Source code for PIL.DcxImagePlugin

#
# 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

__version__ = "0.2"

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.

[docs]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 i32(s) != MAGIC: raise SyntaxError("not a DCX file") # 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.seek(0) @property def n_frames(self): return len(self._offset) @property def is_animated(self): return len(self._offset) > 1
[docs] 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)
[docs] def tell(self): return self.frame
Image.register_open(DcxImageFile.format, DcxImageFile, _accept) Image.register_extension(DcxImageFile.format, ".dcx")