Utility class providing helper methods for reading / writing structured data held in a DataStream. More...

#include <OgreStreamSerialiser.h>

Inheritance diagram for Ogre::StreamSerialiser:

Classes
struct	Chunk
	Definition of a chunk of data in a file. More...

Public Types
enum	Endian { ENDIAN_AUTO , ENDIAN_BIG , ENDIAN_LITTLE }
	The endianness of files. More...

enum	RealStorageFormat { REAL_FLOAT , REAL_DOUBLE }
	The storage format of Real values. More...

Public Member Functions
	StreamSerialiser (const DataStreamPtr &stream, Endian endianMode=ENDIAN_AUTO, bool autoHeader=true, RealStorageFormat realFormat=REAL_FLOAT)
	Constructor.

virtual	~StreamSerialiser ()

virtual bool	eof () const
	Reports whether the stream is at the end of file.

virtual const Chunk *	getCurrentChunk () const
	Get the definition of the current chunk being read (if any).

size_t	getCurrentChunkDepth () const
	Report the current depth of the chunk nesting, whether reading or writing.

uint32	getCurrentChunkID () const
	Get the ID of the chunk that's currently being read/written, if any.

virtual Endian	getEndian () const
	Get the endian mode.

size_t	getOffsetFromChunkStart () const
	Get the current byte position relative to the start of the data section of the last chunk that was read or written.

virtual bool	isEndOfChunk (uint32 id)
	Return whether the current data pointer is at the end of the current chunk.

virtual uint32	peekNextChunkID ()
	Call this to 'peek' at the next chunk ID without permanently moving the stream pointer.

virtual void	read (AxisAlignedBox *aabb, size_t count=1)

virtual void	read (bool *val, size_t count=1)

virtual void	read (Matrix3 *m, size_t count=1)

virtual void	read (Matrix4 *m, size_t count=1)

virtual void	read (Node *node, size_t count=1)

virtual void	read (Plane *plane, size_t count=1)

virtual void	read (Quaternion *q, size_t count=1)

virtual void	read (Radian *angle, size_t count=1)

virtual void	read (Ray *ray, size_t count=1)

virtual void	read (Real *val, size_t count=1)

virtual void	read (Sphere *sphere, size_t count=1)

virtual void	read (String *string)

template<typename T >
void	read (T *pT, size_t count=1)
	Catch-all method to read primitive types.

virtual void	read (Vector2 *vec, size_t count=1)
	read a Vector3

virtual void	read (Vector3 *vec, size_t count=1)

virtual void	read (Vector4 *vec, size_t count=1)

virtual const Chunk *	readChunkBegin ()
	Reads the start of the next chunk in the file.

virtual const Chunk *	readChunkBegin (uint32 id, uint16 maxVersion, const String &msg=BLANKSTRING)
	Reads the start of the next chunk so long as it's of a given ID and version.

virtual void	readChunkEnd (uint32 id)
	Finish the reading of a chunk.

virtual void	readData (void *buf, size_t size, size_t count)
	Read arbitrary data from a stream.

virtual void	startDeflate (size_t avail_in=0)
	Start (un)compressing data.

virtual void	stopDeflate ()
	Stop (un)compressing data.

virtual void	undoReadChunk (uint32 id)
	Call this to 'rewind' the stream to just before the start of the current chunk.

virtual void	write (const AxisAlignedBox *aabb, size_t count=1)

virtual void	write (const bool *boolean, size_t count=1)

virtual void	write (const Matrix3 *m, size_t count=1)

virtual void	write (const Matrix4 *m, size_t count=1)

virtual void	write (const Node *node, size_t count=1)

virtual void	write (const Plane *plane, size_t count=1)

virtual void	write (const Quaternion *q, size_t count=1)

virtual void	write (const Radian *angle, size_t count=1)

virtual void	write (const Ray *ray, size_t count=1)

virtual void	write (const Real *val, size_t count=1)

virtual void	write (const Sphere *sphere, size_t count=1)

virtual void	write (const String *string)

template<typename T >
void	write (const T *pT, size_t count=1)
	Catch-all method to write primitive types.

virtual void	write (const Vector2 *vec, size_t count=1)

virtual void	write (const Vector3 *vec, size_t count=1)

virtual void	write (const Vector4 *vec, size_t count=1)

virtual void	writeChunkBegin (uint32 id, uint16 version=1)
	Begin writing a new chunk.

virtual void	writeChunkEnd (uint32 id)
	End writing a chunk.

virtual void	writeData (const void *buf, size_t size, size_t count)
	Write arbitrary data to a stream.

