/* Copyright (C) 2022-2024 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 <https://www.gnu.org/licenses/>. */
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package nodomain.freeyourgadget.gadgetbridge.service.devices.huami;
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import androidx.annotation.Nullable;
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import org.apache.commons.lang3.ArrayUtils;
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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.ArrayList;
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import java.util.List;
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import nodomain.freeyourgadget.gadgetbridge.service.btle.BLETypeConversions;
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import nodomain.freeyourgadget.gadgetbridge.util.CheckSums;
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public class UIHHContainer {
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private static final Logger LOG = LoggerFactory.getLogger(UIHHContainer.class);
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public static final byte[] UIHH_HEADER = new byte[]{
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'U', 'I', 'H', 'H'
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};
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public List<FileEntry> files = new ArrayList<>();
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public List<FileEntry> getFiles() {
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return files;
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}
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public byte[] getFile(final FileType fileType) {
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for (final FileEntry file : files) {
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if (file.getType() == fileType) {
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return file.getContent();
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}
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}
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return null;
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}
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public void addFile(final FileType type, final byte[] bytes) {
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files.add(new FileEntry(type, bytes));
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}
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@Nullable
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public byte[] toRawBytes() {
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final ByteArrayOutputStream baos = new ByteArrayOutputStream();
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for (final FileEntry file : files) {
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try {
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baos.write(file.buildHeader());
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baos.write(file.getContent());
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} catch (final IOException e) {
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LOG.error("Failed to generate UIHH bytes", e);
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return null;
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}
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}
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final byte[] contentBytes = baos.toByteArray();
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final byte[] headerBytes = buildHeader(contentBytes);
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return ArrayUtils.addAll(headerBytes, contentBytes);
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}
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@Nullable
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public static UIHHContainer fromRawBytes(final byte[] bytes) {
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if (bytes.length < 32) {
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LOG.error("bytes array too small {}", bytes.length);
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return null;
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}
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if (!nodomain.freeyourgadget.gadgetbridge.util.ArrayUtils.startsWith(bytes, UIHH_HEADER)) {
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LOG.error("UIHH header not found");
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return null;
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}
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final int crc32 = BLETypeConversions.toUint32(ArrayUtils.subarray(bytes, 12, 12 + 4));
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final int length = BLETypeConversions.toUint32(ArrayUtils.subarray(bytes, 22, 22 + 4));
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if (length + 32 != bytes.length) {
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LOG.error("Length mismatch between header and bytes: {}/{}", length, bytes.length);
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return null;
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}
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if (crc32 != CheckSums.getCRC32(ArrayUtils.subarray(bytes, 32, bytes.length))) {
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LOG.error("CRC mismatch for content");
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return null;
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}
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int i = 32;
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final UIHHContainer ret = new UIHHContainer();
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while (i < bytes.length) {
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if (i + 10 >= bytes.length) {
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LOG.error("Not enough bytes remaining");
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return null;
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}
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if (bytes[i] != 1) {
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LOG.error("Expected 1 at position {}", i);
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return null;
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}
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i++;
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final FileType type = FileType.fromValue(bytes[i]);
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if (type == null) {
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LOG.error("Unknown type byte {} at position {}", String.format("0x%x", bytes[i], i));
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return null;
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}
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i++;
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final int fileLength = BLETypeConversions.toUint32(ArrayUtils.subarray(bytes, i, i + 4));
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i += 4;
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final int fileCrc32 = BLETypeConversions.toUint32(ArrayUtils.subarray(bytes, i, i + 4));
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i += 4;
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if (i + fileLength > bytes.length) {
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LOG.error("Not enough bytes remaining to read a {} byte file", fileLength);
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return null;
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}
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final byte[] fileContent = ArrayUtils.subarray(bytes, i, i + fileLength);
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if (fileCrc32 != CheckSums.getCRC32(fileContent)) {
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LOG.error("CRC mismatch for {}", type);
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return null;
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}
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i += fileLength;
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ret.getFiles().add(new FileEntry(type, fileContent));
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}
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return ret;
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}
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private static byte[] buildHeader(final byte[] content) {
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final ByteBuffer buf = ByteBuffer.allocate(32);
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buf.order(ByteOrder.LITTLE_ENDIAN);
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buf.put(UIHH_HEADER);
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buf.put(new byte[]{0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01});
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buf.putInt(CheckSums.getCRC32(content));
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buf.put(new byte[]{0x00, 0x00, 0x00, 0x00, 0x00, 0x00});
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buf.putInt(content.length);
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buf.put(new byte[]{0x00, 0x00, 0x00, 0x00, 0x00, 0x00});
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return buf.array();
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}
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public enum FileType {
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FIRMWARE_ZIP(HuamiFirmwareType.FIRMWARE.getValue(), "firmware.zip"),
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FIRMWARE_CHANGELOG(0x10, "changelog.txt"),
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GPS_ALM_BIN(HuamiFirmwareType.GPS_ALMANAC.getValue(), "gps_alm.bin"),
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GLN_ALM_BIN(0x0f, "gln_alm.bin"),
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LLE_BDS_LLE(0x86, "lle_bds.lle"),
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LLE_GPS_LLE(0x87, "lle_gps.lle"),
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LLE_GLO_LLE(0x88, "lle_glo.lle"),
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LLE_GAL_LLE(0x89, "lle_gal.lle"),
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LLE_QZSS_LLE(0x8a, "lle_qzss.lle"),
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AGPS_EPO_GR_3(-116, "EPO_GR_3.DAT"),
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AGPS_EPO_GAL_7(-115, "EPO_GAL_7.DAT"),
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AGPS_EPO_BDS_3(-114, "EPO_BDS_3.DAT"),
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;
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private final byte value;
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private final String name;
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FileType(final int value, final String name) {
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this.value = (byte) value;
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this.name = name;
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}
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public byte getValue() {
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return value;
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}
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public static FileType fromValue(final byte value) {
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for (final FileType fileType : values()) {
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if (fileType.getValue() == value) {
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return fileType;
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}
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}
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return null;
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}
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}
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public static class FileEntry {
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private final FileType type;
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private final byte[] content;
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public FileEntry(final FileType type, final byte[] content) {
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this.type = type;
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this.content = content;
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}
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public FileType getType() {
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return type;
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}
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public byte[] getContent() {
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return content;
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}
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public byte[] buildHeader() {
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final ByteBuffer buf = ByteBuffer.allocate(10);
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buf.order(ByteOrder.LITTLE_ENDIAN);
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buf.put((byte) 0x01);
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buf.put(type.getValue());
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buf.putInt(content.length);
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buf.putInt(CheckSums.getCRC32(content));
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return buf.array();
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}
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}
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}
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