private FileStream WindowsCreateFile(string fileName, bool allowConcurrentWrite)
{
var fileShare = Win32FileNativeMethods.FILE_SHARE_READ;
if (allowConcurrentWrite)
{
fileShare |= Win32FileNativeMethods.FILE_SHARE_WRITE;
}
if (CreateFileParameters.EnableFileDelete && PlatformDetector.CurrentOS != RuntimeOS.Windows)
{
fileShare |= Win32FileNativeMethods.FILE_SHARE_DELETE;
}
var handle = Win32FileNativeMethods.CreateFile(
fileName,
Win32FileNativeMethods.FileAccess.GenericWrite,
fileShare,
IntPtr.Zero,
Win32FileNativeMethods.CreationDisposition.OpenAlways,
CreateFileParameters.FileAttributes,
IntPtr.Zero);
if (handle.ToInt32() == -1)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
var safeHandle = new SafeFileHandle(handle, true);
var returnValue = new FileStream(safeHandle, FileAccess.Write, CreateFileParameters.BufferSize);
returnValue.Seek(0, SeekOrigin.End);
return(returnValue);
}
private FileStream WindowsCreateFile(string fileName, bool allowFileSharedWriting)
{
int fileShare = Win32FileNativeMethods.FILE_SHARE_READ;
if (allowFileSharedWriting)
{
fileShare |= Win32FileNativeMethods.FILE_SHARE_WRITE;
}
if (this.CreateFileParameters.EnableFileDelete && PlatformDetector.CurrentOS != RuntimeOS.Windows)
{
fileShare |= Win32FileNativeMethods.FILE_SHARE_DELETE;
}
Microsoft.Win32.SafeHandles.SafeFileHandle handle = null;
FileStream fileStream = null;
try
{
handle = Win32FileNativeMethods.CreateFile(
fileName,
Win32FileNativeMethods.FileAccess.GenericWrite,
fileShare,
IntPtr.Zero,
Win32FileNativeMethods.CreationDisposition.OpenAlways,
this.CreateFileParameters.FileAttributes,
IntPtr.Zero);
if (handle.IsInvalid)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
fileStream = new FileStream(handle, FileAccess.Write, this.CreateFileParameters.BufferSize);
fileStream.Seek(0, SeekOrigin.End);
return(fileStream);
}
catch
{
if (fileStream != null)
{
fileStream.Dispose();
}
if ((handle != null) && (!handle.IsClosed))
{
handle.Close();
}
throw;
}
}
private FileStream WindowsCreateFile(string fileName, bool allowFileSharedWriting)
{
int fileShare = Win32FileNativeMethods.FILE_SHARE_READ;
if (allowFileSharedWriting)
{
fileShare |= Win32FileNativeMethods.FILE_SHARE_WRITE;
}
if (this.CreateFileParameters.EnableFileDelete && PlatformDetector.CurrentOS != RuntimeOS.Windows)
{
fileShare |= Win32FileNativeMethods.FILE_SHARE_DELETE;
}
Microsoft.Win32.SafeHandles.SafeFileHandle handle = null;
FileStream fileStream = null;
try
{
handle = Win32FileNativeMethods.CreateFile(
fileName,
Win32FileNativeMethods.FileAccess.GenericWrite | Win32FileNativeMethods.FileAccess.GenericRead,
fileShare,
IntPtr.Zero,
Win32FileNativeMethods.CreationDisposition.OpenAlways,
this.CreateFileParameters.FileAttributes,
IntPtr.Zero);
if (handle.IsInvalid)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
#if !SILVERLIGHT && !MONO && !__IOS__ && !__ANDROID__ && NET4_5
// TODO: Beware there be dragons here, every time we create a file stream, it creates a byte array the size of the buffersize.
// TODO: in MS .NET implementation, the file stream does write to its internal buffer if you are writing something that is bigger than its buffer size,
// So, to prevent allocations, we set the buffer to 1, since then it will just write whats in the incoming buffer and not allocate a buffer
if (this.CreateFileParameters.PoolingEnabled)
{
fileStream = new FileStream(handle, FileAccess.ReadWrite, 1);
}
else
{
fileStream = new FileStream(handle, FileAccess.ReadWrite, this.CreateFileParameters.BufferSize);
}
#else
fileStream = new FileStream(handle, FileAccess.Write, this.CreateFileParameters.BufferSize);
#endif
fileStream.Seek(0, SeekOrigin.End);
return(fileStream);
}
catch
{
if (fileStream != null)
{
fileStream.Dispose();
}
if ((handle != null) && (!handle.IsClosed))
{
handle.Close();
}
throw;
}
}
