程序代码：

#include <stdio.h>
#define FALSE 0
#define TRUE 1
#define MAX_BUF_LEN 1500
#define SOH 0x01
#define EOT 0x04
#define ESC 0x1B

typedef int Status;

typedef struct StuffingString{
    unsigned char buf[MAX_BUF_LEN];
    unsigned int len;
}*PStuffingString;

Status byte_stuffing(PStuffingString psin,PStuffingString psf){
    unsigned int i = 0;
    psf->len = 0;
    while(i<psin->len)
    {
        if(psin->buf[i]==SOH||psin->buf[i]==EOT||psin->buf[i]==ESC)
            psf->buf[psf->len++]=ESC;
        psf->buf[psf->len++]=psin->buf[i++];
    }
    return TRUE;
}

Status byte_unstuffing(PStuffingString psf,PStuffingString psd){
    unsigned int i = 0;
    psd->len = 0;
    while(i<psf->len)
    {
        if(psf->buf[i]==ESC)
        {
            i++;
            if(psf->buf[i]!= SOH && psf->buf[i]!= EOT && psf->buf[i]!= ESC)
                return FALSE;
        }
            psd->buf[psd->len++]=psf->buf[i++];
    }
    return TRUE;
}

Status input(char f[],PStuffingString psin){
    FILE *fp;
    psin->len = 0;
    if((fp = fopen(f,"r"))==NULL)
        return FALSE;
    while(fscanf(fp,"%2X",&psin->buf[psin->len++])!=EOF);
    psin->len--;
    if(fclose(fp))
        return FALSE;
    return TRUE;
}

Status output(char f[],PStuffingString psout){
    FILE *fp;
    unsigned int i = 0;
    if((fp = fopen(f,"w"))==NULL)
        return FALSE;
    while(i<psout->len)
    {
        if(psout->buf[i]<0x10)
            fprintf(fp,"0");
        fprintf(fp,"%0X",psout->buf[i++]);
    }
    if(fclose(fp))
        return FALSE;
    return TRUE;
}
void fun_01()
{
    StuffingString sin,sf,sd;
    if(input("C:\input.txt",&sin)==TRUE)
    {
        if(byte_stuffing(&sin,&sf)==TRUE)
        {
            output("C:\output_f.txt",&sf);
            if(byte_unstuffing(&sin,&sf)==TRUE)
            {
                output("C:\output_d.txt",&sd);
                printf("byte-stuffing/unstuffing successful!\n");
            }
        }
    }
}
void main ()
{
    fun_01();
}