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R8218/private/parseDEsubheader20.m
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parseDEsubheader20.m
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function denitf_meta = parseDEsubheader20( fid, dataLength )
%PARSEDESUBHEADER20 Parse the Data Extension subheaders in an NITF file.
% DENITF_META = PARSEDESUBHEADER20
% Parse the Data Extension Segment Subheader for an NITF 2.0 file.
% Copyright 2007-2008 The MathWorks, Inc.
denitf_meta = struct([]);
fields = {'DE', 'FilePartType', 2
'DESTAG', 'UniqueDESTypeIdentifier', 25
'DESVER', 'VersionOfTheDataFieldDefinition', 2
'DESCLAS', 'DESecurityClassification', 1
'DESCODE', 'DECodewords', 40
'DESCTLH', 'DEControlAndHandling', 40
'DESREL', 'DEReleasingInstructions', 40
'DESCAUT', 'DEClassificationAuthority', 20
'DESCTLN', 'DESecurityControlNumber', 20
'DESDWNG', 'DESecurityDowngrade', 6};
denitf_meta = nitfReadMeta(denitf_meta, fields, fid);
%DESDWNG is DENITF_META(10) and the last item extracted in the loop above. Depending
%on its value there will be an DESDEVT
desdwng = sscanf(denitf_meta(end).value, '%f');
if desdwng == 999998
fields = {'DESDEVT', 'DEDowngradingEvent', 40};
denitf_meta = nitfReadMeta(denitf_meta, fields, fid);
end
%The following is conditional on the value of DESTAG which is denitf_meta(2)
destag = deblank(denitf_meta(2).value);
if strcmp(destag, 'Registered Extensions') || strcmp(destag,'Controlled Extensions')
fields = {'DESOFLW', 'OverflowedHeaderType', 6
'DESITEM', 'DataItemOverflowed', 3};
denitf_meta = nitfReadMeta(denitf_meta, fields, fid);
end
fields = {'DESSHL', 'LengthOfUserDefinedSubheaderFields', 4};
denitf_meta = nitfReadMeta(denitf_meta, fields, fid);
desshl = sscanf(denitf_meta(end).value, '%f');
if desshl ~= 0 % Then we'll have user defined fields
fields = {'DESSHF', 'UserDefinedSubheaderFields', desshl};
denitf_meta = nitfReadMeta(denitf_meta, fields, fid);
end
%DESDATA
%Contains either user-defined data or controlled/registered extensions
%Move the cursor through the Extension data
readforwardbytes = sscanf(dataLength, '%f');
fread(fid, readforwardbytes, 'uint8=>char');
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