Merge pull request #60 from nightscout/hotfix/v3calcrecs

Hotfix to parse v3 Cal records

app/src/main/AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.nightscout.android"
-    android:versionCode="15"
-    android:versionName="0.1.9">
+    android:versionCode="16"
+    android:versionName="0.1.10">
 
     <uses-feature android:name="android.hardware.usb.host" />
 

app/src/main/java/com/nightscout/android/dexcom/CRCFailRuntimeException.java

@@ -1,7 +1,7 @@
 package com.nightscout.android.dexcom;
 
 public class CRCFailRuntimeException extends RuntimeException {
-    CRCFailRuntimeException(String message){
+    public CRCFailRuntimeException(String message){
         super(message);
     }
 }

app/src/main/java/com/nightscout/android/dexcom/Constants.java

@@ -50,6 +50,7 @@ public class Constants {
     public final static int EGV_TREND_ARROW_MASK = 15;
     public final static int EGV_NOISE_MASK = 112;
     public final static float MG_DL_TO_MMOL_L = 0.05556f;
+    public final static int CRC_LEN = 2;
 
     public enum BATTERY_STATES {
         NONE,

app/src/main/java/com/nightscout/android/dexcom/ReadData.java

@@ -6,6 +6,7 @@
 import com.nightscout.android.dexcom.records.EGVRecord;
 import com.nightscout.android.dexcom.records.GenericXMLRecord;
 import com.nightscout.android.dexcom.records.MeterRecord;
+import com.nightscout.android.dexcom.records.PageHeader;
 import com.nightscout.android.dexcom.records.SensorRecord;
 
 import org.w3c.dom.Element;
@@ -211,6 +212,7 @@ private ReadPacket read(int numOfBytes) {
 
     private <T> T ParsePage(byte[] data, int recordType) {
         int HEADER_LEN = 28;
+        PageHeader pageHeader=new PageHeader(data);
         int NUM_REC_OFFSET = 4;
         int numRec = data[NUM_REC_OFFSET];
         int rec_len;
@@ -244,7 +246,10 @@ private <T> T ParsePage(byte[] data, int recordType) {
                 }
                 return (T) meterRecords;
             case CAL_SET:
-                rec_len = 148;
+                rec_len = 249;
+                if (pageHeader.getRevision()<=2) {
+                    rec_len = 148;
+                }
                 CalRecord[] calRecords = new CalRecord[numRec];
                 for (int i = 0; i < numRec; i++) {
                     int startIdx = HEADER_LEN + rec_len * i;

app/src/main/java/com/nightscout/android/dexcom/records/CalRecord.java

@@ -1,19 +1,21 @@
 package com.nightscout.android.dexcom.records;
 
+import android.util.Log;
+
 import com.nightscout.android.TimeConstants;
 
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 
 public class CalRecord extends GenericTimestampRecord {
-
+    private static final String TAG = CalRecord.class.getSimpleName();
     private double slope;
     private double intercept;
     private double scale;
     private int[] unk = new int[3];
     private double decay;
     private int  numRecords;
-    private CalSubrecord[] calSubrecords = new CalSubrecord[6];
+    private CalSubrecord[] calSubrecords = new CalSubrecord[12];
     private int SUB_LEN = 17;
 
     public CalRecord(byte[] packet) {
@@ -29,6 +31,7 @@ public CalRecord(byte[] packet) {
         long displayTimeOffset = (getDisplayTime().getTime() - getSystemTime().getTime()) / TimeConstants.SEC_TO_MS;
         int start = 44;
         for (int i = 0; i < numRecords; i++) {
+            Log.d("CalDebug","Loop #"+i);
             byte[] temp = new byte[SUB_LEN];
             System.arraycopy(packet, start, temp, 0, temp.length);
             calSubrecords[i] = new CalSubrecord(temp, displayTimeOffset);

app/src/main/java/com/nightscout/android/dexcom/records/CalSubrecord.java

@@ -1,12 +1,15 @@
 package com.nightscout.android.dexcom.records;
 
+import android.util.Log;
+
 import com.nightscout.android.dexcom.Utils;
 
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.util.Date;
 
 public class CalSubrecord {
+    private static final String TAG = CalSubrecord.class.getSimpleName();
     private Date dateEntered;
     private int calBGL;
     private int calRaw;

app/src/main/java/com/nightscout/android/dexcom/records/GenericTimestampRecord.java

