Index: offline.wikipedia/mediawiki_sa/includes/Math.php
===================================================================
--- offline.wikipedia/mediawiki_sa/includes/Math.php	(revision 102)
+++ offline.wikipedia/mediawiki_sa/includes/Math.php	(working copy)
@@ -24,6 +24,7 @@
 
 	function MathRenderer( $tex ) {
 		$this->tex = $tex;
+		$this->cachehash = md5( $this->tex );
  	}
 
 	function setOutputMode( $mode ) {
@@ -41,6 +42,15 @@
 		}
 
 		if( !$this->_recall() ) {
+			// ----------------------
+			// jsomers - 8/24/09 - read from "cache"
+			$cachepath = $this->_getCachePath();
+			if (is_dir($cachepath)) { // We've processed this input before
+				$this->hash = trim(`ls $cachepath`);
+				return $this->_doRender(); // images should be there already.
+			}
+			// ----------------------
+			
 			# Ensure that the temp and output directories are available before continuing...
 			if( !file_exists( $wgTmpDirectory ) ) {
 				if( !@mkdir( $wgTmpDirectory ) ) {
@@ -144,7 +154,14 @@
 			if( !rename( "$wgTmpDirectory/{$this->hash}.png", "$hashpath/{$this->hash}.png" ) ) {
 				return $this->_error( 'math_output_error' );
 			}
-
+			
+			// ----------------------
+			// jsomers - 8/24/09 - create a mapping between the input and output hashes:
+			if ( !is_dir( $cachepath ) ) {
+				mkdir($cachepath."/".$this->hash, 0777, true);
+			}
+			// ----------------------
+			
 			// fnatter 2006-11-05: don't use db for standalone mediawiki
 			# Now save it back to the DB:
 			if ( !wfReadOnly() and false) { // fnatter: NOTE "and false"!
@@ -249,13 +266,13 @@
 	function _linkToMathImage() {
 		global $wgMathPath;
 		global $wgMathDirectory;
-		
+
 		// michael nowak - 05.03.2007 - replaced: "$wgMathPath/" with: "pics://math/"
-		$url = htmlspecialchars( "pics://math/" . substr($this->hash, 0, 1)
+		$url = htmlspecialchars( "/images/" . substr($this->hash, 0, 1)
 					.'/'. substr($this->hash, 1, 1) .'/'. substr($this->hash, 2, 1)
 					. "/{$this->hash}.png" );
 		$alt = trim(str_replace("\n", ' ', htmlspecialchars( $this->tex )));
-		return "<img class='tex' src=\"$url\" alt=\"$alt\" />";
+		return "<img class=\"tex\" src=\"$url\" alt=\"$alt\"/>";
 	}
 
 	function _getHashPath() {
@@ -266,6 +283,14 @@
 		wfDebug( "TeX: getHashPath, hash is: $this->hash, path is: $path\n" );
 		return $path;
 	}
+	
+	function _getCachePath() {
+		$path = '/users/jsomers/offline.wikipedia/mediawiki_sa/images/math/_cached/'. substr($this->cachehash, 0, 1)
+					.'/'. substr($this->cachehash, 1, 1)
+					.'/'. substr($this->cachehash, 2, 1)
+					.'/'. $this->cachehash;
+		return $path;
+	}
 
 	function renderMath( $tex ) {
 		global $wgUser;