upgrade to 14.4.1upstream/14.4.1

1 files changed, 33 insertions, 0 deletions

diff --git a/zmq/utils/interop.py b/zmq/utils/interop.py
new file mode 100644
index 0000000..26c0196
--- /dev/null
+++ b/zmq/utils/interop.py
@@ -0,0 +1,33 @@
+"""Utils for interoperability with other libraries.
+
+Just CFFI pointer casting for now.
+"""
+
+# Copyright (C) PyZMQ Developers
+# Distributed under the terms of the Modified BSD License.
+
+
+try:
+    long
+except NameError:
+    long = int # Python 3
+
+
+def cast_int_addr(n):
+    """Cast an address to a Python int
+    
+    This could be a Python integer or a CFFI pointer
+    """
+    if isinstance(n, (int, long)):
+        return n
+    try:
+        import cffi
+    except ImportError:
+        pass
+    else:
+        # from pyzmq, this is an FFI void *
+        ffi = cffi.FFI()
+        if isinstance(n, ffi.CData):
+            return int(ffi.cast("size_t", n))
+    
+    raise ValueError("Cannot cast %r to int" % n)