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R8218/CT/private/parseDEsubheader.m
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parseDEsubheader.m
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function [ denitf_meta ] = parseDEsubheader( fid, dataLength )
%PARSEDESUBHEADER Parse the Data Extension subheaders in an NITF file.
% DENITF_META = PARSEDESUBHEADER
% Parse the Data Extension Segment Subheader for an NITF 2.1 file.
% Copyright 2007-2008 The MathWorks, Inc.
denitf_meta = struct([]);
fields = {'DE', 'FilePartType', 2
'DESTAG', 'UniqueDESTypeIdentifier', 25
'DESVER', 'VersionOfTheDataFieldDefinition', 2
'DESCLAS', 'DESecurityClassification', 1
'DESCLSY', 'DESecurityClassificationSystem', 2
'DESCODE', 'DECodewords', 11
'DESCTLH', 'DEControlAndHandling', 2
'DESREL', 'DEReleasingInstructions', 20
'DESDCTP', 'DEDeclassificationType', 2
'DESDCDT', 'DEDeclassificationDate', 8
'DESDCXM', 'DEDeclassificationExemption', 4
'DESDG', 'DEDowngrade', 1
'DESDGT', 'DEDowngradeDate', 8
'DESCLTX', 'DEClassificationText', 43
'DESCATP', 'DEClassificationAuthorityType' 1
'DESCAUT', 'DEClassificationAuthority', 40
'DESCRSN', 'DEClassificationReason', 1
'DESSRDT', 'DESecuritySourceDate', 8
'DESCTL', 'DESecurityControlNumber', 15};
denitf_meta = nitfReadMeta(denitf_meta, fields, fid);
% DESOFLW is present if DESTAG = TRE_OVERFLOW.
if (isequal(deblank(denitf_meta(2).value), 'TRE_OVERFLOW'))
fields = {'DESOFLW', 'OverflowedHeaderType', 6
'DESITEM', 'DataItemOverflowed', 3};
denitf_meta = nitfReadMeta(denitf_meta, fields, fid);
end
%DESSHL
fields = {'DESSHL', 'LengthOfUserDefinedSubheaderFields', 4};
denitf_meta = nitfReadMeta(denitf_meta, fields, fid);
desshl = sscanf(denitf_meta(end).value, '%f');
if desshl ~= 0 % The 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. Return as raw bytes.
readforwardbytes = sscanf(dataLength, '%f');
denitf_meta(end + 1).name = 'DESDATA';
denitf_meta(end).vname = 'UserDefinedData';
denitf_meta(end).value = fread(fid, readforwardbytes, 'uint8=>uint8');
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