_ Git - youtube-dl/blob - youtube_dl/swfinterp.py

   1 from __future__ import unicode_literals
   2
   3 import collections
   4 import io
   5 import zlib
   6
   7 from .utils import (
   8     compat_str,
   9     ExtractorError,
  10     struct_unpack,
  11 )
  12
  13
  14 def _extract_tags(file_contents):
  15     if file_contents[1:3] != b'WS':
  16         raise ExtractorError(
  17             'Not an SWF file; header is %r' % file_contents[:3])
  18     if file_contents[:1] == b'C':
  19         content = zlib.decompress(file_contents[8:])
  20     else:
  21         raise NotImplementedError(
  22             'Unsupported compression format %r' %
  23             file_contents[:1])
  24
  25     # Determine number of bits in framesize rectangle
  26     framesize_nbits = struct_unpack('!B', content[:1])[0] >> 3
  27     framesize_len = (5 + 4 * framesize_nbits + 7) // 8
  28
  29     pos = framesize_len + 2 + 2
  30     while pos < len(content):
  31         header16 = struct_unpack('<H', content[pos:pos + 2])[0]
  32         pos += 2
  33         tag_code = header16 >> 6
  34         tag_len = header16 & 0x3f
  35         if tag_len == 0x3f:
  36             tag_len = struct_unpack('<I', content[pos:pos + 4])[0]
  37             pos += 4
  38         assert pos + tag_len <= len(content), \
  39             ('Tag %d ends at %d+%d - that\'s longer than the file (%d)'
  40                 % (tag_code, pos, tag_len, len(content)))
  41         yield (tag_code, content[pos:pos + tag_len])
  42         pos += tag_len
  43
  44
  45 class _AVMClass_Object(object):
  46     def __init__(self, avm_class):
  47         self.avm_class = avm_class
  48
  49     def __repr__(self):
  50         return '%s#%x' % (self.avm_class.name, id(self))
  51
  52
  53 class _ScopeDict(dict):
  54     def __init__(self, avm_class):
  55         super(_ScopeDict, self).__init__()
  56         self.avm_class = avm_class
  57
  58     def __repr__(self):
  59         return '%s__Scope(%s)' % (
  60             self.avm_class.name,
  61             super(_ScopeDict, self).__repr__())
  62
  63
  64 class _AVMClass(object):
  65     def __init__(self, name_idx, name, static_properties=None):
  66         self.name_idx = name_idx
  67         self.name = name
  68         self.method_names = {}
  69         self.method_idxs = {}
  70         self.methods = {}
  71         self.method_pyfunctions = {}
  72         self.static_properties = static_properties if static_properties else {}
  73
  74         self.variables = _ScopeDict(self)
  75         self.constants = {}
  76
  77     def make_object(self):
  78         return _AVMClass_Object(self)
  79
  80     def __repr__(self):
  81         return '_AVMClass(%s)' % (self.name)
  82
  83     def register_methods(self, methods):
  84         self.method_names.update(methods.items())
  85         self.method_idxs.update(dict(
  86             (idx, name)
  87             for name, idx in methods.items()))
  88
  89
  90 class _Multiname(object):
  91     def __init__(self, kind):
  92         self.kind = kind
  93
  94     def __repr__(self):
  95         return '[MULTINAME kind: 0x%x]' % self.kind
  96
  97
  98 def _read_int(reader):
  99     res = 0
 100     shift = 0
 101     for _ in range(5):
 102         buf = reader.read(1)
 103         assert len(buf) == 1
 104         b = struct_unpack('<B', buf)[0]
 105         res = res | ((b & 0x7f) << shift)
 106         if b & 0x80 == 0:
 107             break
 108         shift += 7
 109     return res
 110
 111
 112 def _u30(reader):
 113     res = _read_int(reader)
 114     assert res & 0xf0000000 == 0
 115     return res
 116 _u32 = _read_int
 117
 118
 119 def _s32(reader):
 120     v = _read_int(reader)
 121     if v & 0x80000000 != 0:
 122         v = - ((v ^ 0xffffffff) + 1)
 123     return v
 124
 125
 126 def _s24(reader):
 127     bs = reader.read(3)
 128     assert len(bs) == 3
 129     last_byte = b'\xff' if (ord(bs[2:3]) >= 0x80) else b'\x00'
 130     return struct_unpack('<i', bs + last_byte)[0]
 131
 132
 133 def _read_string(reader):
 134     slen = _u30(reader)
 135     resb = reader.read(slen)
 136     assert len(resb) == slen
 137     return resb.decode('utf-8')
 138
 139
