2021-10-31 16:01:50 +01:00
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/* Copyright (C) 2021 José Rebelo
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This file is part of Gadgetbridge.
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Gadgetbridge is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Gadgetbridge is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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package nodomain.freeyourgadget.gadgetbridge.service.devices.sony.wh1000xm3;
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import android.content.SharedPreferences;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.util.Arrays;
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import nodomain.freeyourgadget.gadgetbridge.GBApplication;
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import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst;
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import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEvent;
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import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEventSendBytes;
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2021-10-31 16:01:50 +01:00
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import nodomain.freeyourgadget.gadgetbridge.devices.sony.wh1000xm3.AmbientSoundControl;
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import nodomain.freeyourgadget.gadgetbridge.devices.sony.wh1000xm3.AutomaticPowerOff;
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import nodomain.freeyourgadget.gadgetbridge.devices.sony.wh1000xm3.EqualizerCustomBands;
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import nodomain.freeyourgadget.gadgetbridge.devices.sony.wh1000xm3.EqualizerPreset;
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import nodomain.freeyourgadget.gadgetbridge.devices.sony.wh1000xm3.SoundPosition;
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import nodomain.freeyourgadget.gadgetbridge.devices.sony.wh1000xm3.SurroundMode;
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import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
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import nodomain.freeyourgadget.gadgetbridge.service.serial.GBDeviceProtocol;
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import nodomain.freeyourgadget.gadgetbridge.util.GB;
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public class SonyWh1000Xm3Protocol extends GBDeviceProtocol {
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private static final Logger LOG = LoggerFactory.getLogger(SonyWh1000Xm3Protocol.class);
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/**
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* Packet format:
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* <p>
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* - PACKET_HEADER
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* - Command type? - almost always 0x0c or 0x0e?
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* - Sequence Number - needs to be updated with the one sent in the ACK responses
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* - 4-byte big endian int with number of bytes that will follow
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* - N bytes of data
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* - Checksum (1-byte sum, excluding header)
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* - PACKET_TRAILER
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* <p>
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* Data between PACKET_HEADER and PACKET_TRAILER is escaped with PACKET_ESCAPE, and the
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* following byte masked with PACKET_ESCAPE_MASK.
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*/
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public static final byte PACKET_HEADER = 0x3e;
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public static final byte PACKET_TRAILER = 0x3c;
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public static final byte PACKET_ESCAPE = 0x3d;
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public static final byte PACKET_ESCAPE_MASK = (byte) 0b11101111;
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private static final byte MSG_TYPE_ACK = 0x01;
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private static final byte CMD_SOUND_SURROUND = 0x01;
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private static final byte CMD_SOUND_POSITION = 0x02;
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private byte sequenceNumber = 0;
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public SonyWh1000Xm3Protocol(GBDevice device) {
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super(device);
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}
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@Override
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public GBDeviceEvent[] decodeResponse(byte[] res) {
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byte[] message = unescape(res);
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String hexdump = GB.hexdump(message, 0, message.length);
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LOG.debug("Received {}", hexdump);
