/*
 * =====================================================================================
 *
 * Filename: testcode.cpp
 *
 * Description:
 *
 * Version: 1.0
 * Created: 2017年10月10日 13:37:58
 * Last Modified: 2017年10月10日 13:37:58
 * Revision: none
 * Compiler: gcc
 *
 * Author: zt (),
 * Organization:
 *
 * =====================================================================================
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <windows.h>

int unicode_to_utf8 ( char* inbuf, size_t* inlen, char* outbuf, size_t* outlen )
{
 size_t outsize = *outlen;
 int utf8Count = WideCharToMultiByte(
 CP_UTF8,
 0,
 (LPCWSTR)inbuf,
 (int)(*inlen / sizeof(wchar_t)),
 outbuf,
 (int)outsize,
 NULL,
 NULL);

 if ( utf8Count == 0 )
 {
 fprintf ( stderr, "WideCharToMultiByte failed: %lu\n", GetLastError () );
 return 0;
 }

 *inlen = 0;
 *outlen = outsize - utf8Count;
 return utf8Count;
}

size_t utf8_to_unicode ( char* inbuf, size_t* inlen, char* outbuf, size_t* outlen )
{
 size_t outsize = *outlen;
 int wideCount = MultiByteToWideChar(
 CP_UTF8,
 0,
 inbuf,
 (int)*inlen,
 (LPWSTR)outbuf,
 (int)(outsize / sizeof(wchar_t)));

 if ( wideCount == 0 )
 {
 fprintf ( stderr, "MultiByteToWideChar failed: %lu\n", GetLastError () );
 return 0;
 }

 *inlen = 0;
 *outlen = outsize - ( wideCount * sizeof(wchar_t) );
 return wideCount * sizeof(wchar_t);
}

void printBuffer ( char* buff, int size )
{
 for ( int i = 0; i < size; ++i )
 {
 if ( i % 0x10 == 0 && i != 0 )
 printf ( "\n" );

 printf ( "%02x ", ( unsigned char ) buff[i] );
 }

 printf ( "\n" );

}

int main ()
{
 char text[1024] = "测试";

 size_t inlen = strlen ( text );

 char outbuf[1024] = {};
 size_t outlen = 1024;

 printBuffer ( text, inlen );

 int outsize = utf8_to_unicode ( text, &inlen, outbuf, &outlen );

 printBuffer ( outbuf, outsize );


 char out2[1024] = { 0 };
 size_t outsize2 = 1024;
 size_t insize = outsize;
 int len2 = unicode_to_utf8 ( outbuf, &insize, out2, &outsize2 );
 printBuffer ( out2, len2 );

 return 0;
}