WriteSuStructure.m

% WriteSuStructure : writes data to disk using SU-CWP format
%
% EX
% WriteSuStructure('datacube.su',SuHeader,SuTraceHeaders,Data);

%
% (C) 2001-2004 Thomas Mejer Hansen, tmh@gfy.ku.dk/thomas@cultpenguin.com
% 
%    This program is free software; you can redistribute it and/or modify
%    it under the terms of the GNU General Public License as published by
%    the Free Software Foundation; either version 2 of the License, or
%    (at your option) any later version.
%
%    This program is distributed in the hope that it will be useful,
%    but WITHOUT ANY WARRANTY; without even the implied warranty of
%    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%    GNU General Public License for more details.
%
%    You should have received a copy of the GNU General Public License
%    along with this program; if not, write to the Free Software
%    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
%
%
function WriteSuStructure(filename,SegyTraceHeaders,Data,SegyHeader)

if nargin<3;
    SegymatVerbose(sprintf('%s: Neads at least filename,SuTraceHeaders and Data',mfilename,filename),0)
    return
end    
if nargin<4
    SegyHeader.Rev=GetSegyHeaderBasics;
    SegyHeader.FixedLengthTraceFlag=1;
end
% FORCE THE USE OF IEEE
SegyHeader.SegyFormatRevisionNumber=100;
SegyHeader.DataSampleFormat=5; % IEEE 



SegymatVerbose(sprintf('%s: writing to %s',mfilename,filename),0)


segyid = fopen(filename,'w');   % USE LOCAL ENDIAN FLAG,
% I.E. ENDIAN FORMAT NOT SPECIFIED
% segyid = fopen(filename,'w','b'); % BIG ENDIAN

ntraces=size(Data,2);
for i=1:ntraces;
    if (i/1000)==round(i/1000),
      SegymatVerbose(['writing trace ',num2str(i),' of ',num2str(ntraces),', filepos=',num2str(ftell(segyid))],0)
      SegymatVerbose(SegyTraceHeaders(i).ns,1)
    end
    PutSegyTrace(segyid,Data(:,i),SegyTraceHeaders(i),SegyHeader);
end
fclose(segyid);