 140 def _read_bytes(count, reader):
 141     assert count >= 0
 142     resb = reader.read(count)
 143     assert len(resb) == count
 144     return resb
 145
 146
 147 def _read_byte(reader):
 148     resb = _read_bytes(1, reader=reader)
 149     res = struct_unpack('<B', resb)[0]
 150     return res
 151
 152
 153 StringClass = _AVMClass('(no name idx)', 'String')
 154 ByteArrayClass = _AVMClass('(no name idx)', 'ByteArray')
 155 TimerClass = _AVMClass('(no name idx)', 'Timer')
 156 TimerEventClass = _AVMClass('(no name idx)', 'TimerEvent', {'TIMER': 'timer'})
 157 _builtin_classes = {
 158     StringClass.name: StringClass,
 159     ByteArrayClass.name: ByteArrayClass,
 160     TimerClass.name: TimerClass,
 161     TimerEventClass.name: TimerEventClass,
 162 }
 163
 164
 165 class _Undefined(object):
 166     def __bool__(self):
 167         return False
 168     __nonzero__ = __bool__
 169
 170     def __hash__(self):
 171         return 0
 172
 173 undefined = _Undefined()
 174
 175
 176 class SWFInterpreter(object):
 177     def __init__(self, file_contents):
 178         self._patched_functions = {
 179             (TimerClass, 'addEventListener'): lambda params: undefined,
 180         }
 181         code_tag = next(tag
 182                         for tag_code, tag in _extract_tags(file_contents)
 183                         if tag_code == 82)
 184         p = code_tag.index(b'\0', 4) + 1
 185         code_reader = io.BytesIO(code_tag[p:])
 186
 187         # Parse ABC (AVM2 ByteCode)
 188
 189         # Define a couple convenience methods
 190         u30 = lambda *args: _u30(*args, reader=code_reader)
 191         s32 = lambda *args: _s32(*args, reader=code_reader)
 192         u32 = lambda *args: _u32(*args, reader=code_reader)
 193         read_bytes = lambda *args: _read_bytes(*args, reader=code_reader)
 194         read_byte = lambda *args: _read_byte(*args, reader=code_reader)
 195
 196         # minor_version + major_version
 197         read_bytes(2 + 2)
 198
 199         # Constant pool
 200         int_count = u30()
 201         self.constant_ints = [0]
 202         for _c in range(1, int_count):
 203             self.constant_ints.append(s32())
 204         self.constant_uints = [0]
 205         uint_count = u30()
 206         for _c in range(1, uint_count):
 207             self.constant_uints.append(u32())
 208         double_count = u30()
 209         read_bytes(max(0, (double_count - 1)) * 8)
 210         string_count = u30()
 211         self.constant_strings = ['']
 212         for _c in range(1, string_count):
 213             s = _read_string(code_reader)
 214             self.constant_strings.append(s)
 215         namespace_count = u30()
 216         for _c in range(1, namespace_count):
 217             read_bytes(1)  # kind
 218             u30()  # name
 219         ns_set_count = u30()
 220         for _c in range(1, ns_set_count):
 221             count = u30()
 222             for _c2 in range(count):
 223                 u30()
 224         multiname_count = u30()
 225         MULTINAME_SIZES = {
 226             0x07: 2,  # QName
 227             0x0d: 2,  # QNameA
 228             0x0f: 1,  # RTQName
 229             0x10: 1,  # RTQNameA
 230             0x11: 0,  # RTQNameL
 231             0x12: 0,  # RTQNameLA
 232             0x09: 2,  # Multiname
 233             0x0e: 2,  # MultinameA
 234             0x1b: 1,  # MultinameL
 235             0x1c: 1,  # MultinameLA
 236         }
 237         self.multinames = ['']
 238         for _c in range(1, multiname_count):
 239             kind = u30()
 240             assert kind in MULTINAME_SIZES, 'Invalid multiname kind %r' % kind
 241             if kind == 0x07:
 242                 u30()  # namespace_idx
 243                 name_idx = u30()
 244                 self.multinames.append(self.constant_strings[name_idx])
 245             elif kind == 0x09:
 246                 name_idx = u30()
 247                 u30()
 248                 self.multinames.append(self.constant_strings[name_idx])
 249             else:
 250                 self.multinames.append(_Multiname(kind))
 251                 for _c2 in range(MULTINAME_SIZES[kind]):
 252                     u30()
 253
 254         # Methods
