author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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###################################################################### |
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# This file should be kept compatible with Python 2.3, see PEP 291. # |
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###################################################################### |
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import sys |
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from ctypes import * |
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_array_type = type(c_int * 3) |
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def _other_endian(typ): |
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"""Return the type with the 'other' byte order. Simple types like |
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c_int and so on already have __ctype_be__ and __ctype_le__ |
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attributes which contain the types, for more complicated types |
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only arrays are supported. |
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""" |
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try: |
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return getattr(typ, _OTHER_ENDIAN) |
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except AttributeError: |
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if type(typ) == _array_type: |
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return _other_endian(typ._type_) * typ._length_ |
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raise TypeError("This type does not support other endian: %s" % typ) |
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class _swapped_meta(type(Structure)): |
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def __setattr__(self, attrname, value): |
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if attrname == "_fields_": |
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fields = [] |
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for desc in value: |
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name = desc[0] |
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typ = desc[1] |
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rest = desc[2:] |
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fields.append((name, _other_endian(typ)) + rest) |
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value = fields |
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super(_swapped_meta, self).__setattr__(attrname, value) |
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################################################################ |
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# Note: The Structure metaclass checks for the *presence* (not the |
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# value!) of a _swapped_bytes_ attribute to determine the bit order in |
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# structures containing bit fields. |
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if sys.byteorder == "little": |
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_OTHER_ENDIAN = "__ctype_be__" |
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LittleEndianStructure = Structure |
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class BigEndianStructure(Structure): |
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"""Structure with big endian byte order""" |
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__metaclass__ = _swapped_meta |
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_swappedbytes_ = None |
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elif sys.byteorder == "big": |
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_OTHER_ENDIAN = "__ctype_le__" |
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BigEndianStructure = Structure |
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class LittleEndianStructure(Structure): |
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"""Structure with little endian byte order""" |
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__metaclass__ = _swapped_meta |
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_swappedbytes_ = None |
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else: |
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raise RuntimeError("Invalid byteorder") |