//這是個類strCoding (strCoding.h文件)
#pragma once
#include <iostream>
#include <string>
#include <windows.h>
using namespace std;

class strCoding
{
public:
strCoding(void);
~strCoding(void);

void UTF_8ToGB2312(string &pOut, char *pText, int pLen);//utf_8轉為gb2312
void GB2312ToUTF_8(string& pOut,char *pText, int pLen); //gb2312 轉utf_8
string UrlGB2312(char * str); //urlgb2312編碼
string UrlUTF8(char * str); //urlutf8 編碼
string UrlUTF8Decode(string str); //urlutf8解碼
string UrlGB2312Decode(string str); //urlgb2312解碼

private:
void Gb2312ToUnicode(WCHAR* pOut,char *gbBuffer);
void UTF_8ToUnicode(WCHAR* pOut,char *pText);
void UnicodeToUTF_8(char* pOut,WCHAR* pText);
void UnicodeToGB2312(char* pOut,WCHAR uData);
char CharToInt(char ch);
char StrToBin(char *str);

};
//這是個類strCoding (strCoding.cpp文件)
#include "StdAfx.h"

#include ".\strcoding.h"



strCoding::strCoding(void)
{
}

strCoding::~strCoding(void)
{
}
void strCoding::Gb2312ToUnicode(WCHAR* pOut,char *gbBuffer)
{
::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,pOut,1);
return;
}
void strCoding::UTF_8ToUnicode(WCHAR* pOut,char *pText)
{
char* uchar = (char *)pOut;

uchar[1] = ((pText[0] & 0x0F) << 4) + ((pText[1] >> 2) & 0x0F);
uchar[0] = ((pText[1] & 0x03) << 6) + (pText[2] & 0x3F);

return;
}

void strCoding::UnicodeToUTF_8(char* pOut,WCHAR* pText)
{
// 注意 WCHAR高低字的順序,低字節在前，高字節在后
char* pchar = (char *)pText;

pOut[0] = (0xE0 | ((pchar[1] & 0xF0) >> 4));
pOut[1] = (0x80 | ((pchar[1] & 0x0F) << 2)) + ((pchar[0] & 0xC0) >> 6);
pOut[2] = (0x80 | (pchar[0] & 0x3F));

return;
}
void strCoding::UnicodeToGB2312(char* pOut,WCHAR uData)
{
WideCharToMultiByte(CP_ACP,NULL,&uData,1,pOut,sizeof(WCHAR),NULL,NULL);
return;
}

//做為解Url使用
char strCoding:: CharToInt(char ch){
if(ch>='0' && ch<='9')return (char)(ch-'0');
if(ch>='a' && ch<='f')return (char)(ch-'a'+10);
if(ch>='A' && ch<='F')return (char)(ch-'A'+10);
return -1;
}
char strCoding::StrToBin(char *str){
char tempWord[2];
char chn;

tempWord[0] = CharToInt(str[0]); //make the B to 11 -- 00001011
tempWord[1] = CharToInt(str[1]); //make the 0 to 0 -- 00000000

chn = (tempWord[0] << 4) | tempWord[1]; //to change the BO to 10110000

return chn;
}


//UTF_8 轉gb2312
void strCoding::UTF_8ToGB2312(string &pOut, char *pText, int pLen)
{
char buf[4];
char* rst = new char[pLen + (pLen >> 2) + 2];
memset(buf,0,4);
memset(rst,0,pLen + (pLen >> 2) + 2);

int i =0;
int j = 0;

while(i < pLen)
{
if(*(pText + i) >= 0)
{

rst[j++] = pText[i++];
}
else
{
WCHAR Wtemp;


UTF_8ToUnicode(&Wtemp,pText + i);

UnicodeToGB2312(buf,Wtemp);

unsigned short int tmp = 0;
tmp = rst[j] = buf[0];
tmp = rst[j+1] = buf[1];
tmp = rst[j+2] = buf[2];

