Class DapUnpacker

object --+
         |
        DapUnpacker

A XDR data unpacker.

>>> from dap.dtypes import *
>>> dapvar = BaseType(data=1, name='dapvar', type='Byte')
>>> print dapvar.data
1
>>> from dap.server import SimpleHandler
>>> from dap.helper import escape_dods
>>> dataset = DatasetType(name='test')
>>> dataset['dapvar'] = dapvar
>>> headers, output = SimpleHandler(dataset).dods()
>>> print escape_dods(''.join(output), pad='')
Dataset {
    Byte dapvar;
} test;
Data:
\x01\x00\x00\x00
>>> headers, output = SimpleHandler(dataset).dods()
>>> xdrdata = ''.join(output)
>>> start = xdrdata.index('Data:\n') + len('Data:\n')
>>> xdrdata = xdrdata[start:]
>>> data = DapUnpacker(xdrdata, (), dapvar.type)
>>> print data.getvalue()
1

>>> dapvar = ArrayType(name='dapvar', data=range(5), shape=[5], type='Byte')
>>> dataset['dapvar'] = dapvar
>>> headers, output = SimpleHandler(dataset).dods()
>>> xdrdata = ''.join(output)
>>> start = xdrdata.index('Data:\n') + len('Data:\n')
>>> xdrdata = xdrdata[start:]
>>> data = DapUnpacker(xdrdata, dapvar.shape, dapvar.type, outshape=[5])
>>> print data.getvalue()
[0 1 2 3 4]

>>> dapvar = ArrayType(name='dapvar', data=range(25), shape=[5,5], type='Float32')
>>> dataset['dapvar'] = dapvar
>>> headers, output = SimpleHandler(dataset).dods()
>>> xdrdata = ''.join(output)
>>> start = xdrdata.index('Data:\n') + len('Data:\n')
>>> xdrdata = xdrdata[start:]
>>> data = DapUnpacker(xdrdata, dapvar.shape, dapvar.type, outshape=[5,5])
>>> print data.getvalue()
[[  0.   1.   2.   3.   4.]
 [  5.   6.   7.   8.   9.]
 [ 10.  11.  12.  13.  14.]
 [ 15.  16.  17.  18.  19.]
 [ 20.  21.  22.  23.  24.]]

>>> dapvar = ArrayType(name='dapvar', data=['um', 'dois', 'três'], shape=[3], type='String')
>>> dataset['dapvar'] = dapvar
>>> headers, output = SimpleHandler(dataset).dods()
>>> for line in output:
...     print repr(line)
'Dataset {\n'
'    String dapvar[dapvar = 3];\n'
'} test;\n'
'Data:\n'
'\x00\x00\x00\x03'
'\x00\x00\x00\x02um\x00\x00'
'\x00\x00\x00\x04dois'
'\x00\x00\x00\x05tr\xc3\xaas\x00\x00\x00'
>>> headers, output = SimpleHandler(dataset).dods()
>>> xdrdata = ''.join(output)
>>> start = xdrdata.index('Data:\n') + len('Data:\n')
>>> xdrdata = xdrdata[start:]
>>> data = DapUnpacker(xdrdata, dapvar.shape, dapvar.type, outshape=[3])
>>> print data.getvalue()
[um dois três]