strCoding.cpp

#include "StdAfx.h"    
#include "strCoding.h"    
//这是个类strCoding (strCoding.cpp文件)    

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高低字的顺序,低字节在前，高字节在后    
	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;
}

//做为解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 转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 转为 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)
	{
		//如果是英文直接复制就可以    
		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编码为网页中的 GB2312 url encode ,英文不变，汉字双字节 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编码为网页中的 UTF-8 url encode ,英文不变，汉字三字节 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解码    
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解码    
string strCoding::UrlUTF8Decode(string str)
{
	string output = "";

	string temp = UrlGB2312Decode(str);//    

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

	return output;

}