Common::Serializer Class Reference

#include <serializer.h>

Inheritance diagram for Common::Serializer:

Public Types
typedef uint32	Version

Public Member Functions
	Serializer (SeekableReadStream *in, WriteStream *out)
bool	isSaving ()
bool	isLoading ()
template<typename T >
void	syncAsByte (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsSByte (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsUint16LE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsUint16BE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsSint16LE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsSint16BE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsUint32LE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsUint32BE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsSint32LE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsSint32BE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsFloatLE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsFloatBE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsDoubleLE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncAsDoubleBE (T &val, Version minVersion=0, Version maxVersion=kLastVersion)
bool	err () const
void	clearErr ()
bool	syncVersion (Version currentVersion)
Version	getVersion () const
void	setVersion (Version version)
uint	bytesSynced () const
void	skip (uint32 size, Version minVersion=0, Version maxVersion=kLastVersion)
void	syncBytes (byte *buf, uint32 size, Version minVersion=0, Version maxVersion=kLastVersion)
bool	matchBytes (const char *magic, byte size, Version minVersion=0, Version maxVersion=kLastVersion)
void	syncString (String &str, Version minVersion=0, Version maxVersion=kLastVersion)
void	syncString32 (U32String &str, Version minVersion=0, Version maxVersion=kLastVersion)
template<typename T >
void	syncArray (T *arr, size_t entries, void(*serializer)(Serializer &, T &), Version minVersion=0, Version maxVersion=kLastVersion)

Static Public Member Functions
template<typename T >
static void	Uint32LE (Serializer &s, T &value)
template<typename T >
static void	Uint32BE (Serializer &s, T &value)
template<typename T >
static void	Sint32LE (Serializer &s, T &value)
template<typename T >
static void	Sint32BE (Serializer &s, T &value)
template<typename T >
static void	FloatLE (Serializer &s, T &value)
template<typename T >
static void	FloatBE (Serializer &s, T &value)
template<typename T >
static void	DoubleLE (Serializer &s, T &value)
template<typename T >
static void	DoubleBE (Serializer &s, T &value)
template<typename T >
static void	Uint16LE (Serializer &s, T &value)
template<typename T >
static void	Uint16BE (Serializer &s, T &value)
template<typename T >
static void	Sint16LE (Serializer &s, T &value)
template<typename T >
static void	Sint16BE (Serializer &s, T &value)
template<typename T >
static void	Byte (Serializer &s, T &value)
template<typename T >
static void	SByte (Serializer &s, T &value)

Static Public Attributes
static const Version	kLastVersion = 0xFFFFFFFF

Protected Attributes
SeekableReadStream *	_loadStream
WriteStream *	_saveStream
uint	_bytesSynced
Version	_version

Detailed Description

This class allows syncing / serializing data (primarily game savestates) between memory and Read/WriteStreams. It optionally supports versioning the serialized data (client code must use the syncVersion() method for this). This makes it possible to support multiple versions of a savegame format with a single codepath

This class was heavily inspired by the save/load code in the SCUMM engine.

Member Function Documentation

err()

bool Common::Serializer::err ( ) const

inline

Returns true if an I/O failure occurred. This flag is never cleared automatically. In order to clear it, client code has to call clearErr() explicitly.

clearErr()

void Common::Serializer::clearErr ( )

inline

Reset the I/O error status as returned by err().

syncVersion()

bool Common::Serializer::syncVersion ( Version  currentVersion )

inline

Sync the "version" of the savegame we are loading/creating.

Parameters

currentVersion

current format version, used when writing a new file

Returns

true if the version of the savestate is not too new.

getVersion()

Version Common::Serializer::getVersion ( ) const

inline

Return the version of the savestate being serialized. Useful if the engine needs to perform additional adjustments when loading old savestates.

setVersion()

void Common::Serializer::setVersion ( Version  version )

inline

Manually set the version

bytesSynced()

uint Common::Serializer::bytesSynced ( ) const

inline

Return the total number of bytes synced so far.

skip()

void Common::Serializer::skip ( uint32  size, Version  minVersion = 0, Version  maxVersion = kLastVersion  )

inline

Skip a number of bytes in the data stream. This is useful to skip obsolete fields in old savestates.

syncBytes()

void Common::Serializer::syncBytes ( byte *  buf, uint32  size, Version  minVersion = 0, Version  maxVersion = kLastVersion  )

inline

Sync a block of arbitrary fixed-length data.

matchBytes()

bool Common::Serializer::matchBytes ( const char *  magic, byte  size, Version  minVersion = 0, Version  maxVersion = kLastVersion  )

inline

Sync a 'magic id' of up to 256 bytes, and return whether it matched. When saving, this will simply write out the magic id and return true. When loading, this will read the specified number of bytes, compare it to the given magic id and return true on a match, false otherwise.

A typical magic id is a FOURCC like 'MAGI'.

Parameters

magic	magic id as a byte sequence
size	length of the magic id in bytes

Returns

true if the magic id matched, false otherwise

syncString()

void Common::Serializer::syncString ( String &  str, Version  minVersion = 0, Version  maxVersion = kLastVersion  )

inline

Sync a C-string, by treating it as a zero-terminated byte sequence.

syncString32()

void Common::Serializer::syncString32 ( U32String &  str, Version  minVersion = 0, Version  maxVersion = kLastVersion  )

inline

Sync a U32-string

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

• common/serializer.h