ZlibSaveFilter Struct Reference

Filter using Zlib compression. More...

Inheritance diagram for ZlibSaveFilter:

Public Member Functions
	ZlibSaveFilter (std::shared_ptr< SaveFilter > chain, uint8_t compression_level)
	Initialise this filter.
	~ZlibSaveFilter ()
	Clean up what we allocated.
void	WriteLoop (uint8_t *p, size_t len, int mode)
	Helper loop for writing the data.
void	Write (uint8_t *buf, size_t size) override
	Write a given number of bytes into the savegame.
void	Finish () override
	Prepare everything to finish writing the savegame.
Public Member Functions inherited from SaveFilter
	SaveFilter (std::shared_ptr< SaveFilter > chain)
	Initialise this filter.
virtual	~SaveFilter ()=default
	Make sure the writers are properly closed.

Data Fields
z_stream	z
	Stream state we are writing to.
uint8_t	fwrite_buf [MEMORY_CHUNK_SIZE]
	Buffer for writing to the file.
Data Fields inherited from SaveFilter
std::shared_ptr< SaveFilter >	chain
	Chained to the (savegame) filters.

Detailed Description

Filter using Zlib compression.

Definition at line 2495 of file saveload.cpp.

Constructor & Destructor Documentation

ZlibSaveFilter()

ZlibSaveFilter::ZlibSaveFilter ( std::shared_ptr< SaveFilter >  chain, uint8_t  compression_level  )

inline

Initialise this filter.

Parameters

chain	The next filter in this chain.
compression_level	The requested level of compression.

Definition at line 2504 of file saveload.cpp.

References SlError().

~ZlibSaveFilter()

ZlibSaveFilter::~ZlibSaveFilter ( )

inline

Clean up what we allocated.

Definition at line 2511 of file saveload.cpp.

Member Function Documentation

Finish()

void ZlibSaveFilter::Finish ( )

inlineoverridevirtual

Prepare everything to finish writing the savegame.

Reimplemented from SaveFilter.

Definition at line 2555 of file saveload.cpp.

References SaveFilter::chain, and WriteLoop().

Write()

void ZlibSaveFilter::Write ( uint8_t *  buf, size_t  len  )

inlineoverridevirtual

Write a given number of bytes into the savegame.

Parameters

buf	The bytes to write.
len	The number of bytes to write.

Implements SaveFilter.

Definition at line 2550 of file saveload.cpp.

References WriteLoop().

WriteLoop()

void ZlibSaveFilter::WriteLoop ( uint8_t *  p, size_t  len, int  mode  )

inline

Helper loop for writing the data.

Parameters

p	The bytes to write.
len	Amount of bytes to write.
mode	Mode for deflate.

For the poor next soul who sees many valgrind warnings of the "Conditional jump or move depends on uninitialised value(s)" kind: According to the author of zlib it is not a bug and it won't be fixed. http://groups.google.com/group/comp.compression/browse_thread/thread/b154b8def8c2a3ef/cdf9b8729ce17ee2 [Mark Adler, Feb 24 2004, 'zlib-1.2.1 valgrind warnings' in the newsgroup comp.compression]

Definition at line 2522 of file saveload.cpp.

References SaveFilter::chain, fwrite_buf, and SlError().

Referenced by Finish(), and Write().

Field Documentation

fwrite_buf

uint8_t ZlibSaveFilter::fwrite_buf[MEMORY_CHUNK_SIZE]

Buffer for writing to the file.

Definition at line 2497 of file saveload.cpp.

Referenced by WriteLoop().

z

z_stream ZlibSaveFilter::z

Stream state we are writing to.

Definition at line 2496 of file saveload.cpp.

---

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

• src/saveload/saveload.cpp