Merge branch 'PenguinGeorge-ascii85-new'
n1474335
commit
4c2d612bdd
|
|
@ -25,6 +25,8 @@
|
|||
"From Base32",
|
||||
"To Base58",
|
||||
"From Base58",
|
||||
"To Base85",
|
||||
"From Base85",
|
||||
"To Base",
|
||||
"From Base",
|
||||
"To BCD",
|
||||
|
|
|
|||
|
|
@ -0,0 +1,45 @@
|
|||
/**
|
||||
* Base85 resources.
|
||||
*
|
||||
* @author PenguinGeorge [george@penguingeorge.com]
|
||||
* @copyright Crown Copyright 2018
|
||||
* @license Apache-2.0
|
||||
*/
|
||||
|
||||
/**
|
||||
* Base85 alphabet options.
|
||||
*/
|
||||
export const ALPHABET_OPTIONS = [
|
||||
{
|
||||
name: "Standard",
|
||||
value: "!-u",
|
||||
},
|
||||
{
|
||||
name: "Z85 (ZeroMQ)",
|
||||
value: "0-9a-zA-Z.#\\-:+=^!/*?&<>()[]{}@%$#",
|
||||
},
|
||||
{
|
||||
name: "IPv6",
|
||||
value: "0-9A-Za-z!#$%&()*+\\-;<=>?@^_`{|~}",
|
||||
}
|
||||
];
|
||||
|
||||
|
||||
/**
|
||||
* Returns the name of the alphabet, when given the alphabet.
|
||||
*
|
||||
* @param {string} alphabet
|
||||
* @returns {string}
|
||||
*/
|
||||
export function alphabetName(alphabet) {
|
||||
alphabet = alphabet.replace("'", "'");
|
||||
alphabet = alphabet.replace("\"", """);
|
||||
alphabet = alphabet.replace("\\", "\");
|
||||
let name;
|
||||
|
||||
ALPHABET_OPTIONS.forEach(function(a) {
|
||||
if (escape(alphabet) === escape(a.value)) name = a.name;
|
||||
});
|
||||
|
||||
return name;
|
||||
}
|
||||
|
|
@ -0,0 +1,105 @@
|
|||
/**
|
||||
* @author PenguinGeorge [george@penguingeorge.com]
|
||||
* @copyright Crown Copyright 2018
|
||||
* @license Apache-2.0
|
||||
*/
|
||||
|
||||
import Operation from "../Operation";
|
||||
import OperationError from "../errors/OperationError";
|
||||
import Utils from "../Utils";
|
||||
import {alphabetName, ALPHABET_OPTIONS} from "../lib/Base85";
|
||||
|
||||
/**
|
||||
* From Base85 operation
|
||||
*/
|
||||
class FromBase85 extends Operation {
|
||||
|
||||
/**
|
||||
* From Base85 constructor
|
||||
*/
|
||||
constructor() {
|
||||
super();
|
||||
|
||||
this.name = "From Base85";
|
||||
this.module = "Default";
|
||||
this.description = "Base85 (also called Ascii85) is a notation for encoding arbitrary byte data. It is usually more efficient that Base64.<br><br>This operation decodes data from an ASCII string (with an alphabet of your choosing, presets included).<br><br>e.g. <code>BOu!rD]j7BEbo7</code> becomes <code>hello world</code><br><br>Base85 is commonly used in Adobe's PostScript and PDF file formats.";
|
||||
this.infoURL = "https://wikipedia.org/wiki/Ascii85";
|
||||
this.inputType = "string";
|
||||
this.outputType = "byteArray";
|
||||
this.args = [
|
||||
{
|
||||
name: "Alphabet",
|
||||
type: "editableOption",
|
||||
value: ALPHABET_OPTIONS
|
||||
},
|
||||
];
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {string} input
|
||||
* @param {Object[]} args
|
||||
* @returns {byteArray}
|
||||
*/
|
||||
run(input, args) {
|
||||
const alphabet = Utils.expandAlphRange(args[0]).join(""),
|
||||
encoding = alphabetName(alphabet),
|
||||
result = [];
|
||||
|
||||
if (alphabet.length !== 85 ||
|
||||
[].unique.call(alphabet).length !== 85) {
|
||||
throw new OperationError("Alphabet must be of length 85");
|
||||
}
|
||||
|
||||
if (input.length === 0) return [];
|
||||
|
||||
const matches = input.match(/<~(.+?)~>/);
|
||||
if (matches !== null) input = matches[1];
|
||||
|
||||
let i = 0;
|
||||
let block, blockBytes;
|
||||
while (i < input.length) {
|
||||
if (encoding === "Standard" && input[i] === "z") {
|
||||
result.push(0, 0, 0, 0);
|
||||
i++;
|
||||
} else {
|
||||
let digits = [];
|
||||
digits = input
|
||||
.substr(i, 5)
|
||||
.split("")
|
||||
.map((chr, idx) => {
|
||||
const digit = alphabet.indexOf(chr);
|
||||
if (digit < 0 || digit > 84) {
|
||||
throw `Invalid character '${chr}' at index ${idx}`;
|
||||
}
|
||||
return digit;
|
||||
});
|
||||
|
||||
block =
|
||||
digits[0] * 52200625 +
|
||||
digits[1] * 614125 +
