dicom_has_fmeta.m
1ba0b9dff245Bashardoust_SystCoord

dicom_has_fmeta.m
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			function has_fmeta = dicom_has_fmeta(file)
			%DICOM_HAS_FMETA Determines whether a message contains file metadata.
			% TF = DICOM_HAS_FMETA(FILE) Returns 1 if FILE has file metadata, 0
			% otherwise. File metadata are attributes whose groups are 2 - 7.

			% Copyright 1993-2010 The MathWorks, Inc.

			fseek(file.FID, 128, 'bof');

			if (ftell(file.FID) ~= 128)
			% File is too short to have 128 byte preamble: no file metadata.
			has_fmeta = false;
			fseek(file.FID, 0, 'bof');

			return

			end

			% Look for the format string 'DICM'.
			fmt_string = fread(file.FID, 4, 'uchar');

			has_fmeta = isequal(fmt_string, [68 73 67 77]');

			% Very rarely a file will have file metadata but not a preamble.
			if (~has_fmeta)

			has_fmeta = has_group0002_without_preamble(file);
			fseek(file.FID, 0, 'bof');

			end



			function tf = has_group0002_without_preamble(file)

			fseek(file.FID, 0, 'bof');
			group = fread(file.FID, 1, 'uint16=>uint16');

			tf = ((group == 2) \|\| (swapbytes(group) == 2));