Ogre::DeflateStream Class Reference

Stream which compresses / uncompresses data using the 'deflate' compression algorithm. More...

#include <OgreDeflate.h>

Inheritance diagram for Ogre::DeflateStream:

Public Types
enum	AccessMode { READ = 1 , WRITE = 2 }
enum	StreamType { Invalid = -1 , Deflate = 0 , ZLib = 1 , GZip = 2 }
	Requested stream type. More...

Public Member Functions
	DeflateStream (const DataStreamPtr &compressedStream, const String &tmpFileName="", size_t avail_in=0)
	Constructor for creating unnamed stream wrapping another stream.
	DeflateStream (const String &name, const DataStreamPtr &compressedStream, const String &tmpFileName="", size_t avail_in=0)
	Constructor for creating named stream wrapping another stream.
	DeflateStream (const String &name, const DataStreamPtr &compressedStream, StreamType streamType, const String &tmpFileName="", size_t avail_in=0)
	Constructor for creating named stream wrapping another stream.
	~DeflateStream ()
void	close (void)
	Close the stream; this makes further operations invalid.
bool	eof (void) const
	Returns true if the stream has reached the end.
uint16	getAccessMode () const
	Gets the access mode of the stream.
virtual String	getAsString (void)
	Returns a String containing the entire stream.
virtual String	getLine (bool trimAfter=true)
	Returns a String containing the next line of data, optionally trimmed for whitespace.
const String &	getName (void)
	Returns the name of the stream, if it has one.
bool	isCompressedStreamValid () const
	Returns whether the compressed stream is valid deflated data.
virtual bool	isReadable () const
	Reports whether this stream is readable.
virtual bool	isWriteable () const
	Reports whether this stream is writeable.
void	operator delete (void *ptr)
void	operator delete (void *ptr, const char *, int, const char *)
void	operator delete (void *ptr, void *)
void	operator delete[] (void *ptr)
void	operator delete[] (void *ptr, const char *, int, const char *)
void *	operator new (size_t sz)
void *	operator new (size_t sz, const char *file, int line, const char *func)
	operator new, with debug line info
void *	operator new (size_t sz, void *ptr)
	placement operator new
void *	operator new[] (size_t sz)
void *	operator new[] (size_t sz, const char *file, int line, const char *func)
	array operator new, with debug line info
template<typename T >
DataStream &	operator>> (T &val)
size_t	read (void *buf, size_t count)
	Read the requisite number of bytes from the stream, stopping at the end of the file.
virtual size_t	readLine (char *buf, size_t maxCount, const String &delim="\n")
	Get a single line from the stream.
void	seek (size_t pos)
	Repositions the read point to a specified byte.
size_t	size (void) const
	Returns the total size of the data to be read from the stream, or 0 if this is indeterminate for this stream.
void	skip (long count)
	Skip a defined number of bytes.
virtual size_t	skipLine (const String &delim="\n")
	Skip a single line from the stream.
size_t	tell (void) const
	Returns the current byte offset from beginning.
size_t	write (const void *buf, size_t count)
	Write the requisite number of bytes from the stream (only applicable to streams that are not read-only)

Detailed Description

Stream which compresses / uncompresses data using the 'deflate' compression algorithm.

Remarks

This stream is designed to wrap another stream for the actual source / destination of the compressed data, it has no concrete source / data itself. The idea is that you pass uncompressed data through this stream, and the underlying stream reads/writes compressed data to the final source.

Note

This is an alternative to using a compressed archive since it is able to compress & decompress regardless of the actual source of the stream. You should avoid using this with already compressed archives. Also note that this cannot be used as a read / write stream, only a read-only or write-only stream.

Member Enumeration Documentation

AccessMode

enum Ogre::DataStream::AccessMode

inherited

Enumerator
READ
WRITE

StreamType

enum Ogre::DeflateStream::StreamType

Requested stream type.

All are essentially the same deflate stream with varying wrapping. ZLib is used by default.

