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