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/usr/lib/python2.7/dist-packages/PIL/McIdasImagePlugin.py is in python-pil 2.3.0-1ubuntu3.4.

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#
# The Python Imaging Library.
# $Id$
#
# Basic McIdas support for PIL
#
# History:
# 1997-05-05 fl  Created (8-bit images only)
# 2009-03-08 fl  Added 16/32-bit support.
#
# Thanks to Richard Jones and Craig Swank for specs and samples.
#
# Copyright (c) Secret Labs AB 1997.
# Copyright (c) Fredrik Lundh 1997.
#
# See the README file for information on usage and redistribution.
#

__version__ = "0.2"

import struct
from PIL import Image, ImageFile

def _accept(s):
    return s[:8] == b"\x00\x00\x00\x00\x00\x00\x00\x04"

##
# Image plugin for McIdas area images.

class McIdasImageFile(ImageFile.ImageFile):

    format = "MCIDAS"
    format_description = "McIdas area file"

    def _open(self):

        # parse area file directory
        s = self.fp.read(256)
        if not _accept(s) or len(s) != 256:
            raise SyntaxError("not an McIdas area file")

        self.area_descriptor_raw = s
        self.area_descriptor = w = [0] + list(struct.unpack("!64i", s))

        # get mode
        if w[11] == 1:
            mode = rawmode = "L"
        elif w[11] == 2:
            # FIXME: add memory map support
            mode = "I"; rawmode = "I;16B"
        elif w[11] == 4:
            # FIXME: add memory map support
            mode = "I"; rawmode = "I;32B"
        else:
            raise SyntaxError("unsupported McIdas format")

        self.mode = mode
        self.size = w[10], w[9]

        offset = w[34] + w[15]
        stride = w[15] + w[10]*w[11]*w[14]

        self.tile = [("raw", (0, 0) + self.size, offset, (rawmode, stride, 1))]

# --------------------------------------------------------------------
# registry

Image.register_open("MCIDAS", McIdasImageFile, _accept)

# no default extension