/// <summary>
/// Gets a single value from the current buffer at the specified position.
/// </summary>
/// <typeparam name="T">The type of the value to be read from the buffer.</typeparam>
/// <param name="positionInBytes">Relative position in bytes from the beginning of the buffer to get the data from.</param>
/// <param name="value">The value as out.</param>
/// <returns>The value that was read.</returns>
public void Get <T>(int positionInBytes, out T value) where T : struct
{
unsafe
{
SdxUtilities.ReadOut((IntPtr)(_buffer + positionInBytes), out value);
}
}
/// <summary>
/// Gets a sequence of elements from a position in the buffer into a target buffer.
/// </summary>
/// <param name="positionInBytes">Relative position in bytes from the beginning of the buffer to get the data from.</param>
/// <param name = "buffer">An array of values to be read from the buffer.</param>
/// <param name = "offset">The zero-based byte offset in buffer at which to begin storing
/// the data read from the current buffer.</param>
/// <param name = "count">The number of values to be read from the current buffer.</param>
public void GetRange <T>(int positionInBytes, T[] buffer, int offset, int count) where T : struct
{
unsafe
{
SdxUtilities.Read((IntPtr)(_buffer + positionInBytes), buffer, offset, count);
}
}
/// <summary>
/// Sets a range of data to a specified position into the buffer.
/// </summary>
/// <param name="positionInBytes">Relative position in bytes from the beginning of the buffer to set the data to.</param>
/// <param name = "source">A pointer to the location to start copying from.</param>
/// <param name = "count">The number of bytes to copy from source to the current buffer.</param>
public void Set(int positionInBytes, IntPtr source, long count)
{
unsafe
{
SdxUtilities.CopyMemory((IntPtr)(_buffer + positionInBytes), source, (int)count);
}
}
/// <summary>
/// Sets an array of values to a specified position into the buffer.
/// </summary>
/// <typeparam name = "T">The type of the values to be written to the buffer.</typeparam>
/// <param name="positionInBytes">Relative position in bytes from the beginning of the buffer to set the data to.</param>
/// <param name = "data">An array of values to be written to the buffer.</param>
/// <param name = "offset">The zero-based offset in data at which to begin copying values to the current buffer.</param>
/// <param name = "count">The number of values to be written to the current buffer. If this is zero,
/// all of the contents <paramref name = "data" /> will be written.</param>
public void Set <T>(int positionInBytes, T[] data, int offset, int count) where T : struct
{
unsafe
{
SdxUtilities.Write((IntPtr)(_buffer + positionInBytes), data, offset, count);
}
}
/// <summary>
/// Creates the specified user buffer.
/// </summary>
/// <typeparam name="T">Type of the buffer.</typeparam>
/// <param name="userBuffer">The buffer to use as a DataBuffer.</param>
/// <param name="index">Index inside the buffer in terms of element count (not size in bytes).</param>
/// <param name="pinBuffer">True to keep the managed buffer and pin it, false will allocate unmanaged memory and make a copy of it. Default is true.</param>
/// <returns>An instance of a DataBuffer</returns>
public static DataBuffer Create <T>(T[] userBuffer, int index = 0, bool pinBuffer = true) where T : struct
{
unsafe
{
if (userBuffer == null)
{
throw new ArgumentNullException("userBuffer");
}
if (index < 0 || index > userBuffer.Length)
{
throw new ArgumentException("Index is out of range [0, userBuffer.Length-1]", "index");
}
DataBuffer buffer;
var sizeOfBuffer = SdxUtilities.SizeOf(userBuffer);
var indexOffset = index * SdxUtilities.SizeOf <T>();
if (pinBuffer)
{
var handle = GCHandle.Alloc(userBuffer, GCHandleType.Pinned);
buffer = new DataBuffer(indexOffset + (byte *)handle.AddrOfPinnedObject(), sizeOfBuffer - indexOffset, handle);
}
else
{
// The .NET Native compiler crashes if '(IntPtr)' is removed.
buffer = new DataBuffer(indexOffset + (byte *)(IntPtr)Interop.Fixed(userBuffer), sizeOfBuffer - indexOffset, true);
}
return(buffer);
}
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources
/// </summary>
/// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected override void Dispose(bool disposing)
{
if (disposing)
{
#if !WINDOWS_UWP
if (_blob != null)
{
_blob.Dispose();
_blob = null;
}
#endif
}
if (_gCHandle.IsAllocated)
{
_gCHandle.Free();
}
unsafe
{
if (_ownsBuffer && _buffer != (sbyte *)0)
{
SdxUtilities.FreeMemory((IntPtr)_buffer);
_buffer = (sbyte *)0;
}
}
}
/// <summary>
/// When overridden in a derived class, writes a sequence of bytes to the current stream and advances the current position within this stream by the number of bytes written.
