75 lines
1.9 KiB
JavaScript
75 lines
1.9 KiB
JavaScript
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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function rootCanalCalculateMessageSize(name, args) {
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let result = 0;
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result += 1 + name.length; // length of name + it's data
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result += 1; // count of args
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for (let i = 0; i < args.length; i++) {
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result += 1; // length of args[i]
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result += args[i].length; // data of args[i]
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}
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return result;
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}
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function rootCanalAddU8(array, pos, val) {
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array[pos] = val & 0xff;
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return pos + 1;
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}
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function rootCanalAddPayload(array, pos, payload) {
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array.set(payload, pos);
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return pos + payload.length;
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}
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function rootCanalAddString(array, pos, val) {
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let curPos = pos;
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curPos = rootCanalAddU8(array, curPos, val.length);
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return rootCanalAddPayload(array, curPos, utf8Encoder.encode(val));
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}
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function createRootcanalMessage(command, args) {
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let messageSize = rootCanalCalculateMessageSize(command, args);
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let arrayBuffer = new ArrayBuffer(messageSize);
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let array = new Uint8Array(arrayBuffer);
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let pos = 0;
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pos = rootCanalAddString(array, pos, command);
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pos = rootCanalAddU8(array, pos, args.length);
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for (let i = 0; i < args.length; i++) {
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pos = rootCanalAddString(array, pos, args[i]);
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}
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return array;
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}
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function decodeRootcanalMessage(array) {
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let size = array[0];
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let message = array.slice(1);
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return utf8Decoder.decode(message);
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}
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