Test TransferSyntax, fix zipped reading.

Author: kastman

nibabel/nifti1.py

@@ -426,7 +426,7 @@ def _check_meta(self):
             is_implicit_VR = False
             is_little_endian = False
         elif transfer_syntax == dicom.UID.DeflatedExplicitVRLittleEndian:
-            zipped = fileobj.read()
+            zipped = self._bio.read()
             unzipped = zlib.decompress(zipped, -zlib.MAX_WBITS)
             self._bio = BytesIO(unzipped)  # a file-like object
             is_implicit_VR = False
@@ -483,6 +483,7 @@ def _mangle(self, value):
     from dicom.filebase import DicomFileLike
     from dicom.values import converters as dicom_converters
     import dicom.UID
+    import zlib
     from io import BytesIO
 except ImportError:
     """Fall back to standard reader if pydicom unavailable."""

nibabel/tests/data/0_DeflatedExplicitVRLittleEndian.dcm

@@ -1144,6 +1144,18 @@ def test_nifti_dicom_extension():
 
     dcmext.write_to(BytesIO(),False)
 
+    dicomtestfiles=[
+        ('data/0_ExplicitVRBigEndian.dcm',dicom.UID.ExplicitVRBigEndian),
+        ('data/0_ExplicitVRLittleEndian.dcm',dicom.UID.ExplicitVRLittleEndian),
+        ('data/0_DeflatedExplicitVRLittleEndian.dcm',dicom.UID.DeflatedExplicitVRLittleEndian)]
+    for fname,encoding in dicomtestfiles:
+        with open(fname,'rb') as dim:
+            dcmbytes_full = dim.read()
+        dcmext = Nifti1DicomExtension(2,dcmbytes_full)
+        assert_equal(dcmext.get_content().PatientID, 'NiPy')
+        assert_equal(dcmext.get_content().file_meta.TransferSyntaxUID,encoding)
+
+
 class TestNifti1General(object):
     """ Test class to test nifti1 in general