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utils.h
#ifndef UTILS_H #define UTILS_H 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
utils.c
#include<stdio.h> #include<utils.h> #include<string.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) { int i,j,l; int len; len = strlen(ba); for(j=0;j<len;j++) { Char2Hex(ba[j],&l); for(i=0;i<4;i++)//4位 { bs[3*(j+1)-i+j] = l%2+'0'; l=l/2; } } bs[4*len]='\0'; } int BitStr2ByteArr(char *bs,char *ba){ int len; len = strlen(bs); char string[100];int i,j,c;int sum=0; if(len%4==1) { strcpy(string,"000"); strcat(string,bs); c=len/4+1; } else if(len%4==2) { strcpy(string,"00"); strcat(string,bs); c=len/4+1; } else if(len%4==3) { strcpy(string,"0");; strcat(string,bs); c=len/4+1; } else { c=len/4; strcpy(string,bs); } for(i=0;i<c;i++) { for(j=0;j<4;j++) { sum=sum*2; sum=sum+(string[4*i+j]-'0'); } Hex2Char(sum,&ba[i]); sum=0; } ba[i]='\0'; }
main.c
#include<stdio.h> #include<utils.h> int main(){ char bytestr[100]; char bitsstr[100]; printf("输入一串字节串"); scanf("%s",bytestr); ByteArr2BitStr(bytestr,bitsstr); printf("计算出的位串为\n"); printf("%s\n",bitsstr); char bytestr_1[100]; char bitsstr_1[100]; printf("请输入一串位串:"); scanf("%s",bitsstr_1); printf("将位串转化为字节数组\n"); BitStr2ByteArr(bitsstr_1,bytestr_1); printf("打印出字节数组:\n"); printf("%s\n",bytestr_1); return 0; }
运行结果