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byte messageChecksum = message[message.length - 1];
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byte expectedChecksum = calcChecksum(message, true);
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if (messageChecksum != expectedChecksum) {
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LOG.error("Invalid checksum for {}", hexdump);
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return null;
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}
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2021-11-16 22:02:34 +01:00
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int payloadLength = ((message[2] << 24) & 0xFF000000) | ((message[3] << 16) & 0xFF0000) | ((message[4] << 8) & 0xFF00) | (message[5] & 0xFF);
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if (payloadLength != message.length - 7) {
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LOG.error("Unexpected payload length {}, expected {}", message.length - 7, payloadLength);
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return null;
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}
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if (message[0] == MSG_TYPE_ACK) {
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LOG.info("Received ACK: {}", hexdump);
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sequenceNumber = message[1];
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return new GBDeviceEvent[]{new GBDeviceEventSendBytes(encodeAck())};
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}
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LOG.warn("Unknown message: {}", hexdump);
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2021-11-16 23:56:38 +01:00
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return null;
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}
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@Override
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public byte[] encodeSendConfiguration(String config) {
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final SharedPreferences prefs = GBApplication.getDeviceSpecificSharedPrefs(getDevice().getAddress());
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EqualizerPreset equalizerPreset = EqualizerPreset.valueOf(prefs.getString(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MODE, "off").toUpperCase());
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switch (config) {
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_AMBIENT_SOUND_CONTROL:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_FOCUS_VOICE:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_AMBIENT_SOUND_LEVEL:
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String soundControl = prefs.getString(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_AMBIENT_SOUND_CONTROL, "noise_cancelling");
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boolean focusVoice = prefs.getBoolean(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_FOCUS_VOICE, false);
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int level = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_AMBIENT_SOUND_LEVEL, 0);
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return encodeSoundControl(AmbientSoundControl.valueOf(soundControl.toUpperCase()), focusVoice, level);
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_SOUND_POSITION:
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return encodeSoundPosition(
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SoundPosition.valueOf(prefs.getString(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_SOUND_POSITION, "off").toUpperCase())
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);
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_SURROUND_MODE:
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return encodeSurroundMode(
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SurroundMode.valueOf(prefs.getString(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_SURROUND_MODE, "off").toUpperCase())
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);
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MODE:
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return encodeEqualizerPreset(equalizerPreset);
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_BAND_400:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_BAND_1000:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_BAND_2500:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_BAND_6300:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_BAND_16000:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_CLEAR_BASS:
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int m_band1 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_BAND_400, 10) - 10;
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int m_band2 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_BAND_1000, 10) - 10;
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int m_band3 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_BAND_2500, 10) - 10;
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int m_band4 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_BAND_6300, 10) - 10;
