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# Source Generated with Decompyle++ # File: in.pyc (Python 2.4) from struct import pack, unpack, calcsize class Structure: ''' sublcasses can define commonHdr and/or structure. each of them is an tuple of either two: (fieldName, format) or three: (fieldName, \':\', class) fields. [it can\'t be a dictionary, because order is important] where format specifies how the data in the field will be converted to/from bytes (string) class is the class to use when unpacking \':\' fields. each field can only contain one value (or an array of values for *) i.e. struct.pack(\'Hl\',1,2) is valid, but format specifier \'Hl\' is not (you must use 2 dfferent fields) format specifiers: specifiers from module pack can be used with the same format see struct.__doc__ (pack/unpack is finally called) > [little endian] x [padding byte] c [character] b [signed byte] B [unsigned byte] h [signed short] H [unsigned short] l [signed long] L [unsigned long] i [signed integer] I [unsigned integer] q [signed long long (quad)] Q [unsigned long ong (quad)] s [string (array of chars), must be preceded with length in format specifier, padded with zeros] p [pascal string (includes byte count), must be preceded with length in format specifier, padded with zeros] f [float] d [double] = [native byte ordering, size and alignment] @ [native byte ordering, standard size and alignment] ! [network byte ordering] < [little endian] > [big endian] usual printf like specifiers can be used (if started with %) [not recommeneded, there is no why to unpack this] %08x will output an 8 bytes hex %s will output a string %s\x00 will output a NUL terminated string %d%d will output 2 decimal digits (against the very same specification of Structure) ... some additional format specifiers: : just copy the bytes from the field into the output string (input may be string, other structure, or anything responding to __str__()) (for unpacking, all what\'s left is returned) z same as :, but adds a NUL byte at the end (asciiz) (for unpacking the first NUL byte is used as terminator) [asciiz string] u same as z, but adds two NUL bytes at the end (after padding to an even size with NULs). (same for unpacking) [unicode string] w DCE-RPC/NDR string (it\'s a macro for [ \'<L=(len(field)+1)/2\',\'"\x00\x00\x00\x00\',\'<L=(len(field)+1)/2\',\':\' ] ?-field length of field named \'field\', formated as specified with ? (\'?\' may be \'!H\' for example). The input value overrides the real length ?1*?2 array of elements. Each formated as \'?2\', the number of elements in the array is stored as specified by \'?1\' (?1 is optional, or can also be a constant (number), for unpacking) \'xxxx literal xxxx (field\'s value doesn\'t change the output. quotes must not be closed or escaped) "xxxx literal xxxx (field\'s value doesn\'t change the output. quotes must not be closed or escaped) _ will not pack the field. Accepts a third argument, which is an unpack code. See _Test_UnpackCode for an example ?=packcode will evaluate packcode in the context of the structure, and pack the result as specified by ?. Unpacking is made plain ?&fieldname "Address of field fieldname". For packing it will simply pack the id() of fieldname. Or use 0 if fieldname doesn\'t exists. For unpacking, it\'s used to know weather fieldname has to be unpacked or not, i.e. by adding a & field you turn another field (fieldname) in an optional field. ''' commonHdr = () structure = () debug = 0 def __init__(self, data = None, alignment = 0): if not hasattr(self, 'alignment'): self.alignment = alignment self.fields = { } if data is not None: self.fromString(data) else: self.data = None def setAlignment(self, alignment): self.alignment = alignment def setData(self, data): self.data = data def packField(self, fieldName, format = None): if self.debug: print 'packField( %s | %s )' % (fieldName, format) if format is None: format = self.formatForField(fieldName) if self.fields.has_key(fieldName): ans = self.pack(format, self.fields[fieldName], field = fieldName) else: ans = self.pack(format, None, field = fieldName) if self.debug: print '\tanswer %r' % ans return ans def getData(self): if self.data is not None: return self.data data = '' for field in self.commonHdr + self.structure: try: data += self.packField(field[0], field[1]) except Exception: e = None raise except: None if self.fields.has_key(field[0]) else e if self.alignment: if len(data) % self.alignment: data += '\x00' * self.alignment[:-(len(data) % self.alignment)] len(data) % self.alignment return data def fromString(self, data): for field in self.commonHdr + self.structure: if self.debug: print 'fromString( %s | %s | %r )' % (field[0], field[1], data) size = self.calcUnpackSize(field[1], data, field[0]) dataClassOrCode = str if len(field) > 2: dataClassOrCode = field[2] try: self[field[0]] = self.unpack(field[1], data[:size], dataClassOrCode = dataClassOrCode, field = field[0]) except Exception: e = None e.args += ("When unpacking field '%s | %s | %r[:%d]'" % (field[0], field[1], data, size),) raise except: e size = self.calcPackSize(field[1], self[field[0]], field[0]) if self.alignment and size % self.alignment: size += self.alignment - size % self.alignment data = data[size:] return self def __setitem__(self, key, value): self.fields[key] = value self.data = None def __getitem__(self, key): return self.fields[key] def __delitem__(self, key): del self.fields[key] def __str__(self): return self.getData() def __len__(self): return len(self.getData()) def pack(self, format, data, field = None): if self.debug: print ' pack( %s | %r | %s)' % (format, data, field) if field: addressField = self.findAddressFieldFor(field) if addressField is not None and data is None: return '' if format[:1] == '_': return '' if format[:1] == "'" or format[:1] == '"': return format[1:] two = format.split('&') if len(two) == 2: try: return self.pack(two[0], data) if self.fields.has_key(two[1]) and self[two[1]] is not None: return self.pack(two[0], id(self[two[1]])) else: return self.pack(two[0], 0) two = format.split('=') if len(two) >= 2: try: return self.pack(two[0], data) return self.pack(two[0], eval(two[1], { }, self.fields)) two = format.split('-') if len(two) == 2: try: return self.pack(two[0], data) return self.pack(two[0], self.calcPackFieldSize(two[1])) two = format.split('*') if len(two) == 2: answer = '' for each in data: answer += self.pack(two[1], each) if two[0]: if two[0].isdigit(): if int(two[0]) != len(data): raise Exception, "Array field has a constant size, and it doesn't match the actual value" else: return self.pack(two[0], len(data)) + answer return answer if format[:1] == '%': return format % data if format[:1] == 'z': return str(data) + '\x00' if format[:1] == 'u': if not len(data) & 1 or '\x00': pass return str(data) + '\x00\x00' + '' if format[:1] == 'w': if len(data) == 0: data = '\x00\x00' elif len(data) % 2: data += '\x00' l = pack('<L', len(data) / 2) return '%s\x00\x00\x00\x00%s%s' % (l, l, data) if data is None: raise Exception, 'Trying to pack None' if format[:1] == ':': return str(data) return pack(format, data) def unpack(self, format, data, dataClassOrCode = str, field = None): if self.debug: print ' unpack( %s | %r )' % (format, data) if field: addressField = self.findAddressFieldFor(field) if addressField is not None: if not self[addressField]: return None if format[:1] == '_': if dataClassOrCode != str: return eval(dataClassOrCode, { }, self.fields) if format[:1] == "'" or format[:1] == '"': answer = format[1:] if answer != data: raise Exception, "Unpacked data doesn't match constant value '%r' should be '%r'" % (data, answer) return answer two = format.split('&') if len(two) == 2: return self.unpack(two[0], data) two = format.split('=') if len(two) >= 2: return self.unpack(two[0], data) two = format.split('-') if len(two) == 2: return self.unpack(two[0], data) two = format.split('*') if len(two) == 2: answer = [] sofar = 0 if two[0].isdigit(): number = int(two[0]) elif two[0]: sofar += self.calcUnpackSize(two[0], data) number = self.unpack(two[0], data[:sofar]) else: number = -1 while number and sofar < len(data): nsofar = sofar + self.calcUnpackSize(two[1], data[sofar:]) answer.append(self.unpack(two[1], data[sofar:nsofar], dataClassOrCode)) number -= 1 sofar = nsofar return answer if format[:1] == '%': return format % data if format == 'z': if data[-1] != '\x00': raise Exception, "%s 'z' field is not NUL terminated: %r" % (field, data) return data[:-1] if format == 'u': if data[-2:] != '\x00\x00': raise Exception, "%s 'u' field is not NUL-NUL terminated: %r" % (field, data) return data[:-2] if format == 'w': l = unpack('<L', data[:4])[0] return data[12:12 + l * 2] if format == ':': return dataClassOrCode(data) return unpack(format, data)[0] def calcPackSize(self, format, data, field = None): if field: addressField = self.findAddressFieldFor(field) if addressField is not None: if not self[addressField]: return 0 if format[:1] == '_': return 0 if format[:1] == "'" or format[:1] == '"': return len(format) - 1 two = format.split('&') if len(two) == 2: return self.calcPackSize(two[0], data) two = format.split('=') if len(two) >= 2: return self.calcPackSize(two[0], data) two = format.split('-') if len(two) == 2: return self.calcPackSize(two[0], data) two = format.split('*') if len(two) == 2: answer = 0 if two[0].isdigit(): if int(two[0]) != len(data): raise Exception, "Array field has a constant size, and it doesn't match the actual value" elif two[0]: answer += self.calcPackSize(two[0], len(data)) for each in data: answer += self.calcPackSize(two[1], each) return answer if format[:1] == '%': return len(format % data) if format[:1] == 'z': return len(data) + 1 if format[:1] == 'u': l = len(data) if not l & 1 or 3: pass return l + 2 if format[:1] == 'w': l = len(data) return 12 + l + l % 2 if format[:1] == ':': return len(data) return calcsize(format) def calcUnpackSize(self, format, data, field = None): if self.debug: print ' calcUnpackSize( %s | %s | %r)' % (field, format, data) addressField = self.findAddressFieldFor(field) if addressField is not None: if not self[addressField]: return 0 try: lengthField = self.findLengthFieldFor(field) return self[lengthField] except: pass if format[:1] == '_': return 0 if format[:1] == "'" or format[:1] == '"': return len(format) - 1 two = format.split('&') if len(two) == 2: return self.calcUnpackSize(two[0], data) two = format.split('=') if len(two) >= 2: return self.calcUnpackSize(two[0], data) two = format.split('-') if len(two) == 2: return self.calcUnpackSize(two[0], data) two = format.split('*') if len(two) == 2: answer = 0 if two[0]: if two[0].isdigit(): number = int(two[0]) else: answer += self.calcUnpackSize(two[0], data) number = self.unpack(two[0], data[:answer]) while number: number -= 1 answer += self.calcUnpackSize(two[1], data[answer:]) else: while answer < len(data): answer += self.calcUnpackSize(two[1], data[answer:]) return answer if format[:1] == '%': raise Exception, "Can't guess the size of a printf like specifier for unpacking" if format[:1] == 'z': return data.index('\x00') + 1 if format[:1] == 'u': l = data.index('\x00\x00') if not l & 1 or 3: pass return l + 2 if format[:1] == 'w': l = unpack('<L', data[:4])[0] return 12 + l * 2 if format[:1] == ':': return len(data) return calcsize(format) def calcPackFieldSize(self, fieldName, format = None): if format is None: format = self.formatForField(fieldName) return self.calcPackSize(format, self[fieldName]) def formatForField(self, fieldName): for field in self.commonHdr + self.structure: if field[0] == fieldName: return field[1] continue