/*---------------------------------------------------

Date: 					2014-12-15

Author: 				fangjunmin

Modify:

Description:			编码转换模块

 ----------------------------------------------------*/

#include "encode.h"

#include "stdio.h"

#include <errno.h>

#include <iconv.h>

bool ConvertEncode( const char *from_charset, const char *to_charset, char *inbuf , size_t inlen,char *outbuf, size_t& outlen )

{

    char *pin = inbuf;

    char *pout = outbuf;

    size_t ulInLen = inlen;

    size_t ulOutLen = outlen;

    iconv_t cd = iconv_open(to_charset, from_charset);

    if( cd == (iconv_t)(-1) )

    {

        return false;

    }

    memset(outbuf, 0, outlen);

    int nRet = iconv(cd, &pin, (size_t*)&ulInLen, &pout, (size_t*)&ulOutLen);

   	iconv_close(cd);	//切记

   	outlen -= ulOutLen;

   	if( nRet == -1 )

   	{

   		int nError = errno;

   		switch( nError)

   		{

   		case EINVAL:

   			{

   				return true;

   			}

   		case E2BIG:

			{

				printf("转码失败,转码缓冲不够\n系统错误信息:%m\n");

				return false;

			}

   		case EILSEQ:

			{

				printf("转码失败(有可能同码相转）\n系统错误信息:%m\n");

				return false;

			}

   		default:

			{

				printf("转码失败\n系统错误信息:%m\n");

				return false;

			}

   		}

   	}

   	return true;

}

bool GB2312ToUtf8(const char* szSrc, int iSrcLen, char* szDst, size_t& iDstLen)

 {

	return ConvertEncode("GB18030", "utf-8", (char*)szSrc, iSrcLen, szDst, iDstLen);

 }