|
||||
(i + 2 < input.length ? digits[2] : 84) * 7225 +
|
||||
(i + 3 < input.length ? digits[3] : 84) * 85 +
|
||||
(i + 4 < input.length ? digits[4] : 84);
|
||||
|
||||
blockBytes = [
|
||||
(block >> 24) & 0xff,
|
||||
(block >> 16) & 0xff,
|
||||
(block >> 8) & 0xff,
|
||||
block & 0xff
|
||||
];
|
||||
|
||||
if (input.length < i + 5) {
|
||||
blockBytes.splice(input.length - (i + 5), 5);
|
||||
}
|
||||
|
||||
result.push.apply(result, blockBytes);
|
||||
i += 5;
|
||||
}
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
export default FromBase85;
|
||||
|
|
@ -0,0 +1,93 @@
|
|||
/**
|
||||
* @author PenguinGeorge [george@penguingeorge.com]
|
||||
* @copyright Crown Copyright 2018
|
||||
* @license Apache-2.0
|
||||
*/
|
||||
|
||||
import Operation from "../Operation";
|
||||
import OperationError from "../errors/OperationError";
|
||||
import Utils from "../Utils";
|
||||
import {alphabetName, ALPHABET_OPTIONS} from "../lib/Base85";
|
||||
|
||||
/**
|
||||
* To Base85 operation
|
||||
*/
|
||||
class ToBase85 extends Operation {
|
||||
|
||||
/**
|
||||
* To Base85 constructor
|
||||
*/
|
||||
constructor() {
|
||||
super();
|
||||
|
||||
this.name = "To Base85";
|
||||
this.module = "Default";
|
||||
this.description = "Base85 (also called Ascii85) is a notation for encoding arbitrary byte data. It is usually more efficient that Base64.<br><br>This operation encodes data in an ASCII string (with an alphabet of your choosing, presets included).<br><br>e.g. <code>hello world</code> becomes <code>BOu!rD]j7BEbo7</code><br><br>Base85 is commonly used in Adobe's PostScript and PDF file formats.<br><br><strong>Options</strong><br><u>Alphabet</u><ul><li>Standard - The standard alphabet, referred to as Ascii85</li><li>Z85 (ZeroMQ) - A string-safe variant of Base85, which avoids quote marks and backslash characters</li><li>IPv6 - A variant of Base85 suitable for encoding IPv6 addresses (RFC 1924)</li></ul><u>Include delimiter</u><br>Adds a '<~' and '~>' delimiter to the start and end of the data. This is standard for Adobe's implementation of Base85.";
|
||||
this.infoURL = "https://wikipedia.org/wiki/Ascii85";
|
||||
this.inputType = "byteArray";
|
||||
this.outputType = "string";
|
||||
this.args = [
|
||||
{
|
||||
name: "Alphabet",
|
||||
type: "editableOption",
|
||||
value: ALPHABET_OPTIONS
|
||||
},
|
||||
{
|
||||
name: "Include delimeter",
|
||||
type: "boolean",
|
||||
value: false
|
||||
}
|
||||
];
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {byteArray} input
|
||||
* @param {Object[]} args
|
||||
* @returns {string}
|
||||
*/
|
||||
run(input, args) {
|
||||
const alphabet = Utils.expandAlphRange(args[0]).join(""),
|
||||
encoding = alphabetName(alphabet),
|
||||
includeDelim = args[1];
|
||||
let result = "";
|
||||
|
||||
if (alphabet.length !== 85 ||
|
||||
[].unique.call(alphabet).length !== 85) {
|
||||
throw new OperationError("Error: Alphabet must be of length 85");
|
||||
}
|
||||
|
||||
if (input.length === 0) return "";
|
||||
|
||||
let block;
|
||||
for (let i = 0; i < input.length; i += 4) {
|
||||
block = (
|
||||
((input[i]) << 24) +
|
||||
((input[i + 1] || 0) << 16) +
|
||||
((input[i + 2] || 0) << 8) +
|
||||
((input[i + 3] || 0))
|
||||
) >>> 0;
|
||||
|
||||
if (encoding !== "Standard" || block > 0) {
|
||||
let digits = [];
|
||||
for (let j = 0; j < 5; j++) {
|
||||
digits.push(block % 85);
|
||||
block = Math.floor(block / 85);
|
||||
}
|
||||
|
||||
digits = digits.reverse();
|
||||
|
||||
if (input.length < i + 4) {
|
||||
digits.splice(input.length - (i + 4), 4);
|
||||
}
|
||||
|
||||
result += digits.map(digit => alphabet[digit]).join("");
|
||||
} else {
|
||||
result += (encoding === "Standard") ? "z" : null;
|
||||
}
|
||||
}
|
||||
|
||||
return includeDelim ? `<~${result}~>` : result;
|
||||
}
|
||||
}
|
||||
|
||||
export default ToBase85;
|
||||
Loading…
Reference in New Issue