[JGIT PATCH 3/3] Don't permit '.' or '..' in tree entries

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

A Git tree must not have '.' or '..' within the structure as these
names are reserved in every directory by the client operating system.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 .../org/spearce/jgit/lib/ObjectCheckerTest.java    |   31 ++++++++++++++++++++
 .../src/org/spearce/jgit/lib/ObjectChecker.java    |    7 ++++
 2 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/org.spearce.jgit.test/tst/org/spearce/jgit/lib/ObjectCheckerTest.java b/org.spearce.jgit.test/tst/org/spearce/jgit/lib/ObjectCheckerTest.java
index fa37fb5..7befde8 100644
--- a/org.spearce.jgit.test/tst/org/spearce/jgit/lib/ObjectCheckerTest.java
+++ b/org.spearce.jgit.test/tst/org/spearce/jgit/lib/ObjectCheckerTest.java
@@ -980,6 +980,13 @@ public void testValidTree5() throws CorruptObjectException {
 		checker.checkTree(data);
 	}
 
+	public void testValidTree6() throws CorruptObjectException {
+		final StringBuilder b = new StringBuilder();
+		entry(b, "100644 .a");
+		final byte[] data = Constants.encodeASCII(b.toString());
+		checker.checkTree(data);
+	}
+
 	public void testValidTreeSorting1() throws CorruptObjectException {
 		final StringBuilder b = new StringBuilder();
 		entry(b, "100644 fooaaa");
@@ -1166,6 +1173,30 @@ public void testInvalidTreeNameIsEmpty() {
 		}
 	}
 
+	public void testInvalidTreeNameIsDot() {
+		final StringBuilder b = new StringBuilder();
+		entry(b, "100644 .");
+		final byte[] data = Constants.encodeASCII(b.toString());
+		try {
+			checker.checkTree(data);
+			fail("incorrectly accepted an invalid tree");
+		} catch (CorruptObjectException e) {
+			assertEquals("invalid name '.'", e.getMessage());
+		}
+	}
+
+	public void testInvalidTreeNameIsDotDot() {
+		final StringBuilder b = new StringBuilder();
+		entry(b, "100644 ..");
+		final byte[] data = Constants.encodeASCII(b.toString());
+		try {
+			checker.checkTree(data);
+			fail("incorrectly accepted an invalid tree");
+		} catch (CorruptObjectException e) {
+			assertEquals("invalid name '..'", e.getMessage());
+		}
+	}
+
 	public void testInvalidTreeTruncatedInName() {
 		final StringBuilder b = new StringBuilder();
 		b.append("100644 b");
diff --git a/org.spearce.jgit/src/org/spearce/jgit/lib/ObjectChecker.java b/org.spearce.jgit/src/org/spearce/jgit/lib/ObjectChecker.java
index d403119..b303d6f 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/lib/ObjectChecker.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/lib/ObjectChecker.java
@@ -318,6 +318,13 @@ public void checkTree(final byte[] raw) throws CorruptObjectException {
 			}
 			if (thisNameB + 1 == ptr)
 				throw new CorruptObjectException("zero length name");
+			if (raw[thisNameB] == '.') {
+				final int nameLen = (ptr - 1) - thisNameB;
+				if (nameLen == 1)
+					throw new CorruptObjectException("invalid name '.'");
+				if (nameLen == 2 && raw[thisNameB + 1] == '.')
+					throw new CorruptObjectException("invalid name '..'");
+			}
 			if (duplicateName(raw, thisNameB, ptr - 1))
 				throw new CorruptObjectException("duplicate entry names");
 
-- 
1.6.0.3.756.gb776d