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

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

int unicode_to_utf8 ( char* inbuf, size_t* inlen, char* outbuf, size_t* outlen )
{
    char* encTo = "UTF-8//IGNORE";
    char* encFrom = "UNICODE";

    iconv_t cd = iconv_open ( encTo, encFrom );

    if ( cd == ( iconv_t ) - 1 )
        perror ( "iconv_open" );

    char* tmpin = inbuf;
    char* tmpout = outbuf;
    size_t insize = *inlen;
    size_t outsize = *outlen;

    /* 进行转换
     *@param cd iconv_open()产生的句柄
     *@param srcstart 需要转换的字符串
     *@param inlen 存放还有多少字符没有转换
     *@param tempoutbuf 存放转换后的字符串
     *@param outlen 存放转换后,tempoutbuf剩余的空间
     *
     * */
    size_t ret = iconv ( cd, &tmpin, inlen, &tmpout, outlen );

    if ( ret == -1 )
        perror ( "iconv" );

    iconv_close ( cd );

    return outsize - *outlen;
}

size_t utf8_to_unicode ( char* inbuf, size_t* inlen, char* outbuf, size_t* outlen )
{
    char* encTo = "UNICODE//IGNORE";
    char* encFrom = "UTF-8";

    iconv_t cd = iconv_open ( encTo, encFrom );

    if ( cd == ( iconv_t ) - 1 )
        perror ( "iconv_open" );

    int ousize = *outlen;

    size_t ret = iconv ( cd, &inbuf, inlen, &outbuf, outlen );

    if ( ret == -1 )
        perror ( "iconv" );

    iconv_close ( cd );

    return ousize - *outlen;
}

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;
}