MFC BASE64加解密 算法

 unsigned char * base64 = (unsigned char *)"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
 
 CString ToolFiles::base64encode(CString src, int srclen)
 {
 int n, buflen, i, j;
 static unsigned char *dst;
 CString buf = src;
 buflen = n = srclen;
 dst = (unsigned char*)malloc(buflen /  *  + );
 memset(dst, , buflen /  *  + );
 for (i = , j = ; i <= buflen - ; i += , j += ) {
 dst[j] = (buf[i] & 0xFC) >> ;
 dst[j + ] = ((buf[i] & 0x03) << ) + ((buf[i + ] & 0xF0) >> );
 dst[j + ] = ((buf[i + ] & 0x0F) << ) + ((buf[i + ] & 0xC0) >> );
 dst[j + ] = buf[i + ] & 0x3F;
 }
 if (n %  == ) {
 dst[j] = (buf[i] & 0xFC) >> ;
 dst[j + ] = ((buf[i] & 0x03) << );
 dst[j + ] = ;
 dst[j + ] = ;
 j += ;
 }
 else if (n %  == ) {
 dst[j] = (buf[i] & 0xFC) >> ;
 dst[j + ] = ((buf[i] & 0x03) << ) + ((buf[i + ] & 0xF0) >> );
 dst[j + ] = ((buf[i + ] & 0x0F) << );
 dst[j + ] = ;
 j += ;
 }
 for (i = ; i < j; i++)
 dst[i] = base64[(int)dst[i]];
 dst[j] = ;
 return CString(dst);
 }
 
 CString ToolFiles::base64decode(CString inpt, int * len)
 {
 int n, i, j, pad;
 unsigned char *p;
 static unsigned char *dst;
 unsigned char * src;
 *len = ;
 pad = ;
 n = inpt.GetLength();
 src = new unsigned char[n];
 for (i = ; i < n; i++)
 src[i] = inpt[i];
 
 while (n> && src[n - ] == '=') {
 src[n - ] = ;
 pad++;
 n--;
 }
 for (i = ; i < n; i++) {
 p = (unsigned char *)strchr((const char *)base64, (int)src[i]);
 if (!p)
 break;
 src[i] = p - (unsigned char *)base64;
 }
 
 dst = (unsigned char *)malloc(n *  /  + );
 memset(dst, , n *  /  + );
 for (i = , j = ; i < n; i += , j += ) {
 dst[j] = (src[i] << ) + ((src[i + ] & 0x30) >> );
 dst[j + ] = ((src[i + ] & 0x0F) << ) + ((src[i + ] & 0x3C) >> );
 dst[j + ] = ((src[i + ] & 0x03) << ) + src[i + ];
 *len += ;
 }
 *len -= pad;
 return CString(dst);
 }

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