Function XXH_errorcode XXH32_update_endian

BeefySysLib/util/Hash.cpp:588–675

FORCE_INLINE XXH_errorcode XXH32_update_endian (XXH32_state_t* state_in, const void* input, size_t len, XXH_endianess endian)
{
    XXH_istate32_t* state = (XXH_istate32_t *) state_in;
    const BYTE* p = (const BYTE*)input;
    const BYTE* const bEnd = p + len;

#ifdef XXH_ACCEPT_NULL_INPUT_POINTER
    if (input==NULL) return XXH_ERROR;
#endif

    state->total_len += len;

    if (state->memsize + len < 16)   // fill in tmp buffer
    {
        XXH_memcpy(state->memory + state->memsize, input, len);
        state->memsize += (U32)len;
        return XXH_OK;
    }

    if (state->memsize)   // some data left from previous update
    {
        XXH_memcpy(state->memory + state->memsize, input, 16-state->memsize);
        {
            const U32* p32 = (const U32*)state->memory;
            state->v1 += XXH_readLE32(p32, endian) * PRIME32_2;
            state->v1 = XXH_rotl32(state->v1, 13);
            state->v1 *= PRIME32_1;
            p32++;
            state->v2 += XXH_readLE32(p32, endian) * PRIME32_2;
            state->v2 = XXH_rotl32(state->v2, 13);
            state->v2 *= PRIME32_1;
            p32++;
            state->v3 += XXH_readLE32(p32, endian) * PRIME32_2;
            state->v3 = XXH_rotl32(state->v3, 13);
            state->v3 *= PRIME32_1;
            p32++;
            state->v4 += XXH_readLE32(p32, endian) * PRIME32_2;
            state->v4 = XXH_rotl32(state->v4, 13);
            state->v4 *= PRIME32_1;
            p32++;
        }
        p += 16-state->memsize;
        state->memsize = 0;
    }

    if (p <= bEnd-16)
    {
        const BYTE* const limit = bEnd - 16;
        U32 v1 = state->v1;
        U32 v2 = state->v2;
        U32 v3 = state->v3;
        U32 v4 = state->v4;

        do
        {
            v1 += XXH_readLE32((const U32*)p, endian) * PRIME32_2;
            v1 = XXH_rotl32(v1, 13);
            v1 *= PRIME32_1;