@@ -8,11 +8,11 @@
 
 public class GenericTimestampRecord {
 
-    private final int OFFSET_SYS_TIME = 0;
-    private final int OFFSET_DISPLAY_TIME = 4;
-    private Date systemTime;
-    private int systemTimeSeconds;
-    private Date displayTime;
+    protected final int OFFSET_SYS_TIME = 0;
+    protected final int OFFSET_DISPLAY_TIME = 4;
+    protected Date systemTime;
+    protected int systemTimeSeconds;
+    protected Date displayTime;
 
     public GenericTimestampRecord(byte[] packet) {
         systemTimeSeconds = ByteBuffer.wrap(packet).order(ByteOrder.LITTLE_ENDIAN).getInt(OFFSET_SYS_TIME);

app/src/main/java/com/nightscout/android/dexcom/records/MeterRecord.java

@@ -1,9 +1,7 @@
 package com.nightscout.android.dexcom.records;
 
-import java.io.Serializable;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
-import java.util.Arrays;
 
 public class MeterRecord extends GenericTimestampRecord {
 

app/src/main/java/com/nightscout/android/dexcom/records/PageHeader.java

@@ -0,0 +1,82 @@
+package com.nightscout.android.dexcom.records;
+
+import com.nightscout.android.dexcom.CRC16;
+import com.nightscout.android.dexcom.CRCFailRuntimeException;
+import com.nightscout.android.dexcom.Constants;
+import com.nightscout.android.dexcom.Utils;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.Arrays;
+
+public class PageHeader {
+    protected final int HEADER_SIZE=28;
+    protected final int FIRSTRECORDINDEX_OFFSET=0;
+    protected final int NUMRECS_OFFSET=4;
+    protected final int RECTYPE_OFFSET=8;
+    protected final int REV_OFFSET=9;
+    protected final int PAGENUMBER_OFFSET=10;
+    protected final int RESERVED2_OFFSET=14;
+    protected final int RESERVED3_OFFSET=18;
+    protected final int RESERVED4_OFFSET=22;
+
+    protected int firstRecordIndex;
+    protected int numOfRecords;
+    protected Constants.RECORD_TYPES recordType;
+    protected byte revision;
+    protected int pageNumber;
+    protected int reserved2;
+    protected int reserved3;
+    protected int reserved4;
+    protected byte[] crc=new byte[2];
+
+
+    public PageHeader(byte[] packet) {
+        firstRecordIndex = ByteBuffer.wrap(packet).order(ByteOrder.LITTLE_ENDIAN).getInt(FIRSTRECORDINDEX_OFFSET);
+        numOfRecords = ByteBuffer.wrap(packet).order(ByteOrder.LITTLE_ENDIAN).getInt(NUMRECS_OFFSET);
+        recordType = Constants.RECORD_TYPES.values()[packet[RECTYPE_OFFSET]];
+        revision = packet[REV_OFFSET];
+        pageNumber = ByteBuffer.wrap(packet).order(ByteOrder.LITTLE_ENDIAN).getInt(PAGENUMBER_OFFSET);
+        reserved2 = ByteBuffer.wrap(packet).order(ByteOrder.LITTLE_ENDIAN).getInt(RESERVED2_OFFSET);
+        reserved3 = ByteBuffer.wrap(packet).order(ByteOrder.LITTLE_ENDIAN).getInt(RESERVED3_OFFSET);
+        reserved4 = ByteBuffer.wrap(packet).order(ByteOrder.LITTLE_ENDIAN).getInt(RESERVED4_OFFSET);
+        System.arraycopy(packet,HEADER_SIZE-Constants.CRC_LEN,crc,0,Constants.CRC_LEN);
+        byte[] crc_calc = CRC16.calculate(packet,0,HEADER_SIZE - Constants.CRC_LEN);
+        if (!Arrays.equals(this.crc, crc_calc)) {
+            throw new CRCFailRuntimeException("CRC check failed: " + Utils.bytesToHex(this.crc) + " vs " + Utils.bytesToHex(crc_calc));
+        }
+
+    }
+
+    public byte getRevision() {
+        return revision;
+    }
+
+    public Constants.RECORD_TYPES getRecordType() {
+        return recordType;
+    }
+
+    public int getFirstRecordIndex() {
+        return firstRecordIndex;
+    }
+
+    public int getNumOfRecords() {
+        return numOfRecords;
+    }
+
+    public int getPageNumber() {
+        return pageNumber;
+    }
+
+    public int getReserved2() {
+        return reserved2;
+    }
+
+    public int getReserved3() {
+        return reserved3;
+    }
+
+    public int getReserved4() {
+        return reserved4;
+    }
+}