1 files changed, 78 insertions, 0 deletions
diff --git a/PIL/DcxImagePlugin.py b/PIL/DcxImagePlugin.py
new file mode 100644
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+++ b/PIL/DcxImagePlugin.py
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+#
+# The Python Imaging Library.
+# $Id: DcxImagePlugin.py 2134 2004-10-06 08:55:20Z fredrik $
+#
+# 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, ImageFile
+
+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")