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/*
* Copyright (C) 2011, 2013 Robin Rosenberg and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.util.io;
import java.io.BufferedOutputStream;
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 {@link RawText#getBufferSize()} bytes is
* performed and in case of binary files, canonicalization is turned off (for
* the complete file).
*/
public class AutoCRLFOutputStream extends OutputStream {
private final OutputStream out;
private int buf = -1;
private byte[] binbuf = new byte[RawText.getBufferSize()];
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) {
// avoid to write single lines directly to FileOutputStream:
this.out = out instanceof BufferedOutputStream ? out
: new BufferedOutputStream(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];
switch (c) {
case '\r':
buf = '\r';
break;
case '\n':
if (buf != '\r') {
if (lastw < i) {
out.write(b, lastw, i - lastw);
}
out.write('\r');
lastw = i;
}
buf = -1;
break;
default:
buf = -1;
break;
}
}
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(false);
}
return remaining;
}
private void decideMode(boolean complete) throws IOException {
if (detectBinary) {
isBinary = RawText.isBinary(binbuf, binbufcnt, complete);
if (!isBinary) {
isBinary = RawText.isCrLfText(binbuf, binbufcnt, complete);
}
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(true);
}
buf = -1;
out.flush();
}
/** {@inheritDoc} */
@Override
public void close() throws IOException {
flush();
out.close();
}
}
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