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int m_band5 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_BAND_16000, 10) - 10;
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int m_bass = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MANUAL_CLEAR_BASS, 10) - 10;
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// Set the equalizer preset, since changing the bands will switch it
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// TODO: This is not updating the UI once the user returns to the previous screen
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prefs.edit().putString(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MODE, EqualizerPreset.MANUAL.toString().toLowerCase()).apply();
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return encodeEqualizerCustomBands(EqualizerPreset.MANUAL, equalizerPreset, new EqualizerCustomBands(Arrays.asList(m_band1, m_band2, m_band3, m_band4, m_band5), m_bass));
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_BAND_400:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_BAND_1000:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_BAND_2500:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_BAND_6300:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_BAND_16000:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_CLEAR_BASS:
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int c1_band1 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_BAND_400, 10) - 10;
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int c1_band2 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_BAND_1000, 10) - 10;
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int c1_band3 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_BAND_2500, 10) - 10;
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int c1_band4 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_BAND_6300, 10) - 10;
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int c1_band5 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_BAND_16000, 10) - 10;
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int c1_bass = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_1_CLEAR_BASS, 10) - 10;
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// Set the equalizer preset, since changing the bands will switch it
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// TODO: This is not updating the UI once the user returns to the previous screen
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prefs.edit().putString(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MODE, EqualizerPreset.CUSTOM_1.toString().toLowerCase()).apply();
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return encodeEqualizerCustomBands(EqualizerPreset.CUSTOM_1, equalizerPreset, new EqualizerCustomBands(Arrays.asList(c1_band1, c1_band2, c1_band3, c1_band4, c1_band5), c1_bass));
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_BAND_400:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_BAND_1000:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_BAND_2500:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_BAND_6300:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_BAND_16000:
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_CLEAR_BASS:
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int c2_band1 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_BAND_400, 10) - 10;
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int c2_band2 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_BAND_1000, 10) - 10;
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int c2_band3 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_BAND_2500, 10) - 10;
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int c2_band4 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_BAND_6300, 10) - 10;
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int c2_band5 = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_BAND_16000, 10) - 10;
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int c2_bass = prefs.getInt(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_CUSTOM_2_CLEAR_BASS, 10) - 10;
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// Set the equalizer preset, since changing the bands will switch it
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// TODO: This is not updating the UI once the user returns to the previous screen
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prefs.edit().putString(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_EQUALIZER_MODE, EqualizerPreset.CUSTOM_2.toString().toLowerCase()).apply();
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return encodeEqualizerCustomBands(EqualizerPreset.CUSTOM_2, equalizerPreset, new EqualizerCustomBands(Arrays.asList(c2_band1, c2_band2, c2_band3, c2_band4, c2_band5), c2_bass));
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_DSEE_HX:
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return encodeDSEEHX(prefs.getBoolean(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_DSEE_HX, false));
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_TOUCH_SENSOR:
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return encodeTouchSensor(prefs.getBoolean(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_TOUCH_SENSOR, true));
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_AUTOMATIC_POWER_OFF:
