ByteView

Work with bytes. Can be used as a Buffer, TypedArray, BitView, DataView. Client side and server side support. Encode strings & serialize objects.

Table of Contents

• Installation
• Usage

Install

npm i byteview 

Usage

static ByteView.from:

import ByteView from 'byteview'

const bv = ByteView.from('Hello World!')

/*
 * nodejs prints: <ByteView SGVsbG8gV29ybGQh />
 * browser prints: ByteView(12) [
 *   72, 101, 108, 108, 111,
 *   32,  87, 111, 114, 108,
 *   100,  33
 * ]
 */
console.log(bv)

class ByteView extends Uint8Array {

  static from (
    input: ArrayLike | ArrayBufferView | ArrayBuffer | string | bigint,
    encodingOrOffset?: string | number,
    length?: number
  ): ByteView

  static alloc (size: number, encoding?: string): ByteView

  static allocBits (size: number, encoding?: string): ByteView

  static concat (list: Array<ByteView>, length?: number): ByteView

  /**
   *
   * Returns true if instance of ByteView.
   */
  static isByteView (byteView: any): boolean

  /**
   *
   * Returns true if instance of TypedArray or DataView.
   */
  static isView (input: any): boolean

  /**
   *
   * Returns true if instance of ArrayBuffer.
   */
  static isNativeBuffer (input: any): boolean

  /**
   *
   * Returns a base64 encoded string.
   */
  static serialize (input: object): string

  /**
   *
   * Get byteLength of string.
   */
  static byteLength (
    string: string,
    encoding = 'utf8'
  ): number

  /**
   *
   * If running process is little endian.
   */
  static isOSLittleEndian: boolean

  /**
   *
   * Get real size of ByteView.
   * Useful when being used as a bit array.
   */
  get size (): number

  /**
   *
   * Get bitOffset of ByteView.
   * Useful when being used as a bit array.
   */
  get bitOffset (): number

  get encoding (): string

  set encoding (encoding: string)

  /**
   *
   * Interprets byteView as an array of unsigned 16-bit integers and swaps the byte order in-place.
   */
  swap16 (): this

  /**
   *
   * Interprets byteView as an array of unsigned 32-bit integers and swaps the byte order in-place.
   */
  swap32 (): this

  /**
   *
   * Interprets byteView as an array of unsigned 64-bit integers and swaps the byte order in-place.
   */
  swap64 (): this

  /**
   *
   * Gets an array of 3 valid colors.
   */
  getRGB (index: number): [number, number, number]

  /**
   *
   * Gets a color hex at the specified index.
   */
  getColorHex (index: number): string

  /**
   *
   * Returns the bit at the specified index.
   * Accounts for ByteView.bitOffset.
   */
  getBit (index: number): 1 | 0

  /**
   *
   * Sets the bit at the specified index.
   * Accounts for ByteView.bitOffset.
   */
  setBit (index: number, value: number): number

  /**
   *
   * Returns the bits from start to end.
   */
  sliceBits (start: number, end: number): number

  /**
   *
   * Get an unsigned 5-bit integer.
   */
  getUint5 (index: number): number

  /**
   *
   * Get an unsigned 6-bit integer.
   */
  getUint6 (index: number): number

  /**
   *
   * Get an unsigned 8-bit integer.
   */
  getUint8 (offset: number): number

  /**
   *
   * Set an unsigned 8-bit integer.
   */
  setUint8 (
    offset: number,
    value: number
  ): number

  /**
   *
   * Get an unsigned 16-bit integer.
   */
  getUint16 (
    offset: number,
    littleEndian = ByteView.isOSLittleEndian
  ): number

  /**
   *
   * Set an unsigned 16-bit integer.
   */
  setUint16 (
    offset: number,
    value: number,
    littleEndian = ByteView.isOSLittleEndian
  ): number

  /**
   *
   * Get an unsigned 32-bit integer.
   */
  getUint32 (
    offset: number,
    littleEndian = ByteView.isOSLittleEndian
  ): number

  /**
   *
   * Set an unsigned 32-bit integer.
   */
  setUint32 (
    offset: number,
    value: number,
    littleEndian = ByteView.isOSLittleEndian
  ): number

  /**
   *
   * Get an unsigned 64-bit bigint.
   */
  getBigUint64 (
    offset: number,
    littleEndian = ByteView.isOSLittleEndian
  ): bigint

  /**
   *
   * Set an unsigned 64-bit bigint.
   */
  setBigUint64 (
    offset: number,
    value: bigint,
    littleEndian = ByteView.isOSLittleEndian
  ): number

  /**
   *
   * Get a signed integer.
   */
  getInt (
    offset: number,
    byteLength: number,
    littleEndian = ByteView.isOSLittleEndian
  ): number

  /**
   *
   * Get a signed 8-bit integer.
   */
  getInt8 (offset: number): number

  /**
   *
   * Set a signed 8-bit integer.
   */
  setInt8 (offset: number, value: number): number

  /**
   *
   * Get a signed 16-bit integer.
   */
  getInt16 (
    offset: number,
    littleEndian = ByteView.isOSLittleEndian
  ): number

  /**
   *
   * Set a signed 16-bit integer.
   */
  setInt16 (
    offset: number,
    value: number,
    littleEndian = ByteView.isOSLittleEndian
  ): number

  /**
   *
   * Get a signed 32-bit integer.
   */
  getInt32 (
    offset: number,
    littleEndian = ByteView.isOSLittleEndian
  ): number

  /**
   *
   * Set a signed 32-bit integer.
   */
  setInt32 (
    offset: number,
    value: number,
    littleEndian = ByteView.isOSLittleEndian
  ): number

  /**
   *
   * Set a signed 6-bit integer.
   */
  getInt6 (index: number): number

  /**
   *
   * Get a JSON object representation of a ByteView.
   */
  toJSON (): {
    type: 'ByteView',
    data: Array<number>
  }

  /**
   *
   * Prints a ByteView string.
   */
  inspect (): string

  toString (
    encoding?: 'utf8' |
      'hex' |
      'base32' |
      'base32hex' |
      'base32crockford' |
      'base64' |
      'base64url' |
      'ascii' |
      'latin1' |
      'binary' |
      'ucs2' |
      'ucs-2' |
      'utf16le' |
      'utf-16le'
  ): string

  subarray (start: number, end?: number): ByteView

  copy (
    target: ByteView | ArrayBufferView,
    targetStart?: number,
    start?: number,
    end?: number
  ): number

  fill (
    val: ByteView | number | Array,
    start: number,
    end?: number,
    encoding?: number
  ): this

  equals (byteView: ByteView): boolean

  compare (
    target: ByteView,
    start?: number,
    end?: number,
    thisStart?: number,
    thisEnd?: number
  ): -1 | 0 | 1

  write (
    string: string,
    offset: number,
    length?: number,
    encoding?: string
  ): number

  toBigInt (): bigint

  padStart (targetLength: number): this
}