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Update npm packages, cleanup the code, cleanup all tslint complain

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Godzil
2017-02-10 17:43:52 +00:00
parent 5d9c25491d
commit bee3f33e20
13 changed files with 751 additions and 389 deletions
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65
src/subtitle/decode.ts
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@@ -7,10 +7,14 @@ import zlib = require('zlib');
/**
* Decodes the data.
*/
export default function(id: number, iv: Buffer|string, data: Buffer|string, done: (err?: Error, result?: Buffer) => void) {
try {
export default function(id: number, iv: Buffer|string, data: Buffer|string,
done: (err?: Error, result?: Buffer) => void)
{
try
{
decompress(decrypt(id, iv, data), done);
} catch (e) {
} catch (e)
{
done(e);
}
}
@@ -18,21 +22,27 @@ import zlib = require('zlib');
/**
* Decrypts the data.
*/
function decrypt(id: number, iv: Buffer|string, data: Buffer|string) {
var ivBuffer = typeof iv === 'string' ? new Buffer(iv, 'base64') : iv;
var dataBuffer = typeof data === 'string' ? new Buffer(data, 'base64') : data;
var decipher = crypto.createDecipheriv('aes-256-cbc', key(id), ivBuffer);
function decrypt(id: number, iv: Buffer|string, data: Buffer|string)
{
const ivBuffer = typeof iv === 'string' ? new Buffer(iv, 'base64') : iv;
const dataBuffer = typeof data === 'string' ? new Buffer(data, 'base64') : data;
const decipher = crypto.createDecipheriv('aes-256-cbc', key(id), ivBuffer);
decipher.setAutoPadding(false);
return Buffer.concat([decipher.update(dataBuffer), decipher.final()]);
}
/**
* Decompresses the data.
*/
function decompress(data: Buffer, done: (err: Error, result?: Buffer) => void) {
try {
function decompress(data: Buffer, done: (err: Error, result?: Buffer) => void)
{
try
{
zlib.inflate(data, done);
} catch (e) {
} catch (e)
{
done(null, data);
}
}
@@ -40,36 +50,45 @@ function decompress(data: Buffer, done: (err: Error, result?: Buffer) => void) {
/**
* Generates a key.
*/
function key(subtitleId: number): Buffer {
var hash = secret(20, 97, 1, 2) + magic(subtitleId);
var result = new Buffer(32);
function key(subtitleId: number): Buffer
{
const hash = secret(20, 97, 1, 2) + magic(subtitleId);
const result = new Buffer(32);
result.fill(0);
crypto.createHash('sha1').update(hash).digest().copy(result);
return result;
}
/**
* Generates a magic number.
*/
function magic(subtitleId: number): number {
var base = Math.floor(Math.sqrt(6.9) * Math.pow(2, 25));
var hash = bigInt(base).xor(subtitleId).toJSNumber();
var multipliedHash = bigInt(hash).multiply(32).toJSNumber();
function magic(subtitleId: number): number
{
const base = Math.floor(Math.sqrt(6.9) * Math.pow(2, 25));
const hash = bigInt(base).xor(subtitleId).toJSNumber();
const multipliedHash = bigInt(hash).multiply(32).toJSNumber();
return bigInt(hash).xor(hash >> 3).xor(multipliedHash).toJSNumber();
}
/**
* Generates a secret string based on a Fibonacci sequence.
*/
function secret(size: number, modulo: number, firstSeed: number, secondSeed: number): string {
var currentValue = firstSeed + secondSeed;
var previousValue = secondSeed;
var result = '';
for (var i = 0; i < size; i += 1) {
var oldValue = currentValue;
function secret(size: number, modulo: number, firstSeed: number, secondSeed: number): string
{
let currentValue = firstSeed + secondSeed;
let previousValue = secondSeed;
let result = '';
for (let i = 0; i < size; i += 1)
{
const oldValue = currentValue;
result += String.fromCharCode(currentValue % modulo + 33);
currentValue += previousValue;
previousValue = oldValue;
}
return result;
}