//newBuf[j] = Ctemp[0];
//newBuf[j + 1] = Ctemp[1];

i += 3;
j += 2;
}

}
rst[j]='\0';
pOut = rst;
delete []rst;
}

//GB2312 轉為 UTF-8
void strCoding::GB2312ToUTF_8(string& pOut,char *pText, int pLen)
{
char buf[4];
memset(buf,0,4);

pOut.clear();

int i = 0;
while(i < pLen)
{
//如果是英文直接復制就可以
if( pText[i] >= 0)
{
char asciistr[2]={0};
asciistr[0] = (pText[i++]);
pOut.append(asciistr);
}
else
{
WCHAR pbuffer;
Gb2312ToUnicode(&pbuffer,pText+i);

UnicodeToUTF_8(buf,&pbuffer);

pOut.append(buf);

i += 2;
}
}

return;
}
//把str編碼為網頁中的 GB2312 url encode ,英文不變，漢字雙字節 如%3D%AE%88
string strCoding::UrlGB2312(char * str)
{
string dd;
size_t len = strlen(str);
for (size_t i=0;i<len;i++)
{
if(isalnum((BYTE)str[i]))
{
char tempbuff[2];
sprintf(tempbuff,"%c",str[i]);
dd.append(tempbuff);
}
else if (isspace((BYTE)str[i]))
{
dd.append("+");
}
else
{
char tempbuff[4];
sprintf(tempbuff,"%%%X%X",((BYTE*)str)[i] >>4,((BYTE*)str)[i] %16);
dd.append(tempbuff);
}

}
return dd;
}

//把str編碼為網頁中的 UTF-8 url encode ,英文不變，漢字三字節 如%3D%AE%88

string strCoding::UrlUTF8(char * str)
{
string tt;
string dd;
GB2312ToUTF_8(tt,str,(int)strlen(str));

size_t len=tt.length();
for (size_t i=0;i<len;i++)
{
if(isalnum((BYTE)tt.at(i)))
{
char tempbuff[2]={0};
sprintf(tempbuff,"%c",(BYTE)tt.at(i));
dd.append(tempbuff);
}
else if (isspace((BYTE)tt.at(i)))
{
dd.append("+");
}
else
{
char tempbuff[4];
sprintf(tempbuff,"%%%X%X",((BYTE)tt.at(i)) >>4,((BYTE)tt.at(i)) %16);
dd.append(tempbuff);
}

}
return dd;
}
//把url GB2312解碼
string strCoding::UrlGB2312Decode(string str)
{
string output="";
char tmp[2];
int i=0,idx=0,ndx,len=str.length();

while(i<len){
if(str[i]=='%'){
tmp[0]=str[i+1];
tmp[1]=str[i+2];
output += StrToBin(tmp);
i=i+3;
}
else if(str[i]=='+'){
output+=' ';
i++;
}
else{
output+=str[i];
i++;
}
}

return output;
}
//把url utf8解碼
string strCoding::UrlUTF8Decode(string str)
{
string output="";

string temp =UrlGB2312Decode(str);//

UTF_8ToGB2312(output,(char *)temp.data(),strlen(temp.data()));

return output;

}

//test
#include "stdafx.h"
#include "strCoding.h"

using namespace std;


int main()
{

strCoding cfm;
string keyword="大家好,歡迎你";
string Temp="";
string Output="";

//把關鍵字做url的utf8編碼
Temp= cfm.UrlUTF8((char *)keyword.data());
cout<<Temp<<endl;

//把url的utf8編碼的結果解碼
Temp =cfm.UrlUTF8Decode(Temp);
cout<<Temp<<endl;

//把關鍵字做url的gb2312編碼
Temp =cfm.UrlGB2312((char *)keyword.data());
cout<<Temp<<endl;

//把url的gb2312編碼的結果解碼
Temp =cfm.UrlGB2312Decode(Temp);
cout<<Temp<<endl;


//把關鍵字GB2312轉UTF_8

cfm.GB2312ToUTF_8(Output,(char *)keyword.data(),strlen(keyword.data()));
cout<<Output<<endl;

//把GB2312轉UTF_8轉為中文
cfm.UTF_8ToGB2312(Temp,(char *)Output.data(),strlen(Output.data()));
cout<<Temp<<endl;


//system("pasue");
getchar();

return 0;
//
}


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