/****************************************************************************

Copyright(c) 2019 by Aerospace C.Power (Chongqing) Microelectronics. ALL RIGHTS RESERVED.

This Information is proprietary to Aerospace C.Power (Chongqing) Microelectronics and MAY NOT
be copied by any method or incorporated into another program without
the express written consent of Aerospace C.Power. This Information or any portion
thereof remains the property of Aerospace C.Power. The Information contained herein
is believed to be accurate and Aerospace C.Power assumes no responsibility or
liability for its use in any way and conveys no license or title under
any patent or copyright and makes no representation or warranty that this
Information is free from patent or copyright infringement.

****************************************************************************/

#include "os_types.h"

#define BIG_LITTLE_ENDIAN_SWAP16(a)  ((((uint16_t)(a) & 0xff00) >> 8) | \
                                      (((uint16_t)(a) & 0x00ff) << 8))

#define BIG_LITTLE_ENDIAN_SWAP32(a)  ((((uint32_t)(a) & 0xff000000) >> 24)| \
                                      (((uint32_t)(a) & 0x00ff0000) >> 8) | \
                                      (((uint32_t)(a) & 0x0000ff00) << 8) | \
                                      (((uint32_t)(a) & 0x000000ff) << 24))

#define LITTLE_ENDIAN              0
#define BIG_ENDIAN                 1
#define UNKNOWN_ENDIAN             0xffffffff

static uint32_t g_cpu_endian = UNKNOWN_ENDIAN;

/*
 * check_cpu_endian() - check cpu's endianess
 * return:
        - 1 bigendian
        - 0 little endian
 */
static uint32_t inline check_cpu_endian()
{
    union{
        uint32_t i;
        uint8_t s[4];
    }c;

    c.i = 0x12345678;
    return (0x12 == c.s[0]);
}

uint32_t iot_htonl(uint32_t h)
{
    if(g_cpu_endian == UNKNOWN_ENDIAN){
        g_cpu_endian = check_cpu_endian();
    }
    return (g_cpu_endian == BIG_ENDIAN)? h : BIG_LITTLE_ENDIAN_SWAP32(h);
}

uint32_t iot_ntohl(uint32_t n)
{
    if(g_cpu_endian == UNKNOWN_ENDIAN){
        g_cpu_endian = check_cpu_endian();
    }
    return (g_cpu_endian == BIG_ENDIAN) ? n : BIG_LITTLE_ENDIAN_SWAP32(n);
}

uint16_t iot_htons(uint16_t h)
{
    if(g_cpu_endian == UNKNOWN_ENDIAN){
        g_cpu_endian = check_cpu_endian();
    }
    return (g_cpu_endian == BIG_ENDIAN) ? h : BIG_LITTLE_ENDIAN_SWAP16(h);
}

uint16_t iot_ntohs(uint16_t n)
{
    if(g_cpu_endian == UNKNOWN_ENDIAN){
        g_cpu_endian = check_cpu_endian();
    }
    return (g_cpu_endian == BIG_ENDIAN) ? n : BIG_LITTLE_ENDIAN_SWAP16(n);
}

uint64_t iot_htonll(uint64_t h)
{
    return (((uint64_t) iot_htonl((uint32_t)h)) << 32) + iot_htonl(h >> 32);
}

uint64_t iot_ntohll(uint64_t n)
{
    return (((uint64_t) iot_ntohl((uint32_t)n)) << 32) + iot_ntohl(n >> 32);
}