Static Public Member Functions
static uint32	makeIdentifier (const String &code)
	Pack a 4-character code into a 32-bit identifier.

Detailed Description

Utility class providing helper methods for reading / writing structured data held in a DataStream.

Remarks: The structure of a file read / written by this class is a series of 'chunks'. A chunk-based format has the advantage of being extensible later, and it's robust, in that a reader can skip chunks that they are not able (or willing) to process.

: Chunks are contained serially in the file, but they can also be nested in order both to provide context, and to group chunks together for potential skipping.

The data format of a chunk is as follows:

Chunk ID (32-bit uint). This can be any number unique in a context, except the numbers 0x0000, 0x0001 and 0x1000, which are reserved for Ogre's use
Chunk version (16-bit uint). Chunks can change over time so this version number reflects that
Length (32-bit uint). The length of the chunk data section, including nested chunks. Note that this length excludes this header, but includes the header of any nested chunks.
Checksum (32-bit uint). Checksum value generated from the above - basically lets us check this is a valid chunk.
Chunk data The 'Chunk data' section will contain chunk-specific data, which may include other nested chunks.

Member Enumeration Documentation

◆ Endian

enum Ogre::StreamSerialiser::Endian

The endianness of files.

Enumerator
ENDIAN_AUTO	Automatically determine endianness.
ENDIAN_BIG	Use big endian (0x1000 is serialised as 0x10 0x00)
ENDIAN_LITTLE	Use little endian (0x1000 is serialised as 0x00 0x10)

◆ RealStorageFormat

enum Ogre::StreamSerialiser::RealStorageFormat

The storage format of Real values.

Enumerator
REAL_FLOAT	Real is stored as float, reducing precision if you're using OGRE_DOUBLE_PRECISION.
REAL_DOUBLE	Real as stored as double, not useful unless you're using OGRE_DOUBLE_PRECISION.

Constructor & Destructor Documentation

◆ StreamSerialiser()

Ogre::StreamSerialiser::StreamSerialiser	(	const DataStreamPtr &	stream,
		Endian	endianMode = `ENDIAN_AUTO`,
		bool	autoHeader = `true`,
		RealStorageFormat	realFormat = `REAL_FLOAT`
	)

Constructor.

Parameters

stream	The stream on which you will read / write data.
endianMode	The endian mode in which to read / writedata. If left at the default, when writing the endian mode will be the native platform mode, and when reading it's expected that the first chunk encountered will be the header chunk, which will determine the endian mode.
autoHeader	If true, the first write or read to this stream will automatically read / write the header too. This is required if you set endianMode to ENDIAN_AUTO, but if you manually set the endian mode, then you can skip writing / reading the header if you wish, if for example this stream is midway through a file which has already included header information.
realFormat	Set the format you want to write reals in. Only useful for files that you're writing (since when reading this is picked up from the file), and can only be changed if autoHeader is true, since real format is stored in the header. Defaults to float unless you're using OGRE_DOUBLE_PRECISION.

◆ ~StreamSerialiser()

virtual Ogre::StreamSerialiser::~StreamSerialiser ( )

virtual

Member Function Documentation

◆ eof()

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

virtual

Reports whether the stream is at the end of file.

◆ getCurrentChunk()

virtual const Chunk * Ogre::StreamSerialiser::getCurrentChunk ( ) const

virtual

Get the definition of the current chunk being read (if any).

◆ getCurrentChunkDepth()

size_t Ogre::StreamSerialiser::getCurrentChunkDepth ( ) const

inline

Report the current depth of the chunk nesting, whether reading or writing.

Remarks: Returns how many levels of nested chunks are currently being processed, either writing or reading. In order to tidily finish, you must call read/writeChunkEnd this many times.

