serpent: Ad-hoc debugging facility

[secnet] / unaligned.h

#ifndef unaligned_h
#define unaligned_h

#include <stdint.h>
#include "util.h"

/* Parts of the secnet key-exchange protocol require access to
   unaligned big-endian quantities in buffers. These macros provide
   convenient access, even on architectures that don't support unaligned
   accesses. */

#define put_uint32(a,v) do { (a)[0]=(v)>>24; (a)[1]=((v)&0xff0000)>>16; \
(a)[2]=((v)&0xff00)>>8; (a)[3]=(v)&0xff; } while(0)

#define put_uint16(a,v) do {(a)[0]=((v)&0xff00)>>8; (a)[1]=(v)&0xff;} while(0)

#define put_uint8(a,v) do {(a)[0]=((v)&0xff);} while(0)

#define get_uint32(a)					\
  (((uint32_t)(a)[0]<<24) | ((uint32_t)(a)[1]<<16) |	\
   ((uint32_t)(a)[2]<<8)  |  (uint32_t)(a)[3])

#define get_uint16(a) (((uint16_t)(a)[0]<<8)|(uint16_t)(a)[1])

#define get_uint8(a) (((uint8_t)(a)[0]))

#define UNALIGNED_DEF_FORTYPE(type,appre)				\
static inline void buf_##appre##_##type(struct buffer_if *buf, type##_t v) \
{									\
    uint8_t *c=buf_##appre(buf,sizeof(type##_t));			\
    put_##type(c,v);							\
}									\
static inline type##_t buf_un##appre##_##type(struct buffer_if *buf)	\
{									\
    const uint8_t *c=buf_un##appre(buf,sizeof(type##_t));		\
    return get_##type(c);						\
}

UNALIGNED_DEF_FORTYPE(uint32,append)
UNALIGNED_DEF_FORTYPE(uint16,append)
UNALIGNED_DEF_FORTYPE(uint8,append)
UNALIGNED_DEF_FORTYPE(uint32,prepend)
UNALIGNED_DEF_FORTYPE(uint16,prepend)
UNALIGNED_DEF_FORTYPE(uint8,prepend)

#endif /* unaligned_h */