[JGIT PATCH 06/10] Reuse the magic tOc constant for pack index headers

["Shawn O. Pearce" <spearce@spearce.org>]

We need this constant to detect version 2 index files at read time,
but we also need it to create version 2 index files.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 .../src/org/spearce/jgit/lib/PackIndex.java        |    3 ++-
 .../src/org/spearce/jgit/lib/PackIndexWriter.java  |    3 +++
 2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/org.spearce.jgit/src/org/spearce/jgit/lib/PackIndex.java b/org.spearce.jgit/src/org/spearce/jgit/lib/PackIndex.java
index 3935d4f..ef4b13d 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/lib/PackIndex.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/lib/PackIndex.java
@@ -42,6 +42,7 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.Iterator;
 
 import org.spearce.jgit.util.NB;
@@ -104,7 +105,7 @@ public abstract class PackIndex implements Iterable<PackIndex.MutableEntry> {
 	}
 
 	private static boolean isTOC(final byte[] h) {
-		return h[0] == -1 && h[1] == 't' && h[2] == 'O' && h[3] == 'c';
+		return Arrays.equals(h, PackIndexWriter.TOC);
 	}
 
 	/**
diff --git a/org.spearce.jgit/src/org/spearce/jgit/lib/PackIndexWriter.java b/org.spearce.jgit/src/org/spearce/jgit/lib/PackIndexWriter.java
index 473e6cf..c9b27d2 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/lib/PackIndexWriter.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/lib/PackIndexWriter.java
@@ -55,6 +55,9 @@ import org.spearce.jgit.util.NB;
  * to the byte offset within the pack where the object's data can be read.
  */
 public abstract class PackIndexWriter {
+	/** Magic constant indicating post-version 1 format. */
+	protected static final byte[] TOC = { -1, 't', 'O', 'c' };
+
 	/**
 	 * Create a new writer for the oldest (most widely understood) format.
 	 * <p>
-- 
1.5.6.74.g8a5e