mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-11-10 19:56:47 +03:00
79 lines
1.8 KiB
Python
79 lines
1.8 KiB
Python
#
|
|
# 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.
|
|
#
|
|
|
|
__version__ = "0.2"
|
|
|
|
import Image
|
|
|
|
from PcxImagePlugin import PcxImageFile
|
|
|
|
MAGIC = 0x3ADE68B1 # QUIZ: what's this value, then?
|
|
|
|
def i32(c):
|
|
return ord(c[0]) + (ord(c[1])<<8) + (ord(c[2])<<16) + (ord(c[3])<<24)
|
|
|
|
def _accept(prefix):
|
|
return i32(prefix) == MAGIC
|
|
|
|
##
|
|
# Image plugin for the Intel DCX format.
|
|
|
|
class DcxImageFile(PcxImageFile):
|
|
|
|
format = "DCX"
|
|
format_description = "Intel DCX"
|
|
|
|
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.seek(0)
|
|
|
|
def seek(self, frame):
|
|
if frame >= len(self._offset):
|
|
raise EOFError("attempt to seek outside DCX directory")
|
|
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("DCX", DcxImageFile, _accept)
|
|
|
|
Image.register_extension("DCX", ".dcx")
|