 255         method_count = u30()
 256         MethodInfo = collections.namedtuple(
 257             'MethodInfo',
 258             ['NEED_ARGUMENTS', 'NEED_REST'])
 259         method_infos = []
 260         for method_id in range(method_count):
 261             param_count = u30()
 262             u30()  # return type
 263             for _ in range(param_count):
 264                 u30()  # param type
 265             u30()  # name index (always 0 for youtube)
 266             flags = read_byte()
 267             if flags & 0x08 != 0:
 268                 # Options present
 269                 option_count = u30()
 270                 for c in range(option_count):
 271                     u30()  # val
 272                     read_bytes(1)  # kind
 273             if flags & 0x80 != 0:
 274                 # Param names present
 275                 for _ in range(param_count):
 276                     u30()  # param name
 277             mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0)
 278             method_infos.append(mi)
 279
 280         # Metadata
 281         metadata_count = u30()
 282         for _c in range(metadata_count):
 283             u30()  # name
 284             item_count = u30()
 285             for _c2 in range(item_count):
 286                 u30()  # key
 287                 u30()  # value
 288
 289         def parse_traits_info():
 290             trait_name_idx = u30()
 291             kind_full = read_byte()
 292             kind = kind_full & 0x0f
 293             attrs = kind_full >> 4
 294             methods = {}
 295             constants = None
 296             if kind == 0x00:  # Slot
 297                 u30()  # Slot id
 298                 u30()  # type_name_idx
 299                 vindex = u30()
 300                 if vindex != 0:
 301                     read_byte()  # vkind
 302             elif kind == 0x06:  # Const
 303                 u30()  # Slot id
 304                 u30()  # type_name_idx
 305                 vindex = u30()
 306                 vkind = 'any'
 307                 if vindex != 0:
 308                     vkind = read_byte()
 309                 if vkind == 0x03:  # Constant_Int
 310                     value = self.constant_ints[vindex]
 311                 elif vkind == 0x04:  # Constant_UInt
 312                     value = self.constant_uints[vindex]
 313                 else:
 314                     return {}, None  # Ignore silently for now
 315                 constants = {self.multinames[trait_name_idx]: value}
 316             elif kind in (0x01, 0x02, 0x03):  # Method / Getter / Setter
 317                 u30()  # disp_id
 318                 method_idx = u30()
 319                 methods[self.multinames[trait_name_idx]] = method_idx
 320             elif kind == 0x04:  # Class
 321                 u30()  # slot_id
 322                 u30()  # classi
 323             elif kind == 0x05:  # Function
 324                 u30()  # slot_id
 325                 function_idx = u30()
 326                 methods[function_idx] = self.multinames[trait_name_idx]
 327             else:
 328                 raise ExtractorError('Unsupported trait kind %d' % kind)
 329
 330             if attrs & 0x4 != 0:  # Metadata present
 331                 metadata_count = u30()
 332                 for _c3 in range(metadata_count):
 333                     u30()  # metadata index
 334
 335             return methods, constants
 336
 337         # Classes
 338         class_count = u30()
 339         classes = []
 340         for class_id in range(class_count):
 341             name_idx = u30()
 342
 343             cname = self.multinames[name_idx]
 344             avm_class = _AVMClass(name_idx, cname)
 345             classes.append(avm_class)
 346
 347             u30()  # super_name idx
 348             flags = read_byte()
 349             if flags & 0x08 != 0:  # Protected namespace is present
 350                 u30()  # protected_ns_idx
 351             intrf_count = u30()
 352             for _c2 in range(intrf_count):
 353                 u30()
 354             u30()  # iinit
 355             trait_count = u30()
 356             for _c2 in range(trait_count):
 357                 trait_methods, trait_constants = parse_traits_info()
