MediaWiki 1.7.1 wiederhergestellt

1 files changed, 308 insertions, 0 deletions

diff --git a/includes/HistoryBlob.php b/includes/HistoryBlob.php
new file mode 100644
index 00000000..8f5d3624
--- /dev/null
+++ b/includes/HistoryBlob.php
@@ -0,0 +1,308 @@
+<?php
+/**
+ *
+ * @package MediaWiki
+ */
+
+/**
+ * Pure virtual parent
+ * @package MediaWiki
+ */
+class HistoryBlob
+{
+	/**
+	 * setMeta and getMeta currently aren't used for anything, I just thought
+	 * they might be useful in the future.
+	 * @param $meta String: a single string.
+	 */
+	function setMeta( $meta ) {}
+
+	/**
+	 * setMeta and getMeta currently aren't used for anything, I just thought
+	 * they might be useful in the future.
+	 * Gets the meta-value
+	 */
+	function getMeta() {}
+
+	/**
+	 * Adds an item of text, returns a stub object which points to the item.
+	 * You must call setLocation() on the stub object before storing it to the
+	 * database
+	 */
+	function addItem() {}
+
+	/**
+	 * Get item by hash
+	 */
+	function getItem( $hash ) {}
+
+	# Set the "default text"
+	# This concept is an odd property of the current DB schema, whereby each text item has a revision
+	# associated with it. The default text is the text of the associated revision. There may, however,
+	# be other revisions in the same object
+	function setText() {}
+
+	/**
+	 * Get default text. This is called from Revision::getRevisionText()
+	 */
+	function getText() {}
+}
+
+/**
+ * The real object
+ * @package MediaWiki
+ */
+class ConcatenatedGzipHistoryBlob extends HistoryBlob
+{
+	/* private */ var $mVersion = 0, $mCompressed = false, $mItems = array(), $mDefaultHash = '';
+	/* private */ var $mFast = 0, $mSize = 0;
+
+	function ConcatenatedGzipHistoryBlob() {
+		if ( !function_exists( 'gzdeflate' ) ) {
+			throw new MWException( "Need zlib support to read or write this kind of history object (ConcatenatedGzipHistoryBlob)\n" );
+		}
+	}
+
+	/** @todo document */
+	function setMeta( $metaData ) {
+		$this->uncompress();
+		$this->mItems['meta'] = $metaData;
+	}
+
+	/** @todo document */
+	function getMeta() {
+		$this->uncompress();
+		return $this->mItems['meta'];
+	}
+
+	/** @todo document */
+	function addItem( $text ) {
+		$this->uncompress();
+		$hash = md5( $text );
+		$this->mItems[$hash] = $text;
+		$this->mSize += strlen( $text );
+
+		$stub = new HistoryBlobStub( $hash );
+		return $stub;
+	}
+
+	/** @todo document */
+	function getItem( $hash ) {
+		$this->uncompress();
+		if ( array_key_exists( $hash, $this->mItems ) ) {
+			return $this->mItems[$hash];
+		} else {
+			return false;
+		}
+	}
+
+	/** @todo document */
+	function removeItem( $hash ) {
+		$this->mSize -= strlen( $this->mItems[$hash] );
+		unset( $this->mItems[$hash] );
+	}
+
+	/** @todo document */
+	function compress() {
+		if ( !$this->mCompressed  ) {
+			$this->mItems = gzdeflate( serialize( $this->mItems ) );
+			$this->mCompressed = true;
+		}
+	}
+
+	/** @todo document */
+	function uncompress() {
+		if ( $this->mCompressed ) {
+			$this->mItems = unserialize( gzinflate( $this->mItems ) );
+			$this->mCompressed = false;
+		}
+	}
+
+	/** @todo document */
+	function getText() {
+		$this->uncompress();
+		return $this->getItem( $this->mDefaultHash );
+	}
+
+	/** @todo document */
+	function setText( $text ) {
+		$this->uncompress();
+		$stub = $this->addItem( $text );
+		$this->mDefaultHash = $stub->mHash;
+	}
+
+	/** @todo document */
+	function __sleep() {
+		$this->compress();
+		return array( 'mVersion', 'mCompressed', 'mItems', 'mDefaultHash' );
+	}
+
+	/** @todo document */
+	function __wakeup() {
+		$this->uncompress();
+	}
+
+	/**
+	 * Determines if this object is happy
+	 */
+	function isHappy( $maxFactor, $factorThreshold ) {
+		if ( count( $this->mItems ) == 0 ) {
+			return true;
+		}
+		if ( !$this->mFast ) {
+			$this->uncompress();
+			$record = serialize( $this->mItems );
+			$size = strlen( $record );
+			$avgUncompressed = $size / count( $this->mItems );
+			$compressed = strlen( gzdeflate( $record ) );
+
+			if ( $compressed < $factorThreshold * 1024 ) {
+				return true;
+			} else {
+				return $avgUncompressed * $maxFactor < $compressed;
+			}
+		} else {
+			return count( $this->mItems ) <= 10;
+		}
+	}
+}
+
+
+/**
+ * One-step cache variable to hold base blobs; operations that
+ * pull multiple revisions may often pull multiple times from
+ * the same blob. By keeping the last-used one open, we avoid
+ * redundant unserialization and decompression overhead.
