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Viewing changes to contrib/NGit/NGit.Util.IO/EolCanonicalizingInputStream.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/EolCanonicalizingInputStream.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 Sharpen;
 
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namespace NGit.Util.IO
 
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{
 
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        /// <summary>An input stream which canonicalizes EOLs bytes on the fly to '\n'.</summary>
 
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        /// <remarks>
 
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        /// An input stream which canonicalizes EOLs bytes on the fly to '\n'.
 
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        /// Note: Make sure to apply this InputStream only to text files!
 
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        /// </remarks>
 
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        public class EolCanonicalizingInputStream : InputStream
 
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        {
 
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                private readonly byte[] single = new byte[1];
 
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                private readonly byte[] buf = new byte[8096];
 
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                private readonly InputStream @in;
 
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                private int cnt;
 
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                private int ptr;
 
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                /// <summary>Creates a new InputStream, wrapping the specified stream</summary>
 
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                /// <param name="in">raw input stream</param>
 
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                public EolCanonicalizingInputStream(InputStream @in)
 
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                {
 
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                        this.@in = @in;
 
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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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                        int read = Read(single, 0, 1);
 
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                        return read == 1 ? single[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 int Read(byte[] bs, 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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                        if (cnt == -1)
 
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                        {
 
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                                return -1;
 
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                        }
 
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                        int startOff = off;
 
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                        int end = off + len;
 
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                        while (off < end)
 
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                        {
 
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                                if (ptr == cnt && !FillBuffer())
 
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                                {
 
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                                        break;
 
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                                }
 
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                                byte b = buf[ptr++];
 
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                                if (b != '\r')
 
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                                {
 
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                                        bs[off++] = b;
 
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                                        continue;
 
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                                }
 
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                                if (ptr == cnt && !FillBuffer())
 
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                                {
 
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                                        bs[off++] = (byte)('\r');
 
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                                        break;
 
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                                }
 
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                                if (buf[ptr] == '\n')
 
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                                {
 
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                                        bs[off++] = (byte)('\n');
 
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                                        ptr++;
 
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                                }
 
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                                else
 
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                                {
 
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                                        bs[off++] = (byte)('\r');
 
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                                }
 
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                        }
 
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                        return startOff == off ? -1 : off - startOff;
 
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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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                        @in.Close();
 
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                }
 
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                /// <exception cref="System.IO.IOException"></exception>
 
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                private bool FillBuffer()
 
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                {
 
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                        cnt = @in.Read(buf, 0, buf.Length);
 
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                        if (cnt < 1)
 
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                        {
 
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                                return false;
 
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                        }
 
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                        ptr = 0;
 
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                        return true;
 
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                }
 
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        }
 
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}