Require C-contiguous/aligned array for writing (fixes #6)

bob/io/base/__init__.py

 # import Libraries of other lib packages
+import numpy
 import bob.core
 
 # import our own Library
@@ -176,6 +177,9 @@ def save(array, filename, create_directories = False):
   if create_directories:
     create_directories_safe(os.path.dirname(filename))
 
+  # requires data is c-contiguous and aligned, will create a copy otherwise
+  array = numpy.require(array, requirements=('C_CONTIGUOUS', 'ALIGNED'))
+
   return File(filename, 'w').write(array)
 
 # Just to make it homogenous with the C++ API
@@ -204,6 +208,10 @@ def append(array, filename):
   ``position`` : int
     See :py:meth:`File.append`
   """
+
+  # requires data is c-contiguous and aligned, will create a copy otherwise
+  array = numpy.require(array, requirements=('C_CONTIGUOUS', 'ALIGNED'))
+
   return File(filename, 'a').append(array)
 
 def peek(filename):

bob/io/base/test_file.py

@@ -208,6 +208,7 @@ def test_hdf5():
   array_readwrite(".h5", a2)
   array_readwrite('.h5', a3)
   array_readwrite(".h5", a4)
+  array_readwrite('.h5', a3[:,::2,::2,::2]) #test non-contiguous
 
   # arrayset writing tests
   a1 = []
@@ -274,6 +275,7 @@ def test_tensorfile():
   array_readwrite('.tensor', a1)
   array_readwrite(".tensor", a2)
   array_readwrite(".tensor", a3)
+  array_readwrite('.tensor', a3[::2,::2]) #test non-contiguous
 
   # arrayset writing tests
   a1 = []
@@ -302,6 +304,7 @@ def test_csv():
   array_readwrite('.csv', a1, close=True)
   array_readwrite(".csv", a2, close=True)
   array_readwrite('.csv', a3, close=True)
+  array_readwrite('.csv', a3[::2,::2], close=True) #test non-contiguous
 
   # arrayset writing tests
   a1 = []