31 lines
1009 B
TypeScript
31 lines
1009 B
TypeScript
// Copyright 2017-2023 @polkadot/util authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { HexString } from '../types.js';
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/**
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* @name u8aToHex
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* @summary Creates a hex string from a Uint8Array object.
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* @description
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* `UInt8Array` input values return the actual hex string. `null` or `undefined` values returns an `0x` string.
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* @example
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* <BR>
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*
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* ```javascript
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* import { u8aToHex } from '@polkadot/util';
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*
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* u8aToHex(new Uint8Array([0x68, 0x65, 0x6c, 0x6c, 0xf])); // 0x68656c0f
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* ```
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*/
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export function u8aToHex (value?: Uint8Array | null, bitLength = -1, isPrefixed = true): HexString {
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const length = Math.ceil(bitLength / 8);
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return `${isPrefixed ? '0x' : ''}${
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!value?.length
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? ''
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: (bitLength > 0 && value.length > length)
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? `${Buffer.from(value.subarray(0, length / 2)).toString('hex')}…${Buffer.from(value.subarray(value.length - length / 2)).toString('hex')}`
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: Buffer.from(value).toString('hex')
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}` as HexString;
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}
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