一、任务详情
- 在openEuler(推荐)或Ubuntu或Windows(不推荐)中完成下面任务
1 参考《GMT 0009-2012 SM2密码算法使用规范》第6节”数据转换” 在utils.h和utils.c中完成位串与８位字节串的转换功能(10′)：
int Bitstr2ByteArr(unsigned char * bs, unsigned char * ba，int lba);
int ByteArr2Bitstr(unsigned char * ba, unsigned char * bs, int lbs);
2 并写出测试代码测试上述函数(不能与下面代码一样)，比如(10′):
unsigned char bs [] = “1010010100011100”;
int len;
Bitstr2ByteArr(bs, char * ba, &len);
//结果：ba = {0x5, 0x1C}; len=2
char ba[] = {0x5, 0x1C}
ByteArr2Bitstr(char * ba, char * bs);
//结果：bs= “1010010100011100”
3 提交代码（或代码链接）和运行结果
主函数main.c
#include"utils.h"
#include<string.h>
//20191223
int main(){
char ba[100];
char bs[100];
printf("input ByteArr:\n");
scanf("%s",ba);
ByteArr2BitStr(ba,bs);
printf("bitstr:\n");
printf("%s\n",bs);
char baa[100];
char bss[100];
printf("input bitstr:\n");
scanf("%s",bss);
BitStr2ByteArr(bss,baa);
printf("ByteArr:\n");
printf("%s\n",baa);
int a = strlen(baa);
printf("len =%d\n",a/2);
return 0;
}
</string.h>
utils1.c
#include<stdio.h>
#include<string.h>
#include"utils.h"
int Hex2Char(int fromi,char *toc)
{
if(fromi>=0&&fromi<=9) { *toc="fromi+'0';" } else if(fromi>=10&&fromi<=15) { *toc="fromi+'A'-10;" } else printf("error"); return 0; int char2hex(char fromc,int *toi) if(fromc>='0'&& fromc<='9') { *toi="fromc-'0';" } else if(fromc>='A'&& fromc<='f') { *toi="fromc-'A'+10;" } else printf("error"); return 0; int bytearr2bitstr(char *ba,char *bs) i,j,l,k,a; l="strlen(ba);" for(j="0;j<L;j++)" char2hex(ba[j],&a); for(i="0;i<4;i++)" bs[3*(j+1)-i+j]="a%2+'0';" a="a/2;" bs[4*l]="\0" ; bitstr2bytearr(char *bs,char *ba){ i,k,j,l; char string[100];int sum="0;" if(l%4="=1)" strcpy(string,"000"); strcat(string,bs); k="L/4+1;" strcpy(string,"00"); strcpy(string,"0");; strcpy(string,bs); hex2char(sum,&ba[i]); ba[i]="\0" < code></='f')></='9')></=15)></=9)></string.h></stdio.h>
头文件utils.h
#ifndef _UTIL_H_
#define _UTIL_H_
//char Hex2Char(int i);
//int Char2Hex(char c);
int Hex2Char(int fromi,char * toc);
int Char2Hex(char fromc,int * toi);
int Bitstr2ByteArr(char * bs,char * ba);
int ByteArr2Bitstr(char * ba,char * bs);
int Int2ByteArr(int i,char * ba);
int ByteArr2Int(char * ba,int * i);
#endif
运行结果
Original: https://www.cnblogs.com/zzjjyy123/p/16337621.html
Author: 20191223张俊怡
Title: 数据转换-位串字节数组
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