| 1 | // Copyright 2017-2022 @polkadot/util authors & contributors
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| 2 | // SPDX-License-Identifier: Apache-2.0
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| 3 |
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| 4 | /**
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| 5 | * @name u8aToHex
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| 6 | * @summary Creates a hex string from a Uint8Array object.
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| 7 | * @description
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| 8 | * `UInt8Array` input values return the actual hex string. `null` or `undefined` values returns an `0x` string.
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| 9 | * @example
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| 10 | * <BR>
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| 11 | *
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| 12 | * ```javascript
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| 13 | * import { u8aToHex } from '@polkadot/util';
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| 14 | *
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| 15 | * u8aToHex(new Uint8Array([0x68, 0x65, 0x6c, 0x6c, 0xf])); // 0x68656c0f
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| 16 | * ```
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| 17 | */
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| 18 | export function u8aToHex(value, bitLength = -1, isPrefixed = true) {
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| 19 | const length = Math.ceil(bitLength / 8);
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| 20 | return `${isPrefixed ? '0x' : ''}${!value || !value.length ? '' : length > 0 && value.length > length ? `${Buffer.from(value.subarray(0, length / 2)).toString('hex')}…${Buffer.from(value.subarray(value.length - length / 2)).toString('hex')}` : Buffer.from(value).toString('hex')}`;
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| 21 | } |
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