for deserialisation, correct offset for bits (#187)

* for deserialisation, correct offset for bits

it needs to be increased only at the beginning and once every 8 bits

* Added a test.

* Autopep8.

* Verify result.

2 files changed, 9 insertions, 1 deletions

diff --git a/amqp/serialization.py b/amqp/serialization.py
index 95c18ea..183ae2e 100644
--- a/amqp/serialization.py
+++ b/amqp/serialization.py
@@ -171,11 +171,12 @@ def loads(format, buf, offset=0,
         if p == 'b':
             if not bitcount:
                 bits = ord(buf[offset:offset + 1])
+                offset += 1
             bitcount = 8
             val = (bits & 1) == 1
             bits >>= 1
             bitcount -= 1
-            offset += 1
+
         elif p == 'o':
             bitcount = bits = 0
             val, = unpack_from('>B', buf, offset)
diff --git a/t/unit/test_serialization.py b/t/unit/test_serialization.py
index 811b1a6..3891090 100644
--- a/t/unit/test_serialization.py
+++ b/t/unit/test_serialization.py
@@ -98,6 +98,13 @@ class test_serialization:
         with pytest.raises(FrameSyntaxError):
             dumps('A', [[object()]])
 
+    def test_bit_offset_adjusted_correctly(self):
+        expected = [50, "quick", "fox", True,
+                    False, False, True, True, {"prop1": True}]
+        buf = dumps('BssbbbbbF', expected)
+        actual, _ = loads('BssbbbbbF', buf)
+        assert actual == expected
+
 
 class test_GenericContent: