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[youtube] Move swfinterp into its own file

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This commit is contained in:
Philipp Hagemeister 2014-07-18 10:24:28 +02:00
parent 5dc3552d85
commit 5425626790
3 changed files with 516 additions and 453 deletions
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12
test/test_youtube_signature.py
View File

@ -45,6 +45,12 @@ _TESTS = [
u'2ACFC7A61CA478CD21425E5A57EBD73DDC78E22A.2094302436B2D377D14A3BBA23022D023B8BC25AA',
u'A52CB8B320D22032ABB3A41D773D2B6342034902.A22E87CDD37DBE75A5E52412DC874AC16A7CFCA2',
),
(
u'http://s.ytimg.com/yts/swfbin/player-vfl5vIhK2/watch_as3.swf',
u'swf',
86,
u'23456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!?#$%&\'()*+,-./:;<=>"'
),
]
@ -57,12 +63,12 @@ class TestSignature(unittest.TestCase):
def make_tfunc(url, stype, sig_input, expected_sig):
basename = url.rpartition('/')[2]
m = re.match(r'.*-([a-zA-Z0-9_-]+)\.[a-z]+$', basename)
assert m, '%r should follow URL format' % basename
m = re.match(r'.*-([a-zA-Z0-9_-]+)(?:/watch_as3)?\.[a-z]+$', url)
assert m, '%r should follow URL format' % url
test_id = m.group(1)
def test_func(self):
basename = 'player-%s.%s' % (test_id, stype)
fn = os.path.join(self.TESTDATA_DIR, basename)
if not os.path.exists(fn):

454
youtube_dl/extractor/youtube.py
View File

@ -14,6 +14,7 @@ import zlib
from .common import InfoExtractor, SearchInfoExtractor
from .subtitles import SubtitlesInfoExtractor
from ..jsinterp import JSInterpreter
from ..swfinterp import SWFInterpreter
from ..utils import (
compat_chr,
compat_parse_qs,
@ -450,457 +451,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
return lambda s: initial_function([s])
def _parse_sig_swf(self, file_contents):
if file_contents[1:3] != b'WS':
raise ExtractorError(
u'Not an SWF file; header is %r' % file_contents[:3])
if file_contents[:1] == b'C':
content = zlib.decompress(file_contents[8:])
else:
raise NotImplementedError(u'Unsupported compression format %r' %
file_contents[:1])
def extract_tags(content):
pos = 0
while pos < len(content):
header16 = struct.unpack('<H', content[pos:pos+2])[0]
pos += 2
tag_code = header16 >> 6
tag_len = header16 & 0x3f
if tag_len == 0x3f:
tag_len = struct.unpack('<I', content[pos:pos+4])[0]
pos += 4
assert pos+tag_len <= len(content)
yield (tag_code, content[pos:pos+tag_len])
pos += tag_len
code_tag = next(tag
for tag_code, tag in extract_tags(content)
if tag_code == 82)
p = code_tag.index(b'\0', 4) + 1
code_reader = io.BytesIO(code_tag[p:])
# Parse ABC (AVM2 ByteCode)
def read_int(reader=None):
if reader is None:
reader = code_reader
res = 0
shift = 0
for _ in range(5):
buf = reader.read(1)
assert len(buf) == 1
b = struct.unpack('<B', buf)[0]
res = res | ((b & 0x7f) << shift)
if b & 0x80 == 0:
break
shift += 7
return res
def u30(reader=None):
res = read_int(reader)
assert res & 0xf0000000 == 0
return res
u32 = read_int
def s32(reader=None):
v = read_int(reader)
if v & 0x80000000 != 0:
v = - ((v ^ 0xffffffff) + 1)
return v
def s24(reader):
bs = reader.read(3)
assert len(bs) == 3
first_byte = b'\xff' if (ord(bs[0:1]) >= 0x80) else b'\x00'
return struct.unpack('!i', first_byte + bs)
def read_string(reader=None):
if reader is None:
reader = code_reader
slen = u30(reader)
resb = reader.read(slen)
