- /*
- * Copyright (C) 2010, 2013 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 input stream which canonicalizes EOLs bytes on the fly to '\n'.
- *
- * 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 EolCanonicalizingInputStream 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 EolCanonicalizingInputStream} is
- * told to throw an exception when attempting to read a binary file. The
- * exception may be thrown at any stage during reading.
- *
- * @since 3.2
- */
- 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 EolCanonicalizingInputStream(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 3.2
- */
- public EolCanonicalizingInputStream(InputStream in, boolean detectBinary,
- boolean abortIfBinary) {
- this.in = in;
- this.detectBinary = detectBinary;
- this.abortIfBinary = abortIfBinary;
- }
-
- @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, 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;
- }
-
- /**
- * @return true if the stream has detected as a binary so far
- * @since 3.2
- */
- public boolean isBinary() {
- return isBinary;
- }
-
- @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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