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R8218/CT/private/dicom_add_item.m
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dicom_add_item.m
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function attr_str = dicom_add_item(attr_str, group, element, varargin)
%DICOM_ADD_ITEM Add an item/delimiter to a structure of attributes.
% OUT = DICOM_ADD_ITEM(IN, GROUP, ELEMENT)
% OUT = DICOM_ADD_ITEM(IN, GROUP, ELEMENT, DATA)
%
% This function is similar to DICOM_ADD_ATTR, but it doesn't allow
% specifying VR values and can only be used for attributes of group
% FFFE.
%
% See also DICOM_ADD_ATTR, DICOM_ADD_PIXEL_DATA.
% Copyright 1993-2010 The MathWorks, Inc.
% See PS-3.5 Sec. 7.5 for details on sequence and item encoding.
% Get group and element.
tmp.Group = get_group_or_element(group);
tmp.Element = get_group_or_element(element);
% Get data value.
if (nargin > 4)
error(message('images:dicom_add_item:tooManyInputArgs'));
elseif (nargin == 3)
tmp.Data = [];
else
tmp.Data = varargin{1};
end
tmp.VR = 'UN';
% Check the group and element values.
if (tmp.Group ~= 65534) % 0xFFFE == 65534
error(message('images:dicom_add_item:groupNotAccepted', sprintf( '%X', tmp.Group )))
end
switch (tmp.Element)
case {57344} % 0xE000 == 57344
% Data is okay for (FFFE,E000).
case {57357, 57565} % 0xE00D == 57357, 0XE0DD == 57565
if (~isempty(tmp.Data))
error(message('images:dicom_add_item:AttributeCannotHaveData', sprintf( '(%04X,%04X)', tmp.Group, tmp.Element )))
end
otherwise
error(message('images:dicom_add_item:attributeNotSupported', sprintf( '(%04X,%04X)', tmp.Group, tmp.Element )))
end
% Pad the data to an even byte boundary.
if (rem(getSizeInBytes(tmp.Data), 2) == 1)
tmp.Data(end + 1) = uint8(0);
end
% Store the data.
attr_str = cat(2, attr_str, tmp);
function numBytes = getSizeInBytes(data)
switch (class(data))
case {'uint8', 'int8'}
multiplier = 1;
case {'uint16', 'int16'}
multiplier = 2;
case {'uint32', 'int32', 'single'}
multiplier = 4;
case {'double'}
multiplier = 8;
end
numBytes = multiplier * numel(data);
function val = get_group_or_element(in)
if (isempty(in))
error(message('images:dicom_add_item:groupElementNotHexOrInt'))
elseif (ischar(in))
val = sscanf(in, '%x');
elseif (isnumeric(in))
val = in;
else
error(message('images:dicom_add_item:groupElementNotHexOrInt'))
end
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