diff --git a/org.eclipse.jgit/.settings/.api_filters b/org.eclipse.jgit/.settings/.api_filters
index a1ffe91..2a4fc54 100644
--- a/org.eclipse.jgit/.settings/.api_filters
+++ b/org.eclipse.jgit/.settings/.api_filters
@@ -65,6 +65,30 @@
         </filter>
         <filter id="1142947843">
             <message_arguments>
+                <message_argument value="5.1.13"/>
+                <message_argument value="CONFIG_KEY_PACKED_GIT_LIMIT"/>
+            </message_arguments>
+        </filter>
+        <filter id="1142947843">
+            <message_arguments>
+                <message_argument value="5.1.13"/>
+                <message_argument value="CONFIG_KEY_PACKED_GIT_MMAP"/>
+            </message_arguments>
+        </filter>
+        <filter id="1142947843">
+            <message_arguments>
+                <message_argument value="5.1.13"/>
+                <message_argument value="CONFIG_KEY_PACKED_GIT_OPENFILES"/>
+            </message_arguments>
+        </filter>
+        <filter id="1142947843">
+            <message_arguments>
+                <message_argument value="5.1.13"/>
+                <message_argument value="CONFIG_KEY_PACKED_GIT_WINDOWSIZE"/>
+            </message_arguments>
+        </filter>
+        <filter id="1142947843">
+            <message_arguments>
                 <message_argument value="5.1.9"/>
                 <message_argument value="CONFIG_FILESYSTEM_SECTION"/>
             </message_arguments>
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
index 7877391..9d1c73b 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
@@ -230,6 +230,30 @@
 	/** The "streamFileThreshold" key */
 	public static final String CONFIG_KEY_STREAM_FILE_TRESHOLD = "streamFileThreshold";
 
+	/**
+	 * The "packedGitMmap" key
+	 * @since 5.1.13
+	 */
+	public static final String CONFIG_KEY_PACKED_GIT_MMAP = "packedgitmmap";
+
+	/**
+	 * The "packedGitWindowSize" key
+	 * @since 5.1.13
+	 */
+	public static final String CONFIG_KEY_PACKED_GIT_WINDOWSIZE = "packedgitwindowsize";
+
+	/**
+	 * The "packedGitLimit" key
+	 * @since 5.1.13
+	 */
+	public static final String CONFIG_KEY_PACKED_GIT_LIMIT = "packedgitlimit";
+
+	/**
+	 * The "packedGitOpenFiles" key
+	 * @since 5.1.13
+	 */
+	public static final String CONFIG_KEY_PACKED_GIT_OPENFILES = "packedgitopenfiles";
+
 	/** The "remote" key */
 	public static final String CONFIG_KEY_REMOTE = "remote";
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/WindowCacheConfig.java b/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/WindowCacheConfig.java
index c2e6a42..c04b677 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/WindowCacheConfig.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/WindowCacheConfig.java
@@ -43,6 +43,14 @@
 
 package org.eclipse.jgit.storage.file;
 
+import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_CORE_SECTION;
+import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_DELTA_BASE_CACHE_LIMIT;
+import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_PACKED_GIT_LIMIT;
+import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_PACKED_GIT_MMAP;
+import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_PACKED_GIT_OPENFILES;
+import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_PACKED_GIT_WINDOWSIZE;
+import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_STREAM_FILE_TRESHOLD;
+
 import org.eclipse.jgit.internal.storage.file.WindowCache;
 import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.storage.pack.PackConfig;
@@ -227,20 +235,20 @@
 	 * @since 3.0
 	 */
 	public WindowCacheConfig fromConfig(Config rc) {
-		setPackedGitOpenFiles(rc.getInt(
-				"core", null, "packedgitopenfiles", getPackedGitOpenFiles())); //$NON-NLS-1$ //$NON-NLS-2$
-		setPackedGitLimit(rc.getLong(
-				"core", null, "packedgitlimit", getPackedGitLimit())); //$NON-NLS-1$ //$NON-NLS-2$
-		setPackedGitWindowSize(rc.getInt(
-				"core", null, "packedgitwindowsize", getPackedGitWindowSize())); //$NON-NLS-1$ //$NON-NLS-2$
-		setPackedGitMMAP(rc.getBoolean(
-				"core", null, "packedgitmmap", isPackedGitMMAP())); //$NON-NLS-1$ //$NON-NLS-2$
-		setDeltaBaseCacheLimit(rc.getInt(
-				"core", null, "deltabasecachelimit", getDeltaBaseCacheLimit())); //$NON-NLS-1$ //$NON-NLS-2$
+		setPackedGitOpenFiles(rc.getInt(CONFIG_CORE_SECTION, null,
+				CONFIG_KEY_PACKED_GIT_OPENFILES, getPackedGitOpenFiles()));
+		setPackedGitLimit(rc.getLong(CONFIG_CORE_SECTION, null,
+				CONFIG_KEY_PACKED_GIT_LIMIT, getPackedGitLimit()));
+		setPackedGitWindowSize(rc.getInt(CONFIG_CORE_SECTION, null,
+				CONFIG_KEY_PACKED_GIT_WINDOWSIZE, getPackedGitWindowSize()));
+		setPackedGitMMAP(rc.getBoolean(CONFIG_CORE_SECTION, null,
+				CONFIG_KEY_PACKED_GIT_MMAP, isPackedGitMMAP()));
+		setDeltaBaseCacheLimit(rc.getInt(CONFIG_CORE_SECTION, null,
+				CONFIG_KEY_DELTA_BASE_CACHE_LIMIT, getDeltaBaseCacheLimit()));
 
 		long maxMem = Runtime.getRuntime().maxMemory();
-		long sft = rc.getLong(
-				"core", null, "streamfilethreshold", getStreamFileThreshold()); //$NON-NLS-1$ //$NON-NLS-2$
+		long sft = rc.getLong(CONFIG_CORE_SECTION, null,
+				CONFIG_KEY_STREAM_FILE_TRESHOLD, getStreamFileThreshold());
 		sft = Math.min(sft, maxMem / 4); // don't use more than 1/4 of the heap
 		sft = Math.min(sft, Integer.MAX_VALUE); // cannot exceed array length
 		setStreamFileThreshold((int) sft);
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/AbstractTreeIterator.java b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/AbstractTreeIterator.java
index 335abe1..a3c93cf 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/AbstractTreeIterator.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/AbstractTreeIterator.java
@@ -239,12 +239,10 @@
 		path = p.path;
 		pathOffset = p.pathLen + 1;
 
-		try {
-			path[pathOffset - 1] = '/';
-		} catch (ArrayIndexOutOfBoundsException e) {
+		if (pathOffset > path.length) {
 			growPath(p.pathLen);
-			path[pathOffset - 1] = '/';
 		}
+		path[pathOffset - 1] = '/';
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/CanonicalTreeParser.java b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/CanonicalTreeParser.java
index 0199688..b2d8fc3 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/CanonicalTreeParser.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/CanonicalTreeParser.java
@@ -387,14 +387,13 @@
 		tmp = pathOffset;
 		for (;; tmp++) {
 			c = raw[ptr++];
-			if (c == 0)
+			if (c == 0) {
 				break;
-			try {
-				path[tmp] = c;
-			} catch (ArrayIndexOutOfBoundsException e) {
-				growPath(tmp);
-				path[tmp] = c;
 			}
+			if (tmp >= path.length) {
+				growPath(tmp);
+			}
+			path[tmp] = c;
 		}
 		pathLen = tmp;
 		nextPtr = ptr + OBJECT_ID_LENGTH;