C# Class Cimbalino.Phone.Toolkit.Compression.CrcCalculatorStream

A Stream that calculates a CRC32 (a checksum) on all bytes read, or on all bytes written.

This class can be used to verify the CRC of a ZipEntry when reading from a stream, or to calculate a CRC when writing to a stream. The stream should be used to either read, or write, but not both. If you intermix reads and writes, the results are not defined.

This class is intended primarily for use internally by the DotNetZip library.

Inheritance: System.IO.Stream, System.IDisposable

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Public Methods

Method	Description
Close ( ) : void	Closes the stream.
CrcCalculatorStream ( System stream ) : System	The default constructor. Instances returned from this constructor will leave the underlying stream open upon Close(). The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320.
CrcCalculatorStream ( System stream, System.Int64 length ) : System	A constructor allowing the specification of the length of the stream to read. The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320. Instances returned from this constructor will leave the underlying stream open upon Close().
CrcCalculatorStream ( System stream, System.Int64 length, bool leaveOpen ) : System	A constructor allowing the specification of the length of the stream to read, as well as whether to keep the underlying stream open upon Close(). The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320.
CrcCalculatorStream ( System stream, System.Int64 length, bool leaveOpen, CRC32 crc32 ) : System	A constructor allowing the specification of the length of the stream to read, as well as whether to keep the underlying stream open upon Close(), and the CRC32 instance to use. The stream uses the specified CRC32 instance, which allows the application to specify how the CRC gets calculated.
CrcCalculatorStream ( System stream, bool leaveOpen ) : System	The constructor allows the caller to specify how to handle the underlying stream at close. The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320.
Flush ( ) : void	Flush the stream.
Read ( byte buffer, int offset, int count ) : int	Read from the stream
Seek ( long offset, System origin ) : long	Seeking is not supported on this stream. This method always throws NotSupportedException
SetLength ( long value ) : void	This method always throws NotSupportedException
Write ( byte buffer, int offset, int count ) : void	Write to the stream.

Private Methods

Method	Description
CrcCalculatorStream ( bool leaveOpen, System.Int64 length, System stream, CRC32 crc32 ) : System
IDisposable ( ) : void

Method Details

Close() public method

Closes the stream.

public Close ( ) : void
return	void

CrcCalculatorStream() public method

The default constructor.

Instances returned from this constructor will leave the underlying stream open upon Close(). The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320.

public CrcCalculatorStream ( System stream ) : System
stream	System	The underlying stream
return	System

CrcCalculatorStream() public method

A constructor allowing the specification of the length of the stream to read.

The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320.

Instances returned from this constructor will leave the underlying stream open upon Close().

public CrcCalculatorStream ( System stream, System.Int64 length ) : System
stream	System	The underlying stream
length	System.Int64	The length of the stream to slurp
return	System

CrcCalculatorStream() public method

A constructor allowing the specification of the length of the stream to read, as well as whether to keep the underlying stream open upon Close().

The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320.

public CrcCalculatorStream ( System stream, System.Int64 length, bool leaveOpen ) : System
stream	System	The underlying stream
length	System.Int64	The length of the stream to slurp
leaveOpen	bool	true to leave the underlying stream /// open upon close of the CrcCalculatorStream; false otherwise.
return	System

CrcCalculatorStream() public method

A constructor allowing the specification of the length of the stream to read, as well as whether to keep the underlying stream open upon Close(), and the CRC32 instance to use.

The stream uses the specified CRC32 instance, which allows the application to specify how the CRC gets calculated.

public CrcCalculatorStream ( System stream, System.Int64 length, bool leaveOpen, CRC32 crc32 ) : System
stream	System	The underlying stream
length	System.Int64	The length of the stream to slurp
leaveOpen	bool	true to leave the underlying stream /// open upon close of the CrcCalculatorStream; false otherwise.
crc32	CRC32	the CRC32 instance to use to calculate the CRC32
return	System

CrcCalculatorStream() public method

The constructor allows the caller to specify how to handle the underlying stream at close.

The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320.

public CrcCalculatorStream ( System stream, bool leaveOpen ) : System
stream	System	The underlying stream
leaveOpen	bool	true to leave the underlying stream /// open upon close of the CrcCalculatorStream; false otherwise.
return	System

Flush() public method

Flush the stream.

public Flush ( ) : void
return	void

Read() public method

Read from the stream

public Read ( byte buffer, int offset, int count ) : int
buffer	byte	the buffer to read
offset	int	the offset at which to start
count	int	the number of bytes to read
return	int

Seek() public method

Seeking is not supported on this stream. This method always throws NotSupportedException

public Seek ( long offset, System origin ) : long
offset	long	N/A
origin	System	N/A
return	long

SetLength() public method

This method always throws NotSupportedException

public SetLength ( long value ) : void
value	long	N/A
return	void

Write() public method

Write to the stream.

public Write ( byte buffer, int offset, int count ) : void
buffer	byte	the buffer from which to write
offset	int	the offset at which to start writing
count	int	the number of bytes to write
return	void