C++ json string 發送之 base64

http://www.cnblogs.com/ytjjyy/archive/2012/05/07/2487191.html #ifndef _ZBASE64 #define _ZBASE64

#pragma warning(disable:4786) #include <string> using namespace std;

class ZBase64 {

private:

//Base64編碼解碼錶 char* m_Base64_Table;

public:

//構造 ZBase64();

//編碼 string EncodeBase64(const string strSource);

//解碼 string DecodeBase64(const string strSource); }; #endif

複製代碼 複製代碼

#include "http://www.cnblogs.com/src/utility/base64.h"

ZBase64::ZBase64() { //Base64編碼表 this->m_Base64_Table="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; }

string ZBase64::EncodeBase64(const string strSource) { /*

• 如下是操做二進制數時用到的
• 11111100 0xFC
• 11000000 0x3
• 11110000 0xF0
• 00001111 0xF
• 11000000 0xC0
• 00111111 0x3F */

string strEncode; char cTemp[4];

//行長,MIME規定Base64編碼行長爲76字節 int LineLength=0;

for(int i=0;i<strSource.size();i+=3) { memset(cTemp,0,4);

cTemp[0]=strSource[i]; cTemp[1]=strSource[i+1]; cTemp[2]=strSource[i+2];

int len=strlen(cTemp); if(len==3) { strEncode+=this->m_Base64_Table[((int)cTemp[0] & 0xFC)>>2]; strEncode+=this->m_Base64_Table[((int)cTemp[0] & 0x3)<<4 | ((int)cTemp[1] & 0xF0)>>4]; strEncode+=this->m_Base64_Table[((int)cTemp[1] & 0xF)<<2 | ((int)cTemp[2] & 0xC0)>>6]; strEncode+=this->m_Base64_Table[(int)cTemp[2] & 0x3F]; if(LineLength+=4>=76) strEncode+="\r\n"; } else if(len==2) { strEncode+=this->m_Base64_Table[((int)cTemp[0] & 0xFC)>>2]; strEncode+=this->m_Base64_Table[((int)cTemp[0] & 0x3 )<<4 | ((int)cTemp[1] & 0xF0 )>>4]; strEncode+=this->m_Base64_Table[((int)cTemp[1] & 0x0F)<<2]; if(LineLength+=4>=76) strEncode+="\r\n"; strEncode+="="; } else if(len==1) { strEncode+=this->m_Base64_Table[((int)cTemp[0] & 0xFC)>>2]; strEncode+=this->m_Base64_Table[((int)cTemp[0] & 0x3 )<<4]; if(LineLength+=4>=76) strEncode+="\r\n"; strEncode+="=="; } memset(cTemp,0,4); } return strEncode; }

string ZBase64::DecodeBase64(const string strSource) { //返回值 string strDecode; char cTemp[5];

for(int i=0;i<strSource.size();i+=4) { memset(cTemp,0,5);

cTemp[0]=strSource[i]; cTemp[1]=strSource[i+1]; cTemp[2]=strSource[i+2]; cTemp[3]=strSource[i+3];

int asc[4]; for(int j=0;j<4;j++) { for(int k=0;k<(int)strlen(this->m_Base64_Table);k++) { if(cTemp[j]==this->m_Base64_Table[k]) asc[j]=k; } } if('='==cTemp[2] && '='==cTemp[3]) { strDecode+=(char)(int)(asc[0] << 2 | asc[1] << 2 >> 6); } else if('='==cTemp[3]) { strDecode+=(char)(int)(asc[0] << 2 | asc[1] << 2 >> 6); strDecode+=(char)(int)(asc[1] << 4 | asc[2] << 2 >> 4); } else { strDecode+=(char)(int)(asc[0] << 2 | asc[1] << 2 >> 6); strDecode+=(char)(int)(asc[1] << 4 | asc[2] << 2 >> 4); strDecode+=(char)(int)(asc[2] << 6 | asc[3] << 2 >> 2); } } return strDecode; }