86 lines
2.7 KiB
C#
86 lines
2.7 KiB
C#
//
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// FileSource.cs - the abstract base class for defining how a deferred File retrieves its 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.Collections.Generic;
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using MBS.Framework;
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namespace UniversalEditor.ObjectModels.FileSystem
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{
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/// <summary>
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/// The abstract base class for defining how a deferred <see cref="File" /> retrieves its data.
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/// </summary>
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public abstract class FileSource : ISupportsExtraData
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{
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private FileSourceTransformation.FileSourceTransformationCollection mvarTransformations = new FileSourceTransformation.FileSourceTransformationCollection();
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public FileSourceTransformation.FileSourceTransformationCollection Transformations { get { return mvarTransformations; } }
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public byte[] GetData() { return GetData(0, GetLength()); }
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public byte[] GetData(long offset, long length)
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{
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byte[] data = GetDataInternal(offset, length);
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System.IO.MemoryStream msInput = new System.IO.MemoryStream(data);
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for (int i = 0; i < Transformations.Count; i++)
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{
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System.IO.MemoryStream msOutput = new System.IO.MemoryStream();
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Transformations[i].Function(this, msInput, msOutput);
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msInput = msOutput;
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}
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return msInput.ToArray();
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}
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public abstract byte[] GetDataInternal(long offset, long length);
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public abstract long GetLength();
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// ISupportsExtraData
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private Dictionary<string, object> extraDataDictionary = new Dictionary<string, object>();
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public T GetExtraData<T>(string key, T defaultValue = default(T))
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{
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if (extraDataDictionary.ContainsKey(key) && extraDataDictionary[key] is T)
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{
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return (T)extraDataDictionary[key];
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}
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return defaultValue;
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}
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public void SetExtraData<T>(string key, T value)
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{
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extraDataDictionary[key] = value;
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}
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public object GetExtraData(string key, object defaultValue = null)
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{
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if (extraDataDictionary.ContainsKey(key))
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{
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return extraDataDictionary[key];
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}
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return defaultValue;
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}
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public void SetExtraData(string key, object value)
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{
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extraDataDictionary[key] = value;
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}
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}
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}
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