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R8218/private/parsetextsubheader20.m
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parsetextsubheader20.m
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function tsnitf_meta = parsetextsubheader20( fid, dataLength )
%PARSETEXTSUBHEADER20 Parse the Text subheaders in an NITF file.
% TSNITF_META = PARSETEXTSUBHEADER20
% Parse the Text Segment Subheader for an NITF 2.0 file.
% Copyright 2007-2008 The MathWorks, Inc.
tsnitf_meta = struct([]);
fields = {'TE', 'FilePartType', 2
'TEXTID', 'TextID', 10
'TXTDT', 'TextDateAndTime', 14
'TXTITL', 'TextTitle', 80
'TSCLAS', 'TextSecurityClassification', 1
'TSCODE', 'TextCodewords', 40
'TSCTLH', 'TextControlAndHandling', 40
'TSREL', 'TextReleasingInstructions', 40
'TSCAUT', 'TextClassificationAuthority', 20
'TSCTLN', 'TextSecurityControlNumber', 20
'TSDWNG', 'TextSecurityDowngrade', 6};
tsnitf_meta = nitfReadMeta(tsnitf_meta, fields, fid);
%TSDWNG is TSNITF_META(11) and the last item extracted in the loop above. Depending
%on its value there will be an TSDEVT
tsdwng = sscanf(tsnitf_meta(end).value, '%f');
if tsdwng == 999998
fields = {'TSDEVT', 'TextDowngradingEvent', 40};
tsnitf_meta = nitfReadMeta(tsnitf_meta, fields, fid);
end
%ENCRYP
fields = {'ENCRYP', 'Encryption', 1
'TXTFMT', 'TextFormat', 3
'TXSHDL', 'ExtendedSubheaderDataLength', 5};
tsnitf_meta = nitfReadMeta(tsnitf_meta, fields, fid);
txshdl = sscanf(tsnitf_meta(end).value, '%f');
if txshdl ~= 0
fields = {'TXSOFL', 'ExtendedSubheaderOverflow', 3
'TXSHD', 'ExtendedSubheaderData', txshdl - 3};
tsnitf_meta = nitfReadMeta(tsnitf_meta, fields, fid);
end
%Move the cursor through the Text data
readforwardbytes = sscanf(dataLength, '%f');
fread(fid, readforwardbytes, 'uint8=>char');
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