bitwise

v2.2.1

Published

9 months ago

Manipulates bits, nibbles, bytes, and buffers.

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florianwendelborn

and binary bit bits bitwise buffer buffers change flip manipulate nand nibble nibbles nor not or read toggle write xnor xor

Example

import bitwise from 'bitwise'

const bits = bitwise.byte.read(42)
// [0, 0, 1, 0, 1, 0, 1, 0]

bitwise.bits.toString(bits, 4)
// '0010 1010'

bitwise.byte.write(bits)
// 42

bitwise.bits.and([0, 0, 1, 1], [0, 1, 0, 1])
// [0, 0, 0, 1]

bitwise.bits.xor([0, 0, 1, 1], [0, 1, 0, 1])
// [0, 1, 1, 0]

// cherry-pick parts of bitwise
import byte from 'bitwise/byte'
byte.read(42)
// [0, 0, 1, 0, 1, 0, 1, 0]

Installation

bits
- operations (and, circularShiftLeft, circularShiftRight, nand, nor, not, or, xnor, xor)
- reduce operations (reduceAnd, reduceNand, reduceNor, reduceOr, reduceXnor, reduceXor)
- toString
buffer
- create
- modify
- operations (and, nand, nor, not, or, xnor, xor)
- read
- readInt
- readUInt
byte
- read
- write
integer
nibble
- read
- write
string
- toBits

bits

// cherry-pick
import and from 'bitwise/bits/and'
import bits from 'bitwise/bits'
import toString from 'bitwise/bits/to-string'

bits.and

(bits1: Array<0|1>, bits2: Array<0|1>): Array<0|1>

Applies the bitwise AND operation, expects two arrays of the same size and returns a new one.

bitwise.bits.and([1, 0, 0, 0, 1, 1, 0, 1], [0, 1, 1, 0, 0, 1, 0, 0])
// [0, 0, 0, 0, 0, 1, 0, 0]

bits.circularShiftLeft

(bits: Array<0|1>, amount: number): Array<0|1>

Applies the bitwise ROL operation, expects two arrays of the same size and a shift amount and returns a new one.

bitwise.bits.circularShiftLeft([0, 0, 0, 1, 1, 1, 1, 1], 1)
// [0, 0, 1, 1, 1, 1, 1, 0]

bits.circularShiftRight

(bits: Array<0|1>, amount: number): Array<0|1>

Applies the bitwise ROR operation, expects two arrays of the same size and a shift amount and returns a new one.

bitwise.bits.circularShiftRight([0, 0, 0, 1, 1, 1, 1, 1], 1)
// [1, 0, 0, 0, 1, 1, 1, 1]

bits.nand

(bits1: Array<0|1>, bits2: Array<0|1>): Array<0|1>

Applies the bitwise NAND operation, expects two arrays of the same size and returns a new one.

bitwise.bits.nand([1, 0, 0, 0, 1, 1, 0, 1], [0, 1, 1, 0, 0, 1, 0, 0])
// [1, 1, 1, 0, 1, 0, 0, 1]

bits.nor

(bits1: Array<0|1>, bits2: Array<0|1>): Array<0|1>

Applies the bitwise NOR operation, expects two arrays of the same size and returns a new one.

bitwise.bits.nor([1, 0, 0, 0, 1, 1, 0, 1], [0, 1, 1, 0, 0, 1, 0, 0])
// [1, 1, 1, 0, 1, 0, 0, 1]

bits.not

(bits: Array<0|1>): Array<0|1>

Flips all given bits and returns the flipped bits.

bitwise.bits.not([1, 0, 1, 1, 0, 1])
// [0, 1, 0, 0, 1, 0]

bits.or

(bits1: Array<0|1>, bits2: Array<0|1>): Array<0|1>

Applies the bitwise OR operation, expects two arrays of the same size and returns a new one.

bitwise.bits.or([1, 0, 0, 0, 1, 1, 0, 1], [0, 1, 1, 0, 0, 1, 0, 0])
// [1, 1, 1, 0, 1, 1, 0, 1]

bits.xnor

(bits1: Array<0|1>, bits2: Array<0|1>): Array<0|1>

Applies the bitwise exclusive NOR operation, expects two arrays of the same size and returns a new one.

bitwise.bits.xnor([1, 0, 0, 0, 1, 1, 0, 1], [0, 1, 1, 0, 0, 1, 0, 0])
// [1, 1, 1, 0, 1, 0, 0, 1]

bits.xor

(bits1: Array<0|1>, bits2: Array<0|1>): Array<0|1>

Applies the bitwise exclusive OR operation, expects two arrays of the same size and returns a new one.

bitwise.bits.xor([1, 0, 0, 0, 1, 1, 0, 1], [0, 1, 1, 0, 0, 1, 0, 0])
// [1, 1, 1, 0, 1, 0, 0, 1]

bits.reduceAnd

(bits: Array<0|1>): 0|1

Applies the bitwise AND operation on the given bits. Returns one bit. Throws if less than 2 bits are given.

bitwise.bits.reduceAnd([1, 0, 0, 0, 1, 1, 0, 1])
// 0

bits.reduceNand

(bits: Array<0|1>): 0|1

Applies the NAND operation on the given bits. Returns one bit. Throws if less than 2 bits are given.

bitwise.bits.reduceNand([1, 0, 0, 0, 1, 1, 0, 1])
// 0

bits.reduceNor

(bits: Array<0|1>): 0|1

Applies the NOR operation on the given bits. Returns one bit. Throws if less than 2 bits are given.

bitwise.bits.reduceNor([1, 0, 0, 0, 1, 1, 0, 1])
// 0

bits.reduceOr

(bits: Array<0|1>): 0|1

Applies the OR operation on the given bits. Returns one bit. Throws if less than 2 bits are given.

bitwise.bits.reduceOr([1, 0, 0, 0, 1, 1, 0, 1])
// 1

bits.reduceXnor

(bits: Array<0|1>): 0|1

Applies the XNOR operation on the given bits. Returns one bit. Throws if less than 2 bits are given.

bitwise.bits.reduceXnor([1, 0, 0, 0, 1, 1, 0, 1])
// 1

bits.reduceXor

(bits: Array<0|1>): 0|1

Applies the XOR operation on the given bits. Returns one bit. Throws if less than 2 bits are given.

bitwise.bits.reduceXor([1, 0, 0, 0, 1, 1, 0, 1])
// 0

bits.toBoolean

(bits: Array<0|1>): Array<boolean>

Converts a bit array to a boolean array.

bitwise.bits.toBoolean([0, 1])
// [false, true]

bits.toString

(bits: Array<0|1>, spacing: number = 0, spacer: string = ' '): string

Converts a bit Array to a String. If defined, inserts spacer every spacing characters, but never inserts it as the last substring.

bitwise.bits.toString([1, 0, 1, 0, 1, 0], 2, '_')
// '10_10_10'

buffer

// cherry-pick
import and from 'bitwise/buffer/and'
import buffer from 'bitwise/buffer'
import create from 'bitwise/buffer/create'

buffer.create

(bits: Array<0|1>): Buffer

Creates a new buffer and writes the given bits.

const buffer = bitwise.buffer.create([1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 0])
// Buffer(1111 0001 1010 0000)

buffer.modify

(buffer: Buffer, newBits: Array<0|1>, bitOffset: number = 0): void

Modifies the buffer's bits to equal newBits starting at bitOffset.

const buffer = Buffer.from('A43A', 'hex')
bitwise.buffer.modify(buffer, [0, 0, 0, 1, 0, 0, 1], 3)
// Buffer(1010 1001 0011 1010)

buffer.and

(buffer1: Buffer, buffer2: Buffer, isLooping = false): Buffer

Applies a bitwise AND with buffer2 to every value in buffer1. Returns a new buffer. If isLooping is set, buffer1 may be read multiple times in case it's shorter than buffer2.

bitwise.buffer.and(buffer1, buffer2, false)
// Buffer(buffer1 AND buffer2)

buffer.nand

(buffer1: Buffer, buffer2: Buffer, isLooping = false): Buffer

Applies a bitwise NAND with buffer2 to every value in buffer1. Returns a new buffer. If isLooping is set, buffer1 may be read multiple times in case it's shorter than buffer2.

bitwise.buffer.nand(buffer1, buffer2, false)
// Buffer(buffer1 NAND buffer2)

buffer.nor

(buffer1: Buffer, buffer2: Buffer, isLooping = false): Buffer

Applies a bitwise NOR with buffer2 to every value in buffer1. Returns a new buffer. If isLooping is set, buffer1 may be read multiple times in case it's shorter than buffer2.

bitwise.buffer.nor(buffer1, buffer2, false)
// Buffer(buffer1 NOR buffer2)

buffer.not

(buffer: Buffer): Buffer

Flips all bits in the given buffer.

bitwise.buffer.not(buffer, false)
// Buffer(NOT buffer)

buffer.or

(buffer1: Buffer, buffer2: Buffer, isLooping = false): Buffer

Applies a bitwise OR with buffer2 to every value in buffer1. Returns a new buffer. If isLooping is set, buffer1 may be read multiple times in case it's shorter than buffer2.

bitwise.buffer.or(buffer1, buffer2, false)
// Buffer(buffer1 OR buffer2)

buffer.xnor

(buffer1: Buffer, buffer2: Buffer, isLooping = false): Buffer

Applies a bitwise XNOR with buffer2 to every value in buffer1. Returns a new buffer. If isLooping is set, buffer1 may be read multiple times in case it's shorter than buffer2.

