altoslib: Clean up GPS DOP support in AltosState

Parse out hdop/pdop/vdop from telem and eeprom. Deal with legacy
eeprom files that have dop/100 instead of dop/10 values.

Clear state DOP values to MISSING at startup

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

1 files changed, 25 insertions, 0 deletions

diff --git a/altoslib/AltosLib.java b/altoslib/AltosLib.java
index c2ec0e3b..eb188d6b 100644
--- a/altoslib/AltosLib.java
+++ b/altoslib/AltosLib.java
@@ -215,6 +215,31 @@ public class AltosLib {
 								 telemetry));
 	}
 
+	private static int[] split_version(String version) {
+		String[] tokens = version.split("\\.");
+		int[] ret = new int[tokens.length];
+		for (int i = 0; i < tokens.length; i++)
+			ret[i] = Integer.parseInt(tokens[i]);
+		return ret;
+	}
+
+	public static int compare_version(String version_a, String version_b) {
+		int[] a = split_version(version_a);
+		int[] b = split_version(version_b);
+
+		for (int i = 0; i < Math.min(a.length, b.length); i++) {
+			if (a[i] < b[i])
+				return -1;
+			if (a[i] > b[i])
+				return 1;
+		}
+		if (a.length < b.length)
+			return -1;
+		if (a.length > b.length)
+			return 1;
+		return 0;
+	}
+
 	private static String[] state_to_string = {
 		"startup",
 		"idle",