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32 lines
843 B
Python
32 lines
843 B
Python
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SEGY_REVISION_0 = 0x0000
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SEGY_REVISION_1 = 0x0100
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VARIANTS = {SEGY_REVISION_0: SEGY_REVISION_0,
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SEGY_REVISION_1: SEGY_REVISION_1,
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100: SEGY_REVISION_1,
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256: SEGY_REVISION_1}
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class SegYRevisionError(Exception):
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pass
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def canonicalize_revision(revision):
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"""Canonicalize a SEG Y revision.
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Various SEG Y revisions are seen in the wild; this function canonicalizes the supplies revision
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to either SEGY_REVISION_0 or SEGY_REVISION_1.
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Args:
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revision: Any object representing a SEG Y revision.
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Returns:
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Either SEGY_REVISION_0 or SEGY_REVISION_1.
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Raises:
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SegYRevisionError: If the revision is not known.
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"""
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try:
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return VARIANTS[revision]
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except KeyError:
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raise SegYRevisionError("Unknown SEG Y Revision {!r}".format(revision))
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