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