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return encodeAutomaticPowerOff(
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AutomaticPowerOff.valueOf(prefs.getString(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_AUTOMATIC_POWER_OFF, "off").toUpperCase())
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);
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case DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_NOTIFICATION_VOICE_GUIDE:
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return encodeVoiceNotifications(prefs.getBoolean(DeviceSettingsPreferenceConst.PREF_SONY_WH1000XM3_NOTIFICATION_VOICE_GUIDE, true));
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default:
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LOG.warn("Unknown config '{}'", config);
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}
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return super.encodeSendConfiguration(config);
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}
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2021-11-16 23:17:44 +01:00
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public byte[] encodeAck() {
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return encodeMessage(
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MSG_TYPE_ACK,
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new byte[]{}
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);
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}
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2021-10-31 16:01:50 +01:00
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public byte[] encodeTriggerNoiseCancellingOptimizer() {
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// This successfully triggers the noise cancelling optimizer. However, we don't get the
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// optimization progress messages.
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2021-11-16 23:17:44 +01:00
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return encodeMessage(
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(byte) 0x0c,
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new byte[]{(byte) 0x84, (byte) 0x01, (byte) 0x00, (byte) 0x01}
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);
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}
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private byte[] encodeSoundControl(AmbientSoundControl ambientSoundControl, boolean focusOnVoice, int ambientSound) {
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if (ambientSound < 0 || ambientSound > 19) {
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throw new IllegalArgumentException("Level must be between 0 and 19");
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}
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ByteBuffer buf = ByteBuffer.allocate(14);
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buf.order(ByteOrder.BIG_ENDIAN);
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buf.put((byte) 0x0c);
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buf.put(sequenceNumber);
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buf.putInt(8);
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buf.put((byte) 0x68);
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buf.put((byte) 0x02);
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if (AmbientSoundControl.OFF.equals(ambientSoundControl)) {
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buf.put((byte) 0x00);
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} else {
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buf.put((byte) 0x11);
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}
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buf.put((byte) 0x01);
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switch (ambientSoundControl) {
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case NOISE_CANCELLING:
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buf.put((byte) 2);
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break;
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case WIND_NOISE_REDUCTION:
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buf.put((byte) 1);
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|
|
|
break;
|
|
|
|
case OFF:
|
|
|
|
case AMBIENT_SOUND:
|
|
|
|
default:
|
|
|
|
buf.put((byte) 0);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
buf.put((byte) 0x01);
|
|
|
|
buf.put((byte) (focusOnVoice ? 0x01 : 0x00));
|
|
|
|
buf.put((byte) (ambientSound + 1));
|
|
|
|
|
|
|
|
return encodeMessage(buf.array());
|
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] encodeSoundPosition(SoundPosition position) {
|
2021-11-16 23:17:44 +01:00
|
|
|
return encodeMessage(
|
|
|
|
(byte) 0x0c,
|
|
|
|
new byte[]{(byte) 0x48, CMD_SOUND_POSITION, position.code}
|
|
|
|
);
|
2021-10-31 16:01:50 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] encodeSurroundMode(SurroundMode mode) {
|
2021-11-16 23:17:44 +01:00
|
|
|
return encodeMessage(
|
|
|
|
(byte) 0x0c,
|
|
|
|
new byte[]{(byte) 0x48, CMD_SOUND_SURROUND, mode.code}
|
|
|
|
);
|
2021-10-31 16:01:50 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] encodeEqualizerPreset(EqualizerPreset preset) {
|