 358                 avm_class.register_methods(trait_methods)
 359                 if trait_constants:
 360                     avm_class.constants.update(trait_constants)
 361
 362         assert len(classes) == class_count
 363         self._classes_by_name = dict((c.name, c) for c in classes)
 364
 365         for avm_class in classes:
 366             avm_class.cinit_idx = u30()
 367             trait_count = u30()
 368             for _c2 in range(trait_count):
 369                 trait_methods, trait_constants = parse_traits_info()
 370                 avm_class.register_methods(trait_methods)
 371                 if trait_constants:
 372                     avm_class.constants.update(trait_constants)
 373
 374         # Scripts
 375         script_count = u30()
 376         for _c in range(script_count):
 377             u30()  # init
 378             trait_count = u30()
 379             for _c2 in range(trait_count):
 380                 parse_traits_info()
 381
 382         # Method bodies
 383         method_body_count = u30()
 384         Method = collections.namedtuple('Method', ['code', 'local_count'])
 385         self._all_methods = []
 386         for _c in range(method_body_count):
 387             method_idx = u30()
 388             u30()  # max_stack
 389             local_count = u30()
 390             u30()  # init_scope_depth
 391             u30()  # max_scope_depth
 392             code_length = u30()
 393             code = read_bytes(code_length)
 394             m = Method(code, local_count)
 395             self._all_methods.append(m)
 396             for avm_class in classes:
 397                 if method_idx in avm_class.method_idxs:
 398                     avm_class.methods[avm_class.method_idxs[method_idx]] = m
 399             exception_count = u30()
 400             for _c2 in range(exception_count):
 401                 u30()  # from
 402                 u30()  # to
 403                 u30()  # target
 404                 u30()  # exc_type
 405                 u30()  # var_name
 406             trait_count = u30()
 407             for _c2 in range(trait_count):
 408                 parse_traits_info()
 409
 410         assert p + code_reader.tell() == len(code_tag)
 411
 412     def patch_function(self, avm_class, func_name, f):
 413         self._patched_functions[(avm_class, func_name)] = f
 414
 415     def extract_class(self, class_name, call_cinit=True):
 416         try:
 417             res = self._classes_by_name[class_name]
 418         except KeyError:
 419             raise ExtractorError('Class %r not found' % class_name)
 420
 421         if call_cinit and hasattr(res, 'cinit_idx'):
 422             res.register_methods({'$cinit': res.cinit_idx})
 423             res.methods['$cinit'] = self._all_methods[res.cinit_idx]
 424             cinit = self.extract_function(res, '$cinit')
 425             cinit([])
 426
 427         return res
 428
 429     def extract_function(self, avm_class, func_name):
 430         p = self._patched_functions.get((avm_class, func_name))
 431         if p:
 432             return p
 433         if func_name in avm_class.method_pyfunctions:
 434             return avm_class.method_pyfunctions[func_name]
 435         if func_name in self._classes_by_name:
 436             return self._classes_by_name[func_name].make_object()
 437         if func_name not in avm_class.methods:
 438             raise ExtractorError('Cannot find function %s.%s' % (
 439                 avm_class.name, func_name))
 440         m = avm_class.methods[func_name]
 441
 442         def resfunc(args):
 443             # Helper functions
 444             coder = io.BytesIO(m.code)
 445             s24 = lambda: _s24(coder)
 446             u30 = lambda: _u30(coder)
 447
 448             registers = [avm_class.variables] + list(args) + [None] * m.local_count
 449             stack = []
 450             scopes = collections.deque([
 451                 self._classes_by_name, avm_class.constants, avm_class.variables])
 452             while True:
 453                 opcode = _read_byte(coder)
 454                 if opcode == 9:  # label
 455                     pass  # Spec says: "Do nothing."
