fix: Update c2pa.py code

Author: tmathern

src/c2pa/c2pa.py

@@ -336,19 +336,6 @@ def _setup_function(func, argtypes, restype=None):
     None
 )
 
-# Add dummy context functions
-_setup_function(
-    _lib.c2pa_create_dummy_context,
-    [],
-    ctypes.POINTER(StreamContext)
-)
-
-_setup_function(
-    _lib.c2pa_free_dummy_context,
-    [ctypes.POINTER(StreamContext)],
-    None
-)
-
 # Set up function prototypes not attached to an API object
 _setup_function(_lib.c2pa_version, [], ctypes.c_void_p)
 _setup_function(_lib.c2pa_error, [], ctypes.c_void_p)
@@ -1137,11 +1124,12 @@ def flush_callback(ctx):
         self._flush_cb = FlushCallback(flush_callback)
 
         # Create a dummy context since Python callbacks don't use it
-        self._dummy_context = _lib.c2pa_create_dummy_context()
+        # We create a small buffer and cast it to a StreamContext pointer
+        self._dummy_context = ctypes.create_string_buffer(1)  # Create a 1-byte buffer
 
         # Create the stream
         self._stream = _lib.c2pa_create_stream(
-            self._dummy_context,  # context
+            ctypes.cast(self._dummy_context, ctypes.POINTER(StreamContext)),  # context
             self._read_cb,
             self._seek_cb,
             self._write_cb,
@@ -1186,15 +1174,6 @@ def __del__(self):
                         self._stream = None
                         self._closed = True
                         self._initialized = False
-                        
-                        # Clean up dummy context
-                        if hasattr(self, '_dummy_context') and self._dummy_context:
-                            try:
-                                _lib.c2pa_free_dummy_context(self._dummy_context)
-                            except Exception:
-                                pass
-                            finally:
-                                self._dummy_context = None
         except Exception:
             # Destructors must not raise exceptions
             pass
@@ -1225,16 +1204,6 @@ def close(self):
                 finally:
                     self._stream = None
 
-            # Clean up dummy context
-            if hasattr(self, '_dummy_context') and self._dummy_context:
-                try:
-                    _lib.c2pa_free_dummy_context(self._dummy_context)
-                except Exception as e:
-                    logger.error(
-                        Stream._ERROR_MESSAGES['callback_error'].format(
-                            'dummy_context', str(e)))
-                finally:
-                    self._dummy_context = None
 
             # Clean up callbacks
             for attr in ['_read_cb', '_seek_cb', '_write_cb', '_flush_cb']: