250 lines
7.6 KiB
TypeScript
250 lines
7.6 KiB
TypeScript
import { describe, it } from 'mocha'
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import { expect } from 'chai'
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import {
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buffersEqual,
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cloneBuffer,
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encodeUrlSafeBase64,
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parseUrlSafeBase64,
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randomBytes,
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telegramRleDecode,
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telegramRleEncode,
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xorBuffer,
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xorBufferInPlace,
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} from '../src/utils/buffer-utils'
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describe('buffersEqual', () => {
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it('should return true for equal buffers', () => {
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expect(buffersEqual(Buffer.from([]), Buffer.from([]))).is.true
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expect(buffersEqual(Buffer.from([1, 2, 3]), Buffer.from([1, 2, 3]))).is
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.true
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})
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it('should return false for non-equal buffers', () => {
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expect(buffersEqual(Buffer.from([1]), Buffer.from([]))).is.false
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expect(buffersEqual(Buffer.from([1, 2, 3]), Buffer.from([1, 2, 4]))).is
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.false
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})
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})
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describe('xorBuffer', () => {
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it('should xor buffers without modifying original', () => {
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const data = Buffer.from('hello')
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const key = Buffer.from('xor')
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const xored = xorBuffer(data, key)
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expect(data.toString()).eq('hello')
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expect(key.toString()).eq('xor')
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expect(xored.toString('hex')).eq('100a1e6c6f')
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})
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it('should be deterministic', () => {
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const data = Buffer.from('hello')
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const key = Buffer.from('xor')
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const xored1 = xorBuffer(data, key)
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expect(xored1.toString('hex')).eq('100a1e6c6f')
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const xored2 = xorBuffer(data, key)
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expect(xored2.toString('hex')).eq('100a1e6c6f')
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})
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it('second call should decode content', () => {
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const data = Buffer.from('hello')
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const key = Buffer.from('xor')
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const xored1 = xorBuffer(data, key)
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expect(xored1.toString('hex')).eq('100a1e6c6f')
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const xored2 = xorBuffer(xored1, key)
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expect(xored2.toString()).eq('hello')
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})
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})
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describe('xorBufferInPlace', () => {
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it('should xor buffers by modifying original', () => {
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const data = Buffer.from('hello')
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const key = Buffer.from('xor')
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xorBufferInPlace(data, key)
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expect(data.toString('hex')).eq('100a1e6c6f')
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expect(key.toString()).eq('xor')
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})
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it('second call should decode content', () => {
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const data = Buffer.from('hello')
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const key = Buffer.from('xor')
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xorBufferInPlace(data, key)
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expect(data.toString('hex')).eq('100a1e6c6f')
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xorBufferInPlace(data, key)
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expect(data.toString()).eq('hello')
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})
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})
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describe('randomBytes', () => {
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it('should return exactly N bytes', () => {
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expect(randomBytes(0).length).eq(0)
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expect(randomBytes(5).length).eq(5)
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expect(randomBytes(10).length).eq(10)
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expect(randomBytes(256).length).eq(256)
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})
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it('should not be deterministic', () => {
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expect([...randomBytes(8)]).not.eql([...randomBytes(8)])
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})
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})
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describe('cloneBuffer', () => {
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it('should clone buffer', () => {
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const orig = Buffer.from([1, 2, 3])
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const copy = cloneBuffer(orig)
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expect([...copy]).eql([1, 2, 3])
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orig[0] = 0xff
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expect(copy[0]).not.eql(0xff)
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})
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it('should clone buffer partially', () => {
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const orig = Buffer.from([1, 2, 3, 4, 5])
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const copy = cloneBuffer(orig, 1, 4)
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expect([...copy]).eql([2, 3, 4])
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orig[0] = 0xff
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expect(copy[0]).not.eql(0xff)
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})
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})
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describe('parseUrlSafeBase64', () => {
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it('should parse url-safe base64', () => {
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expect(parseUrlSafeBase64('qu7d8aGTeuF6-g').toString('hex')).eq(
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'aaeeddf1a1937ae17afa'
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)
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})
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it('should parse normal base64', () => {
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expect(parseUrlSafeBase64('qu7d8aGTeuF6+g==').toString('hex')).eq(
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'aaeeddf1a1937ae17afa'
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)
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})
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})
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describe('encodeUrlSafeBase64', () => {
