reduce diff for 3.14 and later

Author: picnixz

Modules/_lzmamodule.c

@@ -809,14 +809,11 @@ Compressor_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
         return NULL;
     }
 
-    assert(type != NULL);
-    self = PyObject_GC_New(Compressor, type);
+    assert(type != NULL && type->tp_alloc != NULL);
+    self = (Compressor *)type->tp_alloc(type, 0);
     if (self == NULL) {
         return NULL;
     }
-    /* Initialize the remaining fields (untouched by PyObject_GC_New()). */
-    const size_t offset = sizeof(struct { PyObject_HEAD });
-    memset((char *)self + offset, 0, sizeof(*self) - offset);
 
     self->alloc.opaque = NULL;
     self->alloc.alloc = PyLzma_Malloc;
@@ -830,6 +827,7 @@ Compressor_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
         return NULL;
     }
 
+    self->flushed = 0;
     switch (format) {
         case FORMAT_XZ:
             if (check == -1) {
@@ -1245,19 +1243,16 @@ _lzma_LZMADecompressor_impl(PyTypeObject *type, int format,
         return NULL;
     }
 
-    assert(type != NULL);
-    self = PyObject_GC_New(Decompressor, type);
+    assert(type != NULL && type->tp_alloc != NULL);
+    self = (Decompressor *)type->tp_alloc(type, 0);
     if (self == NULL) {
         return NULL;
     }
-    /* Initialize the remaining fields (untouched by PyObject_GC_New()). */
-    const size_t offset = sizeof(struct { PyObject_HEAD });
-    memset((char *)self + offset, 0, sizeof(*self) - offset);
-
     self->alloc.opaque = NULL;
     self->alloc.alloc = PyLzma_Malloc;
     self->alloc.free = PyLzma_Free;
     self->lzs.allocator = &self->alloc;
+    self->lzs.next_in = NULL;
 
     self->lock = PyThread_allocate_lock();
     if (self->lock == NULL) {
@@ -1268,7 +1263,9 @@ _lzma_LZMADecompressor_impl(PyTypeObject *type, int format,
 
     self->check = LZMA_CHECK_UNKNOWN;
     self->needs_input = 1;
-    self->unused_data = PyBytes_FromStringAndSize(NULL, 0);
+    self->input_buffer = NULL;
+    self->input_buffer_size = 0;
+    Py_XSETREF(self->unused_data, PyBytes_FromStringAndSize(NULL, 0));
     if (self->unused_data == NULL) {
         goto error;
     }