1 files changed, 64 insertions, 0 deletions
diff --git a/includes/HistoryBlob.php b/includes/HistoryBlob.php
new file mode 100644
index 000000000000..cf170b759531
--- /dev/null
+++ b/includes/HistoryBlob.php
@@ -0,0 +1,64 @@
+<?php
+
+# Pure virtual parent
+class HistoryBlob
+{
+	function setMeta() {}
+	function getMeta() {}
+	function addItem() {}
+	function getItem() {}
+}
+
+# The real object
+class ConcatenatedGzipHistoryBlob
+{
+	/* private */ var $mVersion = 0, $mCompressed = false, $mItems = array();
+
+	function HistoryBlob() {
+		if ( !function_exists( 'gzdeflate' ) ) {
+			die( "Need zlib support to read or write this kind of history object (ConcatenatedGzipHistoryBlob)\n" );
+		}
+	}
+	
+	function setMeta( $metaData ) {
+		$this->uncompress();
+		$this->mItems['meta'] = $metaData;
+	}
+
+	function getMeta() {
+		$this->uncompress();
+		return $this->mItems['meta'];
+	}
+	
+	function addItem( $text ) {
+		$this->uncompress();
+		$this->mItems[md5($text)] = $text;
+	}
+
+	function getItem( $hash ) {
+		$this->compress();
+		return $this->mItems[$hash];
+	}
+
+	function compress() {
+		if ( !$this->mCompressed  ) {
+			$this->mItems = gzdeflate( serialize( $this->mItems ) );
+			$this->mCompressed = true;
+		}
+	}
+
+	function uncompress() { 
+		if ( $this->mCompressed ) {
+			$this->mItems = unserialize( gzinflate( $this->mItems ) );
+		}
+	}
+
+	function __sleep() {
+		compress();
+	}
+
+	function __wakeup() {
+		uncompress();
+	}
+}
+?>