// // Copyright (c) 2008-2011, Kenneth Bell // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER // DEALINGS IN THE SOFTWARE. // using System; using DiscUtils.Streams; namespace DiscUtils.Iso9660Ps1 { internal abstract class VolumeDescriptorDiskRegion : BuilderExtent { private byte[] _readCache; public VolumeDescriptorDiskRegion(long start, int sectorSize) : base(start, sectorSize) {} public override void Dispose() {} public override void PrepareForRead() { _readCache = GetBlockData(); } public override int Read(long diskOffset, byte[] buffer, int offset, int count) { long relPos = diskOffset - Start; int numRead = (int)Math.Min(count, _readCache.Length - relPos); Array.Copy(_readCache, (int)relPos, buffer, offset, numRead); return numRead; } public override void DisposeReadState() { _readCache = null; } protected abstract byte[] GetBlockData(); } }