Do not convert files above 200k, link to unchanged files

1 files changed, 24 insertions, 9 deletions

diff --git a/it_auto_prepend.php b/it_auto_prepend.php
index c71e38c..0867357 100644
--- a/it_auto_prepend.php
+++ b/it_auto_prepend.php
@@ -133,19 +133,34 @@ function it_convert($source)
 	else if (@is_readable($source))
 	{
 		$converted = $GLOBALS['IT_SYNTAXCONVERTER_DIR'] . "/it_syntaxconverter/$sourcerelpath";
+		$stat = @lstat($converted);
+		$mtimeconverted = $stat[9];
 
-		if (@filemtime($converted) < filemtime($source))
+		if ($mtimeconverted < filemtime($source))
 		{
-			$converter = new it_syntaxconverter(file_get_contents($source));
-			$parts = explode("/", dirname($converted));
-
-			for ($i = 1; $i <= count($parts); $i++)
-				@mkdir(join("/", array_slice($parts, 0, $i)), 0700);
+			if ($changed = filesize($source) < 200000)	# Do not attempt to convert anything above 200k to avoid large memory consumption
+			{
+				$converter = new it_syntaxconverter(file_get_contents($source));
+				$parts = explode("/", dirname($converted));
+
+				for ($i = 1; $i <= count($parts); $i++)
+					@mkdir(join("/", array_slice($parts, 0, $i)), 0700);
+
+				if ($changed = $converter->changes)
+				{
+					@unlink($converted);
+					if ($output = fopen($converted, "w"))
+					{
+						fputs($output, $converter->output);
+						fclose($output);
+					}
+				}
+			}
 
-			if ($output = fopen($converted, "w"))
+			if (!$changed)	# Link to original file if no changes made
 			{
-				fputs($output, $converter->output);
-				fclose($output);
+				@unlink($converted);
+				symlink(realpath($source), $converted);
 			}
 
 			clearstatcache();