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R8218/CT/private/parselabelsubheader20.m
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parselabelsubheader20.m
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function lsnitf_meta = parselabelsubheader20( fid, dataLength )
%PARSELABELSUBHEADER20 Parse the Label subheaders in an NITF file.
% LSNITF_META = PARSELABELSUBHEADER20
% Parse the Label Segment Subheader for an NITF 2.0 file.
% Copyright 2007-2008 The MathWorks, Inc.
lsnitf_meta = struct([]);
fields = {'LA', 'FilePartType', 2
'LID', 'LabelID', 10
'LSCLAS', 'LabelSecurityClassification', 1
'LSCODE', 'LabelCodewords', 40
'LSCTLH', 'LabelControlAndHandling', 40
'LSREL', 'LabelReleasingInstructions', 40
'LSCAUT', 'LabelClassificationAuthority', 20
'LSCTLN', 'LabelSecurityControlNumber', 20
'LSDWNG', 'LabelSecurityDowngrade', 6};
lsnitf_meta = nitfReadMeta(lsnitf_meta, fields, fid);
%LSDWNG is LSnitf_meta(9) and the last item extracted in the loop above. Depending
%on its value there will be an SSDEVT
lsdwng = sscanf(lsnitf_meta(end).value, '%f');
if lsdwng == 999998
fields = {'LSDEVT', 'LabelDowngradingEvent', 40};
lsnitf_meta = nitfReadMeta(lsnitf_meta, fields, fid);
end
fields = {'ENCRYP', 'Encryption', 1
'LFS', 'LabelFontStyle', 1
'LCW', 'LabelCellWidth', 2
'LCH', 'LabelCellHeight', 2
'LDLVL', 'DisplayLevel', 3
'LALVL', 'LabelAttachmentLevel', 3
'LLOC', 'LabelLocation', 10
'LTC', 'LabelTextColor', 3
'LBC', 'LabelBackgroundColor', 3
'LXSHDL', 'ExtendedSubheaderDataLength', 5};
lsnitf_meta = nitfReadMeta(lsnitf_meta, fields, fid);
%LXSOFL and LCSHD
lxshdl = sscanf(lsnitf_meta(end).value, '%f');
if lxshdl ~= 0
fields = {'LXSOFL', 'ExtendedSubheaderOverflow', 3
'LXSHD', 'ExtendedSubheaderData', lxshdl - 3};
lsnitf_meta = nitfReadMeta(lsnitf_meta, fields, fid);
end
%Move the cursor through the Label data
readforwardbytes = sscanf(dataLength, '%f');
fread(fid, readforwardbytes, 'uint8=>char');
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