c++ byte和字符串简单加密变形

#include <stdio.h>
#include <string>
#include <iostream>
#include <fstream>
using namespace std;

typedef unsigned char byte;
//typedef unsigned char BYTE; //这个宏

typedef unsigned char BYTE;

//http://www.52ij.com/jishu/cpp/cbyte/5620.html
//c++ byte转int
int bytesToInt(byte* bytes,int size = 4)

{

	int a = bytes[0] & 0xFF;

	a |= ((bytes[1] << 8) & 0xFF00);

	a|= ((bytes[2] << 16) & 0xFF0000);

	a |= ((bytes[3] << 24) & 0xFF000000);

	return a;

}
/*
构造两个参数，一个是BYTE数组，一个是BYTE数组对应的长度，目的是方便后续的for循环进行遍历而不用再此判断。
*/
//http://www.52ij.com/jishu/cpp/cbyte/

string* byteToHexStr(unsigned char byte_arr[], int arr_len)
{
	string* hexstr=new string();
	for (int i=0;i<arr_len;i++)
	{
		char hex1;
		char hex2;
		/*借助C++支持的unsigned和int的强制转换，把unsigned char赋值给int的值，那么系统就会自动完成强制转换*/
		int value=byte_arr[i];
		int S=value/16;
		int Y=value % 16;
		//将C++中unsigned char和int的强制转换得到的商转成字母
		if (S>=0&&S<=9)
			hex1=(char)(48+S);
		else
			hex1=(char)(55+S);
		//将C++中unsigned char和int的强制转换得到的余数转成字母
		if (Y>=0&&Y<=9)
			hex2=(char)(48+Y);
		else
			hex2=(char)(55+Y);
		//最后一步的代码实现，将所得到的两个字母连接成字符串达到目的
		*hexstr=*hexstr+hex1+hex2;
	}
	return hexstr;

}
//加密信息并输出，要指定长度，字串结尾'\0'也可以被加密。再次调用即解密。
void EnCodeLen(char* pStr,unsigned int len)
{
	for(unsigned int i=0;i<len;i++)
	{
		pStr[i]=~(pStr[i]^0x7e);
	}
	//打印加密后字串
	//PrintHexLen(pStr,len);
}

void test001()
{

	char *chs="1234";
	unsigned int len=strlen(chs);
	byte *hehe;
	hehe=(byte*)malloc(sizeof(byte)*len);
	memset(hehe,0,len);
	for (unsigned int i=0;i<len;i++)
	{
		printf("%d\n",chs[i]);
		hehe[i]=chs[i];

	}
	hehe[len]='\0';
	cout<<hehe<<endl;


	int result=bytesToInt(hehe);
	cout<<result<<endl;
	string* str=byteToHexStr(hehe,len);
	cout<<str<<endl;


}
int main( int argc, char* argv[] )
{
	//test001();

	//c++ byte和字符串简单加密变形
	//char dd[]="123456789";
	if(argc<2)
	{

		printf("error arg: %s input.txt",argv[0]);
		return -1;
	}
	if(strcmp("result.txt",argv[1])==0)
	{
		printf("input file cannot be result.txt",argv[0]);
		return -1;

	}
	ifstream input(argv[1]);
	ofstream output("result.txt");
	char line[1024];
	int flag=0;
	if(argc>2)
	{

		flag=1;
	}

	while(input.getline(line,1024)!=NULL)
	{
		
		string str=string(line);
		if(str.empty())
		{
			continue ;

		}
		EnCodeLen(line,strlen(line));
		//printf("%s\n",line);	

		if(flag)
		{
			output<<str<<"==>"<<string(line)<<endl;	

		}else{
			output<<string(line)<<endl;	
		}
			

	}

	output.close();
	system("notepad result.txt");

	return 0;
}