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- /*
- * Copyright (C) 2010, 2013 Google Inc.
- * 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 java.io.OutputStream;
-
- import org.eclipse.jgit.util.TemporaryBuffer;
-
- /**
- * Input stream that copies data read to another output stream.
- *
- * This stream is primarily useful with a {@link TemporaryBuffer}, where any
- * data read or skipped by the caller is also duplicated into the temporary
- * buffer. Later the temporary buffer can then be used instead of the original
- * source stream.
- *
- * During close this stream copies any remaining data from the source stream
- * into the destination stream.
- */
- public class TeeInputStream extends InputStream {
- private byte[] skipBuffer;
-
- private InputStream src;
-
- private OutputStream dst;
-
- /**
- * Initialize a tee input stream.
- *
- * @param src
- * source stream to consume.
- * @param dst
- * destination to copy the source to as it is consumed. Typically
- * this is a {@link TemporaryBuffer}.
- */
- public TeeInputStream(InputStream src, OutputStream dst) {
- this.src = src;
- this.dst = dst;
- }
-
- @Override
- public int read() throws IOException {
- byte[] b = skipBuffer();
- int n = read(b, 0, 1);
- return n == 1 ? b[0] & 0xff : -1;
- }
-
- @Override
- public long skip(final long count) throws IOException {
- long skipped = 0;
- long cnt = count;
- final byte[] b = skipBuffer();
- while (0 < cnt) {
- final int n = src.read(b, 0, (int) Math.min(b.length, cnt));
- if (n <= 0)
- break;
- dst.write(b, 0, n);
- skipped += n;
- cnt -= n;
- }
- return skipped;
- }
-
- @Override
- public int read(byte[] b, int off, int len) throws IOException {
- if (len == 0)
- return 0;
-
- int n = src.read(b, off, len);
- if (0 < n)
- dst.write(b, off, n);
- return n;
- }
-
- public void close() throws IOException {
- byte[] b = skipBuffer();
- for (;;) {
- int n = src.read(b);
- if (n <= 0)
- break;
- dst.write(b, 0, n);
- }
- dst.close();
- src.close();
- }
-
- private byte[] skipBuffer() {
- if (skipBuffer == null)
- skipBuffer = new byte[2048];
- return skipBuffer;
- }
- }
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