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R8218/CT/private/dicom_generate_uid.m
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dicom_generate_uid.m
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function uid = dicom_generate_uid(uid_type)
%DICOM_GENERATE_UID Create a globally unique ID.
% UID = DICOM_GENERATE_UID(TYPE) creates a unique identifier (UID) of
% the specified type. TYPE must be one of the following:
%
% 'instance' - A UID for any arbitrary DICOM object
% 'ipt_root' - The root of the Image Processing Toolbox's UID
% 'series' - A UID for an arbitrary series of DICOM images
% 'study' - A UID for an arbitrary study of DICOM series
%
% See also MWGUIDGEN.
% Copyright 1993-2012 The MathWorks, Inc.
% This is the UID root assigned to us. It prevents collisions with UID
% generation schemes from other vendors.
ipt_root = '1.3.6.1.4.1.9590.100.1';
switch (uid_type)
case {'ipt_root'}
uid = ipt_root;
case {'instance', 'series', 'study'}
switch (lower(computer()))
case {'pcwin', 'pcwin64'}
guid_32bit = create_guid_windows();
uid = guid_to_uid(ipt_root, guid_32bit);
case {'glnxa64', 'glnx86'}
guid_32bit = create_guid_linux();
uid = guid_to_uid(ipt_root, guid_32bit);
case {'maci', 'maci64'}
guid_32bit = create_guid_mac();
uid = guid_to_uid(ipt_root, guid_32bit);
otherwise
error(message('images:dicom_generate_uid:unsupportedPlatform'))
end
otherwise
error(message('images:dicom_generate_uid:inputValue', uid_type));
end
function guid_32bit = create_guid_linux
[status, raw_guid] = system('uuidgen');
if (status ~= 0)
[status, raw_guid] = system('cat /proc/sys/kernel/random/uuid');
if (status ~= 0)
error(message('images:dicom_generate_uid:linuxSystemProblem'))
end
end
tmp_guid = strip_unix_messages(raw_guid);
guid_32bit = sscanf(strrep(tmp_guid, '-', ''), '%08x');
function guid_32bit = create_guid_mac
[status, raw_guid] = system('uuidgen');
if (status ~= 0)
error(message('images:dicom_generate_uid:macSystemProblem'))
end
tmp_guid = strip_unix_messages(raw_guid);
guid_32bit = sscanf(strrep(tmp_guid, '-', ''), '%08x');
function guid_32bit = create_guid_windows
% Generate a GUID as a series of 16 UINT8 values.
guid_8bit = mwguidgen;
% Convert the bytes to four UINT32 values.
guid_32bit = dicom_typecast(guid_8bit, 'uint32');
function uid = guid_to_uid(ipt_root, guid_32bit)
% Convert a group of numeric values into a concatenated string.
guid = '';
for p = 1:length(guid_32bit)
guid = [guid sprintf('%010.0f', double(guid_32bit(p)))]; %#ok<AGROW>
end
% The maximum decimal representation of four concatenated 32-bit values
% is 40 digits long, which is one digit too many for the UID container in
% DICOM (after you add in the UID root). Shorten it to fit in DICOM's
% length requirements by removing a value from the middle. (As a result,
% 1 in every 10^39 values will be a duplicate.)
guid(13) = '';
% The DICOM standard requires the digit that follows a dot to be
% nonzero. Removing the leading zeros does not cause duplication.
guid = remove_leading_zeros(guid);
% Append the GUID to the UID root. The intervening digit is the version
% number of the UID generation scheme. Increment the version number if
% the rule/mechanism for generating "guid" changes. (The next scheme version
% number should be 4; skip 3, which is being used for implementation UIDs.)
uid = [ipt_root '.2.' guid];
function out = remove_leading_zeros(in)
out = in;
while (out(1) == '0')
out(1) = '';
end
function out = strip_unix_messages(in)
% It's possible that sourcing a shell configuration file (or
% another part of the shell launch) causes a message to appear in
% the system() output. Strip out everything but the GUID value,
% which we must assume to be the last full line.
out = in;
newLine = sprintf('\n');
idx = find(in == newLine);
if (numel(idx) > 1)
out(1:idx(end-1)) = '';
end
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