/usr/share/pyshared/dicom/UID.py is in python-dicom 0.9.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | # UID.py
"""Dicom Unique identifiers"""
# Copyright (c) 2008 Darcy Mason
# This file is part of pydicom, released under a modified MIT license.
# See the file license.txt included with this distribution, also
# available at http://pydicom.googlecode.com
import os
import uuid
import time
import datetime
from math import fabs
from _UID_dict import UID_dictionary
class InvalidUID(Exception):
'''
Throw when DICOM UID is invalid
Example of invalid UID::
>>> uid = '1.2.123.'
'''
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value)
class UID(str):
"""Subclass python string so have human-friendly UIDs
Use like:
uid = UID('1.2.840.10008.1.2.4.50')
then
uid.name, uid.type, uid.info, and uid.is_retired all return
values from the UID_dictionary
String representation (__str__) will be the name,
__repr__ will be the full 1.2.840....
"""
def __new__(cls, val):
"""Set up new instance of the class"""
# Don't repeat if already a UID class -- then may get the name
# that str(uid) gives rather than the dotted number
if isinstance(val, UID):
return val
else:
if isinstance(val, basestring):
return super(UID, cls).__new__(cls, val.strip())
else:
raise TypeError("UID must be a string")
def __init__(self, val):
"""Initialize the UID properties
Sets name, type, info, is_retired, and is_transfer_syntax.
If UID is a transfer syntax, also sets is_little_endian,
is_implicit_VR, and is_deflated boolean values.
"""
# Note normally use __new__ on subclassing an immutable, but here we
# just want to do some pre-processing against the UID dictionary.
# "My" string can never change (it is a python immutable), so is safe
if self in UID_dictionary:
self.name, self.type, self.info, retired = UID_dictionary[self]
self.is_retired = bool(retired)
else:
self.name = str.__str__(self)
self.type, self.info, self.is_retired = (None, None, None)
# If the UID represents a transfer syntax, store info about that syntax
self.is_transfer_syntax = (self.type == "Transfer Syntax")
if self.is_transfer_syntax:
# Assume a transfer syntax, correct it as necessary
self.is_implicit_VR = True
self.is_little_endian = True
self.is_deflated = False
if val == '1.2.840.10008.1.2': # implicit VR little endian
pass
elif val == '1.2.840.10008.1.2.1': # ExplicitVRLittleEndian
self.is_implicit_VR = False
elif val == '1.2.840.10008.1.2.2': # ExplicitVRBigEndian
self.is_implicit_VR = False
self.is_little_endian = False
elif val == '1.2.840.10008.1.2.1.99': # DeflatedExplicitVRLittleEndian:
self.is_deflated = True
self.is_implicit_VR = False
else:
# Any other syntax should be Explicit VR Little Endian,
# e.g. all Encapsulated (JPEG etc) are ExplVR-LE by Standard PS 3.5-2008 A.4 (p63)
self.is_implicit_VR = False
def __str__(self):
"""Return the human-friendly name for this UID"""
return self.name
def __eq__(self, other):
"""Override string equality so either name or UID number match passes"""
if str.__eq__(self, other) is True: # 'is True' needed (issue 96)
return True
if str.__eq__(self.name, other) is True: # 'is True' needed (issue 96)
return True
return False
def is_valid(self):
'''
Raise an exception is the UID is invalid
Usage example::
>>> invalid_uid = dicom.UID.UID('1.2.345.')
>>> invalid_uid.is_valid(invalid_uid)
InvalidUID: 'Trailing dot at the end of the UID'
>>> valid_uid = dicom.UID.UID('1.2.123')
'''
if self[-1] == '.':
raise InvalidUID('Trailing dot at the end of the UID')
# For python 3, any override of __cmp__ or __eq__ immutable requires
# explicit redirect of hash function to the parent class
# See http://docs.python.org/dev/3.0/reference/datamodel.html#object.__hash__
def __hash__(self):
return super(UID, self).__hash__()
ExplicitVRLittleEndian = UID('1.2.840.10008.1.2.1')
ImplicitVRLittleEndian = UID('1.2.840.10008.1.2')
DeflatedExplicitVRLittleEndian = UID('1.2.840.10008.1.2.1.99')
ExplicitVRBigEndian = UID('1.2.840.10008.1.2.2')
NotCompressedPixelTransferSyntaxes = [ExplicitVRLittleEndian,
ImplicitVRLittleEndian,
DeflatedExplicitVRLittleEndian,
ExplicitVRBigEndian]
# Many thanks to the Medical Connections for offering free valid UIDs (http://www.medicalconnections.co.uk/FreeUID.html)
# Their service was used to obtain the following root UID for pydicom:
pydicom_root_UID = '1.2.826.0.1.3680043.8.498.'
pydicom_UIDs = {
pydicom_root_UID + '1': 'ImplementationClassUID',
}
def generate_uid(prefix=pydicom_root_UID, truncate=False):
'''
Generate a dicom unique identifier based on host id, process id and current
time. The max lenght of the generated UID is 64 caracters.
If the given prefix is ``None``, the UID is generated following the method
described on `David Clunie website
<http://www.dclunie.com/medical-image-faq/html/part2.html#UID>`_
Usage example::
>>> dicom.UID.generate_uid()
1.2.826.0.1.3680043.8.498.2913212949509824014974371514
>>> dicom.UID.generate_uid(None)
2.25.31215762025423160614120088028604965760
This method is inspired from the work of `DCMTK
<http://dicom.offis.de/dcmtk.php.en>`_.
:param prefix: The site root UID. Default to pydicom root UID.
'''
max_uid_len = 64
if prefix is None:
dicom_uid = '2.25.{0}'.format(uuid.uuid1().int)
else:
uid_info = [uuid.getnode(),
fabs(os.getpid()),
datetime.datetime.today().second,
datetime.datetime.today().microsecond]
suffix = ''.join([str(long(x)) for x in uid_info])
dicom_uid = ''.join([prefix, suffix])
if truncate:
dicom_uid = dicom_uid[:max_uid_len]
dicom_uid = UID(dicom_uid)
#This will raise an exception if the UID is invalid
dicom_uid.is_valid()
return dicom_uid
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