Enumerator
Invalid
Deflate	Unexpected stream type or uncompressed data.
ZLib	no header, no checksum, rfc1951
GZip	2 byte header, 4 byte footer with adler32 checksum, rfc1950

Constructor & Destructor Documentation

DeflateStream() [1/3]

Ogre::DeflateStream::DeflateStream	(	const DataStreamPtr &	compressedStream,
		const String &	tmpFileName = "",
		size_t	avail_in = 0
	)

Constructor for creating unnamed stream wrapping another stream.

Parameters

compressedStream	The stream that this stream will use when reading / writing compressed data. The access mode from this stream will be matched.
tmpFileName	Path/Filename to be used for temporary storage of incoming data
avail_in	Available data length to be uncompressed. With it we can uncompress DataStream partly.

DeflateStream() [2/3]

Ogre::DeflateStream::DeflateStream	(	const String &	name,
		const DataStreamPtr &	compressedStream,
		const String &	tmpFileName = "",
		size_t	avail_in = 0
	)

Constructor for creating named stream wrapping another stream.

Parameters

name	The name to give this stream
compressedStream	The stream that this stream will use when reading / writing compressed data. The access mode from this stream will be matched.
tmpFileName	Path/Filename to be used for temporary storage of incoming data
avail_in	Available data length to be uncompressed. With it we can uncompress DataStream partly.

DeflateStream() [3/3]

Ogre::DeflateStream::DeflateStream	(	const String &	name,
		const DataStreamPtr &	compressedStream,
		StreamType	streamType,
		const String &	tmpFileName = "",
		size_t	avail_in = 0
	)

Constructor for creating named stream wrapping another stream.

Parameters

name	The name to give this stream
compressedStream	The stream that this stream will use when reading / writing compressed data. The access mode from this stream will be matched.
streamType	The type of compressed stream
tmpFileName	Path/Filename to be used for temporary storage of incoming data
avail_in	Available data length to be uncompressed. With it we can uncompress DataStream partly.

~DeflateStream()

Ogre::DeflateStream::~DeflateStream

(

)

Member Function Documentation

close()

void Ogre::DeflateStream::close ( void  )

virtual

Close the stream; this makes further operations invalid.

Implements Ogre::DataStream.

eof()

bool Ogre::DeflateStream::eof ( void  ) const

virtual

Returns true if the stream has reached the end.

Implements Ogre::DataStream.

getAccessMode()

uint16 Ogre::DataStream::getAccessMode ( ) const

inlineinherited

Gets the access mode of the stream.

getAsString()

virtual String Ogre::DataStream::getAsString ( void  )

virtualinherited

Returns a String containing the entire stream.

Remarks

This is a convenience method for text streams only, allowing you to retrieve a String object containing all the data in the stream.

getLine()

virtual String Ogre::DataStream::getLine ( bool  trimAfter = true )

virtualinherited

Returns a String containing the next line of data, optionally trimmed for whitespace.

Remarks

This is a convenience method for text streams only, allowing you to retrieve a String object containing the next line of data. The data is read up to the next newline character and the result trimmed if required.

Note

If you used this function, you must open the stream in binary mode, otherwise, it'll produce unexpected results.

Parameters

trimAfter

If true, the line is trimmed for whitespace (as in String.trim(true,true))

getName()

const String & Ogre::DataStream::getName ( void  )

inlineinherited

Returns the name of the stream, if it has one.

isCompressedStreamValid()

bool Ogre::DeflateStream::isCompressedStreamValid ( ) const

inline

Returns whether the compressed stream is valid deflated data.

Remarks

If you pass this class a READ stream which is not compressed with the deflate algorithm, this method returns false and all read commands will actually be executed as passthroughs as a fallback.

isReadable()

virtual bool Ogre::DataStream::isReadable ( ) const

inlinevirtualinherited

Reports whether this stream is readable.

isWriteable()

virtual bool Ogre::DataStream::isWriteable ( ) const

inlinevirtualinherited

Reports whether this stream is writeable.