◆ getCurrentChunkID()

uint32 Ogre::StreamSerialiser::getCurrentChunkID ( ) const

Get the ID of the chunk that's currently being read/written, if any.

Returns: The id of the current chunk being read / written (at the tightest level of nesting), or zero if no chunk is being processed.

◆ getEndian()

virtual Endian Ogre::StreamSerialiser::getEndian ( ) const

inlinevirtual

Get the endian mode.

Remarks: If the result is ENDIAN_AUTO, this mode will change when the first piece of data is read / written.

◆ getOffsetFromChunkStart()

size_t Ogre::StreamSerialiser::getOffsetFromChunkStart ( ) const

Get the current byte position relative to the start of the data section of the last chunk that was read or written.

Returns: the offset. Note that a return value of 0 means that either the position is at the start of the chunk data section (ie right after the header), or that no chunk is currently active. Use getCurrentChunkID or getCurrentChunkDepth to determine if a chunk is active.

◆ isEndOfChunk()

virtual bool Ogre::StreamSerialiser::isEndOfChunk ( uint32 id )

virtual

Return whether the current data pointer is at the end of the current chunk.

Parameters

id	The id of the chunk that you were reading (for validation purposes)

◆ makeIdentifier()

static uint32 Ogre::StreamSerialiser::makeIdentifier ( const String & code )

static

Pack a 4-character code into a 32-bit identifier.

Remarks: You can use this to generate id's for your chunks based on friendlier 4-character codes rather than assigning numerical IDs, if you like.

Parameters

code	String to pack - must be 4 characters.

◆ peekNextChunkID()

virtual uint32 Ogre::StreamSerialiser::peekNextChunkID ( )

virtual

Call this to 'peek' at the next chunk ID without permanently moving the stream pointer.

◆ read() [1/16]

virtual void Ogre::StreamSerialiser::read	(	AxisAlignedBox *	aabb,
		size_t	count = `1`
	)

virtual

◆ read() [2/16]

virtual void Ogre::StreamSerialiser::read	(	bool *	val,
		size_t	count = `1`
	)

virtual

◆ read() [3/16]

virtual void Ogre::StreamSerialiser::read	(	Matrix3 *	m,
		size_t	count = `1`
	)

virtual

◆ read() [4/16]

virtual void Ogre::StreamSerialiser::read	(	Matrix4 *	m,
		size_t	count = `1`
	)

virtual

◆ read() [5/16]

virtual void Ogre::StreamSerialiser::read	(	Node *	node,
		size_t	count = `1`
	)

virtual

◆ read() [6/16]

virtual void Ogre::StreamSerialiser::read	(	Plane *	plane,
		size_t	count = `1`
	)

virtual

◆ read() [7/16]

virtual void Ogre::StreamSerialiser::read	(	Quaternion *	q,
		size_t	count = `1`
	)

virtual

◆ read() [8/16]

virtual void Ogre::StreamSerialiser::read	(	Radian *	angle,
		size_t	count = `1`
	)

virtual

◆ read() [9/16]

virtual void Ogre::StreamSerialiser::read	(	Ray *	ray,
		size_t	count = `1`
	)

virtual

◆ read() [10/16]

virtual void Ogre::StreamSerialiser::read	(	Real *	val,
		size_t	count = `1`
	)

virtual

◆ read() [11/16]

virtual void Ogre::StreamSerialiser::read	(	Sphere *	sphere,
		size_t	count = `1`
	)

virtual

◆ read() [12/16]

virtual void Ogre::StreamSerialiser::read ( String * string )

virtual

◆ read() [13/16]

template<typename T >

void Ogre::StreamSerialiser::read	(	T *	pT,
		size_t	count = `1`
	)

inline

Catch-all method to read primitive types.

◆ read() [14/16]

virtual void Ogre::StreamSerialiser::read	(	Vector2 *	vec,
		size_t	count = `1`
	)

virtual

read a Vector3

◆ read() [15/16]

virtual void Ogre::StreamSerialiser::read	(	Vector3 *	vec,
		size_t	count = `1`
	)

virtual

◆ read() [16/16]

virtual void Ogre::StreamSerialiser::read	(	Vector4 *	vec,
		size_t	count = `1`
	)

virtual

◆ readChunkBegin() [1/2]

virtual const Chunk * Ogre::StreamSerialiser::readChunkBegin ( )

virtual

Reads the start of the next chunk in the file.

