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Viewing changes to contrib/NGit/NGit.Util.IO/TeeInputStream.cs

  • Committer: Bazaar Package Importer
  • Author(s): Jo Shields
  • Date: 2011-06-27 17:03:13 UTC
  • mto: (1.8.1 upstream)
  • mto: This revision was merged to the branch mainline in revision 54.
  • Revision ID: james.westby@ubuntu.com-20110627170313-6cvz3s19x6e9hqe9
Import upstream version 2.5.92+dfsg

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contrib/NGit/NGit.Util.IO/TeeInputStream.cs
 
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/*
 
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This code is derived from jgit (http://eclipse.org/jgit).
 
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Copyright owners are documented in jgit's IP log.
 
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This program and the accompanying materials are made available
 
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under the terms of the Eclipse Distribution License v1.0 which
 
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accompanies this distribution, is reproduced below, and is
 
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available at http://www.eclipse.org/org/documents/edl-v10.php
 
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All rights reserved.
 
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Redistribution and use in source and binary forms, with or
 
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without modification, are permitted provided that the following
 
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conditions are met:
 
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- Redistributions of source code must retain the above copyright
 
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  notice, this list of conditions and the following disclaimer.
 
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- Redistributions in binary form must reproduce the above
 
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  copyright notice, this list of conditions and the following
 
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  disclaimer in the documentation and/or other materials provided
 
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  with the distribution.
 
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- Neither the name of the Eclipse Foundation, Inc. nor the
 
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  names of its contributors may be used to endorse or promote
 
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  products derived from this software without specific prior
 
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  written permission.
 
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
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*/
 
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using System;
 
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using Sharpen;
 
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namespace NGit.Util.IO
 
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{
 
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        /// <summary>Input stream that copies data read to another output stream.</summary>
 
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        /// <remarks>
 
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        /// Input stream that copies data read to another output stream.
 
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        /// This stream is primarily useful with a
 
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        /// <see cref="NGit.Util.TemporaryBuffer">NGit.Util.TemporaryBuffer</see>
 
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        /// , where any
 
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        /// data read or skipped by the caller is also duplicated into the temporary
 
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        /// buffer. Later the temporary buffer can then be used instead of the original
 
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        /// source stream.
 
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        /// During close this stream copies any remaining data from the source stream
 
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        /// into the destination stream.
 
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        /// </remarks>
 
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        public class TeeInputStream : InputStream
 
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        {
 
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                private byte[] skipBuffer;
 
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                private InputStream src;
 
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                private OutputStream dst;
 
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                /// <summary>Initialize a tee input stream.</summary>
 
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                /// <remarks>Initialize a tee input stream.</remarks>
 
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                /// <param name="src">source stream to consume.</param>
 
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                /// <param name="dst">
 
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                /// destination to copy the source to as it is consumed. Typically
 
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                /// this is a
 
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                /// <see cref="NGit.Util.TemporaryBuffer">NGit.Util.TemporaryBuffer</see>
 
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                /// .
 
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                /// </param>
 
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                public TeeInputStream(InputStream src, OutputStream dst)
 
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                {
 
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                        this.src = src;
 
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                        this.dst = dst;
 
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                }
 
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                /// <exception cref="System.IO.IOException"></exception>
 
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                public override int Read()
 
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                {
 
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                        byte[] b = SkipBuffer();
 
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                        int n = Read(b, 0, 1);
 
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                        return n == 1 ? b[0] & unchecked((int)(0xff)) : -1;
 
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                }
 
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                /// <exception cref="System.IO.IOException"></exception>
 
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                public override long Skip(long cnt)
 
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                {
 
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                        long skipped = 0;
 
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                        byte[] b = SkipBuffer();
 
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                        while (0 < cnt)
 
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                        {
 
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                                int n = src.Read(b, 0, (int)Math.Min(b.Length, cnt));
 
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                                if (n <= 0)
 
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                                {
 
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                                        break;
 
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                                }
 
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                                dst.Write(b, 0, n);
 
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                                skipped += n;
 
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                                cnt -= n;
 
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                        }
 
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                        return skipped;
 
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                }
 
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                /// <exception cref="System.IO.IOException"></exception>
 
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                public override int Read(byte[] b, int off, int len)
 
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                {
 
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                        if (len == 0)
 
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                        {
 
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                                return 0;
 
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                        }
 
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                        int n = src.Read(b, off, len);
 
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                        if (0 < n)
 
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                        {
 
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                                dst.Write(b, off, n);
 
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                        }
 
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                        return n;
 
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                }
 
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                /// <exception cref="System.IO.IOException"></exception>
 
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                public override void Close()
 
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                {
 
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                        byte[] b = SkipBuffer();
 
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                        for (; ; )
 
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                        {
 
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                                int n = src.Read(b);
 
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                                if (n <= 0)
 
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                                {
 
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                                        break;
 
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                                }
 
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                                dst.Write(b, 0, n);
 
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                        }
 
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                        dst.Close();
 
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                        src.Close();
 
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                }
 
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                private byte[] SkipBuffer()
 
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                {
 
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                        if (skipBuffer == null)
 
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                        {
 
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                                skipBuffer = new byte[2048];
 
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                        }
 
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                        return skipBuffer;
 
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                }
 
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        }
 
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}