isa-l/include/unaligned.h

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#ifndef UNALIGNED_H
#define UNALIGNED_H

#include "stdint.h"
#include "stdlib.h"
#include "string.h"

#if defined(__FreeBSD__) || defined(__NetBSD__)
#include <sys/types.h>
#include <sys/endian.h>
#define isal_bswap16(x) bswap16(x)
#define isal_bswap32(x) bswap32(x)
#define isal_bswap64(x) bswap64(x)
#elif defined(__APPLE__)
#include <libkern/OSByteOrder.h>
#define isal_bswap16(x) OSSwapInt16(x)
#define isal_bswap32(x) OSSwapInt32(x)
#define isal_bswap64(x) OSSwapInt64(x)
#elif defined(__GNUC__) && !defined(__MINGW32__)
#include <byteswap.h>
#define isal_bswap16(x) bswap_16(x)
#define isal_bswap32(x) bswap_32(x)
#define isal_bswap64(x) bswap_64(x)
#elif defined _WIN32
#define isal_bswap16(x) _byteswap_ushort(x)
#define isal_bswap32(x) _byteswap_ulong(x)
#define isal_bswap64(x) _byteswap_uint64(x)
#endif

#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define to_be16(x)   isal_bswap16(x)
#define from_be16(x) isal_bswap16(x)
#define to_be32(x)   isal_bswap32(x)
#define from_be32(x) isal_bswap32(x)
#define to_be64(x)   isal_bswap64(x)
#define from_be64(x) isal_bswap64(x)
#define to_le16(x)   (x)
#define from_le16(x) (x)
#define to_le32(x)   (x)
#define from_le32(x) (x)
#define to_le64(x)   (x)
#define from_le64(x) (x)
#else
#define to_be16(x)   (x)
#define from_be16(x) (x)
#define to_be32(x)   (x)
#define from_be32(x) (x)
#define to_be64(x)   (x)
#define from_be64(x) (x)
#define to_le16(x)   isal_bswap16(x)
#define from_le16(x) isal_bswap16(x)
#define to_le32(x)   isal_bswap32(x)
#define from_le32(x) isal_bswap32(x)
#define to_le64(x)   isal_bswap64(x)
#define from_le64(x) isal_bswap64(x)
#endif

static inline uint16_t
load_native_u16(uint8_t *buf)
{
        uint16_t ret;
        memcpy(&ret, buf, sizeof(ret));
        return ret;
}

static inline uint16_t
load_le_u16(uint8_t *buf)
{
        return from_le16(load_native_u16(buf));
}

static inline uint16_t
load_be_u16(uint8_t *buf)
{
        return from_be16(load_native_u16(buf));
}

static inline uint32_t
load_native_u32(uint8_t *buf)
{
        uint32_t ret;
        memcpy(&ret, buf, sizeof(ret));
        return ret;
}

static inline uint32_t
load_le_u32(uint8_t *buf)
{
        return from_le32(load_native_u32(buf));
}

static inline uint32_t
load_be_u32(uint8_t *buf)
{
        return from_be32(load_native_u32(buf));
}

static inline uint64_t
load_native_u64(uint8_t *buf)
{
        uint64_t ret;
        memcpy(&ret, buf, sizeof(ret));
        return ret;
}

static inline uint64_t
load_le_u64(uint8_t *buf)
{
        return from_le64(load_native_u64(buf));
}

static inline uint64_t
load_be_u64(uint8_t *buf)
{
        return from_be64(load_native_u64(buf));
}

static inline uintmax_t
load_le_umax(uint8_t *buf)
{
        switch (sizeof(uintmax_t)) {
        case sizeof(uint32_t):
                return from_le32(load_native_u32(buf));
        case sizeof(uint64_t):
                return from_le64(load_native_u64(buf));
        default:
                return 0;
        }
}

static inline void
store_native_u16(uint8_t *buf, uint16_t val)
{
        memcpy(buf, &val, sizeof(val));
}

static inline void
store_le_u16(uint8_t *buf, uint16_t val)
{
        store_native_u16(buf, to_le16(val));
}

static inline void
store_be_u16(uint8_t *buf, uint16_t val)
{
        store_native_u16(buf, to_be16(val));
}

static inline void
store_native_u16_to_u64(uint64_t *buf, uint16_t val)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
        store_native_u16((uint8_t *) buf, val);
#else
        store_native_u16((uint8_t *) buf + 6, val);
#endif
}

static inline void
store_native_u32(uint8_t *buf, uint32_t val)
{
        memcpy(buf, &val, sizeof(val));
}

static inline void
store_le_u32(uint8_t *buf, uint32_t val)
{
        store_native_u32(buf, to_le32(val));
}

static inline void
store_be_u32(uint8_t *buf, uint32_t val)
{
        store_native_u32(buf, to_be32(val));
}

static inline void
store_native_u64(uint8_t *buf, uint64_t val)
{
        memcpy(buf, &val, sizeof(val));
}

static inline void
store_le_u64(uint8_t *buf, uint64_t val)
{
        store_native_u64(buf, to_le64(val));
}

static inline void
store_be_u64(uint8_t *buf, uint64_t val)
{
        store_native_u64(buf, to_be64(val));
}

#endif