bitwise.buffer.xnor(buffer1, buffer2, false)
// Buffer(buffer1 XNOR buffer2)

buffer.xor

(buffer1: Buffer, buffer2: Buffer, isLooping = false): Buffer

Applies a bitwise XOR with buffer2 to every value in buffer1. Returns a new buffer. If isLooping is set, buffer1 may be read multiple times in case it's shorter than buffer2.

bitwise.buffer.xor(buffer1, buffer2, false)
// Buffer(buffer1 XOR buffer2)

buffer.read

(buffer: Buffer, bitOffset: number = 0, bitLength?: number): Array<0|1>

Returns an Array containing bitLength bits starting at bitOffset. If no bitLength is given, it's assumed to be the rest of the buffer.

const buffer = Buffer.from('ED743E17', 'hex')
bitwise.buffer.read(buffer, 12)
// [0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1]

buffer.readInt

(buffer: Buffer, bitOffset: number = 0, bitLength: number = 8): number

Converts a section of a buffer to a signed integer.

// buffer 11110110
bitwise.buffer.readInt(buffer, 3, 5)
// -10

buffer.readUInt

(buffer: Buffer, bitOffset: number = 0, bitLength: number = 8): number

Converts a section of a buffer to an unsigned integer.

// buffer 11110110
bitwise.buffer.readUInt(buffer, 3, 5)
// 22

byte

// cherry-pick
import byte from 'bitwise/byte'
import read from 'bitwise/byte/read'

byte.read

(byte: UInt8): Array<0|1>

Returns an Array of length 8 containing the read bits.

bitwise.byte.read(42)
// [0, 0, 1, 0, 1, 0, 1, 0]
bitwise.byte.read(256)
// RangeError('invalid size')

byte.write

(bits: Array<0|1>): UInt8

Returns a Byte (0-255) which represents the given bits.

bitwise.byte.write([0, 0, 1, 0, 1, 0, 1, 0])
// 42
bitwise.byte.write([0, 0, 1, 0, 1, 0, 1, 0, 0])
// RangeError('invalid array length')

integer

// cherry-pick
import integer from 'bitwise/integer'

integer.getBit

(number: number, position: number): 0|1

Gets the value of a specific bit.

bitwise.integer.getBit(128, 7)
// 1

integer.setBit

(number: number, position: number, value: 0|1): Array<0|1>

Sets the value of a specific bit.

bitwise.integer.setBit(128, 7, 0)
// 0

integer.toggleBit

(number: number, position: number): Array<0|1>

Toggles the value of a specific bit.

bitwise.integer.toggleBit(128, 7)
// 0

nibble

// cherry-pick
import nibble from 'bitwise/nibble'
import read from 'bitwise/nibble/read'

nibble.read

(nibble: UInt4): Array<0|1>

Returns an Array of length 4 containing the read bits.

bitwise.nibble.read(15)
// [1, 1, 1, 1]
bitwise.nibble.read(42)
// RangeError('invalid size')

nibble.write

(nibble: [<0|1>, <0|1>, <0|1>, <0|1>]): UInt4

Returns a Nibble (0-15) which represents the given bits.

bitwise.nibble.write([0, 0, 1, 0])
// 2
bitwise.nibble.write([0, 0, 1, 0, 1])
// RangeError('invalid array length')

string

// cherry-pick
import string from 'bitwise/string'
import toBits from 'bitwise/string/to-bits'

string.toBits

(string: string): Array<0|1>

Converts a string into an array of bits. Ignores all characters except 1 and 0.

bitwise.string.toBits('10 10 12$%_.0')
// [1, 0, 1, 0, 1, 0]

Development

bitwise uses bun instead of node

# install dependencies
bun install

# run tests
bun test

# build
bun run build

History

2.2.1

remove typescript from dependencies in favor of devDependencies
(internal) update and apply prettier

2.2.0

add npm provenance support to package
(internal) add auto-publish from pipelines
(internal) Switch to bun

2.1.0

Add bits.circularShiftLeft (#44 / #49) via @0xflotus
Add bits.circularShiftRight (#44 / #49) via @0xflotus

2.0.2–2.0.3

Add Support for Tree Shaking

2.0.1

Readme/package.json updates

2.0.0

refactor to typescript
remove bitwise.buffer.readCInt()

1.4.0

improve require() support

1.3.0

add bits.toBoolean

1.2.0

add bits.reduceAnd
add bits.reduceNand
add bits.reduceNor
add bits.reduceOr
add bits.reduceXnor
add bits.reduceXor

1.1.2

split up buffer.operations

1.1.1

split up bits.operations

1.1.0

add integer.getBit
add integer.setBit
add integer.toggleBit

1.0.0

rewrite in ES6
improve utilization of bitwise operators
improve API (breaking change)

0.2.0

Added buffer bitwise operations

0.1.2

Added nor, xnor, nand
Fixed bitwise operations modifying original array

0.1.0

Re-ordered the arguments in readInt, readCInt, readUInt
Added not, and, or, xor
Renamed flipBits to not