Index: includes/MimeMagic.php
===================================================================
--- includes/MimeMagic.php	(revision 44559)
+++ includes/MimeMagic.php	(working copy)
@@ -38,7 +38,7 @@
 image/gif gif
 image/jpeg jpeg jpg jpe
 image/png png
-image/svg+xml image/svg svg
+image/svg+xml image/svg svg svgz
 image/tiff tiff tif
 image/vnd.djvu image/x.djvu image/x-djvu djvu
 image/x-portable-pixmap ppm
@@ -399,7 +399,7 @@
 			'djvu', 'ogg', 'ogv', 'mid', 'pdf', 'wmf', 'xcf',
 
 			// XML formats we sure hope we recognize reliably
-			'svg',
+			'svg', 'svgz',
 		);
 		return in_array( strtolower( $extension ), $types );
 	}
Index: includes/mime.types
===================================================================
--- includes/mime.types	(revision 44559)
+++ includes/mime.types	(working copy)
@@ -78,7 +78,7 @@
 image/ief ief
 image/jpeg jpeg jpg jpe
 image/png png
-image/svg+xml svg
+image/svg+xml svg svgz
 image/tiff tiff tif
 image/vnd.djvu djvu djv
 image/vnd.wap.wbmp wbmp
Index: includes/XmlTypeCheck.php
===================================================================
--- includes/XmlTypeCheck.php	(revision 44559)
+++ includes/XmlTypeCheck.php	(working copy)
@@ -48,20 +48,46 @@
 		xml_set_element_handler( $parser, array( $this, 'rootElementOpen' ), false );
 
 		$file = fopen( $fname, "rb" );
-		do {
-			$chunk = fread( $file, 32768 );
-			$ret = xml_parse( $parser, $chunk, feof( $file ) );
-			if( $ret == 0 ) {
-				// XML isn't well-formed!
-				fclose( $file );
-				xml_parser_free( $parser );
-				return;
-			}
-		} while( !feof( $file ) );
+		$chunk = fread( $file, 16 );
+		fclose( $file );
 
+		//GZip magic signature (for .SVGZ, etc.)  Repoen using ZLib.
+		$use_gzip = ( substr( $chunk, 0, 2 ) == "\x1f\x8b" && function_exists( 'gzopen' ) ); 
+
+		if ( $use_gzip ) {
+
+			$file = gzopen( $fname, "rb" );
+			do {
+				$chunk = gzread( $file, 32768 );
+				$ret = xml_parse( $parser, $chunk, gzeof( $file ) );
+				if( $ret == 0 ) {
+					// XML isn't well-formed!
+					gzclose( $file );
+					xml_parser_free( $parser );
+					return;
+				}
+			} while( !gzeof( $file ) );
+			gzclose( $file );
+
+		} else { //Plain Text
+
+			$file = fopen( $fname, "rb" );
+			do {
+				$chunk = fread( $file, 32768 );
+				$ret = xml_parse( $parser, $chunk, feof( $file ) );
+				if( $ret == 0 ) {
+					// XML isn't well-formed!
+					fclose( $file );
+					xml_parser_free( $parser );
+					return;
+				}
+			} while( !feof( $file ) );
+			fclose( $file );
+
+		}
+
 		$this->wellFormed = true;
 
-		fclose( $file );
 		xml_parser_free( $parser );
 	}
 
Index: includes/ImageFunctions.php
===================================================================
--- includes/ImageFunctions.php	(revision 44559)
+++ includes/ImageFunctions.php	(working copy)
@@ -47,7 +47,6 @@
 
 /**
  * Compatible with PHP getimagesize()
- * @todo support gzipped SVGZ
  * @todo check XML more carefully
  * @todo sensible defaults
  *