Serialization for unsigned integers

[sandbox] / serial / binary.py

diff --git a/serial/binary.py b/serial/binary.py
index 2b18bfb..f6bcff7 100644 (file)
--- a/serial/binary.py
+++ b/serial/binary.py
@@ -1,8 +1,15 @@
 import collections
+import functools
+import io
+import struct
 
 TAG_NULL = 0x00
 TAG_TRUE = 0x01
 TAG_FALSE = 0x02
+TAG_UINT8 = 0x03
+TAG_UINT16 = 0x04
+TAG_UINT32 = 0x05
+TAG_UINT64 = 0x06
 
 TaggedObject = collections.namedtuple(
     'TaggedObject',
@@ -21,10 +28,23 @@ def _make_tag_only_serializer(tag, expected_value):
 
     return serializer
 
+def _make_struct_serializer(fmt):
+    fmt = '!B' + fmt
+    packer = functools.partial(struct.pack, fmt)
+
+    def serializer(to):
+        return packer(to.tag, to.instance)
+
+    return serializer
+
 _TAGS_TO_SERIALIZERS = {
     TAG_NULL: _make_tag_only_serializer(TAG_NULL, None),
     TAG_TRUE: _make_tag_only_serializer(TAG_TRUE, True),
     TAG_FALSE: _make_tag_only_serializer(TAG_FALSE, False),
+    TAG_UINT8: _make_struct_serializer('B'),
+    TAG_UINT16: _make_struct_serializer('H'),
+    TAG_UINT32: _make_struct_serializer('I'),
+    TAG_UINT64: _make_struct_serializer('Q'),
 }
 
 def serialize(to):
@@ -32,7 +52,7 @@ def serialize(to):
 
 def _make_tag_only_parser(tag, value):
     def parser(b):
-        return TaggedObject(tag = tag, instance = value), b
+        return TaggedObject(tag = tag, instance = value)
 
     return parser
 
@@ -43,7 +63,14 @@ _TAGS_TO_PARSERS = {
 }
 
 def deserialize(b):
-    result, remainder = _TAGS_TO_PARSERS[b[0]](b[1:])
+    if isinstance(b, bytes):
+        b = io.BytesIO(b)
+
+    tag = b.read(1)[0]
+
+    result = _TAGS_TO_PARSERS[tag](b)
+
+    remainder = b.read()
 
     if len(remainder) == 0:
         return result