Initial commit
This commit is contained in:
Hector Martin
335
pywii/Common/Struct.py
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335
pywii/Common/Struct.py
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import struct, sys
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class StructType(tuple):
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def __getitem__(self, value):
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return [self] * value
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def __call__(self, value, endian='<'):
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if isinstance(value, str):
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return struct.unpack(endian + tuple.__getitem__(self, 0), value[:tuple.__getitem__(self, 1)])[0]
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else:
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return struct.pack(endian + tuple.__getitem__(self, 0), value)
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class StructException(Exception):
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pass
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class Struct(object):
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__slots__ = ('__attrs__', '__baked__', '__defs__', '__endian__', '__next__', '__sizes__', '__values__')
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int8 = StructType(('b', 1))
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uint8 = StructType(('B', 1))
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int16 = StructType(('h', 2))
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uint16 = StructType(('H', 2))
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int32 = StructType(('l', 4))
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uint32 = StructType(('L', 4))
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int64 = StructType(('q', 8))
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uint64 = StructType(('Q', 8))
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float = StructType(('f', 4))
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@classmethod
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def string(cls, len, offset=0, encoding=None, stripNulls=False, value=''):
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return StructType(('string', (len, offset, encoding, stripNulls, value)))
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LE = '<'
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BE = '>'
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__endian__ = '<'
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def __init__(self, func=None, unpack=None, **kwargs):
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self.__defs__ = []
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self.__sizes__ = []
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self.__attrs__ = []
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self.__values__ = {}
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self.__next__ = True
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self.__baked__ = False
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if func == None:
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self.__format__()
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else:
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sys.settrace(self.__trace__)
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func()
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for name in func.func_code.co_varnames:
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value = self.__frame__.f_locals[name]
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self.__setattr__(name, value)
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self.__baked__ = True
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if unpack != None:
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if isinstance(unpack, tuple):
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self.unpack(*unpack)
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else:
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self.unpack(unpack)
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if len(kwargs):
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for name in kwargs:
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self.__values__[name] = kwargs[name]
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def __trace__(self, frame, event, arg):
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self.__frame__ = frame
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sys.settrace(None)
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def __setattr__(self, name, value):
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if name in self.__slots__:
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return object.__setattr__(self, name, value)
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if self.__baked__ == False:
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if not isinstance(value, list):
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value = [value]
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attrname = name
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else:
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attrname = '*' + name
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self.__values__[name] = None
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for sub in value:
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if isinstance(sub, Struct):
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sub = sub.__class__
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try:
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if issubclass(sub, Struct):
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sub = ('struct', sub)
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except TypeError:
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pass
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type_, size = tuple(sub)
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if type_ == 'string':
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self.__defs__.append(Struct.string)
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self.__sizes__.append(size)
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self.__attrs__.append(attrname)
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self.__next__ = True
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if attrname[0] != '*':
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self.__values__[name] = size[3]
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elif self.__values__[name] == None:
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self.__values__[name] = [size[3] for val in value]
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elif type_ == 'struct':
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self.__defs__.append(Struct)
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self.__sizes__.append(size)
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self.__attrs__.append(attrname)
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self.__next__ = True
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if attrname[0] != '*':
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self.__values__[name] = size()
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elif self.__values__[name] == None:
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self.__values__[name] = [size() for val in value]
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else:
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if self.__next__:
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self.__defs__.append('')
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self.__sizes__.append(0)
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self.__attrs__.append([])
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self.__next__ = False
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self.__defs__[-1] += type_
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self.__sizes__[-1] += size
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self.__attrs__[-1].append(attrname)
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if attrname[0] != '*':
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self.__values__[name] = 0
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elif self.__values__[name] == None:
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self.__values__[name] = [0 for val in value]
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else:
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try:
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self.__values__[name] = value
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except KeyError:
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raise AttributeError(name)
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def __getattr__(self, name):
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if self.__baked__ == False:
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return name
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else:
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try:
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return self.__values__[name]
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except KeyError:
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raise AttributeError(name)
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def __len__(self):
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ret = 0
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arraypos, arrayname = None, None
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for i in range(len(self.__defs__)):
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sdef, size, attrs = self.__defs__[i], self.__sizes__[i], self.__attrs__[i]
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if sdef == Struct.string:
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size, offset, encoding, stripNulls, value = size
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if isinstance(size, str):
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size = self.__values__[size] + offset
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elif sdef == Struct:
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if attrs[0] == '*':
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if arrayname != attrs:
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arrayname = attrs
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arraypos = 0
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size = len(self.__values__[attrs[1:]][arraypos])
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size = len(self.__values__[attrs])
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ret += size
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return ret
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def unpack(self, data, pos=0):
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for name in self.__values__:
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if not isinstance(self.__values__[name], Struct):
