import Utils from "../Utils.js";
/**
* Base64 operations.
*
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*
* @namespace
*/
const Base64 = {
/**
* @constant
* @default
*/
ALPHABET: "A-Za-z0-9+/=",
/**
* @constant
* @default
*/
ALPHABET_OPTIONS: [
{name: "Standard: A-Za-z0-9+/=", value: "A-Za-z0-9+/="},
{name: "URL safe: A-Za-z0-9-_", value: "A-Za-z0-9-_"},
{name: "Filename safe: A-Za-z0-9+-=", value: "A-Za-z0-9+\\-="},
{name: "itoa64: ./0-9A-Za-z=", value: "./0-9A-Za-z="},
{name: "XML: A-Za-z0-9_.", value: "A-Za-z0-9_."},
{name: "y64: A-Za-z0-9._-", value: "A-Za-z0-9._-"},
{name: "z64: 0-9a-zA-Z+/=", value: "0-9a-zA-Z+/="},
{name: "Radix-64: 0-9A-Za-z+/=", value: "0-9A-Za-z+/="},
{name: "Uuencoding: [space]-_", value: " -_"},
{name: "Xxencoding: +-0-9A-Za-z", value: "+\\-0-9A-Za-z"},
{name: "BinHex: !-,-0-689@A-NP-VX-Z[`a-fh-mp-r", value: "!-,-0-689@A-NP-VX-Z[`a-fh-mp-r"},
{name: "ROT13: N-ZA-Mn-za-m0-9+/=", value: "N-ZA-Mn-za-m0-9+/="},
{name: "UNIX crypt: ./0-9A-Za-z", value: "./0-9A-Za-z"},
],
/**
* To Base64 operation.
*
* @param {byteArray} input
* @param {Object[]} args
* @returns {string}
*/
runTo: function(input, args) {
const alphabet = args[0] || Base64.ALPHABET;
return Utils.toBase64(input, alphabet);
},
/**
* @constant
* @default
*/
REMOVE_NON_ALPH_CHARS: true,
/**
* From Base64 operation.
*
* @param {string} input
* @param {Object[]} args
* @returns {byteArray}
*/
runFrom: function(input, args) {
let alphabet = args[0] || Base64.ALPHABET,
removeNonAlphChars = args[1];
return Utils.fromBase64(input, alphabet, "byteArray", removeNonAlphChars);
},
/**
* @constant
* @default
*/
BASE32_ALPHABET: "A-Z2-7=",
/**
* To Base32 operation.
*
* @param {byteArray} input
* @param {Object[]} args
* @returns {string}
*/
runTo32: function(input, args) {
if (!input) return "";
let alphabet = args[0] ?
Utils.expandAlphRange(args[0]).join("") : "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=",
output = "",
chr1, chr2, chr3, chr4, chr5,
enc1, enc2, enc3, enc4, enc5, enc6, enc7, enc8,
i = 0;
while (i < input.length) {
chr1 = input[i++];
chr2 = input[i++];
chr3 = input[i++];
chr4 = input[i++];
chr5 = input[i++];
enc1 = chr1 >> 3;
enc2 = ((chr1 & 7) << 2) | (chr2 >> 6);
enc3 = (chr2 >> 1) & 31;
enc4 = ((chr2 & 1) << 4) | (chr3 >> 4);
enc5 = ((chr3 & 15) << 1) | (chr4 >> 7);
enc6 = (chr4 >> 2) & 31;
enc7 = ((chr4 & 3) << 3) | (chr5 >> 5);
enc8 = chr5 & 31;
if (isNaN(chr2)) {
enc3 = enc4 = enc5 = enc6 = enc7 = enc8 = 32;
} else if (isNaN(chr3)) {
enc5 = enc6 = enc7 = enc8 = 32;
} else if (isNaN(chr4)) {
enc6 = enc7 = enc8 = 32;
} else if (isNaN(chr5)) {
enc8 = 32;
}
output += alphabet.charAt(enc1) + alphabet.charAt(enc2) + alphabet.charAt(enc3) +
alphabet.charAt(enc4) + alphabet.charAt(enc5) + alphabet.charAt(enc6) +
alphabet.charAt(enc7) + alphabet.charAt(enc8);
}
return output;
},
/**
* From Base32 operation.
*
* @param {string} input
* @param {Object[]} args
* @returns {byteArray}
*/
runFrom32: function(input, args) {
if (!input) return [];
let alphabet = args[0] ?
