编码转换程序

/**********************************************

** 文章名称：编码转换程序－－（CentOS 5.0）

** 版权信息：可以任意转载，但要注明出处及作者信息

** 作   者： 隗公万

** 时   间： 2008.4.24

***********************************************/

一、在计算机中存在着许多复杂的编码，不同的场合下需要有不同的编码来应对。下面就看一段编码转换的程序。将编码从一种形式转换成另一种形式。

二、代码。

/********************************************************
** 功能说明 : 字符串编码之间的互相转换
** 输入参数 : fcharset -- 输入格式 tcharset -- 输出格式
** 输入参数 : inbuf -- 输入串 inlen -- 输入长度
** 输入参数 : outlen -- 输出长度
** 输出参数 : outbuf -- 输出串
** 返回参数 : 0 -- 成功 非零 -- 失败
********************************************************/
int
CodeConvert (
        char* fcharset, char* tcharset,
        char* inbuf, int inlen,
        char* outbuf, int outlen
) {

        iconv_t vIconv;
        char** vPin = &inbuf;
        char** vPout = &outbuf;

        /* 判断参数 */
        if (
                fcharset == NULL || tcharset == NULL
                || inbuf == NULL || outbuf == NULL
                || strlen(inbuf) == 0 || inlen == 0
                || outlen == 0
        ) {
                printf("parameter is error!pleaase check your parameter is right?\n");
                return -1;
        }
        /* 以特定编码格式打开 */
        vIconv = iconv_open(tcharset, fcharset);
        if (vIconv == (iconv_t)(-1))
        {
                printf("iconv_open error!\n");

                return -2;
        }
        if (iconv(vIconv, vPin, (unsigned int *)&inlen, vPout, (unsigned int *)&outlen) == -1)
        {
                printf("iconv error!\n");
                return -3;
        }

        iconv_close(vIconv);
        return 0;
}

/********************************************************
** 功能说明 : 文件编码之间的互相转换
** 输入参数 : fcharset -- 输入格式 tcharset -- 输出格式
** 输入参数 : infile -- 输入文件名outfile -- 输出文件名
** 返回参数 : 0 -- 成功 -1 -- 失败
********************************************************/
int
CodeFileConvert (
        char* fcharset, char* tcharset,
        char* infile, char* outfile
) {

        FILE* vInFile = NULL;
        FILE* vOutFile = NULL;

        char vBuffer[SIZE_BUFFER + 1];
        char vInBuffer[SIZE_BUFFER + 1];
        char vOutBuffer[SIZE_BUFFER + 1];

        int inbuflen = 0;
        int i = 0;

               
        int infilelen = strlen(infile);
        int outfilelen = strlen(outfile);
       
       
        memset(vBuffer, 0x00, sizeof(vBuffer));
        memset(vInBuffer, 0x00, sizeof(vInBuffer));
        memset(vOutBuffer, 0x00, sizeof(vOutBuffer));

        /* 判断参数 */
        if (
                fcharset == NULL || tcharset == NULL
                || infile == NULL || outfile == NULL
                || infilelen == 0 || infilelen > 255
                || outfilelen == 0 || outfilelen > 255
        ) {
                printf("parameter is error!\n");
                return -1;
        }

        if ((vInFile=fopen(infile, "rb")) == NULL)
        { /* 打开输入文件 */
                printf("open infile error!\n");
                return -1;
        }
        if ((vOutFile=fopen(outfile, "wb+")) == NULL)
        { /* 创建并打开输出文件 */
                printf("open outfile error!\n");
                fclose(vInFile);
                return -1;
        }

        /* 取文件长度 */
        fseek(vInFile, 0, SEEK_END);

        infilelen = ftell(vInFile);
        fseek(vInFile, 0, SEEK_SET);

        /* 读取文件内容(256Bytes) */
        while ((inbuflen=fread(vInBuffer, 1, SIZE_BUFFER_256, vInFile)) != 0)
        {
                i = inbuflen;
                while (1)
                {
                        if (i <= 0) break;
                        strncpy(vBuffer, vInBuffer, i);
                        if (CodeConvert(fcharset, tcharset, vBuffer, i, vOutBuffer, SIZE_BUFFER) == 0)
                        {
                                fseek(vInFile, -(inbuflen-i), SEEK_CUR);
                                break;
                        }
                        i--;
                }
                if (i <= 0)
                {
                        /* 这里可以增加对外字之类的处理 */
                        printf("convert codeing failed!\n");
                        fclose(vInFile);
                        fclose(vOutFile);
                        return -1;
                }
                fwrite(vOutBuffer, 1, strlen(vOutBuffer), vOutFile);
                memset(vInBuffer, 0x00, sizeof(vInBuffer));
                memset(vOutBuffer, 0x00, sizeof(vOutBuffer));
        }

        fclose(vInFile);
        fclose(vOutFile);
        return 0;

}


三、直接写个简单的Main函数调用即可。