diff options
Diffstat (limited to 'org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoLFOutputStream.java')
| -rw-r--r-- | org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoLFOutputStream.java | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoLFOutputStream.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoLFOutputStream.java new file mode 100644 index 0000000000..c932b00f3c --- /dev/null +++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/io/AutoLFOutputStream.java @@ -0,0 +1,200 @@ +/* + * Copyright (C) 2015, Ivan Motsch <ivan.motsch@bsiag.com> + * + * 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.OutputStream; + +import org.eclipse.jgit.diff.RawText; + +/** + * An OutputStream that reduces CRLF to LF. + * + * Existing single CR are not changed to LF, but retained as is. + * + * A binary check on the first 8000 bytes is performed and in case of binary + * files, canonicalization is turned off (for the complete file). + * + * @since 4.3 + */ +public class AutoLFOutputStream extends OutputStream { + + static final int BUFFER_SIZE = 8000; + + private final OutputStream out; + + private int buf = -1; + + private byte[] binbuf = new byte[BUFFER_SIZE]; + + private byte[] onebytebuf = new byte[1]; + + private int binbufcnt = 0; + + private boolean detectBinary; + + private boolean isBinary; + + /** + * @param out + */ + public AutoLFOutputStream(OutputStream out) { + this(out, true); + } + + /** + * @param out + * @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, final int startOff, final 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; + if (len == 0) { + return; + } + int lastw = off; + if (isBinary) { + out.write(b, off, len); + return; + } + for (int i = off; i < off + len; ++i) { + final byte c = b[i]; + if (c == '\r') { + // skip write r but backlog r + if (lastw < i) { + out.write(b, lastw, i - lastw); + } + lastw = i + 1; + buf = '\r'; + } else if (c == '\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; + } + } else { + if (buf == '\r') { + out.write('\r'); + lastw = i; + } + buf = -1; + } + } + 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(); + } + return remaining; + } + + private void decideMode() throws IOException { + if (detectBinary) { + isBinary = RawText.isBinary(binbuf, binbufcnt); + 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(); + } + out.flush(); + } + + @Override + public void close() throws IOException { + flush(); + if (buf == '\r') { + out.write(buf); + buf = -1; + } + out.close(); + } +} |