mirror of https://github.com/ecmwf/eccodes.git
86 lines
2.8 KiB
Modula-2
86 lines
2.8 KiB
Modula-2
# (C) Copyright 2005- ECMWF.
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#
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# This software is licensed under the terms of the Apache Licence Version 2.0
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# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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#
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# In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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# virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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#
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constant ieeeFloats = 0 : hidden, edition_specific;
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transient eps=0;
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constant false=0 : hidden;
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constant true=1 : hidden;
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constant two=1 : hidden;
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constant three=1 : hidden;
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constant eight=8 : hidden;
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constant eleven=11 : hidden;
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constant epsPoint=1 : hidden;
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constant epsContinuous=11 : hidden;
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constant epsStatisticsPoint=2 : hidden;
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constant epsStatisticsContinous=12 : hidden;
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meta headersOnly headers_only();
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#template section_0 "grib1/section.0.def";
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meta gts_header gts_header() : no_copy,hidden,read_only;
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meta gts_TTAAii gts_header(20,6) : no_copy,hidden,read_only;
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meta gts_CCCC gts_header(27,4) : no_copy,hidden,read_only;
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meta gts_ddhh00 gts_header(32,6) : no_copy,hidden,read_only;
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ascii[4] identifier = "GRIB" : read_only,hidden;
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constant offsetSection0=0;
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constant section0Length=8;
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meta section0Pointer section_pointer(offsetSection0,section0Length,0);
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# Due to a trick done by GRIBEX to support large GRIBs, we need a special treatment
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# of the message length and of the section4 length, so instead of
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# section_length[3] totalLength;
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# we get:
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g1_message_length[3] totalLength(section4Length);
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position startOfHeaders;
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unsigned[1] editionNumber = 1 : edition_specific,dump;
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alias ls.edition = editionNumber;
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template section_1 "grib1/section.1.def";
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# Note flagbit numbers 7 to 0, while wmo is 1 to 8
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flagbit gridDescriptionSectionPresent(section1Flags,7) = 1;
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meta GDSPresent gds_is_present(gridDescriptionSectionPresent,gridDefinition,bitmapPresent,values): dump;
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#alias GDSPresent = gridDescriptionSectionPresent;
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flagbit bitmapPresent(section1Flags,6) :dump;
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alias bitmapSectionPresent=bitmapPresent;
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alias geography.bitmapPresent=bitmapPresent;
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alias missingValuesPresent=bitmapPresent : read_only;
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transient angleSubdivisions=1000; # milli degrees
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if(gridDescriptionSectionPresent){
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template section_2 "grib1/section.2.def";
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} else {
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template predefined_grid "grib1/predefined_grid.def";
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}
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# Used to mark end of headers. Can be accessed with grib_get_offset()
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position endOfHeadersMarker;
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meta lengthOfHeaders evaluate( endOfHeadersMarker-startOfHeaders);
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meta md5Headers md5(startOfHeaders,lengthOfHeaders);
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if (!headersOnly) {
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transient missingValue = 9999 : dump;
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if(bitmapPresent) {
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template section_3 "grib1/section.3.def";
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} else {
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constant tableReference = 0;
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}
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template section_4 "grib1/section.4.def";
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template section_5 "grib1/section.5.def";
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}
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