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#
# The Python Imaging Library.
# $Id$
#
# IM Tools support for PIL
#
# history:
# 1996-05-27 fl Created (read 8-bit images only)
# 2001-02-17 fl Use 're' instead of 'regex' (Python 2.1) (0.2)
#
# Copyright (c) Secret Labs AB 1997-2001.
# Copyright (c) Fredrik Lundh 1996-2001.
#
# See the README file for information on usage and redistribution.
#
from __future__ import annotations
import re
from . import Image, ImageFile
#
# --------------------------------------------------------------------
field = re.compile(rb"([a-z]*) ([^ \r\n]*)")
##
# Image plugin for IM Tools images.
class ImtImageFile(ImageFile.ImageFile):
format = "IMT"
format_description = "IM Tools"
def _open(self) -> None:
# Quick rejection: if there's not a LF among the first
# 100 bytes, this is (probably) not a text header.
assert self.fp is not None
buffer = self.fp.read(100)
if b"\n" not in buffer:
msg = "not an IM file"
raise SyntaxError(msg)
xsize = ysize = 0
while True:
if buffer:
s = buffer[:1]
buffer = buffer[1:]
else:
s = self.fp.read(1)
if not s:
break
if s == b"\x0C":
# image data begins
self.tile = [
(
"raw",
(0, 0) + self.size,
self.fp.tell() - len(buffer),
(self.mode, 0, 1),
)
]
break
else:
# read key/value pair
if b"\n" not in buffer:
buffer += self.fp.read(100)
lines = buffer.split(b"\n")
s += lines.pop(0)
buffer = b"\n".join(lines)
if len(s) == 1 or len(s) > 100:
break
if s[0] == ord(b"*"):
continue # comment
m = field.match(s)
if not m:
break
k, v = m.group(1, 2)
if k == b"width":
xsize = int(v)
self._size = xsize, ysize
elif k == b"height":
ysize = int(v)
self._size = xsize, ysize
elif k == b"pixel" and v == b"n8":
self._mode = "L"
#
# --------------------------------------------------------------------
Image.register_open(ImtImageFile.format, ImtImageFile)
#
# no extension registered (".im" is simply too common)
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