WPinternals/DiscUtils/BuilderExtent.cs

//
// 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.
//

namespace DiscUtils
{
    using System;
    using System.Collections.Generic;

    internal abstract class BuilderExtent : IDisposable
    {
        private long _start;
        private long _length;

        public BuilderExtent(long start, long length)
        {
            _start = start;
            _length = length;
        }

        /// <summary>
        /// Gets the parts of the stream that are stored.
        /// </summary>
        /// <remarks>This may be an empty enumeration if all bytes are zero.</remarks>
        public virtual IEnumerable<StreamExtent> StreamExtents
        {
            get
            {
                return new StreamExtent[] { new StreamExtent(Start, Length) };
            }
        }

        internal long Start
        {
            get { return _start; }
        }

        internal long Length
        {
            get { return _length; }
        }

        public abstract void Dispose();

        internal abstract void PrepareForRead();

        internal abstract int Read(long diskOffset, byte[] block, int offset, int count);

        internal abstract void DisposeReadState();
    }
}