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/*
* Copyright (C) 2015, Ivan Motsch <ivan.motsch@bsiag.com>
* Copyright (C) 2020, Thomas Wolf <thomas.wolf@paranor.ch> 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.IOException;
import java.io.OutputStream;
import org.eclipse.jgit.diff.RawText;
/**
* An OutputStream that reduces CRLF to LF.
* <p>
* Existing single CR are not changed to LF, but retained as is.
* </p>
* <p>
* 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). If the binary check determines that the input is not
* binary but text with CR/LF, canonicalization is also turned off.
* </p>
*
* @since 4.3
*/
public class AutoLFOutputStream 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;
/**
* Constructor for AutoLFOutputStream.
*
* @param out
* an {@link java.io.OutputStream} object.
*/
public AutoLFOutputStream(OutputStream out) {
this(out, true);
}
/**
* Constructor for AutoLFOutputStream.
*
* @param out
* an {@link java.io.OutputStream} object.
* @param detectBinary
* whether binaries should be detected
*/
public AutoLFOutputStream(OutputStream out, boolean detectBinary) {
this.out = out;
this.detectBinary = detectBinary;
}
@Override
public void write(int b) throws IOException {
onebytebuf[0] = (byte) b;
write(onebytebuf, 0, 1);
}
@Override
public void write(byte[] b) throws IOException {
int overflow = buffer(b, 0, b.length);
if (overflow > 0) {
write(b, b.length - overflow, overflow);
}
}
@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;
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':
// skip write r but backlog r
if (lastw < i) {
out.write(b, lastw, i - lastw);
}
lastw = i + 1;
buf = '\r';
break;
case '\n':
if (buf == '\r') {
out.write('\n');
lastw = i + 1;
buf = -1;
} else {
if (lastw < i + 1) {
out.write(b, lastw, i + 1 - lastw);
}
lastw = i + 1;
}
break;
default:
if (buf == '\r') {
out.write('\r');
lastw = i;
}
buf = -1;
break;
}
}
if (lastw < off + len) {
out.write(b, lastw, off + len - lastw);
}
}
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);
}
@Override
public void flush() throws IOException {
if (binbufcnt <= binbuf.length) {
decideMode(true);
}
out.flush();
}
@Override
public void close() throws IOException {
flush();
if (buf == '\r') {
out.write(buf);
buf = -1;
}
out.close();
}
}
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