raise Exception, 'Field %s not found' % fieldName def findAddressFieldFor(self, fieldName): descriptor = '&%s' % fieldName l = len(descriptor) for field in self.commonHdr + self.structure: if field[1][-l:] == descriptor: return field[0] continue def findLengthFieldFor(self, fieldName): descriptor = '-%s' % fieldName l = len(descriptor) for field in self.commonHdr + self.structure: if field[1][-l:] == descriptor: return field[0] continue def zeroValue(self, format): two = format.split('*') if len(two) == 2: if two[0].isdigit(): return (self.zeroValue(two[1]),) * int(two[0]) if not format.find('*') == -1: return () if 's' in format: return '' if format in [ 'z', ':', 'u']: return '' if format == 'w': return '\x00\x00' return 0 def clear(self): for field in self.commonHdr + self.structure: self[field[0]] = self.zeroValue(field[1]) def dump(self, msg, indent = 0): import types ind = ' ' * indent print '\n%s' % msg for i in self.fields.keys(): if isinstance(self[i], Structure): self[i].dump('%s:{' % i, indent = indent + 4) print '}' continue print '%s%s: {%r}' % (ind, i, self[i]) class _StructureTest: alignment = 0 def create(self, data = None): if data is not None: return self.theClass(data, alignment = self.alignment) else: return self.theClass(alignment = self.alignment) def run(self): print print '-' * 70 testName = self.__class__.__name__ print 'starting test: %s.....' % testName a = self.create() self.populate(a) a.dump('packing.....') a_str = str(a) print 'packed: %r' % a_str print 'unpacking.....' b = self.create(a_str) b.dump('unpacked.....') print 'repacking.....' b_str = str(b) if b_str != a_str: print "ERROR: original packed and repacked don't match" print 'packed: %r' % b_str class _Test_simple(_StructureTest): class theClass(Structure): commonHdr = () structure = (('int1', '!L'), ('len1', '!L-z1'), ('arr1', 'B*<L'), ('z1', 'z'), ('u1', 'u'), ('', '"COCA'), ('len2', '!H-:1'), ('', '"COCA'), (':1', ':'), ('int3', '>L'), ('code1', '>L=len(arr1)*2+0x1000')) def populate(self, a): a['default'] = 'hola' a['int1'] = 12593 a['int3'] = 1162101570 a['z1'] = 'hola' a['u1'] = 'hola'.encode('utf_16_le') a[':1'] = ':1234:' a['arr1'] = (305402420, 0x88990077L, 1094795585) class _Test_fixedLength(_Test_simple): def populate(self, a): _Test_simple.populate(self, a) a['len1'] = 1111638594 class _Test_simple_aligned4(_Test_simple): alignment = 4 class _Test_nested(_StructureTest): class theClass(Structure): class _Inner(Structure): structure = (('data', 'z'),) structure = (('nest1', ':', _Inner), ('nest2', ':', _Inner), ('int', '<L')) def populate(self, a): a['nest1'] = _Test_nested.theClass._Inner() a['nest2'] = _Test_nested.theClass._Inner() a['nest1']['data'] = 'hola manola' a['nest2']['data'] = 'chau loco' a['int'] = 305419896 class _Test_Optional(_StructureTest): class theClass(Structure): structure = (('pName', '<L&Name'), ('pList', '<L&List'), ('Name', 'w'), ('List', '<H*<L')) def populate(self, a): a['Name'] = 'Optional test' a['List'] = (1, 2, 3, 4) class _Test_Optional_sparse(_Test_Optional): def populate(self, a): _Test_Optional.populate(self, a) del a['Name'] class _Test_AsciiZArray(_StructureTest): class theClass(Structure): structure = (('head', '<L'), ('array', 'B*z'), ('tail', '<L')) def populate(self, a): a['head'] = 4660 a['tail'] = 43981 a['array'] = ('hola', 'manola', 'te traje') class _Test_UnpackCode(_StructureTest): class theClass(Structure): structure = (('leni', '<L=len(uno)*2'), ('cuchi', '_-uno', 'leni/2'), ('uno', ':'), ('dos', ':')) def populate(self, a): a['uno'] = 'soy un loco!' a['dos'] = 'que haces fiera' if __name__ == '__main__': _Test_simple().run() try: _Test_fixedLength().run() except: print 'cannot repack because length is bogus' _Test_simple_aligned4().run() _Test_nested().run() _Test_Optional().run() _Test_Optional_sparse().run() _Test_AsciiZArray().run() _Test_UnpackCode().run()