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Code Releases Wiki Activity

Garmin: Fix rxnetworks AGPS header recognition

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This commit is contained in:
José Rebelo 2024-10-09 19:01:59 +01:00
parent 94572805e9
commit d782169a64
1 changed files with 21 additions and 1 deletions
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22
app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/garmin/agps/GarminAgpsFile.java
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@ -5,6 +5,8 @@ import org.slf4j.LoggerFactory;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import java.util.zip.GZIPInputStream;
@ -18,7 +20,7 @@ public class GarminAgpsFile {
private final byte[] bytes;
public static final byte[] GZ_HEADER = new byte[]{(byte) 0x1f, (byte) 0x8b};
public static final byte[] CPE_RXNETWORKS_HEADER = new byte[]{(byte) 0x01, (byte) 0x00, (byte) 0x66};
public static final byte[] CPE_RXNETWORKS_HEADER = new byte[]{(byte) 0x01, (byte) 0x00};
public static final byte[] CPE_SONY_HEADER = new byte[]{(byte) 0x2a, (byte) 0x12, (byte) 0xa0, (byte) 0x02};
public GarminAgpsFile(final byte[] bytes) {
@ -59,6 +61,24 @@ public class GarminAgpsFile {
LOG.error("Header in gz file is not agps rxnetworks: {}", GB.hexdump(header));
return false;
}
final byte[] timestampBytes = new byte[4];
read = gzis.read(timestampBytes);
if (read != timestampBytes.length) {
LOG.error("Failed to read rxnetworks timestamp");
return false;
}
final int agpsTimestamp = ByteBuffer.wrap(timestampBytes).order(ByteOrder.BIG_ENDIAN).getInt();
final int currentTimestamp = (int) (System.currentTimeMillis() / 1000L);
final int agpsAge = currentTimestamp - agpsTimestamp;
if (agpsAge < 0) {
LOG.error("rxnetworks AGPS timestamp {} is in the future", agpsTimestamp);
return false;
}
if (agpsAge > 604800) {
LOG.error("rxnetworks AGPS timestamp {} is older than 7 days", agpsTimestamp);
return false;
}
LOG.debug("rx networks AGPS age: {}", agpsAge);
return true;
} catch (final IOException e) {
LOG.error("Failed to decompress file as gzip", e);