Created
September 18, 2023 08:31
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Simple JS Buffer implementation to easily read and write Uint8Arrays
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| export default class Buffer extends Uint8Array { | |
| /** | |
| * @param {number} length | |
| */ | |
| constructor(length) { | |
| super(length); | |
| this._cursor = 0; | |
| } | |
| /** | |
| * @param {number} length | |
| * @returns {Uint8Array} | |
| */ | |
| read(length) { | |
| if (this._cursor + length > this.length) { | |
| throw new Error(`Buffer overflow: ${this._cursor} + ${length} > ${this.length}`); | |
| } | |
| const result = this.slice(this._cursor, this._cursor + length); | |
| this._cursor += length; | |
| return result; | |
| } | |
| /** | |
| * @returns {number} | |
| */ | |
| readUint8() { | |
| return this.read(1)[0]; | |
| } | |
| /** | |
| * @param {ArrayLike<number>} data | |
| * @returns {number} | |
| */ | |
| write(data) { | |
| if (this._cursor + data.length > this.length) { | |
| throw new Error(`Buffer overflow: ${this._cursor} + ${data.length} > ${this.length}`); | |
| } | |
| this.set(data, this._cursor); | |
| return this._cursor += data.length; | |
| } | |
| /** | |
| * @param {number} byte | |
| * @returns {number} | |
| */ | |
| writeUint8(byte) { | |
| return this.write([byte]); | |
| } | |
| resetCursor() { | |
| this._cursor = 0; | |
| } | |
| } |
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