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# -*- coding: utf-8 -*-
""" Blockette 030: Data Format Dictionary Blockette.
All volumes, with the exception of miniSEED data records, must have a Data Format Dictionary Blockette [30]. Each Channel Identifier Blockette [52] has a reference (field 16) back to a Data Format Dictionary Blockette [30], so that SEED reading programs will know how to decode data for the channels. Because every kind of data format requires an entry in the Data Format Dictionary Blockette [30], each recording network needs to list entries for each data format, if a heterogeneous mix of data formats are included in a volume. This data format dictionary is used to decompress the data correctly.
Sample: 0300086CDSN Gain-Ranged Format~000200104M0~W2 D0-13 A-8191~D1415~ P0:#0,1:#2,2:#4,3:#7~ """
VariableString(3, "Short descriptive name", 1, 50, 'UNLPS'), Integer(4, "Data format identifier code", 4), Integer(5, "Data family type", 3), Integer(6, "Number of decoder keys", 2), # REPEAT field 7 for the Number of decoder keys: Loop("Decoder keys", "Number of decoder keys", [ VariableString(7, "Decoder keys", flags='UNLPS')], omit_tag=True), ] |