fix the issue

tools/validate_memory.py

@@ -0,0 +1,57 @@
+import sys
+import os
+import psutil
+import gc
+import time
+
+sys.path.insert(0, os.path.abspath('gateway'))
+import pdfengine
+
+def get_memory_mb():
+    process = psutil.Process(os.getpid())
+    return process.memory_info().rss / (1024 * 1024)
+
+def validate_memory(iterations=1000):
+    pdf_file = os.path.abspath("corpus/fonts/utf-8.pdf")
+    
+    print("Memory Validation Test")
+    print("-" * 30)
+    
+    gc.collect()
+    start_mem = get_memory_mb()
+    print(f"Initial Memory: {start_mem:.2f} MB")
+    
+    for i in range(iterations):
+        # Repeated PDF open/close, cache operations
+        doc = pdfengine.PdfDocument.load_from_file(pdf_file)
+        fonts = doc.get_fonts(0, -1)
+        
+        page = doc.get_page(0)
+        text = page.extract_text()
+        glyphs = page.extract_text_with_bounds()
+        
+        # Explicitly delete references
+        del glyphs
+        del text
+        del page
+        del fonts
+        del doc
+        
+        if (i + 1) % 200 == 0:
+            gc.collect()
+            curr_mem = get_memory_mb()
+            print(f"Iteration {i + 1}: {curr_mem:.2f} MB (Delta: {curr_mem - start_mem:.2f} MB)")
+            
+    gc.collect()
+    end_mem = get_memory_mb()
+    print(f"Final Memory: {end_mem:.2f} MB")
+    delta = end_mem - start_mem
+    print(f"Total Delta: {delta:.2f} MB")
+    
+    if delta > 5.0:
+        print("WARNING: Possible memory leak detected!")
+    else:
+        print("SUCCESS: Memory usage is stable. No leaks detected.")
+
+if __name__ == "__main__":
+    validate_memory()