/// </summary>
/// <param name="buffer">An array of bytes. This method copies <paramref name="count" /> bytes from <paramref name="buffer" /> to the current stream.</param>
/// <param name="offset">The zero-based byte offset in <paramref name="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)
{
unsafe
{
SdxUtilities.CopyMemory((IntPtr)(_buffer + _position), new IntPtr((byte *)buffer + offset), count);
_position += count;
}
}
/// <summary>
/// Gets a single value from the current buffer at the specified position.
/// </summary>
/// <param name="positionInBytes">Relative position in bytes from the beginning of the buffer to get the data from.</param>
/// <typeparam name = "T">The type of the value to be read from the buffer.</typeparam>
/// <returns>The value that was read.</returns>
public T Get <T>(int positionInBytes) where T : struct
{
unsafe
{
T result = default(T);
SdxUtilities.Read((IntPtr)(_buffer + positionInBytes), ref result);
return(result);
}
}
/// <summary>
/// Gets an array of values from a position in the buffer.
/// </summary>
/// <param name="positionInBytes">Relative position in bytes from the beginning of the buffer to get the data from.</param>
/// <param name="count">number of T instance to get from the positionInBytes</param>
/// <typeparam name = "T">The type of the values to be read from the buffer.</typeparam>
/// <returns>An array of values that was read from the current buffer.</returns>
public T[] GetRange <T>(int positionInBytes, int count) where T : struct
{
unsafe
{
var result = new T[count];
SdxUtilities.Read((IntPtr)(_buffer + positionInBytes), result, 0, count);
return(result);
}
}
/// <summary>
/// Converts this instance to a read only typed buffer.
/// </summary>
/// <typeparam name="T">Type of a buffer element</typeparam>
/// <returns>A readonly typed buffer.</returns>
/// <exception cref="System.InvalidOperationException">DataPointer is Zero</exception>
public T[] ToArray <T>() where T : struct
{
if (Pointer == IntPtr.Zero)
{
throw new InvalidOperationException("DataPointer is Zero");
}
var buffer = new T[Size / SdxUtilities.SizeOf <T>()];
CopyTo(buffer, 0, buffer.Length);
return(buffer);
}
/// <summary>
/// Writes a single value to the stream, and advances the current position
/// within this stream by the number of bytes written.
/// </summary>
/// <remarks>
/// In order to provide faster read/write, this operation doesn't check stream bound.
/// A client must carefully not read/write above the size of this datastream.
/// </remarks>
/// <typeparam name = "T">The type of the value to be written to the stream.</typeparam>
/// <param name = "value">The value to write to the stream.</param>
/// <exception cref = "T:System.NotSupportedException">The stream does not support writing.</exception>
public void Write <T>(T value) where T : struct
{
if (!_canWrite)
{
throw new NotSupportedException();
}
unsafe
{
_position = (byte *)SdxUtilities.WriteAndPosition((IntPtr)(_buffer + _position), ref value) - _buffer;
}
}
/// <summary>
/// Initializes a new instance of the <see cref = "DataBuffer" /> class, and allocates a new buffer to use as a backing store.
/// </summary>
/// <param name = "sizeInBytes">The size of the buffer to be allocated, in bytes.</param>
/// <exception cref = "T:System.ArgumentOutOfRangeException">
/// <paramref name = "sizeInBytes" /> is less than 1.</exception>
public DataBuffer(int sizeInBytes)
{
unsafe
{
Debug.Assert(sizeInBytes > 0);
_buffer = (sbyte *)SdxUtilities.AllocateMemory(sizeInBytes);
_size = sizeInBytes;
_ownsBuffer = true;
}
}
/// <summary>
/// Writes an array of values to the current stream, and advances the current position
/// within this stream by the number of bytes written.
