support empty-payload REAL values decoding

3 files changed, 11 insertions, 1 deletions

diff --git a/CHANGES b/CHANGES
index 8276f70..1d99d0c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,8 @@
+Revision 0.1.5
+--------------
+
+- Fix to decoder to support empty-payload REAL values
+
 Revision 0.1.4
 --------------
 
diff --git a/pyasn1/codec/ber/decoder.py b/pyasn1/codec/ber/decoder.py
index f63ae8c..d721a4f 100644
--- a/pyasn1/codec/ber/decoder.py
+++ b/pyasn1/codec/ber/decoder.py
@@ -240,7 +240,7 @@ class RealDecoder(AbstractSimpleDecoder):
                      length, state, decodeFun, substrateFun):
         head, tail = substrate[:length], substrate[length:]
         if not head:
-            raise error.SubstrateUnderrunError('Short substrate for Real')
+            return self._createComponent(asn1Spec, tagSet, 0.0), tail
         fo = oct2int(head[0]); head = head[1:]
         if fo & 0x40:  # infinite value
             value = fo & 0x01 and '-inf' or 'inf'
diff --git a/test/codec/ber/decoder.py b/test/codec/ber/decoder.py
index 04d6526..f56bb83 100644
--- a/test/codec/ber/decoder.py
+++ b/test/codec/ber/decoder.py
@@ -214,6 +214,11 @@ class RealDecoderTestCase(unittest.TestCase):
         assert decoder.decode(
             ints2octs((9, 1, 65))
         ) == (univ.Real('-inf'), null)
+
+    def testEmpty(self):
+        assert decoder.decode(
+            ints2octs((9, 0))
+        ) == (univ.Real(0.0), null)
  
 class SequenceDecoderTestCase(unittest.TestCase):
     def setUp(self):