/usr/share/pyshared/dicom/charset.py is in python-dicom 0.9.6-1.
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 | # charset.py
"""Handle alternate character sets for character strings."""
#
# 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 logging
logger = logging.getLogger('pydicom')
# Map DICOM Specific Character Set to python equivalent
python_encoding = {
'': 'iso8859', # default character set for DICOM
'ISO_IR 6': 'iso8859', # alias for latin_1 too
'ISO_IR 100': 'latin_1',
'ISO 2022 IR 87': 'iso2022_jp',
'ISO 2022 IR 13': 'iso2022_jp', #XXX this mapping does not work on chrH32.dcm test files (but no others do either)
'ISO 2022 IR 149': 'euc_kr', # XXX chrI2.dcm -- does not quite work -- some chrs wrong. Need iso_ir_149 python encoding
'ISO_IR 192': 'UTF8', # from Chinese example, 2008 PS3.5 Annex J p1-4
'GB18030': 'GB18030',
'ISO_IR 126': 'iso_ir_126', # Greek
'ISO_IR 127': 'iso_ir_127', # Arab
'ISO_IR 138': 'iso_ir_138', # Hebrew
'ISO_IR 144': 'iso_ir_144', # Russian
}
from dicom.valuerep import PersonNameUnicode, PersonName
# PS3.5-2008 6.1.1 (p 18) says:
# default is ISO-IR 6 G0, equiv to common chr set of ISO 8859 (PS3.5 6.1.2.1)
# (0008,0005) value 1 can *replace* the default encoding...
# for VRs of SH, LO, ST, LT, PN and UT (PS3.5 6.1.2.3)...
# with a single-byte character encoding
# if (0008,0005) is multi-valued, then value 1 (or default if blank)...
# is used until code extension escape sequence is hit,
# which can be at start of string, or after CR/LF, FF, or
# in Person Name PN, after ^ or =
# NOTE also that 7.5.3 SEQUENCE INHERITANCE states that if (0008,0005)
# is not present in a sequence item then it is inherited from its parent.
def decode(data_element, dicom_character_set):
"""Apply the DICOM character encoding to the data element
data_element -- DataElement instance containing a value to convert
dicom_character_set -- the value of Specific Character Set (0008,0005),
which may be a single value,
a multiple value (code extension), or
may also be '' or None.
If blank or None, ISO_IR 6 is used.
"""
if not dicom_character_set:
dicom_character_set = ['ISO_IR 6']
have_character_set_list = True
try:
dicom_character_set.append # check if is list-like object
except AttributeError:
have_character_set_list = False
if have_character_set_list:
if not dicom_character_set[0]:
dicom_character_set[0] = "ISO_IR 6"
else:
dicom_character_set = [dicom_character_set]
# decode the string value to unicode
# PN is special case as may have 3 components with differenct chr sets
if data_element.VR == "PN":
# logger.warn("%s ... type: %s" %(str(data_element), type(data_element.VR)))
encodings = [python_encoding[x] for x in dicom_character_set]
if len(encodings) == 1:
encodings = [encodings[0]]*3
if len(encodings) == 2:
encodings.append(encodings[1])
if data_element.VM == 1:
data_element.value = PersonNameUnicode(data_element.value, encodings)
else:
data_element.value = [PersonNameUnicode(value, encodings)
for value in data_element.value]
if data_element.VR in ['SH', 'LO', 'ST', 'LT', 'UT']:
if data_element.VM == 1:
data_element.value = data_element.value.decode(
python_encoding[dicom_character_set[0]])
else:
data_element.value = [value.decode(
python_encoding[dicom_character_set[0]])
for value in data_element.value]
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