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 Types
enum	AccessMode { READ = 1, WRITE = 2 }

Public Member Functions
	MemoryDataStream (void *pMem, size_t size, bool freeOnClose=false, bool readOnly=false)
	Wrap an existing memory chunk in a stream. More...
	MemoryDataStream (const String &name, void *pMem, size_t size, bool freeOnClose=false, bool readOnly=false)
	Wrap an existing memory chunk in a named stream. More...
	MemoryDataStream (DataStream &sourceStream, bool freeOnClose=true, bool readOnly=false)
	Create a stream which pre-buffers the contents of another stream. More...
	MemoryDataStream (DataStreamPtr &sourceStream, bool freeOnClose=true, bool readOnly=false)
	Create a stream which pre-buffers the contents of another stream. More...
	MemoryDataStream (const String &name, DataStream &sourceStream, bool freeOnClose=true, bool readOnly=false)
	Create a named stream which pre-buffers the contents of another stream. More...
	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. More...
	MemoryDataStream (size_t size, bool freeOnClose=true, bool readOnly=false)
	Create a stream with a brand new empty memory chunk. More...
	MemoryDataStream (const String &name, size_t size, bool freeOnClose=true, bool readOnly=false)
	Create a named stream with a brand new empty memory chunk. More...
	~MemoryDataStream ()
void	close (void)
	Close the stream; this makes further operations invalid. More...
bool	eof (void) const
	Returns true if the stream has reached the end. More...
uint16	getAccessMode () const
	Gets the access mode of the stream. More...
virtual String	getAsString (void)
	Returns a String containing the entire stream. More...
uchar *	getCurrentPtr (void)
	Get a pointer to the current position in the memory block this stream holds. More...
virtual String	getLine (bool trimAfter=true)
	Returns a String containing the next line of data, optionally trimmed for whitespace. More...
const String &	getName (void)
	Returns the name of the stream, if it has one. More...
uchar *	getPtr (void)
	Get a pointer to the start of the memory block this stream holds. More...
virtual bool	isReadable () const
	Reports whether this stream is readable. More...
virtual bool	isWriteable () const
	Reports whether this stream is writeable. More...
void	operator delete (void *ptr)
void	operator delete (void *ptr, void *)
void	operator delete (void *ptr, const char *, int, const char *)
void	operator delete[] (void *ptr)
void	operator delete[] (void *ptr, const char *, int, const char *)
void *	operator new (size_t sz, const char *file, int line, const char *func)
	operator new, with debug line info More...
void *	operator new (size_t sz)
void *	operator new (size_t sz, void *ptr)
	placement operator new More...
void *	operator new[] (size_t sz, const char *file, int line, const char *func)
	array operator new, with debug line info More...
void *	operator new[] (size_t sz)
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. More...
size_t	readLine (char *buf, size_t maxCount, const String &delim="\)
	Get a single line from the stream. More...
void	seek (size_t pos)
	Repositions the read point to a specified byte. More...
void	setFreeOnClose (bool free)
	Sets whether or not to free the encapsulated memory on close. More...
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. More...
void	skip (long count)
	Skip a defined number of bytes. More...
size_t	skipLine (const String &delim="\)
	Skip a single line from the stream. More...
size_t	tell (void) const
	Returns the current byte offset from beginning. More...
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) More...

Detailed Description

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

Member Enumeration Documentation

AccessMode

enum Ogre::DataStream::AccessMode

inherited

Enumerator
READ
WRITE

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.

Remarks

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	(	DataStreamPtr &	sourceStream,
		bool	freeOnClose = true,
		bool	readOnly = false
	)

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

Remarks

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.

Remarks

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.

Remarks

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

close()

void Ogre::MemoryDataStream::close ( void  )

virtual

Close the stream; this makes further operations invalid.

Implements Ogre::DataStream.

eof()

bool Ogre::MemoryDataStream::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.

getCurrentPtr()

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

inline

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

References Ogre::StaticCache< cacheSize >::read().

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.

getPtr()

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

inline

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

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, void *    )

inlineinherited

operator delete() [3/3]

template<class Alloc >

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

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, const char *  file, int  line, const char *  func  )

inlineinherited

operator new, with debug line info

operator new() [2/3]

template<class Alloc >

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

inlineinherited

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, const char *  file, int  line, const char *  func  )

inlineinherited

array operator new, with debug line info

operator new[]() [2/2]

template<class Alloc >

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

inlineinherited

operator>>()

template<typename T >

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

inherited

read()

size_t Ogre::MemoryDataStream::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()

size_t Ogre::MemoryDataStream::readLine ( char *  buf, size_t  maxCount  )

virtual

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 from Ogre::DataStream.

seek()

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

virtual

Repositions the read point to a specified byte.

Implements Ogre::DataStream.

setFreeOnClose()

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

inline

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

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::MemoryDataStream::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()

size_t Ogre::MemoryDataStream::skipLine ( )

virtual

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 from Ogre::DataStream.

tell()

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

virtual

Returns the current byte offset from beginning.

Implements Ogre::DataStream.

write()

size_t Ogre::MemoryDataStream::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.

---

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

• OgreDataStream.h