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BF: endian fixes for streamlines code #473

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Merged
merged 1 commit into from
Aug 8, 2016
Merged

BF: endian fixes for streamlines code #473

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21 changes: 11 additions & 10 deletions nibabel/streamlines/trk.py
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Original file line number Diff line number Diff line change
Expand Up @@ -413,7 +413,8 @@ def save(self, fileobj):
pointing to TRK file (and ready to write from the beginning
of the TRK header data).
"""
header = create_empty_header()
# Enforce little-endian byte order for header
header = create_empty_header().newbyteorder('<')

# Override hdr's fields by those contained in `header`.
for k, v in self.header.items():
Expand Down Expand Up @@ -499,20 +500,20 @@ def save(self, fileobj):
for d in t.data_for_points.values())):
raise DataError("Missing scalars for some points!")

points = np.asarray(t.streamline, dtype=f4_dtype)
scalars = [np.asarray(t.data_for_points[k], dtype=f4_dtype)
points = np.asarray(t.streamline)
scalars = [np.asarray(t.data_for_points[k])
for k in data_for_points_keys]
scalars = np.concatenate([np.ndarray((len(points), 0),
dtype=f4_dtype)
scalars = np.concatenate([np.ndarray((len(points), 0),)
] + scalars, axis=1)
properties = [np.asarray(t.data_for_streamline[k],
dtype=f4_dtype)
properties = [np.asarray(t.data_for_streamline[k])
for k in data_for_streamline_keys]
properties = np.concatenate([np.array([], dtype=f4_dtype)
] + properties)
properties = np.concatenate(
[np.array([])] + properties).astype(f4_dtype)

data = struct.pack(i4_dtype.str[:-1], len(points))
data += np.concatenate([points, scalars], axis=1).tostring()
pts_scalars = np.concatenate(
[points, scalars], axis=1).astype(f4_dtype)
data += pts_scalars.tostring()
data += properties.tostring()
f.write(data)

Expand Down