Ogre::DataStream Class Reference

General purpose class used for encapsulating the reading and writing of data. More...

#include <OgreDataStream.h>

Inheritance diagram for Ogre::DataStream:

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

Public Member Functions
	DataStream (const String &name, uint16 accessMode=READ)
	Constructor for creating named streams.
	DataStream (uint16 accessMode=READ)
	Constructor for creating unnamed streams.
virtual	~DataStream ()
virtual void	close ()=0
	Close the stream; this makes further operations invalid.
virtual bool	eof () const =0
	Returns true if the stream has reached the end.
uint16	getAccessMode () const
	Gets the access mode of the stream.
virtual String	getAsString ()
	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 ()
	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)
virtual size_t	read (void *buf, size_t count)=0
	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.
virtual void	seek (size_t pos)=0
	Repositions the read point to a specified byte.
size_t	size () const
	Returns the total size of the data to be read from the stream, or 0 if this is indeterminate for this stream.
virtual void	skip (long count)=0
	Skip a defined number of bytes.
virtual size_t	skipLine (const String &delim="\n")
	Skip a single line from the stream.
virtual size_t	tell () const =0
	Returns the current byte offset from beginning.
virtual 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

General purpose class used for encapsulating the reading and writing of data.

Remarks

This class performs basically the same tasks as std::basic_istream, except that it does not have any formatting capabilities, and is designed to be subclassed to receive data from multiple sources, including libraries which have no compatibility with the STL's stream interfaces. As such, this is an abstraction of a set of wrapper classes which pretend to be standard stream classes but can actually be implemented quite differently.

Generally, if a plugin or application provides an ArchiveFactory, it should also provide a DataStream subclass which will be used to stream data out of that Archive implementation, unless it can use one of the common implementations included.

Note

Ogre makes no guarantees about thread safety, for performance reasons. If you wish to access stream data asynchronously then you should organise your own mutexes to avoid race conditions.

Member Enumeration Documentation

AccessMode

enum Ogre::DataStream::AccessMode

Enumerator
READ
WRITE

Constructor & Destructor Documentation

DataStream() [1/2]

Ogre::DataStream::DataStream ( uint16  accessMode = READ )

inline

Constructor for creating unnamed streams.

DataStream() [2/2]

Ogre::DataStream::DataStream ( const String &  name, uint16  accessMode = READ  )

inline

Constructor for creating named streams.

~DataStream()

virtual Ogre::DataStream::~DataStream ( )

inlinevirtual

Member Function Documentation

close()

virtual void Ogre::DataStream::close ( )

pure virtual

Close the stream; this makes further operations invalid.

Implemented in Ogre::MemoryDataStream, Ogre::FileStreamDataStream, Ogre::FileHandleDataStream, Ogre::DeflateStream, and Ogre::ZipDataStream.

eof()

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

pure virtual

Returns true if the stream has reached the end.

Implemented in Ogre::MemoryDataStream, Ogre::FileStreamDataStream, Ogre::FileHandleDataStream, Ogre::DeflateStream, and Ogre::ZipDataStream.

getAccessMode()

uint16 Ogre::DataStream::getAccessMode ( ) const

inline

Gets the access mode of the stream.

getAsString()

virtual String Ogre::DataStream::getAsString ( )

virtual

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 )

virtual

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 ( )

inline

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

isReadable()

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

inlinevirtual

Reports whether this stream is readable.

isWriteable()

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

inlinevirtual

Reports whether this stream is writeable.

operator>>()

template<typename T >

DataStream & Ogre::DataStream::operator>>

(

T &

val

)

read()

virtual size_t Ogre::DataStream::read ( void *  buf, size_t  count  )

pure 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

Implemented in Ogre::MemoryDataStream, Ogre::FileStreamDataStream, Ogre::FileHandleDataStream, Ogre::DeflateStream, and Ogre::ZipDataStream.

readLine()

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

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

seek()

virtual void Ogre::DataStream::seek ( size_t  pos )

pure virtual

Repositions the read point to a specified byte.

Implemented in Ogre::MemoryDataStream, Ogre::FileStreamDataStream, Ogre::FileHandleDataStream, Ogre::DeflateStream, and Ogre::ZipDataStream.

size()

size_t Ogre::DataStream::size ( ) const

inline

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

skip()

virtual void Ogre::DataStream::skip ( long  count )

pure 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.

Implemented in Ogre::MemoryDataStream, Ogre::FileStreamDataStream, Ogre::FileHandleDataStream, Ogre::DeflateStream, and Ogre::ZipDataStream.

skipLine()

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

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 in Ogre::MemoryDataStream.

tell()

virtual size_t Ogre::DataStream::tell ( ) const

pure virtual

Returns the current byte offset from beginning.

Implemented in Ogre::MemoryDataStream, Ogre::FileStreamDataStream, Ogre::FileHandleDataStream, Ogre::DeflateStream, and Ogre::ZipDataStream.

write()

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

inlinevirtual

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 in Ogre::MemoryDataStream, Ogre::FileStreamDataStream, Ogre::FileHandleDataStream, Ogre::DeflateStream, and Ogre::ZipDataStream.

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

• OgreDataStream.h