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  1. /**
  2.  * PhysicsFS; a portable, flexible file i/o abstraction.
  3.  *
  4.  * Documentation is in physfs.h. It's verbose, honest.  :)
  5.  *
  6.  * Please see the file LICENSE.txt in the source's root directory.
  7.  *
  8.  *  This file written by Ryan C. Gordon.
  9.  */
  10.  
  11. #define __PHYSICSFS_INTERNAL__
  12. #include "physfs_internal.h"
  13.  
  14. #ifndef PHYSFS_Swap16
  15. static inline PHYSFS_uint16 PHYSFS_Swap16(PHYSFS_uint16 D)
  16. {
  17.     return ((D<<8)|(D>>8));
  18. }
  19. #endif
  20. #ifndef PHYSFS_Swap32
  21. static inline PHYSFS_uint32 PHYSFS_Swap32(PHYSFS_uint32 D)
  22. {
  23.     return ((D<<24)|((D<<8)&0x00FF0000)|((D>>8)&0x0000FF00)|(D>>24));
  24. }
  25. #endif
  26. #ifndef PHYSFS_NO_64BIT_SUPPORT
  27. #ifndef PHYSFS_Swap64
  28. static inline PHYSFS_uint64 PHYSFS_Swap64(PHYSFS_uint64 val) {
  29.     PHYSFS_uint32 hi, lo;
  30.  
  31.     /* Separate into high and low 32-bit values and swap them */
  32.     lo = (PHYSFS_uint32)(val&0xFFFFFFFF);
  33.     val >>= 32;
  34.     hi = (PHYSFS_uint32)(val&0xFFFFFFFF);
  35.     val = PHYSFS_Swap32(lo);
  36.     val <<= 32;
  37.     val |= PHYSFS_Swap32(hi);
  38.     return val;
  39. }
  40. #endif
  41. #else
  42. #ifndef PHYSFS_Swap64
  43. /* This is mainly to keep compilers from complaining in PHYSFS code.
  44.    If there is no real 64-bit datatype, then compilers will complain about
  45.    the fake 64-bit datatype that PHYSFS provides when it compiles user code.
  46. */
  47. #define PHYSFS_Swap64(X)    (X)
  48. #endif
  49. #endif /* PHYSFS_NO_64BIT_SUPPORT */
  50.  
  51.  
  52. /* Byteswap item from the specified endianness to the native endianness */
  53. #if PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN
  54. PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 x) { return x; }
  55. PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 x) { return x; }
  56. PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 x) { return x; }
  57. PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 x) { return x; }
  58. PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 x) { return x; }
  59. PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 x) { return x; }
  60.  
  61. PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 x) { return PHYSFS_Swap16(x); }
  62. PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 x) { return PHYSFS_Swap16(x); }
  63. PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 x) { return PHYSFS_Swap32(x); }
  64. PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 x) { return PHYSFS_Swap32(x); }
  65. PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 x) { return PHYSFS_Swap64(x); }
  66. PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 x) { return PHYSFS_Swap64(x); }
  67. #else
  68. PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 x) { return PHYSFS_Swap16(x); }
  69. PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 x) { return PHYSFS_Swap16(x); }
  70. PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 x) { return PHYSFS_Swap32(x); }
  71. PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 x) { return PHYSFS_Swap32(x); }
  72. PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 x) { return PHYSFS_Swap64(x); }
  73. PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 x) { return PHYSFS_Swap64(x); }
  74.  
  75. PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 x) { return x; }
  76. PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 x) { return x; }
  77. PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 x) { return x; }
  78. PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 x) { return x; }
  79. PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 x) { return x; }
  80. PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 x) { return x; }
  81. #endif
  82.  
  83. static inline int readAll(PHYSFS_File *file, void *val, const size_t len)
  84. {
  85.     return (PHYSFS_readBytes(file, val, len) == len);
  86. } /* readAll */
  87.  
  88. #define PHYSFS_BYTEORDER_READ(datatype, swaptype) \
  89.     int PHYSFS_read##swaptype(PHYSFS_File *file, PHYSFS_##datatype *val) { \
  90.         PHYSFS_##datatype in; \
  91.         BAIL_IF(val == NULL, PHYSFS_ERR_INVALID_ARGUMENT, 0); \
  92.         BAIL_IF_ERRPASS(!readAll(file, &in, sizeof (in)), 0); \
  93.         *val = PHYSFS_swap##swaptype(in); \
  94.         return 1; \
  95.     }
  96.  
  97. PHYSFS_BYTEORDER_READ(sint16, SLE16)
  98. PHYSFS_BYTEORDER_READ(uint16, ULE16)
  99. PHYSFS_BYTEORDER_READ(sint16, SBE16)
  100. PHYSFS_BYTEORDER_READ(uint16, UBE16)
  101. PHYSFS_BYTEORDER_READ(sint32, SLE32)
  102. PHYSFS_BYTEORDER_READ(uint32, ULE32)
  103. PHYSFS_BYTEORDER_READ(sint32, SBE32)
  104. PHYSFS_BYTEORDER_READ(uint32, UBE32)
  105. PHYSFS_BYTEORDER_READ(sint64, SLE64)
  106. PHYSFS_BYTEORDER_READ(uint64, ULE64)
  107. PHYSFS_BYTEORDER_READ(sint64, SBE64)
  108. PHYSFS_BYTEORDER_READ(uint64, UBE64)
  109.  
  110.  
  111. static inline int writeAll(PHYSFS_File *f, const void *val, const size_t len)
  112. {
  113.     return (PHYSFS_writeBytes(f, val, len) == len);
  114. } /* writeAll */
  115.  
  116. #define PHYSFS_BYTEORDER_WRITE(datatype, swaptype) \
  117.     int PHYSFS_write##swaptype(PHYSFS_File *file, PHYSFS_##datatype val) { \
  118.         const PHYSFS_##datatype out = PHYSFS_swap##swaptype(val); \
  119.         BAIL_IF_ERRPASS(!writeAll(file, &out, sizeof (out)), 0); \
  120.         return 1; \
  121.     }
  122.  
  123. PHYSFS_BYTEORDER_WRITE(sint16, SLE16)
  124. PHYSFS_BYTEORDER_WRITE(uint16, ULE16)
  125. PHYSFS_BYTEORDER_WRITE(sint16, SBE16)
  126. PHYSFS_BYTEORDER_WRITE(uint16, UBE16)
  127. PHYSFS_BYTEORDER_WRITE(sint32, SLE32)
  128. PHYSFS_BYTEORDER_WRITE(uint32, ULE32)
  129. PHYSFS_BYTEORDER_WRITE(sint32, SBE32)
  130. PHYSFS_BYTEORDER_WRITE(uint32, UBE32)
  131. PHYSFS_BYTEORDER_WRITE(sint64, SLE64)
  132. PHYSFS_BYTEORDER_WRITE(uint64, ULE64)
  133. PHYSFS_BYTEORDER_WRITE(sint64, SBE64)
  134. PHYSFS_BYTEORDER_WRITE(uint64, UBE64)
  135.  
  136. /* end of physfs_byteorder.c ... */
  137.  
  138.