#include "stdio.h"
#include "string.h"
#include "malloc.h"

int main(void)
{
    FILE *fin;
    FILE *fout;
    void *fBuffStart = NULL;
    void *fBuffEnd = NULL;
    unsigned long fileSize = 0;
    unsigned short *pDouble = NULL;
    unsigned char *pSingle = NULL;
    fin = fopen("test.mbp", "rb"); //打开文件
    fseek(fin, 0L, SEEK_END);      //获取字节数
    fileSize = ftell(fin);
    fseek(fin, 0L, SEEK_SET);
    fBuffStart = (unsigned char *)malloc(fileSize); //申请内存
    memset(fBuffStart, 0, fileSize);                //清零
    fread(fBuffStart, 1, fileSize, fin);            //把内容读入到fBuffStart
    fclose(fin);                                    //关闭文件指针
    fBuffEnd = (unsigned char *)fBuffStart + fileSize;
    pDouble = (unsigned short *)fBuffStart;
    fout = fopen("out.dat", "wb"); //打开输出文件

    while (pDouble != fBuffEnd)
    {
        pSingle = (unsigned char *)pDouble;
        fwrite(pSingle + 1, 1, 1, fout);
        fwrite(pSingle, 1, 1, fout);
        pDouble++;
    }

    fclose(fout);     //关闭文件指针
    free(fBuffStart); //释放内存
    return 0;
}