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R8218/private/isanalyze75.m
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isanalyze75.m
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function TF = isanalyze75(filename)
%ISANALYZE75 Return true for a header file of a Mayo Analyze 7.5 data set.
%
% TF = ISANALYZE75(FILENAME) returns TRUE if FILENAME is a header file of
% a Mayo Analyze 7.5 data set.
%
% FILENAME is considered to be a valid header file of a Mayo Analyze 7.5
% data set if the header size is 348 bytes.
%
% Example
% -------
% TF = isanalyze75('brainMRI.hdr');
%
% See also ANALYZE75INFO, ANALYZE75READ.
% Copyright 2005-2011 The MathWorks, Inc.
% Check the number of input arguments.
narginchk(1,1);
% Check if filename is a string.
if ~isa(filename,'char')
error(message('images:isanalyze75:invalidInputArgument'))
end
% Open the HDR file
fid = analyze75open(filename, 'hdr', 'r');
% Check headerSize
TF = validateHeaderSize(fid, filename);
% Close the file
fclose(fid);
%%%
%%% Function validateHeaderSize
%%%
function TF = validateHeaderSize(fid, filename)
% Analyze 7.5 format standard header size
analyzeHeader = int32(348);
% Interfile header - swapbytes(typecast(uint8('!INT'), 'int32'))
interfileHeader = int32(558452308);
% Possible extended header size
extendedRange = int32([348 2000]);
% Read headerSize.
headerSize = fread(fid, 1, 'int32=>int32');
swappedHeaderSize = swapbytes(headerSize);
% Compare with Standard Analyze 7.5 headerSize.
if ((headerSize == analyzeHeader)||(swappedHeaderSize == analyzeHeader))
TF = true;
% Compare with Interfile header
elseif ((headerSize == interfileHeader) || ...
(swappedHeaderSize == interfileHeader))
TF = false;
% Check for extended headerSize
elseif ((headerSize > extendedRange(1)) ...
&& (headerSize < extendedRange(2))) ...
|| ((swappedHeaderSize > extendedRange(1)) ...
&& (swappedHeaderSize < extendedRange(2)))
% Return true but warn that this may not be a valid Analyze 7.5 file
TF = true;
warning(message('images:isanalyze75:incorrectHeaderSize', filename'));
% Invalid headerSize
else
TF = false;
end
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