Read data blockwise not everything at once

2 files changed, 20 insertions, 4 deletions

diff --git a/lib/Analyzer/EntropyAnalyzer.php b/lib/Analyzer/EntropyAnalyzer.php
index ad913cd..d3c7fdb 100644
--- a/lib/Analyzer/EntropyAnalyzer.php
+++ b/lib/Analyzer/EntropyAnalyzer.php
@@ -169,13 +169,25 @@ class EntropyAnalyzer
      */
     protected function calculateEntropyOfFile($node)
     {
-        $data = $node->getContent();
-        if (!$data) {
+        $handle = $node->fopen('r');
+        if (!$handle) {
             $this->logger->debug('calculateEntropyOfFile: Getting data failed.', array('app' => Application::APP_ID));
 
             return 0.0;
         }
 
-        return $this->entropy->calculateEntropy($data);
+        while (!feof($handle)) {
+            $data = fread($handle, 1024);
+            if (strlen($data) === 1024) {
+                $entropy = $entropy + $this->entropy->calculateEntropy($block);
+            }
+        }
+        fclose($handle);
+
+        if ($entropy >= 0) {
+            return $entopry;
+        } else {
+            return -$entropy;
+        }
     }
 }
diff --git a/lib/Analyzer/FileCorruptionAnalyzer.php b/lib/Analyzer/FileCorruptionAnalyzer.php
index d5bf092..3f2b3f4 100644
--- a/lib/Analyzer/FileCorruptionAnalyzer.php
+++ b/lib/Analyzer/FileCorruptionAnalyzer.php
@@ -77,7 +77,11 @@ class FileCorruptionAnalyzer
         $signatures = FileSignatures::getSignatures();
 
         try {
-            $data = $node->getContent();
+            // get the first 1024 bytes
+            $handle = $node->fopen('r');
+            $data = fread($handle, 1024);
+            fclose($handle);
+
             $pathInfo = pathinfo($node->getPath());
             foreach ($signatures as $signature) {
                 $isFileCorrupted = true;