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/usr/share/pyshared/PIL/PaletteFile.py is in python-imaging 1.1.7-4ubuntu0.12.04.3.

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#
# Python Imaging Library
# $Id$
#
# stuff to read simple, teragon-style palette files
#
# History:
#       97-08-23 fl     Created
#
# Copyright (c) Secret Labs AB 1997.
# Copyright (c) Fredrik Lundh 1997.
#
# See the README file for information on usage and redistribution.
#

import string

##
# File handler for Teragon-style palette files.

class PaletteFile:

    rawmode = "RGB"

    def __init__(self, fp):

        self.palette = map(lambda i: (i, i, i), range(256))

        while 1:

            s = fp.readline()

            if not s:
                break
            if s[0] == "#":
                continue
            if len(s) > 100:
                raise SyntaxError, "bad palette file"

            v = map(int, string.split(s))
            try:
                [i, r, g, b] = v
            except ValueError:
                [i, r] = v
                g = b = r

            if 0 <= i <= 255:
                self.palette[i] = chr(r) + chr(g) + chr(b)

        self.palette = string.join(self.palette, "")


    def getpalette(self):

        return self.palette, self.rawmode