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33 lines
963 B
TypeScript
33 lines
963 B
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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/**
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* Slice number into 64bit big endian byte array.
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*
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* @example Usage
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* ```ts
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* import { sliceLongToBytes } from "@std/io/slice-long-to-bytes";
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* import { assertEquals } from "@std/assert/equals";
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*
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* const dest = sliceLongToBytes(0x123456789a);
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* assertEquals(dest, [0, 0, 0, 0x12, 0x34, 0x56, 0x78, 0x9a]);
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* ```
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*
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* @param d The number to be sliced
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* @param dest The array to store the sliced bytes
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* @returns The sliced bytes
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*
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* @deprecated This will be removed in 1.0.0. Use the {@link https://developer.mozilla.org/en-US/docs/Web/API/Streams_API | Web Streams API} instead.
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*/
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export function sliceLongToBytes(
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d: number,
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dest: number[] = Array.from<number>({ length: 8 }),
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): number[] {
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let big = BigInt(d);
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for (let i = 0; i < 8; i++) {
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dest[7 - i] = Number(big & 0xffn);
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big >>= 8n;
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}
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return dest;
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}
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