endian.h

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#pragma once
#include <stdint.h>
#include <string.h>

#if defined(_MSC_VER)
#define FORCE_INLINE __inline
#elif defined(__GNUC__) || defined(__clang__)
#define FORCE_INLINE __inline__
#else
#define FORCE_INLINE
#endif

 /* Argon2 Team - Begin Code */
 /*
    Not an exhaustive list, but should cover the majority of modern platforms
    Additionally, the code will always be correct---this is only a performance
    tweak.
 */
#if (defined(__BYTE_ORDER__) &&                                                \
     (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)) ||                           \
    defined(__LITTLE_ENDIAN__) || defined(__ARMEL__) || defined(__MIPSEL__) || \
    defined(__AARCH64EL__) || defined(__amd64__) || defined(__i386__) ||       \
    defined(_M_IX86) || defined(_M_X64) || defined(_M_AMD64) ||                \
    defined(_M_ARM)
#define NATIVE_LITTLE_ENDIAN
#endif
 /* Argon2 Team - End Code */

static FORCE_INLINE uint32_t load32(const void *src) {
#if defined(NATIVE_LITTLE_ENDIAN)
    uint32_t w;
    memcpy(&w, src, sizeof w);
    return w;
#else
    const uint8_t *p = (const uint8_t *)src;
    uint32_t w = *p++;
    w |= (uint32_t)(*p++) << 8;
    w |= (uint32_t)(*p++) << 16;
    w |= (uint32_t)(*p++) << 24;
    return w;
#endif
}

static FORCE_INLINE uint64_t load64_native(const void *src) {
    uint64_t w;
    memcpy(&w, src, sizeof w);
    return w;
}

static FORCE_INLINE uint64_t load64(const void *src) {
#if defined(NATIVE_LITTLE_ENDIAN)
    return load64_native(src);
#else
    const uint8_t *p = (const uint8_t *)src;
    uint64_t w = *p++;
    w |= (uint64_t)(*p++) << 8;
    w |= (uint64_t)(*p++) << 16;
    w |= (uint64_t)(*p++) << 24;
    w |= (uint64_t)(*p++) << 32;
    w |= (uint64_t)(*p++) << 40;
    w |= (uint64_t)(*p++) << 48;
    w |= (uint64_t)(*p++) << 56;
    return w;
#endif
}

static FORCE_INLINE void store32(void *dst, uint32_t w) {
#if defined(NATIVE_LITTLE_ENDIAN)
    memcpy(dst, &w, sizeof w);
#else
    uint8_t *p = (uint8_t *)dst;
    *p++ = (uint8_t)w;
    w >>= 8;
    *p++ = (uint8_t)w;
    w >>= 8;
    *p++ = (uint8_t)w;
    w >>= 8;
    *p++ = (uint8_t)w;
#endif
}

static FORCE_INLINE void store64_native(void *dst, uint64_t w) {
    memcpy(dst, &w, sizeof w);
}

static FORCE_INLINE void store64(void *dst, uint64_t w) {
#if defined(NATIVE_LITTLE_ENDIAN)
    store64_native(dst, w);
#else
    uint8_t *p = (uint8_t *)dst;
    *p++ = (uint8_t)w;
    w >>= 8;
    *p++ = (uint8_t)w;
    w >>= 8;
    *p++ = (uint8_t)w;
    w >>= 8;
    *p++ = (uint8_t)w;
    w >>= 8;
    *p++ = (uint8_t)w;
    w >>= 8;
    *p++ = (uint8_t)w;
    w >>= 8;
    *p++ = (uint8_t)w;
    w >>= 8;
    *p++ = (uint8_t)w;
#endif
}