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Jaco Greeff e832aebb07 Introduce @polkadot/util-rlp (#76 )

* Add toU8a conversions

* Add u8a utilities

* @polkadot/rlp with encoding

* Decoding test runthrough

* Update util locations

* Convert util-triehash to use util-rlp

* Allow keccak from Uint8Array

* Pass Uint8Array to keccak input

* Update documentation

* Skip some doc generation

* Update @polkadot/dev

* Update doc typo

* Update allocations

* Retrieve tests from ethereumjs-testing

* Simplify test retrieval

* Exclude etereumjs-testing from flow

2018-02-08 14:50:54 +01:00

3.2 KiB

Raw Blame History

u8a

Utility methods to convert to and from Uint8Array objects

u8aConcat Creates a concatenated Uint8Array from the inputs.
u8aFromBn Creates a Uint8Array value from a BN object.
u8aFromBuffer Creates a Uint8Array value from a Buffer object.
u8aFromHex Creates a Uint8Array value from a hex string.
u8aFromString Creates a Uint8Array object from a string.
u8aFromUtf8 Creates a Uint8Array object from a utf-8 string.
u8aToBuffer Creates a Buffer object from a hex string.
u8aToHex Creates a hex string from a Uint8Array object.
u8aToUtf8 Creates a utf-8 string from a Uint8Array object.

u8aConcat

Creates a concatenated Uint8Array from the inputs.

u8aConcat (values: Array<Uint8Array>): Uint8Array

Concatenates the input arrays into a single UInt8Array.

import { u8aConcat } from '@polkadot/util';

u8aConcat([
new Uint8Array([1, 2, 3]),
new Uint8Array([4, 5, 6])
]); // [1, 2, 3, 4, 5, 6]

u8aFromBn

Creates a Uint8Array value from a BN object. (alias of bnToU8a)

u8aFromBn (value?: BN): Uint8Array

u8aFromBuffer

Creates a Uint8Array value from a Buffer object. (alias of bufferToU8a)

u8aFromBuffer (value?: Buffer): Uint8Array

u8aFromHex

Creates a Uint8Array value from a hex string. (alias of hexToU8a)

u8aFromHex (value?: string): Uint8Array

u8aFromString

Creates a Uint8Array object from a string.

u8aFromString (value: string): UInt8Array

String input values return the actual encoded UInt8Array.

import { u8aFromString } from '@polkadot/util';

u8aFromString('hello'); // [0x68, 0x65, 0x6c, 0x6c, 0x6f]

u8aFromUtf8

Creates a Uint8Array object from a utf-8 string.

u8aFromUtf8 (value?: string): UInt8Array

String input values return the actual encoded UInt8Array. null or undefined values returns an empty encoded array.

import { u8aFromUtf8 } from '@polkadot/util';

u8aFromUtf8('hello'); // [0x68, 0x65, 0x6c, 0x6c, 0x6f]

u8aToBuffer

Creates a Buffer object from a hex string.

u8aToBuffer (value?: UInt8Array): Buffer

null inputs returns an empty Buffer result. UInt8Array input values return the actual bytes value converted to a Buffer. Anything that is not a UInt8Array throws an error.

import { u8aToBuffer } from '@polkadot/util';

console.log('Buffer', u8aToBuffer('0x123480001f'));

u8aToHex

Creates a hex string from a Uint8Array object.

u8aToHex (value?: UInt8Array): string

UInt8Array input values return the actual hex string. null or undefined values returns an 0x string.

import { u8aToHex } from '@polkadot/util';

u8aToHex(new Uint8Array([0x68, 0x65, 0x6c, 0x6c, 0xf])); // 0x68656c0f

u8aToUtf8

Creates a utf-8 string from a Uint8Array object.

u8aToUtf8 (value?: UInt8Array): string

UInt8Array input values return the actual decoded utf-8 string. null or undefined values returns an empty string.

import { u8aToUtf8 } from '@polkadot/util';

u8aToUtf8(new Uint8Array([0x68, 0x65, 0x6c, 0x6c, 0x6f])); // hello

3.2 KiB Raw Blame History

u8a