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84 lines
2.1 KiB
Python
84 lines
2.1 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# DCX file handling
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#
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# DCX is a container file format defined by Intel, commonly used
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# for fax applications. Each DCX file consists of a directory
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# (a list of file offsets) followed by a set of (usually 1-bit)
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# PCX files.
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#
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# History:
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# 1995-09-09 fl Created
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# 1996-03-20 fl Properly derived from PcxImageFile.
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# 1998-07-15 fl Renamed offset attribute to avoid name clash
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# 2002-07-30 fl Fixed file handling
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#
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# Copyright (c) 1997-98 by Secret Labs AB.
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# Copyright (c) 1995-96 by Fredrik Lundh.
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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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from . import Image
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from ._binary import i32le as i32
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from ._util import DeferredError
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from .PcxImagePlugin import PcxImageFile
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MAGIC = 0x3ADE68B1 # QUIZ: what's this value, then?
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def _accept(prefix: bytes) -> bool:
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return len(prefix) >= 4 and i32(prefix) == MAGIC
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##
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# Image plugin for the Intel DCX format.
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class DcxImageFile(PcxImageFile):
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format = "DCX"
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format_description = "Intel DCX"
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_close_exclusive_fp_after_loading = False
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def _open(self) -> None:
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# Header
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s = self.fp.read(4)
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if not _accept(s):
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msg = "not a DCX file"
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raise SyntaxError(msg)
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# Component directory
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self._offset = []
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for i in range(1024):
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offset = i32(self.fp.read(4))
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if not offset:
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break
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self._offset.append(offset)
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self._fp = self.fp
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self.frame = -1
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self.n_frames = len(self._offset)
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self.is_animated = self.n_frames > 1
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self.seek(0)
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def seek(self, frame: int) -> None:
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if not self._seek_check(frame):
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return
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if isinstance(self._fp, DeferredError):
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raise self._fp.ex
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self.frame = frame
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self.fp = self._fp
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self.fp.seek(self._offset[frame])
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PcxImageFile._open(self)
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def tell(self) -> int:
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return self.frame
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Image.register_open(DcxImageFile.format, DcxImageFile, _accept)
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Image.register_extension(DcxImageFile.format, ".dcx")
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