[bugfix] concatenate zero-length buffer

quentinlampin · Jan 14, 2025 · 3018fc1 · 3018fc1
1 parent 7981e3e
commit 3018fc1
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diff --git a/microschc/binary/buffer.py b/microschc/binary/buffer.py
@@ -273,6 +273,10 @@ def __add__(self, other: 'Buffer') -> 'Buffer':
         left:Buffer = self
         right:Buffer = other
 
+        if right.length == 0:
+            new_buffer: Buffer = left.copy()
+            return new_buffer
+
         # Calculate new length
         new_length: int = left.length + right.length
 

diff --git a/tests/binary/test_buffer.py b/tests/binary/test_buffer.py
@@ -325,6 +325,11 @@ def test_add():
     left_right: Buffer = left + right
     expected: Buffer = Buffer(content=b'\x00\x8a\xf9\x10', length=29, padding=Padding.RIGHT)
     assert left_right == expected
+
+    left: Buffer = Buffer(content=b'\x00\x8a\xf8', length=23, padding=Padding.RIGHT)
+    right: Buffer = Buffer(content=b'', length=0)
+    left_right: Buffer = left + right
+    assert left_right == left
 
 def test_or():
     #              0x08          0x68