71 lines
2.5 KiB
C#
71 lines
2.5 KiB
C#
//
|
|
// 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 System.Collections.Generic;
|
|
using System.Text;
|
|
using DiscUtils.Streams;
|
|
|
|
namespace DiscUtils.Iso9660
|
|
{
|
|
internal class DirectoryExtent : BuilderExtent
|
|
{
|
|
private readonly BuildDirectoryInfo _dirInfo;
|
|
private readonly Encoding _enc;
|
|
private readonly Dictionary<BuildDirectoryMember, uint> _locationTable;
|
|
|
|
private byte[] _readCache;
|
|
|
|
public DirectoryExtent(BuildDirectoryInfo dirInfo, Dictionary<BuildDirectoryMember, uint> locationTable,
|
|
Encoding enc, long start)
|
|
: base(start, dirInfo.GetDataSize(enc))
|
|
{
|
|
_dirInfo = dirInfo;
|
|
_locationTable = locationTable;
|
|
_enc = enc;
|
|
}
|
|
|
|
public override void Dispose() {}
|
|
|
|
public override void PrepareForRead()
|
|
{
|
|
_readCache = new byte[Length];
|
|
_dirInfo.Write(_readCache, 0, _locationTable, _enc);
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
} |