src/common/endianness.h

   1 #ifndef COMMON_ENDIANNESS_H_INCLUDED
   2 #define COMMON_ENDIANNESS_H_INCLUDED
   3
   4 #include <stdint.h>
   5
   6 #define SWAP_VAR(a, b) do { unsigned char t = a; a = b; b = t; } while(0)
   7
   8 static inline int16_t short2swap (int16_t x) {
   9   union {
  10     uint8_t a[2];
  11     int16_t x;
  12   } y;
  13   y.x = x;
  14   SWAP_VAR(y.a[0], y.a[1]);
  15   return y.x;
  16 }
  17
  18 static inline int32_t int2swap (int32_t x) {
  19   union {
  20     uint8_t a[4];
  21     int32_t x;
  22   } y;
  23   y.x = x;
  24   SWAP_VAR(y.a[0], y.a[3]);
  25   SWAP_VAR(y.a[1], y.a[2]);
  26   return y.x;
  27 }
  28
  29 #undef SWAP_VAR
  30
  31 static inline int16_t short2host (int16_t x) {
  32 #if __BIG_ENDIAN__
  33   return short2swap(x);
  34 #else
  35   return x;
  36 #endif
  37 }
  38
  39 static inline int32_t int2host (int32_t x) {
  40 #if __BIG_ENDIAN__
  41   return int2swap(x);
  42 #else
  43   return x;
  44 #endif
  45 }
  46
  47 #endif /* COMMON_ENDIANNESS_H_INCLUDED */