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Lefun: Fix checksum generation

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This commit is contained in:
Yukai Li 2020-10-04 20:59:24 -06:00 committed by Gitea
parent c7edfc0b54
commit 8662041e5a
1 changed files with 3 additions and 3 deletions
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6
app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/lefun/commands/BaseCommand.java
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@ -32,12 +32,12 @@ public abstract class BaseCommand {
abstract protected byte serializeParams(ByteBuffer params);
public void deserialize(byte[] response) {
if (response.length < LefunConstants.CMD_HEADER_LENGTH)
if (response.length < LefunConstants.CMD_HEADER_LENGTH || response.length < response[1])
throw new IllegalArgumentException("Response is too short");
if (calculateChecksum(response, 0, response.length - 1) != response[response.length - 1])
if (calculateChecksum(response, 0, response[1] - 1) != response[response[1] - 1])
throw new IllegalArgumentException("Incorrect message checksum");
ByteBuffer buffer = ByteBuffer.wrap(response, LefunConstants.CMD_HEADER_LENGTH - 1,
response.length - LefunConstants.CMD_HEADER_LENGTH);
response[1] - LefunConstants.CMD_HEADER_LENGTH);
buffer.order(ByteOrder.BIG_ENDIAN);
deserializeParams(response[2], buffer);
}