DiffHistoryBlob Class Reference

Diff-based history compression Requires xdiff 1.5+ and zlib. More...

Inheritance diagram for DiffHistoryBlob:

Collaboration diagram for DiffHistoryBlob:

Public Member Functions
	__construct ()
	__sleep ()
	__wakeup ()
	addItem ( $text)
	compress ()
	diff ( $t1, $t2)
	getItem ( $key)
	getText ()
	isHappy ()
	Helper function for compression jobs Returns true until the object is "full" and ready to be committed. More...
	patch ( $base, $diff)
	setText ( $text)
	uncompress ()
	xdiffAdler32 ( $s)
	Compute a binary "Adler-32" checksum as defined by LibXDiff, i.e. More...

Public Attributes
	$mCompressed
	Compressed storage. More...
	$mDefaultKey
	The key for getText() More...
	$mDiffMap
	The diff map, see above. More...
	$mDiffs
	Array of diffs. More...
	$mFrozen = false
	True if the object is locked against further writes. More...
	$mItems = array()
	Uncompressed item cache. More...
	$mMaxCount = 100
	The maximum number of text items before the object becomes sad. More...
	$mMaxSize = 10000000
	The maximum uncompressed size before the object becomes sad Should be less than max_allowed_packet. More...
	$mSize = 0
	Total uncompressed size. More...
const	XDL_BDOP_CPY = 2
const	XDL_BDOP_INS = 1
	Constants from xdiff.h. More...
const	XDL_BDOP_INSB = 3

Detailed Description

Diff-based history compression Requires xdiff 1.5+ and zlib.

Definition at line 334 of file HistoryBlob.php.

Constructor & Destructor Documentation

__construct()

DiffHistoryBlob::__construct

(

)

Definition at line 385 of file HistoryBlob.php.

Member Function Documentation

__sleep()

DiffHistoryBlob::__sleep

(

)

Returns

array

Definition at line 617 of file HistoryBlob.php.

References $mDefaultKey, array(), as, and compress().

__wakeup()

DiffHistoryBlob::__wakeup

(

)

Definition at line 645 of file HistoryBlob.php.

References array(), as, and uncompress().

addItem()

DiffHistoryBlob::addItem

(

$text

)

Exceptions

MWException

Parameters

$text

string

Returns

int

Implements HistoryBlob.

Definition at line 396 of file HistoryBlob.php.

Referenced by setText().

compress()

DiffHistoryBlob::compress

(

)

Exceptions

MWException

Definition at line 432 of file HistoryBlob.php.

References array(), as, diff(), and patch().

Referenced by __sleep().

diff()

DiffHistoryBlob::diff	(		$t1,
			$t2
	)

Parameters

$t1
$t2

Returns

string

Definition at line 509 of file HistoryBlob.php.

References wfRestoreWarnings(), and wfSuppressWarnings().

Referenced by compress().

getItem()

DiffHistoryBlob::getItem

(

$key

)

Parameters

$key

string

Returns

string

Implements HistoryBlob.

Definition at line 411 of file HistoryBlob.php.

Referenced by getText().

getText()

DiffHistoryBlob::getText

(

)

Returns

string

Implements HistoryBlob.

Definition at line 425 of file HistoryBlob.php.

References getItem().

isHappy()

DiffHistoryBlob::isHappy

(

)

Helper function for compression jobs Returns true until the object is "full" and ready to be committed.

Returns

bool

Definition at line 685 of file HistoryBlob.php.

References $mMaxCount.

patch()

DiffHistoryBlob::patch	(		$base,
			$diff
	)

Parameters

$base
$diff

Returns

bool|string

Definition at line 523 of file HistoryBlob.php.

References $out, wfDebug(), wfRestoreWarnings(), wfSuppressWarnings(), xdiffAdler32(), XDL_BDOP_CPY, XDL_BDOP_INS, and XDL_BDOP_INSB.

Referenced by compress(), and uncompress().

setText()

DiffHistoryBlob::setText

(

$text

)

Parameters

$text

string

Implements HistoryBlob.

Definition at line 418 of file HistoryBlob.php.

References addItem().

uncompress()

DiffHistoryBlob::uncompress

(

)

Definition at line 601 of file HistoryBlob.php.

References patch().

Referenced by __wakeup().

xdiffAdler32()

DiffHistoryBlob::xdiffAdler32

(

$s

)

Compute a binary "Adler-32" checksum as defined by LibXDiff, i.e.

with the bytes backwards and initialised with 0 instead of 1. See bug 34428.

Parameters

string

$s

Returns

string|bool: false if the hash extension is not available

Definition at line 585 of file HistoryBlob.php.

References $s.

Referenced by patch(), and DiffHistoryBlobTest\testXdiffAdler32().

Member Data Documentation

$mCompressed

DiffHistoryBlob::$mCompressed

Compressed storage.

Definition at line 362 of file HistoryBlob.php.

$mDefaultKey

DiffHistoryBlob::$mDefaultKey

The key for getText()

Definition at line 357 of file HistoryBlob.php.

Referenced by __sleep().

$mDiffMap

DiffHistoryBlob::$mDiffMap

The diff map, see above.

Definition at line 352 of file HistoryBlob.php.

$mDiffs

DiffHistoryBlob::$mDiffs

Array of diffs.

If a diff D from A to B is notated D = B - A, and Z is an empty string:

         { item[map[i]] - item[map[i-1]]   where i > 0

diff[i] = { { item[map[i]] - Z where i = 0

Definition at line 349 of file HistoryBlob.php.

$mFrozen

DiffHistoryBlob::$mFrozen = false

True if the object is locked against further writes.

Definition at line 367 of file HistoryBlob.php.

$mItems

DiffHistoryBlob::$mItems = array()

Uncompressed item cache.

Definition at line 336 of file HistoryBlob.php.

$mMaxCount

DiffHistoryBlob::$mMaxCount = 100

The maximum number of text items before the object becomes sad.

Definition at line 378 of file HistoryBlob.php.

Referenced by isHappy().

$mMaxSize

DiffHistoryBlob::$mMaxSize = 10000000

The maximum uncompressed size before the object becomes sad Should be less than max_allowed_packet.

Definition at line 373 of file HistoryBlob.php.

$mSize

DiffHistoryBlob::$mSize = 0

Total uncompressed size.

Definition at line 339 of file HistoryBlob.php.

XDL_BDOP_CPY

const DiffHistoryBlob::XDL_BDOP_CPY = 2

Definition at line 382 of file HistoryBlob.php.

Referenced by patch().

XDL_BDOP_INS

const DiffHistoryBlob::XDL_BDOP_INS = 1

Constants from xdiff.h.

Definition at line 381 of file HistoryBlob.php.

Referenced by patch().

XDL_BDOP_INSB

const DiffHistoryBlob::XDL_BDOP_INSB = 3

Definition at line 383 of file HistoryBlob.php.

Referenced by patch().

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

• includes/HistoryBlob.php