| /* |
| * 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, int off, 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 = 0; |
| while (cnt < buf.length) { |
| int n = in.read(buf, cnt, buf.length - cnt); |
| if (n < 0) { |
| break; |
| } |
| cnt += n; |
| } |
| if (cnt < 1) { |
| cnt = -1; |
| return false; |
| } |
| if (detectBinary) { |
| isBinary = RawText.isBinary(buf, cnt); |
| detectBinary = false; |
| if (isBinary && abortIfBinary) |
| throw new IsBinaryException(); |
| } |
| ptr = 0; |
| return true; |
| } |
| } |