lob::zReader Struct Reference

Fetch compressed BLOB. More...

#include <lob0lob.h>

Public Member Functions
	zReader (const ReadContext &ctx)
	Constructor. More...
dberr_t	fetch ()
	Fetch the BLOB. More...
dberr_t	fetch_page ()
	Fetch one BLOB page. More...
ulint	length () const
	Get the length of data that has been read. More...

Private Member Functions
int	setup_zstream ()
	Do setup of the zlib stream. More...
bool	assert_empty_local_prefix ()
	Assert that the local prefix is empty. More...

Private Attributes
ReadContext	m_rctx
ulint	m_remaining
	Bytes yet to be read. More...
z_stream	m_stream
	The zlib stream used to uncompress while fetching blob. More...
mem_heap_t *	m_heap
	The memory heap that will be used by zlib allocator. More...
buf_page_t *	m_bpage
ulint	m_page_type_ex
	The expected page type. More...

Detailed Description

Fetch compressed BLOB.

Constructor & Destructor Documentation

zReader()

lob::zReader::zReader ( const ReadContext &  ctx )

inlineexplicit

Constructor.

Member Function Documentation

assert_empty_local_prefix()

bool lob::zReader::assert_empty_local_prefix ( )

private

Assert that the local prefix is empty.

For compressed row format, there is no local prefix stored. This function doesn't return if the local prefix is non-empty.

Returns

true if local prefix is empty

fetch()

dberr_t lob::zReader::fetch

(

)

Fetch the BLOB.

Returns

DB_SUCCESS on success.

DB_SUCCESS on success, DB_FAIL on error.

fetch_page()

dberr_t lob::zReader::fetch_page

(

)

Fetch one BLOB page.

Returns

DB_SUCCESS on success.

length()

ulint lob::zReader::length ( ) const

inline

Get the length of data that has been read.

Returns

the length of data that has been read.

setup_zstream()

int lob::zReader::setup_zstream ( )

private

Do setup of the zlib stream.

Returns

code returned by zlib.

Member Data Documentation

m_bpage

buf_page_t* lob::zReader::m_bpage

private

m_heap

mem_heap_t* lob::zReader::m_heap

private

The memory heap that will be used by zlib allocator.

m_page_type_ex

ulint lob::zReader::m_page_type_ex

private

The expected page type.

m_rctx

ReadContext lob::zReader::m_rctx

private

m_remaining

ulint lob::zReader::m_remaining

private

Bytes yet to be read.

m_stream

z_stream lob::zReader::m_stream

private

The zlib stream used to uncompress while fetching blob.

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

• storage/innobase/include/lob0lob.h
• storage/innobase/lob/lob0lob.cc