 456                 elif opcode == 16:  # jump
 457                     offset = s24()
 458                     coder.seek(coder.tell() + offset)
 459                 elif opcode == 17:  # iftrue
 460                     offset = s24()
 461                     value = stack.pop()
 462                     if value:
 463                         coder.seek(coder.tell() + offset)
 464                 elif opcode == 18:  # iffalse
 465                     offset = s24()
 466                     value = stack.pop()
 467                     if not value:
 468                         coder.seek(coder.tell() + offset)
 469                 elif opcode == 19:  # ifeq
 470                     offset = s24()
 471                     value2 = stack.pop()
 472                     value1 = stack.pop()
 473                     if value2 == value1:
 474                         coder.seek(coder.tell() + offset)
 475                 elif opcode == 20:  # ifne
 476                     offset = s24()
 477                     value2 = stack.pop()
 478                     value1 = stack.pop()
 479                     if value2 != value1:
 480                         coder.seek(coder.tell() + offset)
 481                 elif opcode == 21:  # iflt
 482                     offset = s24()
 483                     value2 = stack.pop()
 484                     value1 = stack.pop()
 485                     if value1 < value2:
 486                         coder.seek(coder.tell() + offset)
 487                 elif opcode == 32:  # pushnull
 488                     stack.append(None)
 489                 elif opcode == 33:  # pushundefined
 490                     stack.append(undefined)
 491                 elif opcode == 36:  # pushbyte
 492                     v = _read_byte(coder)
 493                     stack.append(v)
 494                 elif opcode == 37:  # pushshort
 495                     v = u30()
 496                     stack.append(v)
 497                 elif opcode == 38:  # pushtrue
 498                     stack.append(True)
 499                 elif opcode == 39:  # pushfalse
 500                     stack.append(False)
 501                 elif opcode == 40:  # pushnan
 502                     stack.append(float('NaN'))
 503                 elif opcode == 42:  # dup
 504                     value = stack[-1]
 505                     stack.append(value)
 506                 elif opcode == 44:  # pushstring
 507                     idx = u30()
 508                     stack.append(self.constant_strings[idx])
 509                 elif opcode == 48:  # pushscope
 510                     new_scope = stack.pop()
 511                     scopes.append(new_scope)
 512                 elif opcode == 66:  # construct
 513                     arg_count = u30()
 514                     args = list(reversed(
 515                         [stack.pop() for _ in range(arg_count)]))
 516                     obj = stack.pop()
 517                     res = obj.avm_class.make_object()
 518                     stack.append(res)
 519                 elif opcode == 70:  # callproperty
 520                     index = u30()
 521                     mname = self.multinames[index]
 522                     arg_count = u30()
 523                     args = list(reversed(
 524                         [stack.pop() for _ in range(arg_count)]))
 525                     obj = stack.pop()
 526
 527                     if obj == StringClass:
 528                         if mname == 'String':
 529                             assert len(args) == 1
 530                             assert isinstance(args[0], (
 531                                 int, compat_str, _Undefined))
 532                             if args[0] == undefined:
 533                                 res = 'undefined'
 534                             else:
 535                                 res = compat_str(args[0])
 536                             stack.append(res)
 537                             continue
 538                         else:
 539                             raise NotImplementedError(
 540                                 'Function String.%s is not yet implemented'
 541                                 % mname)
 542                     elif isinstance(obj, _AVMClass_Object):
 543                         func = self.extract_function(obj.avm_class, mname)
 544                         res = func(args)
 545                         stack.append(res)
 546                         continue
 547                     elif isinstance(obj, _AVMClass):
 548                         func = self.extract_function(obj, mname)
 549                         res = func(args)
 550                         stack.append(res)
 551                         continue
 552                     elif isinstance(obj, _ScopeDict):
 553                         if mname in obj.avm_class.method_names:
 554                             func = self.extract_function(obj.avm_class, mname)
 555                             res = func(args)
 556                         else:
 557                             res = obj[mname]
 558                         stack.append(res)
 559                         continue
 560                     elif isinstance(obj, compat_str):
 561                         if mname == 'split':
 562                             assert len(args) == 1
 563                             assert isinstance(args[0], compat_str)
 564                             if args[0] == '':
 565                                 res = list(obj)
 566                             else:
 567                                 res = obj.split(args[0])
 568                             stack.append(res)
 569                             continue
 570                         elif mname == 'charCodeAt':
 571                             assert len(args) <= 1
 572                             idx = 0 if len(args) == 0 else args[0]
 573                             assert isinstance(idx, int)
 574                             res = ord(obj[idx])
 575                             stack.append(res)
 576                             continue
