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* Returns a new array where all instances of target have been replaced by the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