assert len(resb) == slen
return resb.decode('utf-8')
def read_bytes(count, reader=None):
if reader is None:
reader = code_reader
resb = reader.read(count)
assert len(resb) == count
return resb
def read_byte(reader=None):
resb = read_bytes(1, reader=reader)
res = struct.unpack('<B', resb)[0]
return res
# minor_version + major_version
read_bytes(2 + 2)
# Constant pool
int_count = u30()
for _c in range(1, int_count):
s32()
uint_count = u30()
for _c in range(1, uint_count):
u32()
double_count = u30()
read_bytes((double_count-1) * 8)
string_count = u30()
constant_strings = [u'']
for _c in range(1, string_count):
s = read_string()
constant_strings.append(s)
namespace_count = u30()
for _c in range(1, namespace_count):
read_bytes(1) # kind
u30() # name
ns_set_count = u30()
for _c in range(1, ns_set_count):
count = u30()
for _c2 in range(count):
u30()
multiname_count = u30()
MULTINAME_SIZES = {
0x07: 2, # QName
0x0d: 2, # QNameA
0x0f: 1, # RTQName
0x10: 1, # RTQNameA
0x11: 0, # RTQNameL
0x12: 0, # RTQNameLA
0x09: 2, # Multiname
0x0e: 2, # MultinameA
0x1b: 1, # MultinameL
0x1c: 1, # MultinameLA
}
multinames = [u'']
for _c in range(1, multiname_count):
kind = u30()
assert kind in MULTINAME_SIZES, u'Invalid multiname kind %r' % kind
if kind == 0x07:
u30() # namespace_idx
name_idx = u30()
multinames.append(constant_strings[name_idx])
else:
multinames.append('[MULTINAME kind: %d]' % kind)
for _c2 in range(MULTINAME_SIZES[kind]):
u30()
# Methods
method_count = u30()
MethodInfo = collections.namedtuple(
'MethodInfo',
['NEED_ARGUMENTS', 'NEED_REST'])
method_infos = []
for method_id in range(method_count):
param_count = u30()
u30() # return type
for _ in range(param_count):
u30() # param type
u30() # name index (always 0 for youtube)
flags = read_byte()
if flags & 0x08 != 0:
# Options present
option_count = u30()
for c in range(option_count):
u30() # val
read_bytes(1) # kind
if flags & 0x80 != 0:
# Param names present
for _ in range(param_count):
u30() # param name
mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0)
method_infos.append(mi)
# Metadata
metadata_count = u30()
for _c in range(metadata_count):
u30() # name
item_count = u30()
for _c2 in range(item_count):
u30() # key
u30() # value
def parse_traits_info():
trait_name_idx = u30()
kind_full = read_byte()
kind = kind_full & 0x0f
attrs = kind_full >> 4
methods = {}
if kind in [0x00, 0x06]: # Slot or Const
u30() # Slot id
u30() # type_name_idx
vindex = u30()
if vindex != 0:
read_byte() # vkind
elif kind in [0x01, 0x02, 0x03]: # Method / Getter / Setter
u30() # disp_id
method_idx = u30()
methods[multinames[trait_name_idx]] = method_idx
elif kind == 0x04: # Class
u30() # slot_id
u30() # classi
elif kind == 0x05: # Function
u30() # slot_id
function_idx = u30()
methods[function_idx] = multinames[trait_name_idx]
else:
raise ExtractorError(u'Unsupported trait kind %d' % kind)
if attrs & 0x4 != 0: # Metadata present
metadata_count = u30()
for _c3 in range(metadata_count):
u30() # metadata index
return methods
class AVMClass(object):
def __init__(self, name_idx):
self.name_idx = name_idx
self.method_names = {}
self.method_idxs = {}
self.methods = {}
self.method_pyfunctions = {}
self.variables = {}
@property
def name(self):
return multinames[self.name_idx]
# Classes
class_count = u30()
classes = []
for class_id in range(class_count):