 577                     elif isinstance(obj, list):
 578                         if mname == 'slice':
 579                             assert len(args) == 1
 580                             assert isinstance(args[0], int)
 581                             res = obj[args[0]:]
 582                             stack.append(res)
 583                             continue
 584                         elif mname == 'join':
 585                             assert len(args) == 1
 586                             assert isinstance(args[0], compat_str)
 587                             res = args[0].join(obj)
 588                             stack.append(res)
 589                             continue
 590                     raise NotImplementedError(
 591                         'Unsupported property %r on %r'
 592                         % (mname, obj))
 593                 elif opcode == 71:  # returnvoid
 594                     res = undefined
 595                     return res
 596                 elif opcode == 72:  # returnvalue
 597                     res = stack.pop()
 598                     return res
 599                 elif opcode == 73:  # constructsuper
 600                     # Not yet implemented, just hope it works without it
 601                     arg_count = u30()
 602                     args = list(reversed(
 603                         [stack.pop() for _ in range(arg_count)]))
 604                     obj = stack.pop()
 605                 elif opcode == 74:  # constructproperty
 606                     index = u30()
 607                     arg_count = u30()
 608                     args = list(reversed(
 609                         [stack.pop() for _ in range(arg_count)]))
 610                     obj = stack.pop()
 611
 612                     mname = self.multinames[index]
 613                     assert isinstance(obj, _AVMClass)
 614
 615                     # We do not actually call the constructor for now;
 616                     # we just pretend it does nothing
 617                     stack.append(obj.make_object())
 618                 elif opcode == 79:  # callpropvoid
 619                     index = u30()
 620                     mname = self.multinames[index]
 621                     arg_count = u30()
 622                     args = list(reversed(
 623                         [stack.pop() for _ in range(arg_count)]))
 624                     obj = stack.pop()
 625                     if isinstance(obj, _AVMClass_Object):
 626                         func = self.extract_function(obj.avm_class, mname)
 627                         res = func(args)
 628                         assert res is undefined
 629                         continue
 630                     if isinstance(obj, _ScopeDict):
 631                         assert mname in obj.avm_class.method_names
 632                         func = self.extract_function(obj.avm_class, mname)
 633                         res = func(args)
 634                         assert res is undefined
 635                         continue
 636                     if mname == 'reverse':
 637                         assert isinstance(obj, list)
 638                         obj.reverse()
 639                     else:
 640                         raise NotImplementedError(
 641                             'Unsupported (void) property %r on %r'
 642                             % (mname, obj))
 643                 elif opcode == 86:  # newarray
 644                     arg_count = u30()
 645                     arr = []
 646                     for i in range(arg_count):
 647                         arr.append(stack.pop())
 648                     arr = arr[::-1]
 649                     stack.append(arr)
 650                 elif opcode == 93:  # findpropstrict
 651                     index = u30()
 652                     mname = self.multinames[index]
 653                     for s in reversed(scopes):
 654                         if mname in s:
 655                             res = s
 656                             break
 657                     else:
 658                         res = scopes[0]
 659                     if mname not in res and mname in _builtin_classes:
 660                         stack.append(_builtin_classes[mname])
 661                     else:
 662                         stack.append(res[mname])
 663                 elif opcode == 94:  # findproperty
 664                     index = u30()
 665                     mname = self.multinames[index]
 666                     for s in reversed(scopes):
 667                         if mname in s:
 668                             res = s
 669                             break
 670                     else:
 671                         res = avm_class.variables
 672                     stack.append(res)
 673                 elif opcode == 96:  # getlex
 674                     index = u30()
 675                     mname = self.multinames[index]
 676                     for s in reversed(scopes):
 677                         if mname in s:
 678                             scope = s
 679                             break
 680                     else:
 681                         scope = avm_class.variables
 682
 683                     if mname in scope:
 684                         res = scope[mname]
 685                     elif mname in _builtin_classes:
 686                         res = _builtin_classes[mname]
 687                     else:
 688                         # Assume unitialized
 689                         res = undefined
 690                     stack.append(res)
 691                 elif opcode == 97:  # setproperty
 692                     index = u30()
 693                     value = stack.pop()
 694                     idx = self.multinames[index]
 695                     if isinstance(idx, _Multiname):
 696                         idx = stack.pop()
 697                     obj = stack.pop()
 698                     obj[idx] = value
 699                 elif opcode == 98:  # getlocal
 700                     index = u30()
 701                     stack.append(registers[index])
