71 lines
2.3 KiB
C#
71 lines
2.3 KiB
C#
//
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// CompressedEmbeddedFileSource.cs - provides a FileSource for retrieving compressed embedded file data
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//
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// Author:
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// Michael Becker <alcexhim@gmail.com>
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//
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// Copyright (c) 2011-2020 Mike Becker's Software
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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using System;
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using System.Diagnostics.Contracts;
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using UniversalEditor.IO;
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namespace UniversalEditor.ObjectModels.FileSystem.FileSources
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{
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/// <summary>
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/// Provides a <see cref="FileSource" /> for retrieving compressed embedded file data.
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/// </summary>
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public class CompressedEmbeddedFileSource : FileSource
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{
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public Reader Reader { get; private set; }
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public long Offset { get; private set; }
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public long DecompressedLength { get; private set; }
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public long CompressedLength { get; private set; }
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public override byte[] GetDataInternal(long offset, long length)
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{
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Reader.Seek(Offset, SeekOrigin.Begin);
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byte[] sourceData = Reader.ReadBytes(DecompressedLength);
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long realLength = Math.Min(length, sourceData.Length);
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byte[] data = new byte[realLength];
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Array.Copy(sourceData, 0, data, 0, realLength);
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return data;
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}
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public override long GetLength()
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{
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return DecompressedLength;
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}
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public CompressedEmbeddedFileSource(Reader reader, long offset, long decompressedLength, long compressedLength, FileSourceTransformation[] transformations)
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{
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Reader = reader;
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Offset = offset;
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DecompressedLength = decompressedLength;
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CompressedLength = compressedLength;
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Contract.Assert(!(transformations.Length < 0 && decompressedLength != compressedLength), "Must provide a decompression transformation");
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foreach (FileSourceTransformation transformation in transformations)
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{
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base.Transformations.Add(transformation);
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}
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}
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}
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}
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