大端模式和小端模式相互转换，C语言方式实现

                  大端模式和小端模式相互转换，C语言方式实现

GitHub仓库：https://github.com/XinLiGH/BigAndLittleEndianConversion

PS：博文不再更新，后续更新会在GitHub仓库进行。

 

大端模式和小端模式相互转换，C语言方式实现。程序中涉及到数据存放顺序的概念，详细介绍见维基百科[Endianness](https://en.wikipedia.org/wiki/Endianness)。

 

1，开发环境

      1，操作系统：Windows 10 专业版

      2，IDE：Visual Studio 2017 专业版

 

2，程序源码

     main.c文件

/**
  ******************************************************************************
  * @file    main.c
  * @author  XinLi
  * @version v1.0
  * @date    24-May-2020
  * @brief   Main program body.
  ******************************************************************************
  * @attention
  *
  * 
Copyright © 2020 XinLi
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see .
  *
  ******************************************************************************
  */

/* Header includes -----------------------------------------------------------*/
#include 
#include 

/* Macro definitions ---------------------------------------------------------*/
/* Type definitions ----------------------------------------------------------*/
/* Variable declarations -----------------------------------------------------*/
/* Variable definitions ------------------------------------------------------*/
/* Function declarations -----------------------------------------------------*/
static void BigAndLittleEndianConversion(void *data, uint32_t size);

/* Function definitions ------------------------------------------------------*/

/**
  * @brief  Big and little endian conversion.
  * @param  [in] data: The pointer of the data to be converted.
  * @param  [in] size: The size of the data to be converted.
  * @return None.
  */
static void BigAndLittleEndianConversion(void *data, uint32_t size)
{
  for(uint32_t i = 1; i < size; i++)
  {
    for(uint32_t j = 1; j < size - i + 1; j++)
    {
      uint8_t c = *(((uint8_t *)data) + j - 1);
      *(((uint8_t *)data) + j - 1) = *(((uint8_t *)data) + j);
      *(((uint8_t *)data) + j) = c;
    }
  }
}

/**
  * @brief  Main program.
  * @param  None.
  * @return None.
  */
int main(void)
{
  uint8_t  littleEndianDataBuffer[4] = {(uint8_t)(123456789>>0),  (uint8_t)(123456789>>8),  (uint8_t)(123456789>>16), (uint8_t)(123456789>>24)};
  uint8_t  bigEndianDataBuffer[4]    = {(uint8_t)(123456789>>24), (uint8_t)(123456789>>16), (uint8_t)(123456789>>8),  (uint8_t)(123456789>>0)};
  uint32_t littleEndianData          = *(uint32_t *)littleEndianDataBuffer;
  uint32_t bigEndianData             = *(uint32_t *)bigEndianDataBuffer;
  
  BigAndLittleEndianConversion(&bigEndianData, sizeof(bigEndianData));
  
  if(littleEndianData == bigEndianData)
  {
    printf("bigEndianData = %u", bigEndianData);
  }
  
  while(1)
  {
  }
}