1 files changed, 151 insertions, 0 deletions
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoCRLFInputStream.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoCRLFInputStream.java
new file mode 100644
index 0000000000..2a353a58b9
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoCRLFInputStream.java
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2012, Robin Rosenberg
+ * Copyright (C) 2010, Marc Strapetz <marc.strapetz@syntevo.com>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.util.io;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.eclipse.jgit.diff.RawText;
+
+/**
+ * An OutputStream that expands LF to CRLF.
+ *
+ * Existing CRLF are not expanded to CRCRLF, but retained as is.
+ *
+ * Optionally, a binary check on the first 8000 bytes is performed and in case
+ * of binary files, canonicalization is turned off (for the complete file).
+ */
+public class AutoCRLFInputStream extends InputStream {
+	private final byte[] single = new byte[1];
+
+	private final byte[] buf = new byte[8096];
+
+	private final InputStream in;
+
+	private int cnt;
+
+	private int ptr;
+
+	private boolean isBinary;
+
+	private boolean detectBinary;
+
+	private byte last;
+
+	/**
+	 * Creates a new InputStream, wrapping the specified stream
+	 *
+	 * @param in
+	 *            raw input stream
+	 * @param detectBinary
+	 *            whether binaries should be detected
+	 * @since 2.0
+	 */
+	public AutoCRLFInputStream(InputStream in, boolean detectBinary) {
+		this.in = in;
+		this.detectBinary = detectBinary;
+	}
+
+	@Override
+	public int read() throws IOException {
+		final int read = read(single, 0, 1);
+		return read == 1 ? single[0] & 0xff : -1;
+	}
+
+	@Override
+	public int read(byte[] bs, int off, int len) throws IOException {
+		if (len == 0)
+			return 0;
+
+		if (cnt == -1)
+			return -1;
+
+		final int startOff = off;
+		final int end = off + len;
+
+		while (off < end) {
+			if (ptr == cnt && !fillBuffer())
+				break;
+
+			byte b = buf[ptr++];
+			if (isBinary || b != '\n') {
+				// Logic for binary files ends here
+				bs[off++] = last = b;
+				continue;
+			}
+
+			if (b == '\n') {
+				if (last == '\r') {
+					bs[off++] = last = b;
+					continue;
+				}
+				bs[off++] = last = '\r';
+				ptr--;
+			} else
+				bs[off++] = last = b;
+		}
+		int n = startOff == off ? -1 : off - startOff;
+		if (n > 0)
+			last = bs[off - 1];
+		return n;
+	}
+
+	@Override
+	public void close() throws IOException {
+		in.close();
+	}
+
+	private boolean fillBuffer() throws IOException {
+		cnt = in.read(buf, 0, buf.length);
+		if (cnt < 1)
+			return false;
+		if (detectBinary) {
+			isBinary = RawText.isBinary(buf, cnt);
+			detectBinary = false;
+		}
+		ptr = 0;
+		return true;
+	}
+}