tarsnap/libcperciva/util/sysendian.h

#ifndef SYSENDIAN_H_
#define SYSENDIAN_H_

#include <stdint.h>

/* Avoid namespace collisions with BSD <sys/endian.h>. */
#define be16dec libcperciva_be16dec
#define be16enc libcperciva_be16enc
#define be32dec libcperciva_be32dec
#define be32enc libcperciva_be32enc
#define be64dec libcperciva_be64dec
#define be64enc libcperciva_be64enc
#define le16dec libcperciva_le16dec
#define le16enc libcperciva_le16enc
#define le32dec libcperciva_le32dec
#define le32enc libcperciva_le32enc
#define le64dec libcperciva_le64dec
#define le64enc libcperciva_le64enc

static inline uint16_t
be16dec(const void * pp)
{
	const uint8_t * p = (uint8_t const *)pp;

	return (uint16_t)((uint16_t)(p[1]) | ((uint16_t)(p[0]) << 8));
}

static inline void
be16enc(void * pp, uint16_t x)
{
	uint8_t * p = (uint8_t *)pp;

	p[1] = x & 0xff;
	p[0] = (x >> 8) & 0xff;
}

static inline uint32_t
be32dec(const void * pp)
{
	const uint8_t * p = (uint8_t const *)pp;

	return ((uint32_t)(p[3]) | ((uint32_t)(p[2]) << 8) |
	    ((uint32_t)(p[1]) << 16) | ((uint32_t)(p[0]) << 24));
}

static inline void
be32enc(void * pp, uint32_t x)
{
	uint8_t * p = (uint8_t *)pp;

	p[3] = x & 0xff;
	p[2] = (x >> 8) & 0xff;
	p[1] = (x >> 16) & 0xff;
	p[0] = (x >> 24) & 0xff;
}

static inline uint64_t
be64dec(const void * pp)
{
	const uint8_t * p = (uint8_t const *)pp;

	return ((uint64_t)(p[7]) | ((uint64_t)(p[6]) << 8) |
	    ((uint64_t)(p[5]) << 16) | ((uint64_t)(p[4]) << 24) |
	    ((uint64_t)(p[3]) << 32) | ((uint64_t)(p[2]) << 40) |
	    ((uint64_t)(p[1]) << 48) | ((uint64_t)(p[0]) << 56));
}

static inline void
be64enc(void * pp, uint64_t x)
{
	uint8_t * p = (uint8_t *)pp;

	p[7] = x & 0xff;
	p[6] = (x >> 8) & 0xff;
	p[5] = (x >> 16) & 0xff;
	p[4] = (x >> 24) & 0xff;
	p[3] = (x >> 32) & 0xff;
	p[2] = (x >> 40) & 0xff;
	p[1] = (x >> 48) & 0xff;
	p[0] = (x >> 56) & 0xff;
}

static inline uint16_t
le16dec(const void * pp)
{
	const uint8_t * p = (uint8_t const *)pp;

	return (uint16_t)((uint16_t)(p[0]) | ((uint16_t)(p[1]) << 8));
}

static inline void
le16enc(void * pp, uint16_t x)
{
	uint8_t * p = (uint8_t *)pp;

	p[0] = x & 0xff;
	p[1] = (x >> 8) & 0xff;
}

static inline uint32_t
le32dec(const void * pp)
{
	const uint8_t * p = (uint8_t const *)pp;

	return ((uint32_t)(p[0]) | ((uint32_t)(p[1]) << 8) |
	    ((uint32_t)(p[2]) << 16) | ((uint32_t)(p[3]) << 24));
}

static inline void
le32enc(void * pp, uint32_t x)
{
	uint8_t * p = (uint8_t *)pp;

	p[0] = x & 0xff;
	p[1] = (x >> 8) & 0xff;
	p[2] = (x >> 16) & 0xff;
	p[3] = (x >> 24) & 0xff;
}

static inline uint64_t
le64dec(const void * pp)
{
	const uint8_t * p = (uint8_t const *)pp;

	return ((uint64_t)(p[0]) | ((uint64_t)(p[1]) << 8) |
	    ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
	    ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40) |
	    ((uint64_t)(p[6]) << 48) | ((uint64_t)(p[7]) << 56));
}

static inline void
le64enc(void * pp, uint64_t x)
{
	uint8_t * p = (uint8_t *)pp;

	p[0] = x & 0xff;
	p[1] = (x >> 8) & 0xff;
	p[2] = (x >> 16) & 0xff;
	p[3] = (x >> 24) & 0xff;
	p[4] = (x >> 32) & 0xff;
	p[5] = (x >> 40) & 0xff;
	p[6] = (x >> 48) & 0xff;
	p[7] = (x >> 56) & 0xff;
}

#endif /* !SYSENDIAN_H_ */