components/common/endian/le.c

/*
 * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include "le.h"

uint8_t  load_u8_le(const void *base, size_t offset)
{
    const uint8_t *v = (const uint8_t*)base + offset;
    uint8_t r = v[0];

    return r;
}

uint16_t load_u16_le(const void *base, size_t offset)
{
    const uint8_t *v = (const uint8_t*)base + offset;
    uint16_t r = 0;
    r |= (uint16_t)v[0];
    r |= (uint16_t)v[1] << 8;

    return r;
}

uint32_t load_u32_le(const void *base, size_t offset)
{
    const uint8_t *v = (const uint8_t*)base + offset;
    uint32_t r = 0;
    r |= (uint32_t)v[0];
    r |= (uint32_t)v[1] << 8;
    r |= (uint32_t)v[2] << 16;
    r |= (uint32_t)v[3] << 24;

    return r;
}

uint64_t load_u64_le(const void *base, size_t offset)
{
    const uint8_t *v = (const uint8_t*)base + offset;
    uint64_t r = 0;
    r |= (uint64_t)v[0];
    r |= (uint64_t)v[1] << 8;
    r |= (uint64_t)v[2] << 16;
    r |= (uint64_t)v[3] << 24;
    r |= (uint64_t)v[4] << 32;
    r |= (uint64_t)v[5] << 40;
    r |= (uint64_t)v[6] << 48;
    r |= (uint64_t)v[7] << 56;

    return r;
}

void store_u8_le(void *base, size_t offset, uint8_t val)
{
    uint8_t *v = (uint8_t*)base + offset;
    v[0] = val;
}

void store_u16_le(void *base, size_t offset, uint16_t val)
{
    uint8_t *v = (uint8_t*)base + offset;

    v[0] = (uint8_t)(val & 0xff);
    v[1] = (uint8_t)((val >> 8) & 0xff);
}

void store_u32_le(void *base, size_t offset, uint32_t val)
{
    uint8_t *v = (uint8_t*)base + offset;

    v[0] = (uint8_t)(val & 0xff);
    v[1] = (uint8_t)((val >> 8) & 0xff);
    v[2] = (uint8_t)((val >> 16) & 0xff);
    v[3] = (uint8_t)((val >> 24) & 0xff);
}

void store_u64_le(void *base, size_t offset, uint64_t val)
{
    uint8_t *v = (uint8_t*)base + offset;

    v[0] = (uint8_t)(val & 0xff);
    v[1] = (uint8_t)((val >> 8) & 0xff);
    v[2] = (uint8_t)((val >> 16) & 0xff);
    v[3] = (uint8_t)((val >> 24) & 0xff);
    v[4] = (uint8_t)((val >> 32) & 0xff);
    v[5] = (uint8_t)((val >> 40) & 0xff);
    v[6] = (uint8_t)((val >> 48) & 0xff);
    v[7] = (uint8_t)((val >> 56) & 0xff);
}