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#
# Python Imaging Library
# $Id$
#
# stuff to read GIMP palette files
#
# History:
# 1997-08-23 fl Created
# 2004-09-07 fl Support GIMP 2.0 palette files.
#
# Copyright (c) Secret Labs AB 1997-2004. All rights reserved.
# Copyright (c) Fredrik Lundh 1997-2004.
#
# See the README file for information on usage and redistribution.
#
from __future__ import annotations
import re
from io import BytesIO
from typing import IO
class GimpPaletteFile:
"""File handler for GIMP's palette format."""
rawmode = "RGB"
def _read(self, fp: IO[bytes], limit: bool = True) -> None:
if not fp.readline().startswith(b"GIMP Palette"):
msg = "not a GIMP palette file"
raise SyntaxError(msg)
palette: list[int] = []
i = 0
while True:
if limit and i == 256 + 3:
break
i += 1
s = fp.readline()
if not s:
break
# skip fields and comment lines
if re.match(rb"\w+:|#", s):
continue
if limit and len(s) > 100:
msg = "bad palette file"
raise SyntaxError(msg)
v = s.split(maxsplit=3)
if len(v) < 3:
msg = "bad palette entry"
raise ValueError(msg)
palette += (int(v[i]) for i in range(3))
if limit and len(palette) == 768:
break
self.palette = bytes(palette)
def __init__(self, fp: IO[bytes]) -> None:
self._read(fp)
@classmethod
def frombytes(cls, data: bytes) -> GimpPaletteFile:
self = cls.__new__(cls)
self._read(BytesIO(data), False)
return self
def getpalette(self) -> tuple[bytes, str]:
return self.palette, self.rawmode
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