60 lines
2.0 KiB
C#
60 lines
2.0 KiB
C#
//
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// Copyright (c) 2008-2011, Kenneth Bell
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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using System;
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using DiscUtils.Streams;
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namespace DiscUtils.Iso9660
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{
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internal abstract class VolumeDescriptorDiskRegion : BuilderExtent
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{
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private byte[] _readCache;
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public VolumeDescriptorDiskRegion(long start)
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: base(start, IsoUtilities.SectorSize) {}
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public override void Dispose() {}
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public override void PrepareForRead()
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{
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_readCache = GetBlockData();
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}
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public override int Read(long diskOffset, byte[] buffer, int offset, int count)
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{
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long relPos = diskOffset - Start;
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int numRead = (int)Math.Min(count, _readCache.Length - relPos);
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Array.Copy(_readCache, (int)relPos, buffer, offset, numRead);
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return numRead;
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}
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public override void DisposeReadState()
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{
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_readCache = null;
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}
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protected abstract byte[] GetBlockData();
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}
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} |