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38
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 /*
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24 Attention: This is a stripped down file of SDL_endian for our purposes.
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25 This code is licensed under the LGPL.
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26 This means we must not compile this code into anything that we are not willing to
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27 publicly release source code.
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28 You should compile this into a separate dynamic library that is isolated from proprietary code.
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29 */
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30
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31
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32 #ifndef SDL_endian_minimal_h
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33 #define SDL_endian_minimal_h
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34
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35 #ifdef ANDROID_NDK
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36 #include <endian.h>
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37
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38 #define SDL_BYTEORDER _BYTE_ORDER
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39 #define SDL_BIG_ENDIAN _BIG_ENDIAN
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40 #define SDL_LITTLE_ENDIAN _LITTLE_ENDIAN
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41 #endif
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42
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43 #include <stdint.h>
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44
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45
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46 #if defined(__GNUC__) && defined(__i386__) && \
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47 !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
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48 static __inline__ uint32_t SDL_Swap32(uint32_t x)
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49 {
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50 __asm__("bswap %0" : "=r" (x) : "0" (x));
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51 return x;
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52 }
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53 #elif defined(__GNUC__) && defined(__x86_64__)
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54 static __inline__ uint32_t SDL_Swap32(uint32_t x)
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55 {
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56 __asm__("bswapl %0" : "=r" (x) : "0" (x));
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57 return x;
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58 }
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59 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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60 static __inline__ uint32_t SDL_Swap32(uint32_t x)
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61 {
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62 uint32_t result;
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63
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64 __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
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65 __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
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66 __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
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67 return result;
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68 }
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69 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
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70 static __inline__ uint32_t SDL_Swap32(uint32_t x)
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71 {
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72 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) : "0" (x) : "cc");
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73 return x;
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74 }
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75 #else
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76 static __inline__ uint32_t SDL_Swap32(uint32_t x) {
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77 return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
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78 }
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79 #endif
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80
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81
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82 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
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83 #define SDL_SwapLE16(X) SDL_Swap16(X)
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84 #define SDL_SwapLE32(X) SDL_Swap32(X)
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85 #define SDL_SwapLE64(X) SDL_Swap64(X)
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86 #define SDL_SwapBE16(X) (X)
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87 #define SDL_SwapBE32(X) (X)
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88 #define SDL_SwapBE64(X) (X)
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89 #else
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90 #define SDL_SwapLE16(X) (X)
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91 #define SDL_SwapLE32(X) (X)
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92 #define SDL_SwapLE64(X) (X)
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93 #define SDL_SwapBE16(X) SDL_Swap16(X)
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94 #define SDL_SwapBE32(X) SDL_Swap32(X)
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95 #define SDL_SwapBE64(X) SDL_Swap64(X)
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96 #endif
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97
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98
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99 #endif // SDL_endian_minimal_h
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