51 lines
1.5 KiB
TypeScript
51 lines
1.5 KiB
TypeScript
// Copyright 2021 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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/** Convenience methods for working with Uint8Array buffers */
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/**
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* Returns a new array where all instances of target have been replaced by the
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* provided substitue.
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*/
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export function replace(
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data: Uint8Array,
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target: number,
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substitute: number[]
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): Uint8Array {
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const result: number[] = [];
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data.forEach(value => {
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if (value === target) {
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result.push(...substitute);
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} else {
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result.push(value);
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}
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});
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return Uint8Array.from(result);
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}
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/** Flattens the provided list of Uint8Arrays into a single array. */
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export function concatenate(...byteList: Uint8Array[]): Uint8Array {
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const length = byteList.reduce(
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(accumulator, bytes) => accumulator + bytes.length,
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0
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);
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const result = new Uint8Array(length);
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let offset = 0;
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byteList.forEach(value => {
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result.set(value, offset);
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offset += value.length;
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});
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return result;
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}
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