Quickfix for AutoCRLF handling

CRLF only works for small files, where small is the size of the
buffer, i.e. about 8K. This QD fix reallocates the buffer to be
large enough.

Bug: 369780
Change-Id: Ifc34ad204fbf5986b257a5c616e4a8c601e8261a

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/AddCommandTest.java

@@ -111,7 +111,7 @@ public void testAddExistingSingleFile() throws IOException, NoFilepatternExcepti
 	}
 
 	@Test
-	public void testAddExistingSingleFileWithNewLine() throws IOException,
+	public void testAddExistingSingleSmallFileWithNewLine() throws IOException,
 			NoFilepatternException {
 		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
@@ -134,6 +134,35 @@ public void testAddExistingSingleFileWithNewLine() throws IOException,
 				indexState(CONTENT));
 	}
 
+	@Test
+	public void testAddExistingSingleMediumSizeFileWithNewLine()
+			throws IOException, NoFilepatternException {
+		File file = new File(db.getWorkTree(), "a.txt");
+		FileUtils.createNewFile(file);
+		StringBuilder data = new StringBuilder();
+		for (int i = 0; i < 1000; ++i) {
+			data.append("row1\r\nrow2");
+		}
+		String crData = data.toString();
+		PrintWriter writer = new PrintWriter(file);
+		writer.print(crData);
+		writer.close();
+		String lfData = data.toString().replaceAll("\r", "");
+		Git git = new Git(db);
+		db.getConfig().setString("core", null, "autocrlf", "false");
+		git.add().addFilepattern("a.txt").call();
+		assertEquals("[a.txt, mode:100644, content:" + data + "]",
+				indexState(CONTENT));
+		db.getConfig().setString("core", null, "autocrlf", "true");
+		git.add().addFilepattern("a.txt").call();
+		assertEquals("[a.txt, mode:100644, content:" + lfData + "]",
+				indexState(CONTENT));
+		db.getConfig().setString("core", null, "autocrlf", "input");
+		git.add().addFilepattern("a.txt").call();
+		assertEquals("[a.txt, mode:100644, content:" + lfData + "]",
+				indexState(CONTENT));
+	}
+
 	@Test
 	public void testAddExistingSingleBinaryFile() throws IOException,
 			NoFilepatternException {

org.eclipse.jgit/src/org/eclipse/jgit/lib/ObjectInserter.java

@@ -109,6 +109,29 @@ protected byte[] buffer() {
 		return tempBuffer;
 	}
 
+	static private final int tempBufSize;
+	static {
+		String s = System.getProperty("jgit.tempbufmaxsize");
+		if (s != null)
+			tempBufSize = Integer.parseInt(s);
+		else
+			tempBufSize = 1000000;
+	}
+
+	/**
+	 * @param hintSize
+	 * @return a temporary byte array for use by the caller
+	 */
+	protected byte[] buffer(long hintSize) {
+		if (hintSize >= tempBufSize)
+			tempBuffer = new byte[0];
+		else if (tempBuffer == null)
+			tempBuffer = new byte[(int) hintSize];
+		else if (tempBuffer.length < hintSize)
+			tempBuffer = new byte[(int) hintSize];
+		return tempBuffer;
+	}
+
 	/** @return digest to help compute an ObjectId */
 	protected MessageDigest digest() {
 		digest.reset();
@@ -172,7 +195,7 @@ public ObjectId idFor(int objectType, long length, InputStream in)
 		md.update((byte) ' ');
 		md.update(Constants.encodeASCII(length));
 		md.update((byte) 0);
-		byte[] buf = buffer();
+		byte[] buf = buffer(length);
 		while (length > 0) {
 			int n = in.read(buf, 0, (int) Math.min(length, buf.length));
 			if (n < 0)

org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsInserter.java

@@ -116,7 +116,7 @@ public ObjectId insert(int type, byte[] data, int off, int len)
 	@Override
 	public ObjectId insert(int type, long len, InputStream in)
 			throws IOException {
-		byte[] buf = buffer();
+		byte[] buf = buffer(len);
 		if (len <= buf.length) {
 			IO.readFully(in, buf, 0, (int) len);
 			return insert(type, buf, 0, (int) len);

org.eclipse.jgit/src/org/eclipse/jgit/storage/file/ObjectDirectoryInserter.java

@@ -95,8 +95,8 @@ public ObjectId insert(int type, byte[] data, int off, int len)
 	@Override
 	public ObjectId insert(final int type, long len, final InputStream is)
 			throws IOException {
-		if (len <= buffer().length) {
-			byte[] buf = buffer();
+		byte[] buf = buffer(len);
+		if (len <= buf.length) {
 			int actLen = IO.readFully(is, buf, 0);
 			return insert(type, buf, 0, actLen);