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74 lines
1.7 KiB
Python
74 lines
1.7 KiB
Python
#
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# The Python Imaging Library.
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# $Id: McIdasImagePlugin.py 2134 2004-10-06 08:55:20Z fredrik $
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#
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# Basic McIdas support for PIL
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#
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# History:
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# 97-05-05 fl Created (8-bit images only)
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#
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# Thanks to Richard Jones <richard.jones@bom.gov.au> for specs
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# and samples.
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#
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# Copyright (c) Secret Labs AB 1997.
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# Copyright (c) Fredrik Lundh 1997.
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#
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# See the README file for information on usage and redistribution.
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#
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__version__ = "0.1"
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import string
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import Image, ImageFile
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def i16(c,i=0):
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return ord(c[1+i])+(ord(c[i])<<8)
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def i32(c,i=0):
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return ord(c[3+i])+(ord(c[2+i])<<8)+(ord(c[1+i])<<16)+(ord(c[i])<<24)
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def _accept(s):
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return i32(s) == 0 and i32(s, 4) == 4
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##
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# Image plugin for McIdas area images.
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class McIdasImageFile(ImageFile.ImageFile):
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format = "MCIDAS"
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format_description = "McIdas area file"
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def _open(self):
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# parse area file directory
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s = self.fp.read(256)
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if not _accept(s):
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raise SyntaxError, "not an McIdas area file"
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# get mode
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if i32(s, 40) != 1 or i32(s, 52) != 1:
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raise SyntaxError, "unsupported McIdas format"
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self.mode = "L"
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# get size
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self.size = i32(s, 36), i32(s, 32)
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# setup image descriptor
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prefix = i32(s, 56)
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offset = i32(s, 132)
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self.tile = [("raw", (0, 0) + self.size, offset,
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("L", prefix + self.size[0], 1))]
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# FIXME: should store the navigation and calibration blocks
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# somewhere (or perhaps extract some basic information from
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# them...)
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# --------------------------------------------------------------------
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# registry
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Image.register_open("MCIDAS", McIdasImageFile, _accept)
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# no default extension
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