mysql::binlog::event::compression::Zstd_dec Class Reference

Decompressor class that uses the ZSTD library. More...

#include <zstd_dec.h>

Inheritance diagram for mysql::binlog::event::compression::Zstd_dec:

Public Types
using	Memory_resource_t = mysql::allocators::Memory_resource
using	Char_t = unsigned char
using	Grow_constraint_t = mysql::containers::buffers::Grow_constraint
using	Size_t = mysql::containers::buffers::Buffer_view< Char_t >::Size_t
Public Types inherited from mysql::binlog::event::compression::Decompressor
using	Char_t = unsigned char
using	Size_t = mysql::containers::buffers::Buffer_view< Char_t >::Size_t
using	Managed_buffer_t = mysql::containers::buffers::Managed_buffer< Char_t >
using	Grow_constraint_t = mysql::containers::buffers::Grow_constraint

Public Member Functions
	Zstd_dec (const Memory_resource_t &memory_resource=Memory_resource_t())
	~Zstd_dec () override
	Zstd_dec (const Zstd_dec &)=delete
	Zstd_dec (const Zstd_dec &&)=delete
Zstd_dec &	operator= (const Zstd_dec &)=delete
Zstd_dec &	operator= (const Zstd_dec &&)=delete
Public Member Functions inherited from mysql::binlog::event::compression::Decompressor
	Decompressor ()=default
	Decompressor (const Decompressor &)=delete
	Decompressor (const Decompressor &&)=delete
const Decompressor &	operator= (const Decompressor &)=delete
const Decompressor &	operator= (const Decompressor &&)=delete
virtual	~Decompressor ()=default
type	get_type_code () const
void	reset ()
	Reset the frame. More...
template<class Input_char_t >
void	feed (const Input_char_t *input_data, Size_t input_size)
	Submit data to decompress. More...
Decompress_status	decompress (Managed_buffer_t &out, Size_t output_size)
	Decompress an exact, given number of bytes. More...
std::pair< Decompress_status, Size_t >	decompress (Char_t *out, Size_t output_size)
	Decompress an exact, given number of bytes. More...
Grow_constraint_t	get_grow_constraint_hint () const
	Return a Grow_constraint that may be used with the Managed_buffer storing the output, in order to optimize memory usage for a particular compression algorithm. More...

Static Public Attributes
static constexpr type	type_code = ZSTD

Private Member Functions
type	do_get_type_code () const override
void	do_reset () override
	Implement do_reset. More...
void	do_feed (const Char_t *input_data, Size_t input_size) override
	Implement feed. More...
std::pair< Decompress_status, Size_t >	do_decompress (Char_t *out, Size_t output_size) override
	Implement decompress. More...
Grow_constraint_t	do_get_grow_constraint_hint () const override
	Implement get_grow_constraint_hint. More...
void	destroy ()
	Deallocate the ZSTD decompression context. More...

Static Private Member Functions
static void *	zstd_mem_res_alloc (void *opaque, size_t size)
static void	zstd_mem_res_free (void *opaque, void *address)

Private Attributes
ZSTD_DStream *	m_ctx {nullptr}
	ZSTD decompression context object. More...
ZSTD_inBuffer	m_ibuf {nullptr, 0, 0}
	ZSTD input buffer. More...
bool	m_frame_boundary = false
Memory_resource_t	m_memory_resource
	Instrumented memory allocator object. More...
ZSTD_customMem	m_zstd_custom_mem
	ZSTD memory allocator objects and functions. More...

Detailed Description

Decompressor class that uses the ZSTD library.