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it('should encode to url-safe base64', () => {
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expect(
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encodeUrlSafeBase64(Buffer.from('aaeeddf1a1937ae17afa', 'hex'))
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).eq('qu7d8aGTeuF6-g')
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})
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})
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describe('telegramRleEncode', () => {
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it('should not modify input if there are no \\x00', () => {
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expect(
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telegramRleEncode(Buffer.from('aaeeff', 'hex')).toString('hex')
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).eq('aaeeff')
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})
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it('should collapse consecutive \\x00', () => {
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expect(
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telegramRleEncode(Buffer.from('00000000aa', 'hex')).toString('hex')
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).eq('0004aa')
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expect(
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telegramRleEncode(
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Buffer.from('00000000aa000000aa', 'hex')
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).toString('hex')
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).eq('0004aa0003aa')
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expect(
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telegramRleEncode(Buffer.from('00000000aa0000', 'hex')).toString(
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'hex'
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)
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).eq('0004aa0002')
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expect(
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telegramRleEncode(Buffer.from('00aa00', 'hex')).toString('hex')
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).eq('0001aa0001')
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})
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})
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describe('telegramRleDecode', () => {
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it('should not mofify input if there are no \\x00', () => {
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expect(
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telegramRleDecode(Buffer.from('aaeeff', 'hex')).toString('hex')
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).eq('aaeeff')
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})
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it('should expand two-byte sequences starting with \\x00', () => {
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expect(
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telegramRleDecode(Buffer.from('0004aa', 'hex')).toString('hex')
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).eq('00000000aa')
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expect(
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telegramRleDecode(Buffer.from('0004aa0000', 'hex')).toString('hex')
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).eq('00000000aa')
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expect(
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telegramRleDecode(Buffer.from('0004aa0003aa', 'hex')).toString(
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'hex'
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)
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).eq('00000000aa000000aa')
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expect(
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telegramRleDecode(Buffer.from('0004aa0002', 'hex')).toString('hex')
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).eq('00000000aa0000')
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expect(
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telegramRleDecode(Buffer.from('0001aa0001', 'hex')).toString('hex')
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).eq('00aa00')
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})
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})
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// describe('isProbablyPlainText', () => {
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// it('should return true for buffers only containing printable ascii', () => {
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// expect(
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// isProbablyPlainText(Buffer.from('hello this is some ascii text'))
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// ).to.be.true
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// expect(
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// isProbablyPlainText(
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// Buffer.from(
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// 'hello this is some ascii text\nwith unix new lines'
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// )
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// )
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// ).to.be.true
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// expect(
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// isProbablyPlainText(
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// Buffer.from(
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// 'hello this is some ascii text\r\nwith windows new lines'
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// )
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// )
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// ).to.be.true
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// expect(
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// isProbablyPlainText(
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// Buffer.from(
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// 'hello this is some ascii text\n\twith unix new lines and tabs'
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// )
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// )
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// ).to.be.true
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// expect(
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// isProbablyPlainText(
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// Buffer.from(
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// 'hello this is some ascii text\r\n\twith windows new lines and tabs'
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// )
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// )
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// ).to.be.true
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// })
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//
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// it('should return false for buffers containing some binary data', () => {
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// expect(isProbablyPlainText(Buffer.from('hello this is cedilla: ç'))).to
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// .be.false
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// expect(
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// isProbablyPlainText(
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// Buffer.from('hello this is some ascii text with emojis 🌸')
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// )
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// ).to.be.false
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//
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// // random strings of 16 bytes
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// expect(
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// isProbablyPlainText(
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// Buffer.from('717f80f08eb9d88c3931712c0e2be32f', 'hex')
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// )
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// ).to.be.false
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// expect(
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// isProbablyPlainText(
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// Buffer.from('20e8e218e54254c813b261432b0330d7', 'hex')
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// )
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// ).to.be.false
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// })
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// })
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