From bd1ac1e94b4aeed09091309d20eb116e267faca7 Mon Sep 17 00:00:00 2001
From: rusEfi <russianefi@gmail.com>
Date: Sat, 7 Mar 2015 15:04:54 -0600
Subject: [PATCH] auto-sync

---
 .../io/src/com/rusefi/ConfigurationImage.java | 23 ++++++++--
 .../com/rusefi/ConfigurationImageDiff.java    | 34 +++++++++++++++
 .../test/ConfigurationImageDiffTest.java      | 42 +++++++++++++++++++
 3 files changed, 96 insertions(+), 3 deletions(-)
 create mode 100644 java_console/io/src/com/rusefi/ConfigurationImageDiff.java
 create mode 100644 java_console/io/src/com/rusefi/test/ConfigurationImageDiffTest.java

diff --git a/java_console/io/src/com/rusefi/ConfigurationImage.java b/java_console/io/src/com/rusefi/ConfigurationImage.java
index cb8fbbe099..53a150afec 100644
--- a/java_console/io/src/com/rusefi/ConfigurationImage.java
+++ b/java_console/io/src/com/rusefi/ConfigurationImage.java
@@ -1,7 +1,9 @@
 package com.rusefi;
 
+import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.util.Arrays;
 
 /**
  * (c) Andrey Belomutskiy
@@ -9,16 +11,19 @@ import java.io.IOException;
  */
 public class ConfigurationImage {
     private final static String BIN_HEADER = "RUSEFI0.1";
-    private final int size;
     private byte content[];
 
     public ConfigurationImage(int size) {
-        this.size = size;
         content = new byte[size];
     }
 
+    public ConfigurationImage(byte[] content) {
+        this.content = content;
+    }
+
+
     public int getSize() {
-        return size;
+        return content.length;
     }
 
     public void saveToFile(String fileName) throws IOException {
@@ -32,6 +37,18 @@ public class ConfigurationImage {
         System.out.println("Saved to " + fileName);
     }
 
+    public boolean readFromFile(String fileName) throws IOException {
+        FileInputStream fis = new FileInputStream(fileName);
+        byte[] header = new byte[BIN_HEADER.length()];
+        int result = fis.read(header);
+        if (result != header.length)
+            return false;
+        if (!Arrays.equals(header, BIN_HEADER.getBytes()))
+            return false;
+        result = fis.read(content);
+        return result == content.length;
+    }
+
     public byte[] getContent() {
         return content;
     }
diff --git a/java_console/io/src/com/rusefi/ConfigurationImageDiff.java b/java_console/io/src/com/rusefi/ConfigurationImageDiff.java
new file mode 100644
index 0000000000..2da71cda65
--- /dev/null
+++ b/java_console/io/src/com/rusefi/ConfigurationImageDiff.java
@@ -0,0 +1,34 @@
+package com.rusefi;
+
+import com.rusefi.core.Pair;
+
+/**
+ * (c) Andrey Belomutskiy
+ * 3/6/2015
+ */
+public class ConfigurationImageDiff {
+    public static Pair<Integer, Integer> findDifferences(ConfigurationImage image1, ConfigurationImage image2, int position) {
+        byte[] c1 = image1.getContent();
+        byte[] c2 = image2.getContent();
+        int length = c1.length;
+        if (length != c2.length)
+            throw new IllegalArgumentException("Length mismatch");
+
+        while (position < length && c1[position] == c2[position])
+            position++;
+        if (position == length)
+            return null; // no difference
+
+        int startOfDiff = position;
+        int prevDiff = position;
+
+        while (position - prevDiff < 4 && position < length) {
+            if (c1[position] != c2[position]) {
+                prevDiff = position;
+            }
+            position++;
+        }
+
+        return new Pair<>(startOfDiff, position);
+    }
+}
diff --git a/java_console/io/src/com/rusefi/test/ConfigurationImageDiffTest.java b/java_console/io/src/com/rusefi/test/ConfigurationImageDiffTest.java
new file mode 100644
index 0000000000..335a9dbb93
--- /dev/null
+++ b/java_console/io/src/com/rusefi/test/ConfigurationImageDiffTest.java
@@ -0,0 +1,42 @@
+package com.rusefi.test;
+
+import com.rusefi.ConfigurationImage;
+import com.rusefi.core.Pair;
+import org.junit.Test;
+
+import static com.rusefi.ConfigurationImageDiff.findDifferences;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * (c) Andrey Belomutskiy
+ * 3/6/2015
+ */
+public class ConfigurationImageDiffTest {
+    @Test
+    public void testCompare() {
+        {
+            byte[] data1 = {1, 2, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6};
+            byte[] data2 = {1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 1, 2, 3, 4, 5, 6};
+            Pair<Integer, Integer> p = findDifferences(new ConfigurationImage(data1), new ConfigurationImage(data2), 0);
+            assertNotNull(p);
+            assertEquals(5, (int) p.first);
+            assertEquals(15, (int) p.second);
+        }
+        {
+            byte[] data1 = {1, 2, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6};
+            byte[] data2 = {1, 2, 3, 4, 5, 6, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6};
+            Pair<Integer, Integer> p = findDifferences(new ConfigurationImage(data1), new ConfigurationImage(data2), 0);
+            assertNotNull(p);
+            assertEquals(5, (int) p.first);
+            assertEquals(9, (int) p.second);
+        }
+        {
+            byte[] data1 = {1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 1, 0, 0, 0, 0, 0};
+            byte[] data2 = {1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 1, 2, 3, 4, 5, 6};
+            Pair<Integer, Integer> p = findDifferences(new ConfigurationImage(data1), new ConfigurationImage(data2), 0);
+            assertEquals(13, (int) p.first);
+            assertEquals(18, (int) p.second);
+        }
+    }
+}