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Handle big endian bitfields correctly

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This commit is contained in:
Jerry James 2023-09-13 08:31:22 -06:00
parent 3cd5daf025
commit 0c02195510
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GPG key ID: 757AADA178D4C91A
2 changed files with 15 additions and 5 deletions
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15
blueprintcompiler/typelib.py
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@ -61,7 +61,14 @@ class Field:
def __init__(self, offset: int, type: str, shift=0, mask=None):
self._offset = offset
self._type = type
self._shift = shift
if not mask or sys.byteorder == "little":
self._shift = shift
elif self._type == "u8" or self._type == "i8":
self._shift = 7 - shift
elif self._type == "u16" or self._type == "i16":
self._shift = 15 - shift
else:
self._shift = 31 - shift
self._mask = (1 << mask) - 1 if mask else None
self._name = f"{offset}__{type}__{shift}__{mask}"
@ -174,7 +181,7 @@ class Typelib:
OBJ_FINAL = Field(0x02, "u16", 3, 1)
OBJ_GTYPE_NAME = Field(0x08, "string")
OBJ_PARENT = Field(0x10, "dir_entry")
OBJ_GTYPE_STRUCT = Field(0x14, "string")
OBJ_GTYPE_STRUCT = Field(0x12, "string")
OBJ_N_INTERFACES = Field(0x14, "u16")
OBJ_N_FIELDS = Field(0x16, "u16")
OBJ_N_PROPERTIES = Field(0x18, "u16")
@ -259,7 +266,9 @@ class Typelib:
def _int(self, size, signed) -> int:
return int.from_bytes(
self._typelib_file[self._offset : self._offset + size], sys.byteorder
self._typelib_file[self._offset : self._offset + size],
sys.byteorder,
signed=signed,
)