cocos2dx中UTF-8和GBK2312之间的转换

#ifndef _CHARSET_CONVERT_H_
#define _CHARSET_CONVERT_H_

//starios alter
#include <stdlib.h>
#include "stddef.h"
#include <string>
using namespace std;
class CharsetConvert
{
public:
static std::string GBKToUTF8(const char* msg);
static  std::string UTF8ToGBK(const char* msg);
static int code_convert(const char *from_charset, const char *to_charset, const char *inbuf, size_t inlen, char *outbuf, size_t outlen);
static int IsTextUTF8(const char* str,int length);
};
#endif

#include "CharsetConvert.h"
#include <string>
#if(CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
#include "external/win32-specific/icon/include/iconv.h"
#else
#include "iconv/include/iconv.h""
#endif
int CharsetConvert::IsTextUTF8(const char* str,int length)
{
int i;
int nBytes=0;//UFT8可用1-6个字节编码,ASCII用一个字节
char chr;
bool bAllAscii=true; //如果全部都是ASCII, 说明不是UTF-8
for(i=0;i<length;i++)
{
chr= *(str+i);
if( (chr&0x80) != 0 ) // 判断是否ASCII编码,如果不是,说明有可能是UTF-8,ASCII用7位编码,但用一个字节存,最高位标记为0,o0xxxxxxx
bAllAscii= false;
if(nBytes==0) //如果不是ASCII码,应该是多字节符,计算字节数
{
if(chr>=0x80)
{
if(chr>=0xFC&&chr<=0xFD)
nBytes=6;
else if(chr>=0xF8)
nBytes=5;
else if(chr>=0xF0)
nBytes=4;
else if(chr>=0xE0)
nBytes=3;
else if(chr>=0xC0)
nBytes=2;
else
{
return false;
}
nBytes--;
}
}
else //多字节符的非首字节,应为 10xxxxxx
{
if( (chr&0xC0) != 0x80 )
{
return false;
}
nBytes--;
}
}
if( nBytes > 0 ) //违返规则
{
return false;
}
if( bAllAscii ) //如果全部都是ASCII, 说明不是UTF-8
{
return false;
}
return true;
}

int CharsetConvert::code_convert(const char *from_charset, const char *to_charset, const char *inbuf, size_t inlen, char *outbuf, size_t outlen)
{
iconv_t cd;
const char *temp = inbuf;
const char **pin = &temp;
char **pout = &outbuf;
memset(outbuf,0,outlen);
cd = iconv_open(to_charset,from_charset);
if(cd==0) return -1;
if(iconv(cd,pin,&inlen,pout,&outlen)==-1) return -1;
iconv_close(cd);
return 0;
}

std::string CharsetConvert::GBKToUTF8(const char *inbuf)
{
size_t inlen = strlen(inbuf);
char * outbuf = new char[inlen * 2 + 2];
std::string strRet;
if(code_convert("gb2312", "utf-8", inbuf, inlen, outbuf, inlen * 2 + 2) == 0)
{
strRet = outbuf;
}
delete [] outbuf;
return strRet;
}

std::string CharsetConvert::UTF8ToGBK(const char *inbuf)
{
size_t inlen = strlen(inbuf);
char * outbuf = new char[inlen * 2 + 2];
std::string strRet;
if(code_convert("utf-8", "gb2312", inbuf, inlen, outbuf, inlen * 2 + 2) == 0)
{
strRet = outbuf;
}
delete [] outbuf;
return strRet;
}