Member Typedef Documentation

Char_t

using mysql::binlog::event::compression::Decompressor::Char_t = unsigned char

Grow_constraint_t

using mysql::binlog::event::compression::Decompressor::Grow_constraint_t = mysql::containers::buffers::Grow_constraint

Memory_resource_t

using mysql::binlog::event::compression::Zstd_dec::Memory_resource_t = mysql::allocators::Memory_resource

Size_t

using mysql::binlog::event::compression::Decompressor::Size_t = mysql::containers::buffers::Buffer_view<Char_t>::Size_t

Constructor & Destructor Documentation

Zstd_dec() [1/3]

mysql::binlog::event::compression::Zstd_dec::Zstd_dec

(

const Memory_resource_t &

memory_resource = Memory_resource_t()

)

~Zstd_dec()

mysql::binlog::event::compression::Zstd_dec::~Zstd_dec ( )

override

Zstd_dec() [2/3]

mysql::binlog::event::compression::Zstd_dec::Zstd_dec ( const Zstd_dec &  )

delete

Zstd_dec() [3/3]

mysql::binlog::event::compression::Zstd_dec::Zstd_dec ( const Zstd_dec &&  )

delete

Member Function Documentation

destroy()

void mysql::binlog::event::compression::Zstd_dec::destroy ( )

private

Deallocate the ZSTD decompression context.

do_decompress()

std::pair< Decompress_status, Decompressor::Size_t > mysql::binlog::event::compression::Zstd_dec::do_decompress ( Char_t *  out, Size_t  output_size  )

overrideprivatevirtual

Implement decompress.

This differs from decompress in that it does not have to reset the frame when returning out_of_memory or corrupted; the caller does that.

Implements mysql::binlog::event::compression::Decompressor.

do_feed()

void mysql::binlog::event::compression::Zstd_dec::do_feed ( const Char_t *  input_data, Size_t  input_size  )

overrideprivatevirtual

Implement feed.

Implements mysql::binlog::event::compression::Decompressor.

do_get_grow_constraint_hint()

Decompressor::Grow_constraint_t mysql::binlog::event::compression::Zstd_dec::do_get_grow_constraint_hint ( ) const

overrideprivatevirtual

Implement get_grow_constraint_hint.

In this base class, the function returns a default-constructed Grow_constraint, i.e., one which does not limit the Grow_calculator.

Reimplemented from mysql::binlog::event::compression::Decompressor.

do_get_type_code()

type mysql::binlog::event::compression::Zstd_dec::do_get_type_code ( ) const

overrideprivatevirtual

Returns

ZSTD

Implements mysql::binlog::event::compression::Decompressor.

do_reset()

void mysql::binlog::event::compression::Zstd_dec::do_reset ( )

overrideprivatevirtual

Implement do_reset.

Implements mysql::binlog::event::compression::Decompressor.

operator=() [1/2]

Zstd_dec & mysql::binlog::event::compression::Zstd_dec::operator= ( const Zstd_dec &&  )

delete

operator=() [2/2]

Zstd_dec & mysql::binlog::event::compression::Zstd_dec::operator= ( const Zstd_dec &  )

delete

zstd_mem_res_alloc()

void * mysql::binlog::event::compression::Zstd_dec::zstd_mem_res_alloc ( void *  opaque, size_t  size  )

staticprivate

zstd_mem_res_free()

void mysql::binlog::event::compression::Zstd_dec::zstd_mem_res_free ( void *  opaque, void *  address  )

staticprivate

Member Data Documentation

m_ctx

ZSTD_DStream* mysql::binlog::event::compression::Zstd_dec::m_ctx {nullptr}

private

ZSTD decompression context object.

m_frame_boundary

bool mysql::binlog::event::compression::Zstd_dec::m_frame_boundary = false

private

m_ibuf

ZSTD_inBuffer mysql::binlog::event::compression::Zstd_dec::m_ibuf {nullptr, 0, 0}

private

ZSTD input buffer.

m_memory_resource

Memory_resource_t mysql::binlog::event::compression::Zstd_dec::m_memory_resource

private

Instrumented memory allocator object.

m_zstd_custom_mem

ZSTD_customMem mysql::binlog::event::compression::Zstd_dec::m_zstd_custom_mem

private

ZSTD memory allocator objects and functions.

type_code

constexpr type mysql::binlog::event::compression::Zstd_dec::type_code = ZSTD

staticconstexpr

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

• libs/mysql/binlog/event/compression/zstd_dec.h
• libs/mysql/binlog/event/compression/zstd_dec.cpp