C# Class Redzen.IO.MemoryBlockStream

A memory backed stream that stores byte data in blocks, this gives improved performance over System.IO.MemoryStream in some circumstances. MemoryStream is backed by a single byte array, hence if the capacity is reached a new byte array must be instantiated and the existing data copied across. In contrast, MemoryBlockStream grows in blocks and therefore avoids copying and re-instantiating large byte arrays. Also note that by using a sufficiently small block size the blocks will avoid being placed onto the large object heap, with various benefits, e.g. avoidance/mitigation of memory fragmentation.

Inheritance: Stream

ファイルを表示 Open project: colgreen/Redzen Class Usage Examples

Private Properties

Property	Type	Description
EnsureCapacity	void
ReadInner	int
WriteInner	void
ZeroSpareCapacity	void

Public Methods

Method	Description
Flush ( ) : void	Overrides Stream.Flush so that no action is performed.
MemoryBlockStream ( ) : System	Construct with the default block size.
MemoryBlockStream ( int blockSize ) : System	Construct with the specified block size.
Read ( byte buffer, int offset, int count ) : int	Reads a block of bytes from the stream and writes the data to a buffer.
ReadByte ( ) : int	Reads a byte from the stream.
Seek ( long offset, SeekOrigin origin ) : long	Sets the position within the stream to the specified value.
SetLength ( long value ) : void	Sets the length of the stream to the specified value.
ToArray ( ) : byte[]	Writes the stream contents to a byte array, regardless of the Position property.
Trim ( ) : void	Remove excess blocks from the block list.
Write ( byte buffer, int offset, int count ) : void	Writes a block of bytes into the stream.
WriteByte ( byte value ) : void	Writes a byte to the stream at the current position.

Private Methods

Method	Description
EnsureCapacity ( int value ) : void
ReadInner ( byte buff, int offset, int count, int blockIdx, int blockOffset ) : int	Read bytes from the memory stream into the provided buffer, starting at the specified block index and intra-block offset..
WriteInner ( byte buff, int offset, int count, int blockIdx, int blockOffset ) : void	Write bytes into the memory stream, starting at the specified block index and intra-block offset.
ZeroSpareCapacity ( ) : void	Ensure that any existing capacity after _length is zeroed.

Method Details

Flush() public method

Overrides Stream.Flush so that no action is performed.

public Flush ( ) : void
return	void

MemoryBlockStream() public method

Construct with the default block size.

public MemoryBlockStream ( ) : System
return	System

MemoryBlockStream() public method

Construct with the specified block size.

public MemoryBlockStream ( int blockSize ) : System
blockSize	int	The block size to use.
return	System

Read() public method

Reads a block of bytes from the stream and writes the data to a buffer.

public Read ( byte buffer, int offset, int count ) : int
buffer	byte	The byte array to read bytes into.
offset	int	The zero-based byte offset in buffer at which to begin storing data from the current stream.
count	int	The maximum number of bytes to read.
return	int

ReadByte() public method

Reads a byte from the stream.

public ReadByte ( ) : int
return	int

Seek() public method

Sets the position within the stream to the specified value.

public Seek ( long offset, SeekOrigin origin ) : long
offset	long	The new position within the stream. This is relative to the loc parameter, and can be positive or negative.
origin	SeekOrigin	A value of type SeekOrigin, which acts as the seek reference point.
return	long

SetLength() public method

Sets the length of the stream to the specified value.

public SetLength ( long value ) : void
value	long
return	void

ToArray() public method

Writes the stream contents to a byte array, regardless of the Position property.

public ToArray ( ) : byte[]
return	byte[]

Trim() public method

Remove excess blocks from the block list.

public Trim ( ) : void
return	void

Write() public method

Writes a block of bytes into the stream.

public Write ( byte buffer, int offset, int count ) : void
buffer	byte	The byte data to write into the stream
offset	int	The zero-based byte offset in buffer from which to begin copying bytes to the current stream.
count	int	The maximum number of bytes to write.
return	void

WriteByte() public method

Writes a byte to the stream at the current position.

public WriteByte ( byte value ) : void
value	byte	The byte to write.
return	void