AutoCRLFOutputStream.java
- /*
- * Copyright (C) 2011, 2013 Robin Rosenberg
- * 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.OutputStream;
- import org.eclipse.jgit.diff.RawText;
- /**
- * An OutputStream that expands LF to CRLF.
- *
- * Existing CRLF are not expanded to CRCRLF, but retained as is.
- *
- * 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 AutoCRLFOutputStream extends OutputStream {
- static final int BUFFER_SIZE = 8000;
- private final OutputStream out;
- private int buf = -1;
- private byte[] binbuf = new byte[BUFFER_SIZE];
- private byte[] onebytebuf = new byte[1];
- private int binbufcnt = 0;
- private boolean detectBinary;
- private boolean isBinary;
- /**
- * <p>Constructor for AutoCRLFOutputStream.</p>
- *
- * @param out a {@link java.io.OutputStream} object.
- */
- public AutoCRLFOutputStream(OutputStream out) {
- this(out, true);
- }
- /**
- * <p>Constructor for AutoCRLFOutputStream.</p>
- *
- * @param out a {@link java.io.OutputStream} object.
- * @param detectBinary
- * whether binaries should be detected
- * @since 4.3
- */
- public AutoCRLFOutputStream(OutputStream out, boolean detectBinary) {
- this.out = out;
- this.detectBinary = detectBinary;
- }
- /** {@inheritDoc} */
- @Override
- public void write(int b) throws IOException {
- onebytebuf[0] = (byte) b;
- write(onebytebuf, 0, 1);
- }
- /** {@inheritDoc} */
- @Override
- public void write(byte[] b) throws IOException {
- int overflow = buffer(b, 0, b.length);
- if (overflow > 0)
- write(b, b.length - overflow, overflow);
- }
- /** {@inheritDoc} */
- @Override
- public void write(byte[] b, int startOff, int startLen)
- throws IOException {
- final int overflow = buffer(b, startOff, startLen);
- if (overflow < 0)
- return;
- final int off = startOff + startLen - overflow;
- final int len = overflow;
- if (len == 0)
- return;
- int lastw = off;
- if (isBinary) {
- out.write(b, off, len);
- return;
- }
- for (int i = off; i < off + len; ++i) {
- final byte c = b[i];
- if (c == '\r') {
- buf = '\r';
- } else if (c == '\n') {
- if (buf != '\r') {
- if (lastw < i) {
- out.write(b, lastw, i - lastw);
- }
- out.write('\r');
- lastw = i;
- }
- buf = -1;
- } else {
- buf = -1;
- }
- }
- if (lastw < off + len) {
- out.write(b, lastw, off + len - lastw);
- }
- if (b[off + len - 1] == '\r')
- buf = '\r';
- }
- private int buffer(byte[] b, int off, int len) throws IOException {
- if (binbufcnt > binbuf.length)
- return len;
- int copy = Math.min(binbuf.length - binbufcnt, len);
- System.arraycopy(b, off, binbuf, binbufcnt, copy);
- binbufcnt += copy;
- int remaining = len - copy;
- if (remaining > 0)
- decideMode();
- return remaining;
- }
- private void decideMode() throws IOException {
- if (detectBinary) {
- isBinary = RawText.isBinary(binbuf, binbufcnt);
- detectBinary = false;
- }
- int cachedLen = binbufcnt;
- binbufcnt = binbuf.length + 1; // full!
- write(binbuf, 0, cachedLen);
- }
- /** {@inheritDoc} */
- @Override
- public void flush() throws IOException {
- if (binbufcnt <= binbuf.length)
- decideMode();
- buf = -1;
- out.flush();
- }
- /** {@inheritDoc} */
- @Override
- public void close() throws IOException {
- flush();
- out.close();
- }
- }