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最近一段做一些关于文字编码方面的东西,常常涉及到各种编码字符之间的转换。主要是做中日文方面的,包括中文gb2312, 日文JIS, SHIFT-JIS,以及他们和Unnicode码之间的转换。

一 GBK <==> Unicode

unsigned short GBK2UNI(unsigned short usGBK)
{
    unsigned char  szEUC[2] = { usGBK >> 8, usGBK & 0xFF };
    unsigned short usUNI;
    MultiByteToWideChar(       
        936,
        0,
        (LPCSTR)szEUC, 
        2,
        &usUNI,    
        1
    );
    return usUNI;  
}

unsigned short UNI2GBK(unsigned short usUNI)
{
    unsigned char  szGBK[3]={0};
    unsigned short wzUNI[2] = { usUNI, 0 };
    unsigned short usGBK;
    WideCharToMultiByte(
        936,
        0,
        wzUNI, 
        2,
        (LPSTR)szGBK,    
        2,
        0,
        0
    );
    usGBK = (szGBK[0] << 8) | szGBK[1];   
    return usGBK;
}

二 SHIFT-JIS <==> Unicode
unsigned short SJIS2UNI(unsigned short usSJIS)
{
    unsigned char  szEUC[2] = { usSJIS >> 8, usSJIS & 0xFF };
    unsigned short usUNI;
    MultiByteToWideChar(       
        932,
        0,
        (LPCSTR)szEUC, 
        2,
        &usUNI,    
        1
    );
    return usUNI;  
}

unsigned short UNI2SJIS(unsigned short usUNI)
{
    unsigned char  szSJIS[3]  = { 0 };
    unsigned short wzUNI[2] = { usUNI, 0 };
    unsigned short usSJIS;
    WideCharToMultiByte(
        932,
        0,
        wzUNI, 
        2,
        (LPSTR)szSJIS,    
        2,
        0,
        0
    );
    usSJIS = (szSJIS[0] << 8) | szSJIS[1];   
    return usSJIS;
}

 

三  JIS <=> Unicode

unsigned short JIS2UNI(unsigned short usJIS)
{
    unsigned char  szEUC[2] = { (usJIS | 0x8080) >> 8, (usJIS | 0x8080) & 0xFF };
    unsigned short usUNI;
    MultiByteToWideChar(       
        20932,
        0,
        (LPCSTR)szEUC, 
        2,
        &usUNI,    
        1
    );
    return usUNI;  
}
unsigned short UNI2JIS(unsigned short usUNI)
{
    unsigned char  szJIS[3]  = { 0 };
    unsigned short wzUNI[2] = { usUNI, 0 };
    unsigned short usJIS;
    WideCharToMultiByte(
        20932,
        0,
        wzUNI, 
        2,
        (LPSTR)szJIS,    
        2,
        0,
        0
    );
    usJIS = (szJIS[0] << 8) | szJIS[1];   
    return usJIS;
}

 

四  JIS <=> SHIFT-JIS
unsigned short SJIS2JIS( unsigned short sjis )
{
    unsigned short ubyte, lbyte;
   
   
    if (((sjis >= 0x8140) && (sjis <= 0x9ffc)) ||
        ((sjis >= 0xe040) && (sjis <= 0xeffc)) )
    {
        ubyte = sjis >> 8;
        lbyte = sjis & 0x00ff;
       
        if ( (lbyte <= 0x3f) || (lbyte == 0x7f) ||
                (lbyte >= 0xfd) ) return 0;
       
        if ( ubyte >= 0xe0 ) ubyte -= 0xc0; else ubyte -= 0x80;
        ubyte = (ubyte << 1) + 0x1f;
       
        if ( lbyte >= 0x9f )
        {
            ubyte++;
            lbyte -= 0x7e;
        } else {
            if ( lbyte >= 0x80 ) lbyte--;
            lbyte -= 0x1f;
        }
       
        return ( ubyte << 8 ) + lbyte;
       
    } else {
        return 0;
    }
}

unsigned short JIS2SJIS( unsigned short jis )
{
    unsigned short     ubyte, lbyte;
   
   
    ubyte = jis >> 8;
    lbyte = jis & 0x00ff;
   
    lbyte += 0x1f;
    if ( lbyte >= 0x7f ) lbyte++;
    if ( lbyte <= 0x3f ) return 0;
   
    if ( (ubyte & 0x0001) == 0 )
    {
        lbyte = jis & 0x00ff;
        lbyte += 0x7e;
        ubyte--;
        if ( lbyte > 0xfd ) return 0;
    }
   
    ubyte -= 0x1f;
    ubyte = ubyte >> 1;
    ubyte += 0x80;
    if ( ubyte >= 0xa0 ) ubyte += 0x40;
   
    if ( ((ubyte >= 0x81) && (ubyte <= 0x9f)) ||
            ((ubyte >= 0xe0) && (ubyte <= 0xef)) )
    {
        return (ubyte << 8) + lbyte;
    } else {
        return 0;
    }
}

UNI2JIS这个函数好像不太好用,其他的都经过测试,没有问题的。现在我还不知道具体原因,现在我从Unicode转到JIS是分两个步骤的,第一个步骤是先将Unicode转到SHIFT-JIS,然后由SHIFT-JIS转到JIS。如果那位朋友知道什么原因,欢迎在我博客里指点指点。

好了,就这些,希望能给需要的朋友们带来一点方便。

posted on 2008-09-20 22:05 antony.net 阅读(...) 评论(...) 编辑 收藏