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Do not unnecessarily update FLI __offset #9184

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Do not unnecessarily update FLI __offset #9184

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e73b5ff
Do not unnecessarily update __offset
radarhere Sep 3, 2025
a529797
Assert fp is not None
radarhere Sep 5, 2025
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5 changes: 3 additions & 2 deletions src/PIL/FliImagePlugin.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@ class FliImageFile(ImageFile.ImageFile):

def _open(self) -> None:
# HEAD
assert self.fp is not None
s = self.fp.read(128)
if not (_accept(s) and s[20:22] == b"\x00\x00"):
msg = "not an FLI/FLC file"
Expand Down Expand Up @@ -77,8 +78,7 @@ def _open(self) -> None:

if i16(s, 4) == 0xF100:
# prefix chunk; ignore it
self.__offset = self.__offset + i32(s)
self.fp.seek(self.__offset)
self.fp.seek(self.__offset + i32(s))
s = self.fp.read(16)

if i16(s, 4) == 0xF1FA:
Expand Down Expand Up @@ -111,6 +111,7 @@ def _palette(self, palette: list[tuple[int, int, int]], shift: int) -> None:
# load palette

i = 0
assert self.fp is not None
for e in range(i16(self.fp.read(2))):
s = self.fp.read(2)
i = i + s[0]
Expand Down
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