/// </summary>
/// <remarks>
/// In order to provide faster read/write, this operation doesn't check stream bound.
/// A client must carefully not read/write above the size of this datastream.
/// </remarks>
/// <typeparam name = "T">The type of the values to be written to the stream.</typeparam>
/// <param name = "data">An array of values to be written to the stream.</param>
/// <param name = "offset">The zero-based offset in data at which to begin copying values to the current stream.</param>
/// <param name = "count">The number of values to be written to the current stream. If this is zero,
/// all of the contents <paramref name = "data" /> will be written.</param>
/// <exception cref = "T:System.NotSupportedException">This stream does not support writing.</exception>
public void WriteRange <T>(T[] data, int offset, int count) where T : struct
{
unsafe
{
if (!_canWrite)
{
throw new NotSupportedException();
}
_position = (byte *)SdxUtilities.Write((IntPtr)(_buffer + _position), data, offset, count) - _buffer;
}
}
/// <summary>
/// Initializes a new instance of the <see cref = "DataStream" /> class, and allocates a new buffer to use as a backing store.
/// </summary>
/// <param name = "sizeInBytes">The size of the buffer to be allocated, in bytes.</param>
/// <param name = "canRead">
/// <c>true</c> if reading from the buffer should be allowed; otherwise, <c>false</c>.</param>
/// <param name = "canWrite">
/// <c>true</c> if writing to the buffer should be allowed; otherwise, <c>false</c>.</param>
public DataStream(int sizeInBytes, bool canRead, bool canWrite)
{
unsafe
{
Debug.Assert(sizeInBytes > 0);
_buffer = (byte *)SdxUtilities.AllocateMemory(sizeInBytes);
_size = sizeInBytes;
_ownsBuffer = true;
_canRead = canRead;
_canWrite = canWrite;
}
}
/// <summary>
/// Reads a sequence of elements from the current stream into a target buffer and
/// advances the position within the stream by the number of bytes read.
/// </summary>
/// <remarks>
/// In order to provide faster read/write, this operation doesn't check stream bound.
/// A client must carefully not read/write above the size of this datastream.
/// </remarks>
/// <param name = "buffer">An array of values to be read from the stream.</param>
/// <param name = "offset">The zero-based byte offset in buffer at which to begin storing
/// the data read from the current stream.</param>
/// <param name = "count">The number of values to be read from the current stream.</param>
/// <returns>The number of bytes read from the stream.</returns>
/// <exception cref = "T:System.NotSupportedException">This stream does not support reading.</exception>
public int ReadRange <T>(T[] buffer, int offset, int count) where T : struct
{
unsafe
{
if (!_canRead)
{
throw new NotSupportedException();
}
var oldPosition = _position;
_position = (byte *)SdxUtilities.Read((IntPtr)(_buffer + _position), buffer, offset, count) - _buffer;
return((int)(_position - oldPosition));
}
}
/// <summary>
/// Converts this instance to a read only byte buffer.
/// </summary>
/// <returns>A readonly byte buffer.</returns>
/// <exception cref="System.InvalidOperationException">
/// DataPointer is Zero
/// or
/// Size cannot be < 0
/// </exception>
public byte[] ToArray()
{
if (Pointer == IntPtr.Zero)
{
throw new InvalidOperationException("DataPointer is Zero");
}
if (Size < 0)
{
throw new InvalidOperationException("Size cannot be < 0");
}
var buffer = new byte[Size];
SdxUtilities.Read(Pointer, buffer, 0, Size);
return(buffer);
}
/// <summary>
/// Reads a single value from the current stream and advances the current
/// position within this stream by the number of bytes read.
/// </summary>
/// <remarks>
/// In order to provide faster read/write, this operation doesn't check stream bound.
/// A client must carefully not read/write above the size of this datastream.
/// </remarks>
/// <typeparam name = "T">The type of the value to be read from the stream.</typeparam>
/// <returns>The value that was read.</returns>
/// <exception cref = "T:System.NotSupportedException">This stream does not support reading.</exception>
public T Read <T>() where T : struct
{
unsafe
{
if (!_canRead)
{
throw new NotSupportedException();
}
byte *from = _buffer + _position;
T result = default(T);
_position = (byte *)SdxUtilities.ReadAndPosition((IntPtr)from, ref result) - _buffer;
return(result);
}
}
/// <summary>
/// Reads an array of values from the current stream, and advances the current position
/// within this stream by the number of bytes written.
