jyapayne/glymur
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Checking for bad wavelet transform while parsing. #195

Browse source 
Being more intelligent about printing in such cases.
This commit is contained in:
John Evans 2014-03-18 12:08:16 -04:00
commit 161833ee5c
3 changed files with 28 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

11
glymur/codestream.py
View file

@ -52,9 +52,9 @@ _PROGRESSION_ORDER_DISPLAY = _keydefaultdict(_factory,
PCRL: 'PCRL',
CPRL: 'CPRL'})
_WAVELET_TRANSFORM_DISPLAY = {
WAVELET_XFORM_9X7_IRREVERSIBLE: '9-7 irreversible',
WAVELET_XFORM_5X3_REVERSIBLE: '5-3 reversible'}
_WAVELET_TRANSFORM_DISPLAY = _keydefaultdict(_factory,
{ WAVELET_XFORM_9X7_IRREVERSIBLE: '9-7 irreversible',
WAVELET_XFORM_5X3_REVERSIBLE: '5-3 reversible'})
# Need a catch-all list of valid markers.
# See table A-1 in ISO/IEC FCD15444-1.
@ -390,6 +390,11 @@ class Codestream(object):
msg = "Invalid progression order in COD segment: {0}."
warnings.warn(msg.format(spcod[0]))
if spcod[8] not in [WAVELET_XFORM_9X7_IRREVERSIBLE,
WAVELET_XFORM_5X3_REVERSIBLE]:
msg = "Invalid wavelet transform in COD segment: {0}."
warnings.warn(msg.format(spcod[8]))
sop = (scod & 2) > 0
eph = (scod & 4) > 0

11
glymur/test/test_codestream.py
View file

@ -51,6 +51,17 @@ class TestCodestreamOpjData(unittest.TestCase):
def tearDown(self):
pass
def test_bad_wavelet_transform(self):
"""Should warn if wavelet transform is bad. Issue129"""
filename = opj_data_file('input/nonregression/edf_c2_10025.jp2')
if sys.hexversion < 0x03000000:
with warnings.catch_warnings():
warnings.simplefilter("ignore")
j = Jp2k(filename)
else:
with self.assertWarns(UserWarning):
j = Jp2k(filename)
def test_invalid_progression_order(self):
"""Should still be able to parse even if prog order is invalid."""
jfile = opj_data_file('input/nonregression/2977.pdf.asan.67.2198.jp2')

9
glymur/test/test_printing.py
View file

@ -653,6 +653,15 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
def tearDown(self):
pass
def test_bad_wavelet_transform(self):
"""Should still be able to print if wavelet xform is bad, issue195"""
filename = opj_data_file('input/nonregression/edf_c2_10025.jp2')
with warnings.catch_warnings():
warnings.simplefilter("ignore")
j = Jp2k(filename)
with patch('sys.stdout', new=StringIO()) as fake_out:
print(j)
def test_invalid_progression_order(self):
"""Should still be able to print even if prog order is invalid."""
jfile = opj_data_file('input/nonregression/2977.pdf.asan.67.2198.jp2')