annotate include/SDL_endian.h @ 1348:40d0975c1769

Date: Mon, 6 Feb 2006 11:41:04 -0500 From: "mystml@adinet.com.uy" Subject: [SDL] ALT-F4 using DirectX My game isn't getting SDL_QUIT when I press ALT-F4 using the DirectX driver; it does get SDL_QUIT when I press the red X in the window. I tracked this down to DX5_HandleMessage() in SDL_dx5events.c; WM_SYSKEYDOWN is being trapped and ignored which causes Windows not to post a WM_CLOSE, hence no SDL_QUIT is being generated. The relevant code is this : /* The keyboard is handled via DirectInput */ case WM_SYSKEYUP: case WM_SYSKEYDOWN: case WM_KEYUP: case WM_KEYDOWN: { /* Ignore windows keyboard messages */; } return(0); If I comment the WM_SYSKEYDOWN case, it falls through DefWindowProc() and ALT-F4 starts working again. I'm not sure about the best way to fix this. One option is handling ALT-F4 as a particular case somehow, but doesn't sound good. Another option would be to handle WM_SYSKEYDOWN separately and breaking instead of returning 0, so processing falls through and goes to DefWindowProc which does The Right Thing (TM). This seems to be the minimal change that makes ALT-F4 work and normal keyboard input continues to work. Does this sound reasonable? Am I overlooking anything? Do I submit a patch? --Gabriel
author Sam Lantinga <slouken@libsdl.org>
date Wed, 08 Feb 2006 17:19:43 +0000
parents 450721ad5436
children 7ba544e2888d
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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 {
0
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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);
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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 */