Ogre::MemoryDataStream Class Reference

Common subclass of DataStream for handling data from chunks of memory. More...

#include <OgreDataStream.h>

Inheritance diagram for Ogre::MemoryDataStream:

Public Member Functions
	MemoryDataStream (const DataStreamPtr &sourceStream, bool freeOnClose=true, bool readOnly=false)
	Create a stream which pre-buffers the contents of another stream.
	MemoryDataStream (const String &name, const DataStreamPtr &sourceStream, bool freeOnClose=true, bool readOnly=false)
	Create a named stream which pre-buffers the contents of another stream.
	MemoryDataStream (const String &name, DataStream &sourceStream, bool freeOnClose=true, bool readOnly=false)
	Create a named stream which pre-buffers the contents of another stream.
	MemoryDataStream (const String &name, size_t size, bool freeOnClose=true, bool readOnly=false)
	Create a named stream with a brand new empty memory chunk.
	MemoryDataStream (const String &name, void *pMem, size_t size, bool freeOnClose=false, bool readOnly=false)
	Wrap an existing memory chunk in a named stream.
	MemoryDataStream (DataStream &sourceStream, bool freeOnClose=true, bool readOnly=false)
	Create a stream which pre-buffers the contents of another stream.
	MemoryDataStream (size_t size, bool freeOnClose=true, bool readOnly=false)
	Create a stream with a brand new empty memory chunk.
	MemoryDataStream (void *pMem, size_t size, bool freeOnClose=false, bool readOnly=false)
	Wrap an existing memory chunk in a stream.
	~MemoryDataStream ()
void	close (void) override
	Close the stream; this makes further operations invalid.
bool	eof (void) const override
	Returns true if the stream has reached the end.
uchar *	getCurrentPtr (void)
	Get a pointer to the current position in the memory block this stream holds.
uchar *	getPtr (void)
	Get a pointer to the start of the memory block this stream holds.
size_t	read (void *buf, size_t count) override
	Read the requisite number of bytes from the stream, stopping at the end of the file.
size_t	readLine (char *buf, size_t maxCount, const String &delim="\n") override
	Get a single line from the stream.
void	seek (size_t pos) override
	Repositions the read point to a specified byte.
void	setFreeOnClose (bool free)
	Sets whether or not to free the encapsulated memory on close.
void	skip (long count) override
	Skip a defined number of bytes.
size_t	skipLine (const String &delim="\n") override
	Skip a single line from the stream.
size_t	tell (void) const override
	Returns the current byte offset from beginning.
size_t	write (const void *buf, size_t count) override
	Write the requisite number of bytes from the stream (only applicable to streams that are not read-only)
Public Member Functions inherited from Ogre::DataStream
	DataStream (const String &name, uint16 accessMode=READ)
	Constructor for creating named streams.
	DataStream (uint16 accessMode=READ)
	Constructor for creating unnamed streams.
virtual	~DataStream ()
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.
virtual bool	isReadable () const
	Reports whether this stream is readable.
virtual bool	isWriteable () const
	Reports whether this stream is writeable.
template<typename T >
DataStream &	operator>> (T &val)
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.

Additional Inherited Members
Public Types inherited from Ogre::DataStream
enum	AccessMode { READ = 1 , WRITE = 2 }

Detailed Description

Common subclass of DataStream for handling data from chunks of memory.

Constructor & Destructor Documentation

MemoryDataStream() [1/8]

Ogre::MemoryDataStream::MemoryDataStream	(	void *	pMem,
		size_t	size,
		bool	freeOnClose = false,
		bool	readOnly = false
	)

Wrap an existing memory chunk in a stream.

Parameters

pMem	Pointer to the existing memory
size	The size of the memory chunk in bytes
freeOnClose	If true, the memory associated will be destroyed when the stream is closed. Note: it's important that if you set this option to true, that you allocated the memory using OGRE_ALLOC_T with a category of MEMCATEGORY_GENERAL to ensure the freeing of memory matches up.
readOnly	Whether to make the stream on this memory read-only once created

MemoryDataStream() [2/8]

Ogre::MemoryDataStream::MemoryDataStream	(	const String &	name,
		void *	pMem,
		size_t	size,
		bool	freeOnClose = false,
		bool	readOnly = false
	)

Wrap an existing memory chunk in a named stream.

Parameters

name	The name to give the stream
pMem	Pointer to the existing memory
size	The size of the memory chunk in bytes
freeOnClose	If true, the memory associated will be destroyed when the stream is destroyed. Note: it's important that if you set this option to true, that you allocated the memory using OGRE_ALLOC_T with a category of MEMCATEGORY_GENERAL ensure the freeing of memory matches up.
readOnly	Whether to make the stream on this memory read-only once created

MemoryDataStream() [3/8]

Ogre::MemoryDataStream::MemoryDataStream	(	DataStream &	sourceStream,
		bool	freeOnClose = true,
		bool	readOnly = false
	)

Create a stream which pre-buffers the contents of another stream.

