unaligned.h

   1 #ifndef unaligned_h
   2 #define unaligned_h
   3
   4 /* Parts of the secnet key-exchange protocol require access to
   5    unaligned big-endian quantities in buffers. These macros provide
   6    convenient access, even on architectures that don't support unaligned
   7    accesses. */
   8
   9 #define put_uint32(a,v) do { (a)[0]=(v)>>24; (a)[1]=((v)&0xff0000)>>16; \
  10 (a)[2]=((v)&0xff00)>>8; (a)[3]=(v)&0xff; } while(0)
  11
  12 #define put_uint16(a,v) do {(a)[0]=((v)&0xff00)>>8; (a)[1]=(v)&0xff;} while(0)
  13
  14 #define get_uint32(a) (((a)[0]<<24)|((a)[1]<<16)|((a)[2])<<8|(a)[3])
  15
  16 #define get_uint16(a) (((a)[0]<<8)|(a)[1])
  17
  18 #define buf_append_uint32(buf,v) do { uint8_t *c=buf_append((buf),4); \
  19     put_uint32(c,(v)); } while(0)
  20
  21 #define buf_append_uint16(buf,v) do { uint8_t *c=buf_append((buf),2); \
  22         put_uint16(c,(v)); } while(0)
  23
  24 #define buf_prepend_uint32(buf,v) do { uint8_t *c=buf_prepend((buf),4); \
  25             put_uint32(c,(v)); } while(0)
  26
  27 #define buf_prepend_uint16(buf,v) do { uint8_t *c=buf_prepend((buf),2); \
  28                 put_uint16(c,(v)); } while(0)
  29
  30 #define buf_unappend_uint32(buf) ({uint8_t *c=buf_unappend((buf),4); \
  31                     get_uint32(c);})
  32
  33 #define buf_unappend_uint16(buf) ({uint8_t *c=buf_unappend((buf),2); \
  34                         get_uint16(c);})
  35
  36 #define buf_unprepend_uint32(buf) ({uint8_t *c=buf_unprepend((buf),4); \
  37                         get_uint32(c);})
  38
  39 #define buf_unprepend_uint16(buf) ({uint8_t *c=buf_unprepend((buf),2); \
  40                         get_uint16(c);})
  41
  42 #endif /* unaligned_h */