altosui: Mark empty eeprom records 'invalid', don't generate exception

When reading empty eeprom records, mark them as 'invalid', but don't
generate an exception as it's normal to read these at the end of the
flight log.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 13 insertions, 4 deletions

diff --git a/altosui/AltosEepromRecord.java b/altosui/AltosEepromRecord.java
index 584a04b7..e5196c50 100644
--- a/altosui/AltosEepromRecord.java
+++ b/altosui/AltosEepromRecord.java
@@ -72,15 +72,24 @@ public class AltosEepromRecord {
 		if (values[0] != (addr & 0xff))
 			throw new ParseException(String.format("data address out of sync at 0x%x",
 							       addr), 0);
-		if (checksum(values) != 0)
-			throw new ParseException(String.format("invalid checksum at 0x%x", addr), 0);
-
+		int i;
+		for (i = 1; i < values.length; i++)
+			if (values[i] != 0xff)
+				break;
 		cmd = values[1];
+		tick_valid = true;
+		if (i != values.length) {
+			if (checksum(values) != 0)
+				throw new ParseException(String.format("invalid checksum at 0x%x in line %s", addr, line), 0);
+		} else {
+			cmd = Altos.AO_LOG_INVALID;
+			tick_valid = false;
+		}
+
 		tick = values[3] + (values[4] << 8);
 		a = values[5] + (values[6] << 8);
 		b = values[7] + (values[8] << 8);
 		data = null;
-		tick_valid = true;
 	}
 
 	public AltosEepromRecord (String line) {