115 lines
3.4 KiB
Java
115 lines
3.4 KiB
Java
/* Copyright (C) 2017-2022 Andreas Shimokawa, 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.huami;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.util.Map;
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import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
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import nodomain.freeyourgadget.gadgetbridge.util.ArrayUtils;
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import nodomain.freeyourgadget.gadgetbridge.util.CheckSums;
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public abstract class AbstractHuamiFirmwareInfo {
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private byte[] bytes;
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private final int crc16;
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private final int crc32;
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protected final HuamiFirmwareType firmwareType;
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public AbstractHuamiFirmwareInfo(byte[] bytes) {
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this.bytes = bytes;
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this.crc16 = CheckSums.getCRC16(bytes);
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this.crc32 = CheckSums.getCRC32(bytes);
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this.firmwareType = determineFirmwareType(bytes);
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}
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public boolean isHeaderValid() {
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return getFirmwareType() != HuamiFirmwareType.INVALID;
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}
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public void checkValid() throws IllegalArgumentException {
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}
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public int[] getWhitelistedVersions() {
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return ArrayUtils.toIntArray(getCrcMap().keySet());
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}
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/**
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* @return the size of the firmware in number of bytes.
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*/
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public int getSize() {
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return bytes.length;
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}
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public byte[] getBytes() {
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return bytes;
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}
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public int getCrc16() {
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return crc16;
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}
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public int getCrc32() {
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return crc32;
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}
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public int getFirmwareVersion() {
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return getCrc16(); // HACK until we know how to determine the version from the fw bytes
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}
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public HuamiFirmwareType getFirmwareType() {
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return firmwareType;
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}
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public void unsetFwBytes() {
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this.bytes = null;
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}
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public abstract String toVersion(int crc16);
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public abstract boolean isGenerallyCompatibleWith(GBDevice device);
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protected abstract Map<Integer, String> getCrcMap();
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protected abstract HuamiFirmwareType determineFirmwareType(byte[] bytes);
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public static boolean searchString32BitAligned(byte[] fwbytes, String findString) {
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ByteBuffer stringBuf = ByteBuffer.wrap((findString + "\0").getBytes());
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stringBuf.order(ByteOrder.BIG_ENDIAN);
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int[] findArray = new int[stringBuf.remaining() / 4];
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for (int i = 0; i < findArray.length; i++) {
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findArray[i] = stringBuf.getInt();
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}
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ByteBuffer buf = ByteBuffer.wrap(fwbytes);
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buf.order(ByteOrder.BIG_ENDIAN);
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while (buf.remaining() > 3) {
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int arrayPos = 0;
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while (arrayPos < findArray.length && buf.remaining() > 3 && (buf.getInt() == findArray[arrayPos])) {
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arrayPos++;
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}
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if (arrayPos == findArray.length) {
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return true;
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}
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}
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return false;
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}
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}
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