 702                 elif opcode == 99:  # setlocal
 703                     index = u30()
 704                     value = stack.pop()
 705                     registers[index] = value
 706                 elif opcode == 102:  # getproperty
 707                     index = u30()
 708                     pname = self.multinames[index]
 709                     if pname == 'length':
 710                         obj = stack.pop()
 711                         assert isinstance(obj, (compat_str, list))
 712                         stack.append(len(obj))
 713                     elif isinstance(pname, compat_str):  # Member access
 714                         obj = stack.pop()
 715                         if isinstance(obj, _AVMClass):
 716                             res = obj.static_properties[pname]
 717                             stack.append(res)
 718                             continue
 719
 720                         assert isinstance(obj, (dict, _ScopeDict)),\
 721                             'Accessing member %r on %r' % (pname, obj)
 722                         res = obj.get(pname, undefined)
 723                         stack.append(res)
 724                     else:  # Assume attribute access
 725                         idx = stack.pop()
 726                         assert isinstance(idx, int)
 727                         obj = stack.pop()
 728                         assert isinstance(obj, list)
 729                         stack.append(obj[idx])
 730                 elif opcode == 104:  # initproperty
 731                     index = u30()
 732                     value = stack.pop()
 733                     idx = self.multinames[index]
 734                     if isinstance(idx, _Multiname):
 735                         idx = stack.pop()
 736                     obj = stack.pop()
 737                     obj[idx] = value
 738                 elif opcode == 115:  # convert_
 739                     value = stack.pop()
 740                     intvalue = int(value)
 741                     stack.append(intvalue)
 742                 elif opcode == 128:  # coerce
 743                     u30()
 744                 elif opcode == 130:  # coerce_a
 745                     value = stack.pop()
 746                     # um, yes, it's any value
 747                     stack.append(value)
 748                 elif opcode == 133:  # coerce_s
 749                     assert isinstance(stack[-1], (type(None), compat_str))
 750                 elif opcode == 147:  # decrement
 751                     value = stack.pop()
 752                     assert isinstance(value, int)
 753                     stack.append(value - 1)
 754                 elif opcode == 149:  # typeof
 755                     value = stack.pop()
 756                     return {
 757                         _Undefined: 'undefined',
 758                         compat_str: 'String',
 759                         int: 'Number',
 760                         float: 'Number',
 761                     }[type(value)]
 762                 elif opcode == 160:  # add
 763                     value2 = stack.pop()
 764                     value1 = stack.pop()
 765                     res = value1 + value2
 766                     stack.append(res)
 767                 elif opcode == 161:  # subtract
 768                     value2 = stack.pop()
 769                     value1 = stack.pop()
 770                     res = value1 - value2
 771                     stack.append(res)
 772                 elif opcode == 162:  # multiply
 773                     value2 = stack.pop()
 774                     value1 = stack.pop()
 775                     res = value1 * value2
 776                     stack.append(res)
 777                 elif opcode == 164:  # modulo
 778                     value2 = stack.pop()
 779                     value1 = stack.pop()
 780                     res = value1 % value2
 781                     stack.append(res)
 782                 elif opcode == 168:  # bitand
 783                     value2 = stack.pop()
 784                     value1 = stack.pop()
 785                     assert isinstance(value1, int)
 786                     assert isinstance(value2, int)
 787                     res = value1 & value2
 788                     stack.append(res)
 789                 elif opcode == 171:  # equals
 790                     value2 = stack.pop()
 791                     value1 = stack.pop()
 792                     result = value1 == value2
 793                     stack.append(result)
 794                 elif opcode == 175:  # greaterequals
 795                     value2 = stack.pop()
 796                     value1 = stack.pop()
 797                     result = value1 >= value2
 798                     stack.append(result)
 799                 elif opcode == 192:  # increment_i
 800                     value = stack.pop()
 801                     assert isinstance(value, int)
 802                     stack.append(value + 1)
 803                 elif opcode == 208:  # getlocal_0
 804                     stack.append(registers[0])
 805                 elif opcode == 209:  # getlocal_1
 806                     stack.append(registers[1])
 807                 elif opcode == 210:  # getlocal_2
 808                     stack.append(registers[2])
 809                 elif opcode == 211:  # getlocal_3
 810                     stack.append(registers[3])
 811                 elif opcode == 212:  # setlocal_0
 812                     registers[0] = stack.pop()
 813                 elif opcode == 213:  # setlocal_1
 814                     registers[1] = stack.pop()
 815                 elif opcode == 214:  # setlocal_2
 816                     registers[2] = stack.pop()
 817                 elif opcode == 215:  # setlocal_3
 818                     registers[3] = stack.pop()
 819                 else:
 820                     raise NotImplementedError(
 821                         'Unsupported opcode %d' % opcode)
 822
 823         avm_class.method_pyfunctions[func_name] = resfunc
 824         return resfunc
 825