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131 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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132 {
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133 __asm__("bswapq %0" : "=r" (x) : "0" (x));
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134 return x;
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135 }
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136 #else
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137 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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138 {
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139 Uint32 hi, lo;
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140
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141 /* Separate into high and low 32-bit values and swap them */
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142 lo = (Uint32)(x&0xFFFFFFFF);
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143 x >>= 32;
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144 hi = (Uint32)(x&0xFFFFFFFF);
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145 x = SDL_Swap32(lo);
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146 x <<= 32;
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147 x |= SDL_Swap32(hi);
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148 return(x);
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149 }
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150 #endif
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151 #else
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152 /* This is mainly to keep compilers from complaining in SDL code.
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153 If there is no real 64-bit datatype, then compilers will complain about
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154 the fake 64-bit datatype that SDL provides when it compiles user code.
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155 */
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156 #define SDL_Swap64(X) (X)
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157 #endif /* SDL_HAS_64BIT_TYPE */
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158
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159
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160 /* Byteswap item from the specified endianness to the native endianness */
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161 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
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162 #define SDL_SwapLE16(X) (X)
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163 #define SDL_SwapLE32(X) (X)
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164 #define SDL_SwapLE64(X) (X)
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165 #define SDL_SwapBE16(X) SDL_Swap16(X)
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166 #define SDL_SwapBE32(X) SDL_Swap32(X)
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167 #define SDL_SwapBE64(X) SDL_Swap64(X)
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168 #else
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169 #define SDL_SwapLE16(X) SDL_Swap16(X)
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170 #define SDL_SwapLE32(X) SDL_Swap32(X)
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171 #define SDL_SwapLE64(X) SDL_Swap64(X)
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172 #define SDL_SwapBE16(X) (X)
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173 #define SDL_SwapBE32(X) (X)
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174 #define SDL_SwapBE64(X) (X)
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175 #endif
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176
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177 /* Read an item of the specified endianness and return in native format */
337
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178 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops *src);
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179 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops *src);
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180 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops *src);
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181 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops *src);
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182 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops *src);
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183 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops *src);
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184
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185 /* Write an item of native format to the specified endianness */
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186 extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops *dst, Uint16 value);
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187 extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops *dst, Uint16 value);
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188 extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops *dst, Uint32 value);
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189 extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops *dst, Uint32 value);
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190 extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops *dst, Uint64 value);
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191 extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops *dst, Uint64 value);
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192
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193
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194 /* Ends C function definitions when using C++ */
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195 #ifdef __cplusplus
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196 }
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197 #endif
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198 #include "close_code.h"
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199
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200 #endif /* _SDL_endian_h */