2021-11-16 23:17:44 +01:00
|
|
|
return encodeMessage(
|
|
|
|
(byte) 0x0c,
|
|
|
|
new byte[]{(byte) 0x58, (byte) 0x01, preset.code[0], preset.code[1]}
|
|
|
|
);
|
2021-10-31 16:01:50 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] encodeEqualizerCustomBands(EqualizerPreset preset, EqualizerPreset previousPreset, EqualizerCustomBands equalizer) {
|
|
|
|
ByteArrayOutputStream cmdStream = new ByteArrayOutputStream(16);
|
|
|
|
|
|
|
|
try {
|
|
|
|
if (preset != previousPreset) {
|
|
|
|
// If we're not on the preset that is being changed, we need to swap to it
|
|
|
|
cmdStream.write(encodeEqualizerPreset(preset));
|
|
|
|
}
|
|
|
|
|
|
|
|
cmdStream.write(encodeEqualizerCustomBands(equalizer));
|
|
|
|
} catch (IOException e) {
|
|
|
|
LOG.error("This should never happen", e);
|
|
|
|
}
|
|
|
|
|
|
|
|
return cmdStream.toByteArray();
|
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] encodeEqualizerCustomBands(EqualizerCustomBands equalizer) {
|
2021-11-16 23:17:44 +01:00
|
|
|
final ByteBuffer buf = ByteBuffer.allocate(10);
|
2021-10-31 16:01:50 +01:00
|
|
|
|
|
|
|
buf.put((byte) 0x58);
|
|
|
|
buf.put((byte) 0x01);
|
|
|
|
buf.put((byte) 0xff);
|
|
|
|
buf.put((byte) 0x06);
|
|
|
|
|
|
|
|
buf.put((byte) (equalizer.getClearBass() + 10));
|
|
|
|
for (final Integer band : equalizer.getBands()) {
|
|
|
|
buf.put((byte) (band + 10));
|
|
|
|
}
|
|
|
|
|
2021-11-16 23:17:44 +01:00
|
|
|
return encodeMessage(
|
|
|
|
(byte) 0x0c,
|
|
|
|
buf.array()
|
|
|
|
);
|
2021-10-31 16:01:50 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] encodeDSEEHX(boolean enabled) {
|
2021-11-16 23:17:44 +01:00
|
|
|
return encodeMessage(
|
|
|
|
(byte) 0x0c,
|
|
|
|
new byte[]{(byte) 0xe8, (byte) 0x02, (byte) 0x00, (byte) (enabled ? 0x01 : 0x00)}
|
|
|
|
);
|
2021-10-31 16:01:50 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] encodeTouchSensor(boolean enabled) {
|
2021-11-16 23:17:44 +01:00
|
|
|
return encodeMessage(
|
|
|
|
(byte) 0x0c,
|
|
|
|
new byte[]{(byte) 0xd8, (byte) 0xd2, (byte) 0x01, (byte) (enabled ? 0x01 : 0x00)}
|
|
|
|
);
|
2021-10-31 16:01:50 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] encodeAutomaticPowerOff(AutomaticPowerOff automaticPowerOff) {
|
2021-11-16 23:17:44 +01:00
|
|
|
return encodeMessage(
|
|
|
|
(byte) 0x0c,
|
|
|
|
new byte[]{(byte) 0xf8, (byte) 0x04, (byte) 0x01, automaticPowerOff.code[0], automaticPowerOff.code[1]}
|
|
|
|
);
|
2021-10-31 16:01:50 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] encodeVoiceNotifications(boolean enabled) {
|
2021-11-16 23:17:44 +01:00
|
|
|
return encodeMessage(
|
|
|
|
(byte) 0x0e,
|
|
|
|
new byte[]{(byte) 0x48, (byte) 0x01, (byte) 0x01, (byte) (enabled ? 0x01 : 0x00)}
|
|
|
|
);
|
|
|
|
}
|
2021-10-31 16:01:50 +01:00
|
|
|
|
2021-11-16 23:17:44 +01:00
|
|
|
private byte[] encodeMessage(byte type, byte[] content) {
|
|
|
|
ByteBuffer buf = ByteBuffer.allocate(content.length + 6);
|
|
|
|
buf.order(ByteOrder.BIG_ENDIAN);
|
2021-10-31 16:01:50 +01:00
|
|
|
|
2021-11-16 23:17:44 +01:00
|
|
|
buf.put(type);
|
2021-11-16 23:56:38 +01:00
|
|
|
buf.put(sequenceNumber);
|
2021-11-16 23:17:44 +01:00
|
|
|
buf.putInt(content.length);
|
|
|
|
buf.put(content);
|
2021-10-31 16:01:50 +01:00
|
|
|
|
|
|
|
return encodeMessage(buf.array());
|
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] encodeMessage(byte[] message) {
|
|
|
|
ByteArrayOutputStream cmdStream = new ByteArrayOutputStream(message.length + 2);
|
|
|
|
|
|
|
|
cmdStream.write(PACKET_HEADER);
|
|
|
|
|
|
|
|
byte checksum = calcChecksum(message, false);
|
|
|
|
|
|
|
|
try {
|
|
|
|
cmdStream.write(escape(message));
|
|
|
|
cmdStream.write(escape(new byte[]{checksum}));
|
|
|
|
} catch (IOException e) {
|
|
|
|
LOG.error("This should never happen", e);
|
|
|
|
}
|
|
|
|
|
|
|
|
cmdStream.write(PACKET_TRAILER);
|
|
|
|
|
|
|
|
return cmdStream.toByteArray();
|
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] escape(byte[] bytes) {
|
|
|
|
ByteArrayOutputStream escapedStream = new ByteArrayOutputStream(bytes.length);
|
|
|
|
|
|
|
|
for (byte b : bytes) {
|
|
|
|
switch (b) {
|
|
|
|
case PACKET_HEADER:
|
|
|
|
case PACKET_TRAILER:
|
|
|
|
case PACKET_ESCAPE:
|
|
|
|
escapedStream.write(PACKET_ESCAPE);
|
|
|
|
escapedStream.write(b & PACKET_ESCAPE_MASK);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
escapedStream.write(b);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return escapedStream.toByteArray();
|
|
|
|
}
|
|
|
|
|
|
|
|
private byte[] unescape(byte[] bytes) {
|
|
|
|
ByteArrayOutputStream unescapedStream = new ByteArrayOutputStream(bytes.length);
|
|
|
|
|
|
|
|
for (int i = 0; i < bytes.length; i++) {
|
|
|
|
byte b = bytes[i];
|
|
|
|
if (b == PACKET_ESCAPE) {
|
|
|
|
if (++i >= bytes.length) {
|
|
|
|
throw new IllegalArgumentException("Invalid escape character at end of array");
|
|
|
|
}
|
|
|
|
unescapedStream.write(b & ~PACKET_ESCAPE_MASK);
|
|
|
|
} else {
|
|
|
|
unescapedStream.write(b);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return unescapedStream.toByteArray();
|
|
|
|
}
|
|
|
|
|
|
|
|
public byte calcChecksum(byte[] message, boolean ignoreLastByte) {
|
|
|
|
int chk = 0;
|
|
|
|
for (int i = 0; i < message.length - (ignoreLastByte ? 1 : 0); i++) {
|
|
|
|
chk += message[i] & 255;
|
|
|
|
}
|
|
|
|
return (byte) chk;
|
|
|
|
}
|
|
|
|
}
|