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R8218/CT/private/parsegraphicsubheader.m
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parsegraphicsubheader.m
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function gsnitf_meta = parsegraphicsubheader( fid, dataLength )
%PARSEGRAPHICSUBHEADER Parse the Graphic subheaders in an NITF file.
% GSNITF_META = PARSEGRAPHICSUBHEADER
% Parse the Graphic Segment Subheader for an NITF 2.1 file.
% Copyright 2007-2008 The MathWorks, Inc.
% Initialize the graphic subheader structure
gsnitf_meta = struct([]);
fields = {'SY', 'FilePartType', 2
'SID', 'GraphicID', 10
'SNAME', 'GraphicName', 20
'SSCLAS', 'GraphicSecurityClassification', 1
'SSCLSY', 'GraphicSecurityClassificationSystem', 2
'SSCODE', 'GraphicCodewords', 11
'SSCTLH', 'GraphicControlAndHandling', 2
'SSREL', 'GraphicReleasingInstructions', 20
'SSDCTP', 'GraphicDeclassificationType', 2
'SSDCDT', 'GraphicDeclassificationDate', 8
'SSDCXM', 'GraphicDeclassificationExemption', 4
'SSDG', 'GraphicDowngrade', 1
'SSDGT', 'GraphicDowngradeDate', 8
'SSCLTX', 'GraphicClassificationText', 43
'SSCATP', 'GraphicClassificationAuthorityType', 1
'SSCAUT', 'GraphicClassificationAuthority', 40
'SSCRSN', 'GraphicClassificationReason', 1
'SSSRDT', 'GraphicSecuritySourceDate', 8
'SSCTLN', 'GraphicSecurityControlNumber', 15
'ENCRYP', 'Encryption', 1
'STYPE', 'GraphicType', 1
'SRES1', 'ReservedForFutureUse', 13
'SDLVL', 'DisplayLevel', 3
'SALVL', 'GraphicAttachmentLevel', 3
'SLOC', 'GraphicLocation', 10
'SBND1', 'FirstGraphicBoundLocation', 10
'SCOLOR', 'GraphicColor', 1
'SBND2', 'SecondGraphicBoundLocation', 10
'SRES2', 'ReservedForFutureUse', 2
'SXSHDL', 'ExtendedSubheaderDataLength', 5};
gsnitf_meta = nitfReadMeta(gsnitf_meta, fields, fid);
%SXSHDL is GSNITF_META(30) and the last item extracted in the loop above. Depending
%on its value there will be an SXSOFL or Extended Subheader Overflow field and SXSHD field.
%If SXSHDL is not zeros, add the SXSOFL and SXSHD fields to the meta data struct
%and insert values.
sxshdl = sscanf(gsnitf_meta(30).value, '%f');
if sxshdl ~= 0
fields = {'SXSOFL', 'ExtendedSubheaderOverflow', 3
'SXSHD', 'ExtendedSubheaderData', sxshdl - 3};
gsnitf_meta = nitfReadMeta(gsnitf_meta, fields, fid);
end
%Move the cursor through the graphic data
readforwardbytes = sscanf(dataLength, '%f');
fread(fid, readforwardbytes, 'uint8=>char');
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