/// </summary>
/// <remarks>
/// In order to provide faster read/write, this operation doesn't check stream bound.
/// A client must carefully not read/write above the size of this datastream.
/// </remarks>
/// <typeparam name = "T">The type of the values to be read from the stream.</typeparam>
/// <returns>An array of values that was read from the current stream.</returns>
public T[] ReadRange <T>(int count) where T : struct
{
unsafe
{
if (!_canRead)
{
throw new NotSupportedException();
}
byte *from = _buffer + _position;
var result = new T[count];
_position = (byte *)SdxUtilities.Read((IntPtr)from, result, 0, count) - _buffer;
return(result);
}
}
internal unsafe DataBuffer(void *buffer, int sizeInBytes, bool makeCopy)
{
Debug.Assert(sizeInBytes > 0);
if (makeCopy)
{
_buffer = (sbyte *)SdxUtilities.AllocateMemory(sizeInBytes);
SdxUtilities.CopyMemory((IntPtr)_buffer, (IntPtr)buffer, sizeInBytes);
}
else
{
_buffer = (sbyte *)buffer;
}
_size = sizeInBytes;
_ownsBuffer = makeCopy;
}
internal unsafe DataStream(void *buffer, int sizeInBytes, bool canRead, bool canWrite, bool makeCopy)
{
Debug.Assert(sizeInBytes > 0);
if (makeCopy)
{
_buffer = (byte *)SdxUtilities.AllocateMemory(sizeInBytes);
SdxUtilities.CopyMemory((IntPtr)_buffer, (IntPtr)buffer, sizeInBytes);
}
else
{
_buffer = (byte *)buffer;
}
_size = sizeInBytes;
_canRead = canRead;
_canWrite = canWrite;
_ownsBuffer = makeCopy;
}
/// <summary>
/// Writes a range of bytes to the current stream, and advances the current position
/// within this stream by the number of bytes written.
/// </summary>
/// <remarks>
/// In order to provide faster read/write, this operation doesn't check stream bound.
/// A client must carefully not read/write above the size of this datastream.
/// </remarks>
/// <param name = "source">A pointer to the location to start copying from.</param>
/// <param name = "count">The number of bytes to copy from source to the current stream.</param>
/// <exception cref = "T:System.NotSupportedException">This stream does not support writing.</exception>
public void WriteRange(IntPtr source, long count)
{
unsafe
{
if (!_canWrite)
{
throw new NotSupportedException();
}
Debug.Assert(_canWrite);
Debug.Assert(source != IntPtr.Zero);
Debug.Assert(count > 0);
Debug.Assert((_position + count) <= _size);
// TODO: use Interop.memcpy
SdxUtilities.CopyMemory((IntPtr)(_buffer + _position), source, (int)count);
_position += count;
}
}
/// <summary>
/// Writes the content of the specified buffer to the unmanaged memory location of this instance.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="buffer">The buffer to read from.</param>
/// <param name="offset">The offset in the array to read from.</param>
/// <param name="count">The number of T element to write to the memory location.</param>
/// <exception cref="System.ArgumentNullException">buffer</exception>
/// <exception cref="System.InvalidOperationException">DataPointer is Zero</exception>
/// <exception cref="System.ArgumentOutOfRangeException">buffer;Total buffer size cannot be larger than size of this data pointer</exception>
public void CopyFrom <T>(T[] buffer, int offset, int count) where T : struct
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (Pointer == IntPtr.Zero)
{
throw new InvalidOperationException("DataPointer is Zero");
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException("offset", "Must be >= 0");
}
if (count <= 0)
{
throw new ArgumentOutOfRangeException("count", "Must be > 0");
}
if (count * SdxUtilities.SizeOf <T>() > Size)
{
throw new ArgumentOutOfRangeException("buffer", "Total buffer size cannot be larger than size of this data pointer");
}
SdxUtilities.Write(Pointer, buffer, offset, count);
}
/// <summary>
/// Clears the buffer.
/// </summary>
public unsafe void Clear(byte value = 0)
{
SdxUtilities.ClearMemory((IntPtr)_buffer, value, Size);
}
