/// <inheritdoc/>
public override void Flush()
{
if (!NativeFile.FlushFileBuffers(handle))
{
throw new IOException("Unable to flush stream", MarshalGetLastWin32Error());
}
}
/// <summary>
/// Initializes a new instance of the <see cref="NativeFileStream"/> class.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// <param name="fileMode">The file mode.</param>
/// <param name="access">The access mode.</param>
/// <param name="share">The share mode.</param>
public unsafe NativeFileStream(string fileName, NativeFileMode fileMode, NativeFileAccess access, NativeFileShare share = NativeFileShare.Read)
{
#if STORE_APP
//uint newAccess = 0;
//const int FILE_ATTRIBUTE_NORMAL = 0x00000080;
//const int FILE_FLAG_RANDOM_ACCESS = 0x10000000;
//const int FILE_FLAG_SEQUENTIAL_SCAN = 0x08000000;
//var extendedParams = default(NativeFile.CREATEFILE2_EXTENDED_PARAMETERS);
//extendedParams.dwSize = (uint)Utilities.SizeOf<NativeFile.CREATEFILE2_EXTENDED_PARAMETERS>();
//extendedParams.dwFileAttributes = FILE_ATTRIBUTE_NORMAL;
//extendedParams.dwFileFlags = FILE_FLAG_RANDOM_ACCESS;
//extendedParams.dwSecurityQosFlags = 0;
//extendedParams.lpSecurityAttributes = IntPtr.Zero;
//extendedParams.hTemplateFile = IntPtr.Zero;
//if ((access & NativeFileAccess.Read) != 0)
//{
// // Sets GENERIC_READ
// newAccess |= 0x00120089;
//}
//if ((access & NativeFileAccess.Write) != 0)
//{
// newAccess |= 0x00120116;
//}
//if ((access & NativeFileAccess.Execute) != 0)
//{
// newAccess |= 0x001200a0;
//}
//handle = NativeFile.Create(fileName, (NativeFileAccess)newAccess, share, fileMode, new IntPtr(&extendedParams));
handle = NativeFile.Create(fileName, access, share, fileMode, IntPtr.Zero);
#else
handle = NativeFile.Create(fileName, access, share, IntPtr.Zero, fileMode, NativeFileOptions.None, IntPtr.Zero);
#endif
if (handle == new IntPtr(-1))
{
var lastWin32Error = MarshalGetLastWin32Error();
if (lastWin32Error == 2)
{
throw new FileNotFoundException("Unable to find file", fileName);
}
var lastError = Result.GetResultFromWin32Error(lastWin32Error);
throw new IOException(string.Format(CultureInfo.InvariantCulture, "Unable to open file {0}", fileName), lastError.Code);
}
canRead = 0 != (access & NativeFileAccess.Read);
canWrite = 0 != (access & NativeFileAccess.Write);
// TODO how setup correctly canSeek flags?
// Kernel32.GetFileType(SafeFileHandle handle); is not available on W8CORE
canSeek = true;
}
/// <inheritdoc/>
public override long Seek(long offset, SeekOrigin origin)
{
long newPosition;
if (!NativeFile.SetFilePointerEx(handle, offset, out newPosition, origin))
{
throw new IOException("Unable to seek to this position", MarshalGetLastWin32Error());
}
position = newPosition;
return(position);
}
/// <summary>
/// Writes a block of bytes to this stream using data from a buffer.
/// </summary>
/// <param name="buffer">The buffer containing data to write to the stream.</param>
/// <param name="offset">The zero-based byte offset in buffer at which to begin copying bytes to the current stream. </param>
/// <param name="count">The number of bytes to be written to the current stream. </param>
public void Write(IntPtr buffer, int offset, int count)
{
if (buffer == IntPtr.Zero)
{
throw new ArgumentNullException("buffer");
}
int numberOfBytesWritten;
unsafe
{
void *pbuffer = (byte *)buffer + offset;
{
if (!NativeFile.WriteFile(handle, (IntPtr)pbuffer, count, out numberOfBytesWritten, IntPtr.Zero))
{
throw new IOException("Unable to write to file", MarshalGetLastWin32Error());
}
}
position += numberOfBytesWritten;
}
}
/// <summary>
/// Reads a block of bytes from the stream and writes the data in a given buffer.
/// </summary>
/// <param name="buffer">When this method returns, contains the specified buffer with the values between offset and (offset + count - 1) replaced by the bytes read from the current source. </param>
/// <param name="offset">The byte offset in array at which the read bytes will be placed. </param>
/// <param name="count">The maximum number of bytes to read. </param>
/// <exception cref="ArgumentNullException">array is null. </exception>
/// <returns>The total number of bytes read into the buffer. This might be less than the number of bytes requested if that number of bytes are not currently available, or zero if the end of the stream is reached.</returns>
public int Read(IntPtr buffer, int offset, int count)
{
if (buffer == IntPtr.Zero)
{
throw new ArgumentNullException("buffer");
}
int numberOfBytesRead;
unsafe
{
void *pbuffer = (byte *)buffer + offset;
{
if (!NativeFile.ReadFile(handle, (IntPtr)pbuffer, count, out numberOfBytesRead, IntPtr.Zero))
{
throw new IOException("Unable to read from file", MarshalGetLastWin32Error());
}
}
position += numberOfBytesRead;
}
return(numberOfBytesRead);
}
/// <inheritdoc/>
public override void SetLength(long value)
{
long newPosition;
if (!NativeFile.SetFilePointerEx(handle, value, out newPosition, SeekOrigin.Begin))
{
throw new IOException("Unable to seek to this position", MarshalGetLastWin32Error());
}
if (!NativeFile.SetEndOfFile(handle))
{
throw new IOException("Unable to set the new length", MarshalGetLastWin32Error());
}
if (position < value)
{
Seek(position, SeekOrigin.Begin);
}
else
{
Seek(0, SeekOrigin.End);
}
}
