public void Bug5203_IncreaseSize()
{
MemoryStream ms = new MemoryStream();
BlockCacheSettings settings = new BlockCacheSettings {
BlockSize = 64, LargeReadSize = 128, OptimumReadSize = 64, ReadCacheSize = 1024
};
BlockCacheStream bcs = new BlockCacheStream(SparseStream.FromStream(ms, Ownership.Dispose), Ownership.Dispose, settings);
// Pre-load read cache with a 'short' block
bcs.Write(new byte[11], 0, 11);
bcs.Position = 0;
bcs.Read(new byte[11], 0, 11);
// Extend stream
for (int i = 0; i < 20; ++i)
{
bcs.Write(new byte[11], 0, 11);
}
// Try to read from first block beyond length of original cached short length
// Bug was throwing exception here
bcs.Position = 60;
bcs.Read(new byte[20], 0, 20);
}
/// <summary>
/// Opens the specified file.
/// </summary>
/// <param name="path">The full path of the file to open.</param>
/// <param name="mode">The file mode for the created stream.</param>
/// <param name="access">The access permissions for the created stream.</param>
/// <returns>The new stream.</returns>
public override SparseStream OpenFile(string path, FileMode mode, FileAccess access)
{
if (_readOnly && access != FileAccess.Read)
{
throw new UnauthorizedAccessException();
}
if (path.StartsWith(@"\", StringComparison.OrdinalIgnoreCase))
{
path = path.Substring(1);
}
FileShare fileShare = FileShare.None;
if (access == FileAccess.Read)
{
fileShare = FileShare.Read;
}
var locator = new LocalFileLocator(BasePath);
return(SparseStream.FromStream(locator.Open(path, mode, access, fileShare),
Ownership.Dispose));
}
private void RunSparse()
{
SparseStream inStream = InputStream as SparseStream;
if (inStream == null)
{
inStream = SparseStream.FromStream(InputStream, Ownership.None);
}
if (BufferSize > SparseChunkSize && BufferSize % SparseChunkSize != 0)
{
throw new InvalidOperationException("Buffer size is not a multiple of the sparse chunk size");
}
byte[] copyBuffer = new byte[Math.Max(BufferSize, SparseChunkSize)];
BytesRead = 0;
BytesWritten = 0;
foreach (StreamExtent extent in inStream.Extents)
{
inStream.Position = extent.Start;
long extentOffset = 0;
while (extentOffset < extent.Length)
{
int toRead = (int)Math.Min(copyBuffer.Length, extent.Length - extentOffset);
int numRead = Utilities.ReadFully(inStream, copyBuffer, 0, toRead);
BytesRead += numRead;
int copyBufferOffset = 0;
for (int i = 0; i < numRead; i += SparseChunkSize)
{
if (IsAllZeros(copyBuffer, i, Math.Min(SparseChunkSize, numRead - i)))
{
if (copyBufferOffset < i)
{
OutputStream.Position = extent.Start + extentOffset + copyBufferOffset;
OutputStream.Write(copyBuffer, copyBufferOffset, i - copyBufferOffset);
BytesWritten += i - copyBufferOffset;
}
copyBufferOffset = i + SparseChunkSize;
}
}
if (copyBufferOffset < numRead)
{
OutputStream.Position = extent.Start + extentOffset + copyBufferOffset;
OutputStream.Write(copyBuffer, copyBufferOffset, numRead - copyBufferOffset);
BytesWritten += numRead - copyBufferOffset;
}
extentOffset += numRead;
RaiseProgressEvent();
}
}
// Ensure the output stream is at least as long as the input stream. This uses
// read/write, rather than SetLength, to avoid failing on streams that can't be
// explicitly resized. Side-effect of this, is that if outStream is an NTFS
// file stream, then actual clusters will be allocated out to at least the
// length of the input stream.
if (OutputStream.Length < inStream.Length)
{
inStream.Position = inStream.Length - 1;
int b = inStream.ReadByte();
if (b >= 0)
{
OutputStream.Position = inStream.Length - 1;
OutputStream.WriteByte((byte)b);
}
}
}
public void OpenView()
{
ThreadSafeStream tss = new ThreadSafeStream(SparseStream.FromStream(Stream.Null, Ownership.None));
SparseStream view = tss.OpenView();
}
