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/*
* Copyright (C) 2010, 2013 Marc Strapetz <marc.strapetz@syntevo.com>
* Copyright (C) 2015, Ivan Motsch <ivan.motsch@bsiag.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 InputStream that normalizes CRLF to LF.
*
* Existing single CR are not changed to LF, 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).
* <p>
* This is the former EolCanonicalizingInputStream with a new name in order to
* have same naming for all LF / CRLF streams
*
* @since 4.3
*/
public class AutoLFInputStream 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 boolean abortIfBinary;
/**
* A special exception thrown when {@link AutoLFInputStream} is told to
* throw an exception when attempting to read a binary file. The exception
* may be thrown at any stage during reading.
*
* @since 3.3
*/
public static class IsBinaryException extends IOException {
private static final long serialVersionUID = 1L;
IsBinaryException() {
super();
}
}
/**
* Creates a new InputStream, wrapping the specified stream
*
* @param in
* raw input stream
* @param detectBinary
* whether binaries should be detected
* @since 2.0
*/
public AutoLFInputStream(InputStream in, boolean detectBinary) {
this(in, detectBinary, false);
}
/**
* Creates a new InputStream, wrapping the specified stream
*
* @param in
* raw input stream
* @param detectBinary
* whether binaries should be detected
* @param abortIfBinary
* throw an IOException if the file is binary
* @since 3.3
*/
public AutoLFInputStream(InputStream in, boolean detectBinary,
boolean abortIfBinary) {
this.in = in;
this.detectBinary = detectBinary;
this.abortIfBinary = abortIfBinary;
}
/** {@inheritDoc} */
@Override
public int read() throws IOException {
final int read = read(single, 0, 1);
return read == 1 ? single[0] & 0xff : -1;
}
/** {@inheritDoc} */
@Override
public int read(byte[] bs, final int off, final int len)
throws IOException {
if (len == 0)
return 0;
if (cnt == -1)
return -1;
int i = off;
final int end = off + len;
while (i < end) {
if (ptr == cnt && !fillBuffer()) {
break;
}
byte b = buf[ptr++];
if (isBinary || b != '\r') {
// Logic for binary files ends here
bs[i++] = b;
continue;
}
if (ptr == cnt && !fillBuffer()) {
bs[i++] = '\r';
break;
}
if (buf[ptr] == '\n') {
bs[i++] = '\n';
ptr++;
} else
bs[i++] = '\r';
}
return i == off ? -1 : i - off;
}
/**
* Whether the stream has detected as a binary so far.
*
* @return true if the stream has detected as a binary so far.
* @since 3.3
*/
public boolean isBinary() {
return isBinary;
}
/** {@inheritDoc} */
@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;
if (isBinary && abortIfBinary)
throw new IsBinaryException();
}
ptr = 0;
return true;
}
}
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