PYTHON-5214 - Improve BSON decoding InvalidBSON error message (#2605)

2025-10-29 14:30:18 -04:00 · 2025-10-29 14:30:18 -04:00 · b607ef144c
commit b607ef144c
parent fd02550349
1 changed files with 3 additions and 1 deletions
--- a/bson/init.py
+++ b/bson/init.py
@ -1109,7 +1109,9 @@ def _decode_all(data: _ReadableBuffer, opts: CodecOptions[_DocumentType]) -> lis
        while position < end:
            obj_size = _UNPACK_INT_FROM(data, position)[0]
            if data_len - position < obj_size:
-                raise InvalidBSON("invalid object size")
+                raise InvalidBSON(
+                    f"invalid object size: expected {obj_size}, got {data_len - position}"
+                )
            obj_end = position + obj_size - 1
            if data[obj_end] != 0:
                raise InvalidBSON("bad eoo")