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Viewing changes to contrib/NGit/NGit.Patch/BinaryHunk.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.Patch/BinaryHunk.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 NGit;
 
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using NGit.Patch;
 
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using NGit.Util;
 
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using Sharpen;
 
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namespace NGit.Patch
 
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{
 
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        /// <summary>Part of a "GIT binary patch" to describe the pre-image or post-image</summary>
 
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        public class BinaryHunk
 
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        {
 
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                private static readonly byte[] LITERAL = Constants.EncodeASCII("literal ");
 
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                private static readonly byte[] DELTA = Constants.EncodeASCII("delta ");
 
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                /// <summary>Type of information stored in a binary hunk.</summary>
 
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                /// <remarks>Type of information stored in a binary hunk.</remarks>
 
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                public enum Type
 
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                {
 
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                        LITERAL_DEFLATED,
 
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                        DELTA_DEFLATED
 
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                }
 
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                private readonly FileHeader file;
 
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                /// <summary>
 
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                /// Offset within
 
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                /// <see cref="file">file</see>
 
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                /// .buf to the "literal" or "delta " line.
 
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                /// </summary>
 
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                internal readonly int startOffset;
 
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                /// <summary>
 
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                /// Position 1 past the end of this hunk within
 
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                /// <see cref="file">file</see>
 
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                /// 's buf.
 
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                /// </summary>
 
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                internal int endOffset;
 
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                /// <summary>Type of the data meaning.</summary>
 
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                /// <remarks>Type of the data meaning.</remarks>
 
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                private BinaryHunk.Type type;
 
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                /// <summary>Inflated length of the data.</summary>
 
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                /// <remarks>Inflated length of the data.</remarks>
 
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                private int length;
 
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                internal BinaryHunk(FileHeader fh, int offset)
 
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                {
 
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                        file = fh;
 
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                        startOffset = offset;
 
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                }
 
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                /// <returns>header for the file this hunk applies to</returns>
 
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                public virtual FileHeader GetFileHeader()
 
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                {
 
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                        return file;
 
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                }
 
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                /// <returns>the byte array holding this hunk's patch script.</returns>
 
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                public virtual byte[] GetBuffer()
 
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                {
 
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                        return file.buf;
 
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                }
 
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                /// <returns>
 
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                /// offset the start of this hunk in
 
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                /// <see cref="GetBuffer()">GetBuffer()</see>
 
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                /// .
 
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                /// </returns>
 
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                public virtual int GetStartOffset()
 
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                {
 
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                        return startOffset;
 
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                }
 
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                /// <returns>
 
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                /// offset one past the end of the hunk in
 
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                /// <see cref="GetBuffer()">GetBuffer()</see>
 
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                /// .
 
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                /// </returns>
 
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                public virtual int GetEndOffset()
 
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                {
 
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                        return endOffset;
 
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                }
 
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                /// <returns>type of this binary hunk</returns>
 
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                public virtual BinaryHunk.Type GetType()
 
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                {
 
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                        return type;
 
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                }
 
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                /// <returns>inflated size of this hunk's data</returns>
 
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                public virtual int GetSize()
 
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                {
 
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                        return length;
 
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                }
 
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                internal virtual int ParseHunk(int ptr, int end)
 
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                {
 
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                        byte[] buf = file.buf;
 
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                        if (RawParseUtils.Match(buf, ptr, LITERAL) >= 0)
 
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                        {
 
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                                type = BinaryHunk.Type.LITERAL_DEFLATED;
 
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                                length = RawParseUtils.ParseBase10(buf, ptr + LITERAL.Length, null);
 
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                        }
 
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                        else
 
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                        {
 
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                                if (RawParseUtils.Match(buf, ptr, DELTA) >= 0)
 
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                                {
 
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                                        type = BinaryHunk.Type.DELTA_DEFLATED;
 
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                                        length = RawParseUtils.ParseBase10(buf, ptr + DELTA.Length, null);
 
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                                }
 
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                                else
 
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                                {
 
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                                        // Not a valid binary hunk. Signal to the caller that
 
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                                        // we cannot parse any further and that this line should
 
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                                        // be treated otherwise.
 
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                                        //
 
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                                        return -1;
 
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                                }
 
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                        }
 
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                        ptr = RawParseUtils.NextLF(buf, ptr);
 
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                        // Skip until the first blank line; that is the end of the binary
 
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                        // encoded information in this hunk. To save time we don't do a
 
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                        // validation of the binary data at this point.
 
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                        //
 
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                        while (ptr < end)
 
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                        {
 
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                                bool empty = buf[ptr] == '\n';
 
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                                ptr = RawParseUtils.NextLF(buf, ptr);
 
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                                if (empty)
 
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                                {
 
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                                        break;
 
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                                }
 
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                        }
 
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                        return ptr;
 
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                }
 
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        }
 
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}