operator delete() [1/3]

template<class Alloc >

void Ogre::AllocatedObject< Alloc >::operator delete ( void *  ptr )

inlineinherited

operator delete() [2/3]

template<class Alloc >

void Ogre::AllocatedObject< Alloc >::operator delete ( void *  ptr, const char *  , int  , const char *    )

inlineinherited

operator delete() [3/3]

template<class Alloc >

void Ogre::AllocatedObject< Alloc >::operator delete ( void *  ptr, void *    )

inlineinherited

operator delete[]() [1/2]

template<class Alloc >

void Ogre::AllocatedObject< Alloc >::operator delete[] ( void *  ptr )

inlineinherited

operator delete[]() [2/2]

template<class Alloc >

void Ogre::AllocatedObject< Alloc >::operator delete[] ( void *  ptr, const char *  , int  , const char *    )

inlineinherited

operator new() [1/3]

template<class Alloc >

void * Ogre::AllocatedObject< Alloc >::operator new ( size_t  sz )

inlineinherited

operator new() [2/3]

template<class Alloc >

void * Ogre::AllocatedObject< Alloc >::operator new ( size_t  sz, const char *  file, int  line, const char *  func  )

inlineinherited

operator new, with debug line info

operator new() [3/3]

template<class Alloc >

void * Ogre::AllocatedObject< Alloc >::operator new ( size_t  sz, void *  ptr  )

inlineinherited

placement operator new

operator new[]() [1/2]

template<class Alloc >

void * Ogre::AllocatedObject< Alloc >::operator new[] ( size_t  sz )

inlineinherited

operator new[]() [2/2]

template<class Alloc >

void * Ogre::AllocatedObject< Alloc >::operator new[] ( size_t  sz, const char *  file, int  line, const char *  func  )

inlineinherited

array operator new, with debug line info

operator>>()

template<typename T >

DataStream & Ogre::DataStream::operator>> ( T &  val )

inherited

read()

size_t Ogre::DeflateStream::read ( void *  buf, size_t  count  )

virtual

Read the requisite number of bytes from the stream, stopping at the end of the file.

Parameters

buf	Reference to a buffer pointer
count	Number of bytes to read

Returns

The number of bytes read

Implements Ogre::DataStream.

readLine()

virtual size_t Ogre::DataStream::readLine ( char *  buf, size_t  maxCount, const String &  delim = "\n"  )

virtualinherited

Get a single line from the stream.

Remarks

The delimiter character is not included in the data returned, and it is skipped over so the next read will occur after it. The buffer contents will include a terminating character.

Note

If you used this function, you must open the stream in binary mode, otherwise, it'll produce unexpected results.

Parameters

buf	Reference to a buffer pointer
maxCount	The maximum length of data to be read, excluding the terminating character
delim	The delimiter to stop at

Returns

The number of bytes read, excluding the terminating character

Reimplemented in Ogre::MemoryDataStream, and Ogre::FileStreamDataStream.

seek()

void Ogre::DeflateStream::seek ( size_t  pos )

virtual

Repositions the read point to a specified byte.

Implements Ogre::DataStream.

size()

size_t Ogre::DataStream::size ( void  ) const

inlineinherited

Returns the total size of the data to be read from the stream, or 0 if this is indeterminate for this stream.

skip()

void Ogre::DeflateStream::skip ( long  count )

virtual

Skip a defined number of bytes.

This can also be a negative value, in which case the file pointer rewinds a defined number of bytes.

Implements Ogre::DataStream.

skipLine()

virtual size_t Ogre::DataStream::skipLine ( const String &  delim = "\n" )

virtualinherited

Skip a single line from the stream.

Note

If you used this function, you must open the stream in binary mode, otherwise, it'll produce unexpected results.

Parameters

delim

The delimiter(s) to stop at

Returns

The number of bytes skipped

Reimplemented in Ogre::MemoryDataStream.

tell()

size_t Ogre::DeflateStream::tell ( void  ) const

virtual

Returns the current byte offset from beginning.

Implements Ogre::DataStream.

write()

size_t Ogre::DeflateStream::write ( const void *  buf, size_t  count  )

virtual

Write the requisite number of bytes from the stream (only applicable to streams that are not read-only)

Parameters

buf	Pointer to a buffer containing the bytes to write
count	Number of bytes to write

Returns

The number of bytes written

Reimplemented from Ogre::DataStream.

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The documentation for this class was generated from the following file:

• OgreDeflate.h