| /* |
| * 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(); |
| } |
| } |