name_idx = u30()
classes.append(AVMClass(name_idx))
u30() # super_name idx
flags = read_byte()
if flags & 0x08 != 0: # Protected namespace is present
u30() # protected_ns_idx
intrf_count = u30()
for _c2 in range(intrf_count):
u30()
u30() # iinit
trait_count = u30()
for _c2 in range(trait_count):
parse_traits_info()
assert len(classes) == class_count
swfi = SWFInterpreter(file_contents)
TARGET_CLASSNAME = u'SignatureDecipher'
searched_class = next(
c for c in classes if c.name == TARGET_CLASSNAME)
if searched_class is None:
raise ExtractorError(u'Target class %r not found' %
TARGET_CLASSNAME)
for avm_class in classes:
u30() # cinit
trait_count = u30()
for _c2 in range(trait_count):
trait_methods = parse_traits_info()
avm_class.method_names.update(trait_methods.items())
avm_class.method_idxs.update(dict(
(idx, name)
for name, idx in trait_methods.items()))
# Scripts
script_count = u30()
for _c in range(script_count):
u30() # init
trait_count = u30()
for _c2 in range(trait_count):
parse_traits_info()
# Method bodies
method_body_count = u30()
Method = collections.namedtuple('Method', ['code', 'local_count'])
for _c in range(method_body_count):
method_idx = u30()
u30() # max_stack
local_count = u30()
u30() # init_scope_depth
u30() # max_scope_depth
code_length = u30()
code = read_bytes(code_length)
for avm_class in classes:
if method_idx in avm_class.method_idxs:
m = Method(code, local_count)
avm_class.methods[avm_class.method_idxs[method_idx]] = m
exception_count = u30()
for _c2 in range(exception_count):
u30() # from
u30() # to
u30() # target
u30() # exc_type
u30() # var_name
trait_count = u30()
for _c2 in range(trait_count):
parse_traits_info()
assert p + code_reader.tell() == len(code_tag)
def extract_function(avm_class, func_name):
if func_name in avm_class.method_pyfunctions:
return avm_class.method_pyfunctions[func_name]
if func_name not in avm_class.methods:
raise ExtractorError(u'Cannot find function %r' % func_name)
m = avm_class.methods[func_name]
def resfunc(args):
registers = ['(this)'] + list(args) + [None] * m.local_count
stack = []
coder = io.BytesIO(m.code)
while True:
opcode = struct.unpack('!B', coder.read(1))[0]
if opcode == 17: # iftrue
offset = s24(coder)
value = stack.pop()
if value:
coder.seek(coder.tell() + offset)
elif opcode == 36: # pushbyte
v = struct.unpack('!B', coder.read(1))[0]
stack.append(v)
elif opcode == 44: # pushstring
idx = u30(coder)
stack.append(constant_strings[idx])
elif opcode == 48: # pushscope
# We don't implement the scope register, so we'll just
# ignore the popped value
stack.pop()
elif opcode == 70: # callproperty
index = u30(coder)
mname = multinames[index]
arg_count = u30(coder)
args = list(reversed(
[stack.pop() for _ in range(arg_count)]))
obj = stack.pop()
if mname == u'split':
assert len(args) == 1
assert isinstance(args[0], compat_str)
assert isinstance(obj, compat_str)
if args[0] == u'':
res = list(obj)
else:
res = obj.split(args[0])
stack.append(res)
elif mname == u'slice':
assert len(args) == 1
assert isinstance(args[0], int)
assert isinstance(obj, list)
res = obj[args[0]:]
stack.append(res)
elif mname == u'join':
assert len(args) == 1
assert isinstance(args[0], compat_str)
assert isinstance(obj, list)
res = args[0].join(obj)
stack.append(res)
elif mname in avm_class.method_pyfunctions:
