85 lines
2.8 KiB
C#
85 lines
2.8 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.IO;
|
|
using System.Text;
|
|
using DiscUtils.Streams;
|
|
|
|
namespace DiscUtils.Iso9660
|
|
{
|
|
internal class FileExtent : BuilderExtent
|
|
{
|
|
private readonly BuildFileInfo _fileInfo;
|
|
|
|
private Stream _readStream;
|
|
|
|
public FileExtent(BuildFileInfo fileInfo, long start)
|
|
: base(start, fileInfo.GetDataSize(Encoding.ASCII))
|
|
{
|
|
_fileInfo = fileInfo;
|
|
}
|
|
|
|
public override void Dispose()
|
|
{
|
|
if (_readStream != null)
|
|
{
|
|
_fileInfo.CloseStream(_readStream);
|
|
_readStream = null;
|
|
}
|
|
}
|
|
|
|
public override void PrepareForRead()
|
|
{
|
|
_readStream = _fileInfo.OpenStream();
|
|
}
|
|
|
|
public override int Read(long diskOffset, byte[] block, int offset, int count)
|
|
{
|
|
long relPos = diskOffset - Start;
|
|
int totalRead = 0;
|
|
|
|
// Don't arbitrarily set position, just in case stream implementation is
|
|
// non-seeking, and we're doing sequential reads
|
|
if (_readStream.Position != relPos)
|
|
{
|
|
_readStream.Position = relPos;
|
|
}
|
|
|
|
// Read up to EOF
|
|
int numRead = _readStream.Read(block, offset, count);
|
|
totalRead += numRead;
|
|
while (numRead > 0 && totalRead < count)
|
|
{
|
|
numRead = _readStream.Read(block, offset + totalRead, count - totalRead);
|
|
totalRead += numRead;
|
|
}
|
|
|
|
return totalRead;
|
|
}
|
|
|
|
public override void DisposeReadState()
|
|
{
|
|
_fileInfo.CloseStream(_readStream);
|
|
_readStream = null;
|
|
}
|
|
}
|
|
} |