Remarks: Files are serialised in a chunk-based manner, meaning that each section of data is prepended by a chunk header. After reading this chunk header, the next set of data is available directly afterwards.

Note: When you have finished with this chunk, you should call readChunkEnd. This will perform a bit of validation and clear the chunk from the stack.

Returns: The Chunk that comes next

◆ readChunkBegin() [2/2]

virtual const Chunk * Ogre::StreamSerialiser::readChunkBegin	(	uint32	id,
		uint16	maxVersion,
		const String &	msg = `BLANKSTRING`
	)

virtual

Reads the start of the next chunk so long as it's of a given ID and version.

Remarks: This method operates like readChunkBegin, except it checks the ID and version.

Parameters

id	The ID you're expecting. If the next chunk isn't of this ID, then the chunk read is undone and the method returns null.
maxVersion	The maximum version you're able to process. If the ID is correct but the version exceeds what is passed in here, the chunk is skipped over, the problem logged and null is returned.
msg	Descriptive text added to the log if versions are not compatible

Returns: The chunk if it passes the validation.

◆ readChunkEnd()

virtual void Ogre::StreamSerialiser::readChunkEnd ( uint32 id )

virtual

Finish the reading of a chunk.

Remarks: You can call this method at any point after calling readChunkBegin, even if you didn't read all the rest of the data in the chunk. If you did not read to the end of a chunk, this method will automatically skip over the remainder of the chunk and position the stream just after it.

Parameters

id	The id of the chunk that you were reading (for validation purposes)

◆ readData()

virtual void Ogre::StreamSerialiser::readData	(	void *	buf,
		size_t	size,
		size_t	count
	)

virtual

Read arbitrary data from a stream.

Parameters

buf	Pointer to bytes
size	The size of each element to read; each will be endian-flipped if necessary
count	The number of elements to read

◆ startDeflate()

virtual void Ogre::StreamSerialiser::startDeflate ( size_t avail_in = 0 )

virtual

Start (un)compressing data.

Parameters

avail_in Available bytes for uncompressing

◆ stopDeflate()

virtual void Ogre::StreamSerialiser::stopDeflate ( )

virtual

Stop (un)compressing data.

◆ undoReadChunk()

virtual void Ogre::StreamSerialiser::undoReadChunk ( uint32 id )

virtual

Call this to 'rewind' the stream to just before the start of the current chunk.

Remarks: The most common case of wanting to use this is if you'd calledReadChunkBegin(), but the chunk you read wasn't one you wanted to process, and rather than skipping over it (which readChunkEnd() would do), you want to backtrack and give something else an opportunity to read it.

Parameters

id	The id of the chunk that you were reading (for validation purposes)

◆ write() [1/16]

virtual void Ogre::StreamSerialiser::write	(	const AxisAlignedBox *	aabb,
		size_t	count = `1`
	)

virtual

◆ write() [2/16]

virtual void Ogre::StreamSerialiser::write	(	const bool *	boolean,
		size_t	count = `1`
	)

virtual

◆ write() [3/16]

virtual void Ogre::StreamSerialiser::write	(	const Matrix3 *	m,
		size_t	count = `1`
	)

virtual

◆ write() [4/16]

virtual void Ogre::StreamSerialiser::write	(	const Matrix4 *	m,
		size_t	count = `1`
	)

virtual

◆ write() [5/16]

virtual void Ogre::StreamSerialiser::write	(	const Node *	node,
		size_t	count = `1`
	)

virtual

◆ write() [6/16]

virtual void Ogre::StreamSerialiser::write	(	const Plane *	plane,
		size_t	count = `1`
	)

virtual

◆ write() [7/16]

virtual void Ogre::StreamSerialiser::write	(	const Quaternion *	q,
		size_t	count = `1`
	)

virtual

◆ write() [8/16]

virtual void Ogre::StreamSerialiser::write	(	const Radian *	angle,
		size_t	count = `1`
	)

virtual

◆ write() [9/16]