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self.__values__[name] = None
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elif self.__values__[name].__class__ == list and len(self.__values__[name]) != 0:
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if not isinstance(self.__values__[name][0], Struct):
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self.__values__[name] = None
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arraypos, arrayname = None, None
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for i in range(len(self.__defs__)):
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sdef, size, attrs = self.__defs__[i], self.__sizes__[i], self.__attrs__[i]
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if sdef == Struct.string:
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size, offset, encoding, stripNulls, value = size
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if isinstance(size, str):
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size = self.__values__[size] + offset
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temp = data[pos:pos+size]
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if len(temp) != size:
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raise StructException('Expected %i byte string, got %i' % (size, len(temp)))
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if encoding != None:
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temp = temp.decode(encoding)
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if stripNulls:
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temp = temp.rstrip('\0')
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if attrs[0] == '*':
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name = attrs[1:]
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if self.__values__[name] == None:
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self.__values__[name] = []
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self.__values__[name].append(temp)
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else:
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self.__values__[attrs] = temp
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pos += size
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elif sdef == Struct:
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if attrs[0] == '*':
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if arrayname != attrs:
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arrayname = attrs
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arraypos = 0
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name = attrs[1:]
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self.__values__[attrs][arraypos].unpack(data, pos)
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pos += len(self.__values__[attrs][arraypos])
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arraypos += 1
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else:
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self.__values__[attrs].unpack(data, pos)
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pos += len(self.__values__[attrs])
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else:
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values = struct.unpack(self.__endian__+sdef, data[pos:pos+size])
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pos += size
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j = 0
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for name in attrs:
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if name[0] == '*':
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name = name[1:]
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if self.__values__[name] == None:
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self.__values__[name] = []
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self.__values__[name].append(values[j])
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else:
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self.__values__[name] = values[j]
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j += 1
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return self
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def pack(self):
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arraypos, arrayname = None, None
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ret = ''
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for i in range(len(self.__defs__)):
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sdef, size, attrs = self.__defs__[i], self.__sizes__[i], self.__attrs__[i]
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if sdef == Struct.string:
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size, offset, encoding, stripNulls, value = size
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if isinstance(size, str):
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size = self.__values__[size]+offset
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if attrs[0] == '*':
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if arrayname != attrs:
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arraypos = 0
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arrayname = attrs
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temp = self.__values__[attrs[1:]][arraypos]
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arraypos += 1
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else:
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temp = self.__values__[attrs]
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if encoding != None:
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temp = temp.encode(encoding)
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temp = temp[:size]
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ret += temp + ('\0' * (size - len(temp)))
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elif sdef == Struct:
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if attrs[0] == '*':
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if arrayname != attrs:
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arraypos = 0
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arrayname = attrs
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ret += self.__values__[attrs[1:]][arraypos].pack()
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arraypos += 1
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else:
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ret += self.__values__[attrs].pack()
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else:
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values = []
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for name in attrs:
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if name[0] == '*':
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if arrayname != name:
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arraypos = 0
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arrayname = name
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values.append(self.__values__[name[1:]][arraypos])
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arraypos += 1
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else:
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values.append(self.__values__[name])
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ret += struct.pack(self.__endian__+sdef, *values)
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return ret
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def __getitem__(self, value):
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return [('struct', self.__class__)] * value
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if __name__=='__main__':
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class TestStruct(Struct):
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__endian__ = Struct.LE
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def __format__(self):
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self.foo, self.bar = Struct.uint32, Struct.float
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self.baz = Struct.string(8)
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self.omg = Struct.uint32
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self.wtf = Struct.string(self.omg)
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class HaxStruct(Struct):
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__endian__ = Struct.LE
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def __format__(self):
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self.thing1 = Struct.uint32
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self.thing2 = Struct.uint32
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self.hax = HaxStruct
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test = TestStruct()
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test.unpack('\xEF\xBE\xAD\xDE\x00\x00\x80\x3Fdeadbeef\x04\x00\x00\x00test\xCA\xFE\xBA\xBE\xBE\xBA\xFE\xCA')
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assert test.foo == 0xDEADBEEF
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assert test.bar == 1.0
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assert test.baz == 'deadbeef'
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assert test.omg == 4
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assert test.wtf == 'test'
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assert test.hax.thing1 == 0xBEBAFECA
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assert test.hax.thing2 == 0xCAFEBABE
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print 'Tests successful'
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"""
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@Struct.LE
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def TestStruct():
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foo, bar = Struct.uint32, Struct.float
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baz = Struct.string(8)
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omg = Struct.uint32
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wtf = Struct.string(omg)
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@Struct.LE
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def HaxStruct():
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thing1 = Struct.uint32
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thing2 = Struct.uint32
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hax = HaxStruct()
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test = TestStruct()
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test.foo = 0xCAFEBABE
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test.bar = 0.0
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thing = test.hax.thing1
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test.hax.thing1 = test.hax.thing2
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test.hax.thing2 = thing
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assert test.pack() == '\xBE\xBA\xFE\xCA\0\0\0\0deadbeef\x04\x00\x00\x00test\xBE\xBA\xFE\xCA\xCA\xFE\xBA\xBE'
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"""
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