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R8218/CT/private/parsetextsubheader.m
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parsetextsubheader.m
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function tsnitf_meta = parsetextsubheader( fid, dataLength )
%PARSETEXTSUBHEADER Parse the Text subheaders in an NITF file.
% TSNITF_META = PARSETEXTSUBHEADER
% Parse the Text Segment Subheader for an NITF 2.1 file.
% Copyright 2007-2008 The MathWorks, Inc.
tsnitf_meta = struct([]);
fields = {'TE', 'FilePartType', 2
'TEXTID', 'TextID', 7
'TXTALVAL', 'TextAttachmentLevel', 3
'TXTDT', 'TextDateAndTime', 14
'TXTITL', 'TextTitle', 80
'TSCLAS', 'TextSecurityClassification', 1
'TSCLSY', 'TextSecurityClassificationSystem', 2
'TSCODE', 'TextCodewords', 11
'TSCTLH', 'TextControlAndHandling', 2
'TSREL', 'TextReleasingInstructions', 20
'TSDCTP', 'TextDeclassificationType', 2
'TSDCDT', 'TextDeclassificationDate', 8
'TSDCXM', 'TextDeclassificationExemption', 4
'TSDG', 'TextDowngrade', 1
'TSDGT', 'TextDowngradeDate', 8
'TSCLTX', 'TextClassificationText', 43
'TSCATP', 'TextClassificationAuthorityType', 1
'TSCAUT', 'TextClassificationAuthority', 40
'TSCRSN', 'TextClassificationReason', 1
'TSSRDT', 'TextSecuritySourceDate', 8
'TSCTLN', 'TextSecurityControlNumber', 15
'ENCRYP', 'Encryption', 1
'TXTFMT', 'TextFormat', 3
'TXSHDL', 'ExtendedSubheaderDataLength', 5};
tsnitf_meta = nitfReadMeta(tsnitf_meta, fields, fid);
%TXSHDL is TSMETA_INFO(24) and the last item extracted in the loop above. Depending
%on its value there will be an TXSOFL or Extended Subheader Overflow field and TXSHD field.
%If TXSHDL is not zeros, add the TXSOFL and TXSHD fields to the meta data struct
%and insert values.
txshdl = sscanf(tsnitf_meta(24).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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