+ */
+global $wgBlobCache;
+$wgBlobCache = array();
+
+
+/**
+ * @package MediaWiki
+ */
+class HistoryBlobStub {
+	var $mOldId, $mHash, $mRef;
+
+	/** @todo document */
+	function HistoryBlobStub( $hash = '', $oldid = 0 ) {
+		$this->mHash = $hash;
+	}
+
+	/**
+	 * Sets the location (old_id) of the main object to which this object
+	 * points
+	 */
+	function setLocation( $id ) {
+		$this->mOldId = $id;
+	}
+
+      /**
+       * Sets the location (old_id) of the referring object
+       */
+	function setReferrer( $id ) {
+		$this->mRef = $id;
+	}
+
+      /**
+       * Gets the location of the referring object
+       */
+	function getReferrer() {
+		return $this->mRef;
+	}
+
+	/** @todo document */
+	function getText() {
+		$fname = 'HistoryBlob::getText';
+		global $wgBlobCache;
+		if( isset( $wgBlobCache[$this->mOldId] ) ) {
+			$obj = $wgBlobCache[$this->mOldId];
+		} else {
+			$dbr =& wfGetDB( DB_SLAVE );
+			$row = $dbr->selectRow( 'text', array( 'old_flags', 'old_text' ), array( 'old_id' => $this->mOldId ) );
+			if( !$row ) {
+				return false;
+			}
+			$flags = explode( ',', $row->old_flags );
+			if( in_array( 'external', $flags ) ) {
+				$url=$row->old_text;
+				@list($proto,$path)=explode('://',$url,2);
+				if ($path=="") {
+					wfProfileOut( $fname );
+					return false;
+				}
+				require_once('ExternalStore.php');
+				$row->old_text=ExternalStore::fetchFromUrl($url);
+
+			}
+			if( !in_array( 'object', $flags ) ) {
+				return false;
+			}
+
+			if( in_array( 'gzip', $flags ) ) {
+				// This shouldn't happen, but a bug in the compress script
+				// may at times gzip-compress a HistoryBlob object row.
+				$obj = unserialize( gzinflate( $row->old_text ) );
+			} else {
+				$obj = unserialize( $row->old_text );
+			}
+
+			if( !is_object( $obj ) ) {
+				// Correct for old double-serialization bug.
+				$obj = unserialize( $obj );
+			}
+
+			// Save this item for reference; if pulling many
+			// items in a row we'll likely use it again.
+			$obj->uncompress();
+			$wgBlobCache = array( $this->mOldId => $obj );
+		}
+		return $obj->getItem( $this->mHash );
+	}
+
+	/** @todo document */
+	function getHash() {
+		return $this->mHash;
+	}
+}
+
+
+/**
+ * To speed up conversion from 1.4 to 1.5 schema, text rows can refer to the
+ * leftover cur table as the backend. This avoids expensively copying hundreds
+ * of megabytes of data during the conversion downtime.
+ *
+ * Serialized HistoryBlobCurStub objects will be inserted into the text table
+ * on conversion if $wgFastSchemaUpgrades is set to true.
+ *
+ * @package MediaWiki
+ */
+class HistoryBlobCurStub {
+	var $mCurId;
+
+	/** @todo document */
+	function HistoryBlobCurStub( $curid = 0 ) {
+		$this->mCurId = $curid;
+	}
+
+	/**
+	 * Sets the location (cur_id) of the main object to which this object
+	 * points
+	 */
+	function setLocation( $id ) {
+		$this->mCurId = $id;
+	}
+
+	/** @todo document */
+	function getText() {
+		$dbr =& wfGetDB( DB_SLAVE );
+		$row = $dbr->selectRow( 'cur', array( 'cur_text' ), array( 'cur_id' => $this->mCurId ) );
+		if( !$row ) {
+			return false;
+		}
+		return $row->cur_text;
+	}
+}
+
+
+?>