public override void Flush()
{
if (!NativeFile.FlushFileBuffers(this.handle))
{
throw new IOException("Unable to flush stream", NativeFileStream.MarshalGetLastWin32Error());
}
}
public override long Seek(long offset, SeekOrigin origin)
{
long distanceToMoveHigh;
if (!NativeFile.SetFilePointerEx(this.handle, offset, out distanceToMoveHigh, origin))
{
throw new IOException("Unable to seek to this position", NativeFileStream.MarshalGetLastWin32Error());
}
this.position = distanceToMoveHigh;
return(this.position);
}
public unsafe int Read(IntPtr buffer, int offset, int count)
{
if (buffer == IntPtr.Zero)
{
throw new ArgumentNullException("buffer");
}
int numberOfBytesRead;
if (!NativeFile.ReadFile(this.handle, (IntPtr)((void *)((IntPtr)(void *)buffer + offset)), count, out numberOfBytesRead, IntPtr.Zero))
{
throw new IOException("Unable to read from file", NativeFileStream.MarshalGetLastWin32Error());
}
this.position += (long)numberOfBytesRead;
return(numberOfBytesRead);
}
public override void SetLength(long value)
{
long distanceToMoveHigh;
if (!NativeFile.SetFilePointerEx(this.handle, value, out distanceToMoveHigh, SeekOrigin.Begin))
{
throw new IOException("Unable to seek to this position", NativeFileStream.MarshalGetLastWin32Error());
}
if (!NativeFile.SetEndOfFile(this.handle))
{
throw new IOException("Unable to set the new length", NativeFileStream.MarshalGetLastWin32Error());
}
if (this.position < value)
{
this.Seek(this.position, SeekOrigin.Begin);
}
else
{
this.Seek(0L, SeekOrigin.End);
}
}
public NativeFileStream(string fileName, NativeFileMode fileMode, NativeFileAccess access, NativeFileShare share = NativeFileShare.Read)
{
this.handle = NativeFile.Create(fileName, access, share, IntPtr.Zero, fileMode, NativeFileOptions.None, IntPtr.Zero);
if (this.handle == new IntPtr(-1))
{
int lastWin32Error = NativeFileStream.MarshalGetLastWin32Error();
if (lastWin32Error == 2)
{
throw new FileNotFoundException("Unable to find file", fileName);
}
Result resultFromWin32Error = Result.GetResultFromWin32Error(lastWin32Error);
throw new IOException(string.Format((IFormatProvider)CultureInfo.InvariantCulture, "Unable to open file {0}", new object[1]
{
(object)fileName
}), resultFromWin32Error.Code);
}
else
{
this.canRead = (NativeFileAccess)0 != (access & NativeFileAccess.Read);
this.canWrite = (NativeFileAccess)0 != (access & NativeFileAccess.Write);
this.canSeek = true;
}
}