This constructor can be used to intentionally read in the entire contents of another stream, copying them to the internal buffer and thus making them available in memory as a single unit.

Parameters

sourceStream	Another DataStream which will provide the source of data
freeOnClose	If true, the memory associated will be destroyed when the stream is destroyed.
readOnly	Whether to make the stream on this memory read-only once created

MemoryDataStream() [4/8]

Ogre::MemoryDataStream::MemoryDataStream	(	const DataStreamPtr &	sourceStream,
		bool	freeOnClose = true,
		bool	readOnly = false
	)

Create a stream which pre-buffers the contents of another stream.

This constructor can be used to intentionally read in the entire contents of another stream, copying them to the internal buffer and thus making them available in memory as a single unit.

Parameters

sourceStream	Another DataStream which will provide the source of data
freeOnClose	If true, the memory associated will be destroyed when the stream is destroyed.
readOnly	Whether to make the stream on this memory read-only once created

MemoryDataStream() [5/8]

Ogre::MemoryDataStream::MemoryDataStream	(	const String &	name,
		DataStream &	sourceStream,
		bool	freeOnClose = true,
		bool	readOnly = false
	)

Create a named stream which pre-buffers the contents of another stream.

This constructor can be used to intentionally read in the entire contents of another stream, copying them to the internal buffer and thus making them available in memory as a single unit.

Parameters

name	The name to give the stream
sourceStream	Another DataStream which will provide the source of data
freeOnClose	If true, the memory associated will be destroyed when the stream is destroyed.
readOnly	Whether to make the stream on this memory read-only once created

MemoryDataStream() [6/8]

Ogre::MemoryDataStream::MemoryDataStream	(	const String &	name,
		const DataStreamPtr &	sourceStream,
		bool	freeOnClose = true,
		bool	readOnly = false
	)

Create a named stream which pre-buffers the contents of another stream.

This constructor can be used to intentionally read in the entire contents of another stream, copying them to the internal buffer and thus making them available in memory as a single unit.

Parameters

name	The name to give the stream
sourceStream	Another DataStream which will provide the source of data
freeOnClose	If true, the memory associated will be destroyed when the stream is destroyed.
readOnly	Whether to make the stream on this memory read-only once created

MemoryDataStream() [7/8]

Ogre::MemoryDataStream::MemoryDataStream	(	size_t	size,
		bool	freeOnClose = true,
		bool	readOnly = false
	)

Create a stream with a brand new empty memory chunk.

Parameters

size	The size of the memory chunk to create in bytes
freeOnClose	If true, the memory associated will be destroyed when the stream is destroyed.
readOnly	Whether to make the stream on this memory read-only once created

MemoryDataStream() [8/8]

Ogre::MemoryDataStream::MemoryDataStream	(	const String &	name,
		size_t	size,
		bool	freeOnClose = true,
		bool	readOnly = false
	)

Create a named stream with a brand new empty memory chunk.

Parameters

name	The name to give the stream
size	The size of the memory chunk to create in bytes
freeOnClose	If true, the memory associated will be destroyed when the stream is destroyed.
readOnly	Whether to make the stream on this memory read-only once created

~MemoryDataStream()

Ogre::MemoryDataStream::~MemoryDataStream

(

)

Member Function Documentation

getPtr()

uchar * Ogre::MemoryDataStream::getPtr ( void  )

inline

Get a pointer to the start of the memory block this stream holds.

getCurrentPtr()

uchar * Ogre::MemoryDataStream::getCurrentPtr ( void  )

inline

Get a pointer to the current position in the memory block this stream holds.

read()

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

overridevirtual

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.

write()

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

overridevirtual

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.

readLine()

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

overridevirtual

Get a single line from the stream.

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 from Ogre::DataStream.

skipLine()

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

overridevirtual

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.

delim The delimiter(s) to stop at

Returns

The number of bytes skipped

Reimplemented from Ogre::DataStream.

skip()

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

overridevirtual

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.

seek()

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

overridevirtual

Repositions the read point to a specified byte.

Implements Ogre::DataStream.

tell()

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

overridevirtual

Returns the current byte offset from beginning.

Implements Ogre::DataStream.

eof()

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

overridevirtual

Returns true if the stream has reached the end.

Implements Ogre::DataStream.

close()

void Ogre::MemoryDataStream::close ( void  )

overridevirtual

Close the stream; this makes further operations invalid.

Implements Ogre::DataStream.

setFreeOnClose()

void Ogre::MemoryDataStream::setFreeOnClose ( bool  free )

inline

Sets whether or not to free the encapsulated memory on close.

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

• OgreDataStream.h