virtual void Ogre::StreamSerialiser::write	(	const Ray *	ray,
		size_t	count = `1`
	)

virtual

◆ write() [10/16]

virtual void Ogre::StreamSerialiser::write	(	const Real *	val,
		size_t	count = `1`
	)

virtual

◆ write() [11/16]

virtual void Ogre::StreamSerialiser::write	(	const Sphere *	sphere,
		size_t	count = `1`
	)

virtual

◆ write() [12/16]

virtual void Ogre::StreamSerialiser::write ( const String * string )

virtual

◆ write() [13/16]

template<typename T >

void Ogre::StreamSerialiser::write	(	const T *	pT,
		size_t	count = `1`
	)

inline

Catch-all method to write primitive types.

◆ write() [14/16]

virtual void Ogre::StreamSerialiser::write	(	const Vector2 *	vec,
		size_t	count = `1`
	)

virtual

◆ write() [15/16]

virtual void Ogre::StreamSerialiser::write	(	const Vector3 *	vec,
		size_t	count = `1`
	)

virtual

◆ write() [16/16]

virtual void Ogre::StreamSerialiser::write	(	const Vector4 *	vec,
		size_t	count = `1`
	)

virtual

◆ writeChunkBegin()

virtual void Ogre::StreamSerialiser::writeChunkBegin	(	uint32	id,
		uint16	version = `1`
	)

virtual

Begin writing a new chunk.

Remarks: This starts the process of writing a new chunk to the stream. This will write the chunk header for you, and store a pointer so that the class can automatically go back and fill in the size for you later should you need it to. If you have already begun a chunk without ending it, then this method will start a nested chunk within it. Once written, you can then start writing chunk-specific data into your stream.

Note: If this is the first chunk in the file

Parameters

id	The identifier of the new chunk. Any value that's unique in the file context is valid, except for the numbers 0x0001 and 0x1000 which are reserved for internal header identification use.
version	The version of the chunk you're writing

◆ writeChunkEnd()

virtual void Ogre::StreamSerialiser::writeChunkEnd ( uint32 id )

virtual

End writing a chunk.

Parameters

id	The identifier of the chunk - this is really just a safety check, since you can only end the chunk you most recently started.

◆ writeData()

virtual void Ogre::StreamSerialiser::writeData	(	const void *	buf,
		size_t	size,
		size_t	count
	)

virtual

Write arbitrary data to a stream.

Parameters

buf	Pointer to bytes
size	The size of each element to write; each will be endian-flipped if necessary
count	The number of elements to write

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

OgreStreamSerialiser.h

Classes

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ Endian

◆ RealStorageFormat

Constructor & Destructor Documentation

◆ StreamSerialiser()

◆ ~StreamSerialiser()

Member Function Documentation

◆ eof()

◆ getCurrentChunk()

◆ getCurrentChunkDepth()

◆ getCurrentChunkID()

◆ getEndian()

◆ getOffsetFromChunkStart()

◆ isEndOfChunk()

◆ makeIdentifier()

◆ peekNextChunkID()

◆ read() [1/16]

◆ read() [2/16]

◆ read() [3/16]

◆ read() [4/16]

◆ read() [5/16]

◆ read() [6/16]

◆ read() [7/16]

◆ read() [8/16]

◆ read() [9/16]

◆ read() [10/16]

◆ read() [11/16]

◆ read() [12/16]

◆ read() [13/16]

◆ read() [14/16]

◆ read() [15/16]

◆ read() [16/16]

◆ readChunkBegin() [1/2]

◆ readChunkBegin() [2/2]

◆ readChunkEnd()

◆ readData()

◆ startDeflate()

◆ stopDeflate()

◆ undoReadChunk()

◆ write() [1/16]

◆ write() [2/16]

◆ write() [3/16]

◆ write() [4/16]

◆ write() [5/16]

◆ write() [6/16]

◆ write() [7/16]

◆ write() [8/16]

◆ write() [9/16]

◆ write() [10/16]

◆ write() [11/16]

◆ write() [12/16]

◆ write() [13/16]

◆ write() [14/16]

◆ write() [15/16]

◆ write() [16/16]

◆ writeChunkBegin()

◆ writeChunkEnd()

◆ writeData()