Remove Buffer to make the package smaller and run faster in the bro…

…wser (#145)

README.md

@@ -226,7 +226,7 @@ This section describes the structure of the object returned by `parse()` method.
 | ----------------- | -------- | -------- | --------- | ------------- |
 | `method` | string | Yes | N/A | See METHOD attribute in [EXT-X-KEY](https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-4.3.2.4) |
 | `uri` | string | No | undefined | See URI attribute in [EXT-X-KEY](https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-4.3.2.4) |
-| `iv` | `Buffer`(length=16) | No | undefined | See IV attribute in [EXT-X-KEY](https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-4.3.2.4) |
+| `iv` | `ArrayBuffer`(length=16) | No | undefined | See IV attribute in [EXT-X-KEY](https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-4.3.2.4) |
 | `format` | string | No | undefined | See KEYFORMAT attribute in [EXT-X-KEY](https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-4.3.2.4) |
 | `formatVersion` | string | No | undefined | See KEYFORMATVERSIONS attribute in [EXT-X-KEY](https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-4.3.2.4) |
 

package.json

@@ -69,15 +69,13 @@
  "import/extensions": 0,
  "import/no-dynamic-require": 0,
  "new-cap": 0,
- "node/prefer-global/buffer": 0,
  "no-bitwise": 0,
  "no-cond-assign": 0,
  "no-mixed-operators": 0,
  "no-multi-assign": 0,
  "no-use-extend-native/no-use-extend-native": 0,
  "object-curly-newline": 0,
  "operator-linebreak": 0,
- "n/prefer-global/buffer": 0,
  "padding-line-between-statements": 0,
  "quotes": 0,
  "unicorn/catch-error-name": 0,

parse.ts

@@ -104,7 +104,7 @@ function parseAllowedCpc(str: string) {
  return allowedCpcList;
 }
 
-function parseIV(str: string): Buffer {
+function parseIV(str: string): Uint8Array {
  const iv = utils.hexToByteSequence(str);
  if (iv.length !== 16) {
  utils.INVALIDPLAYLIST('IV must be a 128-bit unsigned integer');
@@ -373,10 +373,10 @@ function sameKey(key1: Key, key2: Key) {
  if (!key2.iv) {
  return false;
  }
- if (key1.iv.length !== key2.iv.length) {
+ if (key1.iv.byteLength !== key2.iv.byteLength) {
  return false;
  }
- for (let i = 0; i < key1.iv.length; i++) {
+ for (let i = 0; i < key1.iv.byteLength; i++) {
  if (key1.iv[i] !== key2.iv[i]) {
  return false;
  }
@@ -962,7 +962,7 @@ function lexicalParse(text: string, params: Record<string, any>) {
  // V8 has garbage collection issues when cleaning up substrings split from strings greater
  // than 13 characters so before we continue we need to safely copy over each line so that it
  // doesn't hold any reference to the containing string.
- const line = Buffer.from(l.trim()).toString();
+ const line = l.trim();
  if (!line) {
  // empty line
  continue;

stringify.ts

@@ -109,7 +109,7 @@ function buildKey(key: Key, isSessionKey?: any) {
  attrs.push(`URI="${key.uri}"`);
  }
  if (key.iv) {
- if (key.iv.length !== 16) {
+ if (key.iv.byteLength !== 16) {
  utils.INVALIDPLAYLIST('IV must be a 128-bit unsigned integer');
  }
  attrs.push(`IV=${utils.byteSequenceToHex(key.iv)}`);

test/spec/4_Playlists/4.3_Playlist-Tags/4.3.2_Media-Segment-Tags/4.3.2.7_EXT-X-DATERANGE.spec.js

@@ -138,7 +138,7 @@ test('#EXT-X-DATERANGE_06', t => {
  http://example.com/3
  `);
  t.is(playlist.segments[0].dateRange.attributes['X-STR'], 'abc');
- t.deepEqual(playlist.segments[1].dateRange.attributes['X-BYTE'], Buffer.from([255, 254, 253, 252]));
+ t.deepEqual(playlist.segments[1].dateRange.attributes['X-BYTE'], new Uint8Array([255, 254, 253, 252]));
  t.is(playlist.segments[2].dateRange.attributes['X-FLOAT'], 0.999);
 });
 

test/spec/utils.spec.js

@@ -63,15 +63,15 @@ test('utils.toNumber', t => {
 });
 
 test('utils.hexToByteSequence', t => {
- t.deepEqual(utils.hexToByteSequence('0x000000'), Buffer.from([0, 0, 0]));
- t.deepEqual(utils.hexToByteSequence('0xFFFFFF'), Buffer.from([255, 255, 255]));
- t.deepEqual(utils.hexToByteSequence('FFFFFF'), Buffer.from([255, 255, 255]));
+ t.deepEqual(utils.hexToByteSequence('0x000000'), new Uint8Array([0, 0, 0]));
+ t.deepEqual(utils.hexToByteSequence('0xFFFFFF'), new Uint8Array([255, 255, 255]));
+ t.deepEqual(utils.hexToByteSequence('FFFFFF'), new Uint8Array([255, 255, 255]));
 });
 
 test('utils.byteSequenceToHex', t => {
- t.is(utils.byteSequenceToHex(Buffer.from([0, 0, 0])), '0x000000');
- t.is(utils.byteSequenceToHex(Buffer.from([255, 255, 255])), '0xFFFFFF');
- t.is(utils.byteSequenceToHex(Buffer.from([255, 255, 256])), '0xFFFF00');
+ t.is(utils.byteSequenceToHex(new Uint8Array([0, 0, 0])), '0x000000');
+ t.is(utils.byteSequenceToHex(new Uint8Array([255, 255, 255])), '0xFFFFFF');
+ t.is(utils.byteSequenceToHex(new Uint8Array([255, 255, 256])), '0xFFFF00');
 });
 
 test('utils.tryCatch', t => {

types.ts

@@ -134,7 +134,7 @@ class SessionData {
 class Key {
  method: string;
  uri?: string;
- iv?: Buffer;
+ iv?: ArrayBuffer;
  format?: string;
  formatVersion?: string;
 

utils.ts

@@ -70,18 +70,18 @@ function toNumber(str: string, radix = 10) {
  return num;
 }
 
-function hexToByteSequence(str: string): Buffer {
+function hexToByteSequence(str: string): Uint8Array {
  if (str.startsWith('0x') || str.startsWith('0X')) {
  str = str.slice(2);
  }
- const numArray: number[] = [];
+ const numArray = new Uint8Array(str.length / 2);
  for (let i = 0; i < str.length; i += 2) {
- numArray.push(toNumber(str.slice(i, i + 2), 16));
+ numArray[i / 2] = Number.parseInt(str.slice(i, i + 2), 16);
  }
- return Buffer.from(numArray);
+ return numArray;
 }
 
-function byteSequenceToHex(sequence: Buffer, start = 0, end = sequence.length) {
+function byteSequenceToHex(sequence: ArrayBuffer, start = 0, end = sequence.byteLength) {
  if (end <= start) {
  THROW(new Error(`end must be larger than start : start=${start}, end=${end}`));
  }