Utils.expandAlphRange(args[0]).join("") : "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=",
removeNonAlphChars = args[0];
let output = [],
chr1, chr2, chr3, chr4, chr5,
enc1, enc2, enc3, enc4, enc5, enc6, enc7, enc8,
i = 0;
if (removeNonAlphChars) {
const re = new RegExp("[^" + alphabet.replace(/[\]\\\-^]/g, "\\$&") + "]", "g");
input = input.replace(re, "");
}
while (i < input.length) {
enc1 = alphabet.indexOf(input.charAt(i++));
enc2 = alphabet.indexOf(input.charAt(i++) || "=");
enc3 = alphabet.indexOf(input.charAt(i++) || "=");
enc4 = alphabet.indexOf(input.charAt(i++) || "=");
enc5 = alphabet.indexOf(input.charAt(i++) || "=");
enc6 = alphabet.indexOf(input.charAt(i++) || "=");
enc7 = alphabet.indexOf(input.charAt(i++) || "=");
enc8 = alphabet.indexOf(input.charAt(i++) || "=");
chr1 = (enc1 << 3) | (enc2 >> 2);
chr2 = ((enc2 & 3) << 6) | (enc3 << 1) | (enc4 >> 4);
chr3 = ((enc4 & 15) << 4) | (enc5 >> 1);
chr4 = ((enc5 & 1) << 7) | (enc6 << 2) | (enc7 >> 3);
chr5 = ((enc7 & 7) << 5) | enc8;
output.push(chr1);
if (enc2 & 3 !== 0 || enc3 !== 32) output.push(chr2);
if (enc4 & 15 !== 0 || enc5 !== 32) output.push(chr3);
if (enc5 & 1 !== 0 || enc6 !== 32) output.push(chr4);
if (enc7 & 7 !== 0 || enc8 !== 32) output.push(chr5);
}
return output;
},
/**
* @constant
* @default
*/
SHOW_IN_BINARY: false,
/**
* @constant
* @default
*/
OFFSETS_SHOW_VARIABLE: true,
/**
* Show Base64 offsets operation.
*
* @param {byteArray} input
* @param {Object[]} args
* @returns {html}
*/
runOffsets: function(input, args) {
let alphabet = args[0] || Base64.ALPHABET,
showVariable = args[1],
offset0 = Utils.toBase64(input, alphabet),
offset1 = Utils.toBase64([0].concat(input), alphabet),
offset2 = Utils.toBase64([0, 0].concat(input), alphabet),
len0 = offset0.indexOf("="),
len1 = offset1.indexOf("="),
len2 = offset2.indexOf("="),
script = "",
staticSection = "",
padding = "";
if (input.length < 1) {
return "Please enter a string.";
}
// Highlight offset 0
if (len0 % 4 === 2) {
staticSection = offset0.slice(0, -3);
offset0 = "" +
staticSection + "" +
"" + offset0.substr(offset0.length - 3, 1) + "" +
"" + offset0.substr(offset0.length - 2) + "";
} else if (len0 % 4 === 3) {
staticSection = offset0.slice(0, -2);
offset0 = "" +
staticSection + "" +
"" + offset0.substr(offset0.length - 2, 1) + "" +
"" + offset0.substr(offset0.length - 1) + "";
} else {
staticSection = offset0;
offset0 = "" +
staticSection + "";
}
if (!showVariable) {
offset0 = staticSection;
}
// Highlight offset 1
padding = "" + offset1.substr(0, 1) + "" +
"" + offset1.substr(1, 1) + "";
offset1 = offset1.substr(2);
if (len1 % 4 === 2) {
staticSection = offset1.slice(0, -3);
offset1 = padding + "" +
staticSection + "" +
"" + offset1.substr(offset1.length - 3, 1) + "" +
"" + offset1.substr(offset1.length - 2) + "";
} else if (len1 % 4 === 3) {
staticSection = offset1.slice(0, -2);
offset1 = padding + "" +
staticSection + "" +
"" + offset1.substr(offset1.length - 2, 1) + "" +
"" + offset1.substr(offset1.length - 1) + "";
} else {
staticSection = offset1;
offset1 = padding + "" +
staticSection + "";
}
if (!showVariable) {
offset1 = staticSection;
}
// Highlight offset 2
padding = "" + offset2.substr(0, 2) + "" +
"" + offset2.substr(2, 1) + "";
offset2 = offset2.substr(3);
if (len2 % 4 === 2) {
staticSection = offset2.slice(0, -3);
offset2 = padding + "" +
staticSection + "" +
"" + offset2.substr(offset2.length - 3, 1) + "" +
"" + offset2.substr(offset2.length - 2) + "";
} else if (len2 % 4 === 3) {
staticSection = offset2.slice(0, -2);
offset2 = padding + "" +
staticSection + "" +
"" + offset2.substr(offset2.length - 2, 1) + "" +
"" + offset2.substr(offset2.length - 1) + "";
} else {
staticSection = offset2;
offset2 = padding + "" +
staticSection + "";
}
if (!showVariable) {
offset2 = staticSection;
}
return (showVariable ? "Characters highlighted in green could change if the input is surrounded by more data." +
"\nCharacters highlighted in red are for padding purposes only." +
"\nUnhighlighted characters are static." +
"\nHover over the static sections to see what they decode to on their own.\n" +
"\nOffset 0: " + offset0 +
"\nOffset 1: " + offset1 +
"\nOffset 2: " + offset2 +
script :
offset0 + "\n" + offset1 + "\n" + offset2);
},
/**
* Highlight to Base64
*
* @param {Object[]} pos
* @param {number} pos[].start
* @param {number} pos[].end
* @param {Object[]} args
* @returns {Object[]} pos
*/
highlightTo: function(pos, args) {
pos[0].start = Math.floor(pos[0].start / 3 * 4);
pos[0].end = Math.ceil(pos[0].end / 3 * 4);
return pos;
},
/**
* Highlight from Base64
*
* @param {Object[]} pos
* @param {number} pos[].start
* @param {number} pos[].end
* @param {Object[]} args
* @returns {Object[]} pos
*/
highlightFrom: function(pos, args) {
pos[0].start = Math.ceil(pos[0].start / 4 * 3);
pos[0].end = Math.floor(pos[0].end / 4 * 3);
return pos;
},
};
export default Base64;