Fix compiler warnings

Author: elprans

asyncpg/pgproto

@@ -146,6 +146,8 @@ cdef multirange_encode(ConnectionSettings settings, WriteBuffer buf,
                        encode_func_ex encoder, const void *encoder_arg):
     cdef:
         WriteBuffer elem_data
+        ssize_t elem_data_len
+        ssize_t elem_count
 
     if not isinstance(obj, SequenceABC):
         raise TypeError(
@@ -157,10 +159,20 @@ cdef multirange_encode(ConnectionSettings settings, WriteBuffer buf,
     for elem in obj:
         range_encode(settings, elem_data, elem, elem_oid, encoder, encoder_arg)
 
+    elem_count = len(obj)
+    if elem_count > INT32_MAX:
+        raise OverflowError(f'too many elements in multirange value')
+
+    elem_data_len = elem_data.len()
+    if elem_data_len > INT32_MAX - 4:
+        raise OverflowError(
+            f'size of encoded multirange datum exceeds the maximum allowed'
+            f' {INT32_MAX - 4} bytes')
+
     # Datum length
-    buf.write_int32(4 + elem_data.len())
+    buf.write_int32(4 + <int32_t>elem_data_len)
     # Number of elements in multirange
-    buf.write_int32(len(obj))
+    buf.write_int32(<int32_t>elem_count)
     buf.write_buffer(elem_data)
 
 

asyncpg/protocol/codecs/range.pyx

@@ -151,7 +151,7 @@ cdef class PreparedStatementState:
             writer.write_int16(self.args_num)
             for idx in range(self.args_num):
                 codec = <Codec>(self.args_codecs[idx])
-                writer.write_int16(codec.format)
+                writer.write_int16(<int16_t>codec.format)
         else:
             # All arguments are in binary format
             writer.write_int32(0x00010001)
@@ -203,7 +203,7 @@ cdef class PreparedStatementState:
             writer.write_int16(self.cols_num)
             for idx in range(self.cols_num):
                 codec = <Codec>(self.rows_codecs[idx])
-                writer.write_int16(codec.format)
+                writer.write_int16(<int16_t>codec.format)
         else:
             # All columns are in binary format
             writer.write_int32(0x00010001)

asyncpg/protocol/prepared_stmt.pyx

@@ -38,7 +38,7 @@ from asyncpg.protocol cimport record
 
 from libc.stdint cimport int8_t, uint8_t, int16_t, uint16_t, \
                          int32_t, uint32_t, int64_t, uint64_t, \
-                         UINT32_MAX
+                         INT32_MAX, UINT32_MAX
 
 from asyncpg.exceptions import _base as apg_exc_base
 from asyncpg import compat

asyncpg/protocol/protocol.pyx

@@ -63,7 +63,7 @@ ApgRecord_New(PyTypeObject *type, PyObject *desc, Py_ssize_t size)
             return PyErr_NoMemory();
         }
         o = (ApgRecordObject *)type->tp_alloc(type, size);
-        if (!_ApgObject_GC_IS_TRACKED(o)) {
+        if (!_ApgObject_GC_IS_TRACKED((PyObject *)o)) {
             PyErr_SetString(
                 PyExc_TypeError,
                 "record subclass is not tracked by GC"