tools/utils/base64Utils.js

var hexIn = false;
var hexOut = false;
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64DecodeChars = new Array(
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);

function base64encode(str) {
    var out, i, len;
    var c1, c2, c3;
    var charCode;

    len = str.length;
    i = 0;
    out = "";
    while(i < len) {
    c1 = (hexIn ? str[i++] : str.charCodeAt(i++)) & 0xff;
    if(i == len)
    {
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt((c1 & 0x3) << 4);
        out += "==";
        break;
    }
    c2 = (hexIn ? str[i++] : str.charCodeAt(i++));
    if(i == len)
    {
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
        out += base64EncodeChars.charAt((c2 & 0xF) << 2);
        out += "=";
        break;
    }
    c3 = (hexIn ? str[i++] : str.charCodeAt(i++));
    out += base64EncodeChars.charAt(c1 >> 2);
    out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
    out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
    out += base64EncodeChars.charAt(c3 & 0x3F);
    }
    return out;
}

function base64decode(str) {
    var c1, c2, c3, c4;
    var i, len, out;
    var charCode;

    len = str.length;
    i = 0;
    out = hexOut ? [] : "";
    while(i < len) {
    /* c1 */
    do {
        c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    } while(i < len && c1 == -1);
    if(c1 == -1)
        break;

    /* c2 */
    do {
        c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    } while(i < len && c2 == -1);
    if(c2 == -1)
        break;

    charCode = (c1 << 2) | ((c2 & 0x30) >> 4);
    hexOut ? out.push(charCode) : out += String.fromCharCode(charCode);

    /* c3 */
    do {
        c3 = str.charCodeAt(i++) & 0xff;
        if(c3 == 61)
        return out;
        c3 = base64DecodeChars[c3];
    } while(i < len && c3 == -1);
    if(c3 == -1)
        break;
    charCode = ((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2);
    hexOut ? out.push(charCode) : out += String.fromCharCode(charCode);

    /* c4 */
    do {
        c4 = str.charCodeAt(i++) & 0xff;
        if(c4 == 61)
        return out;
        c4 = base64DecodeChars[c4];
    } while(i < len && c4 == -1);
    if(c4 == -1)
        break;
    charCode = ((c3 & 0x03) << 6) | c4;
    hexOut ? out.push(charCode) : out += String.fromCharCode(charCode);
    }
    return out;
}

function utf16to8(str) {
    var out, i, len, c;
    var charCode;
    out = hexIn ? [] : "";
    len = str.length;
    for(i = 0; i < len; i++) {
    c = hexIn ? str[i] : str.charCodeAt(i);
	if ((c >= 0x0001) && (c <= 0x007F)) {
        hexIn ? out.push(str[i]) : out += str.charAt(i);
    } else if (c > 0x07FF) {
        charCode = (0xE0 | ((c >> 12) & 0x0F)); hexIn ? out.push(charCode) : out += String.fromCharCode(charCode);
        charCode = (0x80 | ((c >>  6) & 0x3F)); hexIn ? out.push(charCode) : out += String.fromCharCode(charCode);
        charCode = (0x80 | ((c >>  0) & 0x3F)); hexIn ? out.push(charCode) : out += String.fromCharCode(charCode);
    } else {
        charCode = (0xC0 | ((c >>  6) & 0x1F)); hexIn ? out.push(charCode) : out += String.fromCharCode(charCode);
        charCode = (0x80 | ((c >>  0) & 0x3F)); hexIn ? out.push(charCode) : out += String.fromCharCode(charCode);
    }
    }
    return out;
}

function utf8to16(str) {
    var out, i, len, c;
    var char2, char3;
    var charCode;

    out = hexOut ? [] : "";
    len = str.length;
    i = 0;
    while(i < len) {
    c = hexOut ? str[i++] : str.charCodeAt(i++);
    switch(c >> 4)
    {
      case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
        // 0xxxxxxx
        hexOut ? out.push(str[i-1]) : out += str.charAt(i-1);
        break;
      case 12: case 13:
        // 110x xxxx   10xx xxxx
        char2 = hexOut ? str[i++] : str.charCodeAt(i++);
        charCode = ((c & 0x1F) << 6) | (char2 & 0x3F); hexOut ? out.push(charCode) : out += String.fromCharCode(charCode);
        break;
      case 14:
        // 1110 xxxx  10xx xxxx  10xx xxxx
        char2 = hexOut ? str[i++] : str.charCodeAt(i++);
        char3 = hexOut ? str[i++] : str.charCodeAt(i++);
        charCode = ((c & 0x0F) << 12) |
                       ((char2 & 0x3F) << 6) |
                       ((char3 & 0x3F) << 0);
        hexOut ? out.push(charCode) : out += String.fromCharCode(charCode);
        break;
    }
    }

    return out;
}

function CharToHex(str) {
    var out, i, len, c, h;
    out = "";
    len = str.length;
    i = 0;
    while(i < len)
    {
	    c = str.charCodeAt(i++);
	    h = c.toString(16);
	    if(h.length < 2)
	    	h = "0" + h;

	    out += "\\x" + h + " ";
	    if(i > 0 && i % 8 == 0)
	    	out += "\r\n";
    }

    return out;
}

function base64_encode(src, hI) {
	hexIn = hI;
	return base64encode(hexIn ? src : utf16to8(src));
}

function base64_decode(src, hO, out_de) {
	hexOut = hO;
	var ret = base64decode(src);
	if(!hexOut || out_de == 'u' || out_de == 'd'){ ret = utf8to16(ret); }
	return ret;
}

module.exports = {
    // base64decode,
    // base64encode,
    base64_encode,
    base64_decode,
}