mirror of
https://github.com/signalapp/Signal-Desktop.git
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39 lines
1.2 KiB
TypeScript
39 lines
1.2 KiB
TypeScript
// Copyright 2026 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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export function encodeDelimited(
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buf: Uint8Array<ArrayBuffer>
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): [Uint8Array<ArrayBuffer>, Uint8Array<ArrayBuffer>] {
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const len = buf.byteLength;
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let prefix: Uint8Array<ArrayBuffer>;
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/* eslint-disable no-bitwise */
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if (len < 0x80) {
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prefix = new Uint8Array(1);
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prefix[0] = len;
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} else if (len < 0x4000) {
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prefix = new Uint8Array(2);
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prefix[0] = 0x80 | (len & 0x7f);
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prefix[1] = len >>> 7;
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} else if (len < 0x200000) {
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prefix = new Uint8Array(3);
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prefix[0] = 0x80 | (len & 0x7f);
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prefix[1] = 0x80 | ((len >>> 7) & 0x7f);
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prefix[2] = len >>> 14;
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} else if (len < 0x10000000) {
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prefix = new Uint8Array(4);
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prefix[0] = 0x80 | (len & 0x7f);
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prefix[1] = 0x80 | ((len >>> 7) & 0x7f);
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prefix[2] = 0x80 | ((len >>> 14) & 0x7f);
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prefix[3] = len >>> 21;
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} else {
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prefix = new Uint8Array(5);
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prefix[0] = 0x80 | (len & 0x7f);
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prefix[1] = 0x80 | ((len >>> 7) & 0x7f);
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prefix[2] = 0x80 | ((len >>> 14) & 0x7f);
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prefix[3] = 0x80 | ((len >>> 21) & 0x7f);
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prefix[4] = len >>> 28;
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}
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/* eslint-enable no-bitwise */
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return [prefix, buf];
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}
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