forked from mirrors/gecko-dev
82 lines
2.5 KiB
JavaScript
82 lines
2.5 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* A module to track device changes
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* Adapted from adb.js at
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* https://github.com/mozilla/adbhelper/tree/f44386c2d8cb7635a7d2c5a51191c89b886f8327
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*/
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"use strict";
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const {
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AdbSocket,
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} = require("resource://devtools/client/shared/remote-debugging/adb/adb-socket.js");
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const { dumpn } = require("resource://devtools/shared/DevToolsUtils.js");
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const OKAY = 0x59414b4f;
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const FAIL = 0x4c494146;
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// Return buffer, which differs between Gecko versions
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function getBuffer(packet) {
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return packet.buffer ? packet.buffer : packet;
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}
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// @param aPacket The packet to get the length from.
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// @param aIgnoreResponse True if this packet has no OKAY/FAIL.
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// @return A js object { length:...; data:... }
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function unpackPacket(packet, ignoreResponse) {
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const buffer = getBuffer(packet);
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dumpn("Len buffer: " + buffer.byteLength);
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if (buffer.byteLength === 4 && !ignoreResponse) {
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dumpn("Packet empty");
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return { length: 0, data: "" };
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}
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const lengthView = new Uint8Array(buffer, ignoreResponse ? 0 : 4, 4);
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const decoder = new TextDecoder();
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const length = parseInt(decoder.decode(lengthView), 16);
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const text = new Uint8Array(buffer, ignoreResponse ? 4 : 8, length);
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return { length, data: decoder.decode(text) };
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}
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// Checks if the response is expected (defaults to OKAY).
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// @return true if response equals expected.
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function checkResponse(packet, expected = OKAY) {
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const buffer = getBuffer(packet);
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const view = new Uint32Array(buffer, 0, 1);
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if (view[0] == FAIL) {
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dumpn("Response: FAIL");
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}
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dumpn("view[0] = " + view[0]);
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return view[0] == expected;
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}
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// @param aCommand A protocol-level command as described in
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// http://androidxref.com/4.0.4/xref/system/core/adb/OVERVIEW.TXT and
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// http://androidxref.com/4.0.4/xref/system/core/adb/SERVICES.TXT
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// @return A 8 bit typed array.
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function createRequest(command) {
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let length = command.length.toString(16).toUpperCase();
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while (length.length < 4) {
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length = "0" + length;
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}
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const encoder = new TextEncoder();
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dumpn("Created request: " + length + command);
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return encoder.encode(length + command);
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}
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function connect() {
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return new AdbSocket();
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}
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const client = {
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getBuffer,
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unpackPacket,
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checkResponse,
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createRequest,
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connect,
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};
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module.exports = client;
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