stack.append(avm_class.method_pyfunctions[mname](args))
else:
raise NotImplementedError(
u'Unsupported property %r on %r'
% (mname, obj))
elif opcode == 72: # returnvalue
res = stack.pop()
return res
elif opcode == 79: # callpropvoid
index = u30(coder)
mname = multinames[index]
arg_count = u30(coder)
args = list(reversed(
[stack.pop() for _ in range(arg_count)]))
obj = stack.pop()
if mname == u'reverse':
assert isinstance(obj, list)
obj.reverse()
else:
raise NotImplementedError(
u'Unsupported (void) property %r on %r'
% (mname, obj))
elif opcode == 86: # newarray
arg_count = u30(coder)
arr = []
for i in range(arg_count):
arr.append(stack.pop())
arr = arr[::-1]
stack.append(arr)
elif opcode == 93: # findpropstrict
index = u30(coder)
mname = multinames[index]
res = extract_function(avm_class, mname)
stack.append(res)
elif opcode == 94: # findproperty
index = u30(coder)
mname = multinames[index]
res = avm_class.variables.get(mname)
stack.append(res)
elif opcode == 96: # getlex
index = u30(coder)
mname = multinames[index]
res = avm_class.variables.get(mname)
stack.append(res)
elif opcode == 97: # setproperty
index = u30(coder)
value = stack.pop()
idx = stack.pop()
obj = stack.pop()
assert isinstance(obj, list)
assert isinstance(idx, int)
obj[idx] = value
elif opcode == 98: # getlocal
index = u30(coder)
stack.append(registers[index])
elif opcode == 99: # setlocal
index = u30(coder)
value = stack.pop()
registers[index] = value
elif opcode == 102: # getproperty
index = u30(coder)
pname = multinames[index]
if pname == u'length':
obj = stack.pop()
assert isinstance(obj, list)
stack.append(len(obj))
else: # Assume attribute access
idx = stack.pop()
assert isinstance(idx, int)
obj = stack.pop()
assert isinstance(obj, list)
stack.append(obj[idx])
elif opcode == 128: # coerce
u30(coder)
elif opcode == 133: # coerce_s
assert isinstance(stack[-1], (type(None), compat_str))
elif opcode == 164: # modulo
value2 = stack.pop()
value1 = stack.pop()
res = value1 % value2
stack.append(res)
elif opcode == 175: # greaterequals
value2 = stack.pop()
value1 = stack.pop()
result = value1 >= value2
stack.append(result)
elif opcode == 208: # getlocal_0
stack.append(registers[0])
elif opcode == 209: # getlocal_1
stack.append(registers[1])
elif opcode == 210: # getlocal_2
stack.append(registers[2])
elif opcode == 211: # getlocal_3
stack.append(registers[3])
elif opcode == 214: # setlocal_2
registers[2] = stack.pop()
elif opcode == 215: # setlocal_3
registers[3] = stack.pop()
else:
raise NotImplementedError(
u'Unsupported opcode %d' % opcode)
avm_class.method_pyfunctions[func_name] = resfunc
return resfunc
initial_function = extract_function(searched_class, u'decipher')
searched_class = swfi.extract_class(TARGET_CLASSNAME)
initial_function = swfi.extract_function(searched_class, u'decipher')
return lambda s: initial_function([s])
def _decrypt_signature(self, s, video_id, player_url, age_gate=False):

503
youtube_dl/swfinterp.py Normal file
View File

@ -0,0 +1,503 @@
from __future__ import unicode_literals
import collections
import io
import struct
import zlib
from .utils import ExtractorError
def _extract_tags(content):
pos = 0
while pos < len(content):
header16 = struct.unpack('<H', content[pos:pos + 2])[0]
pos += 2
tag_code = header16 >> 6
tag_len = header16 & 0x3f
if tag_len == 0x3f:
tag_len = struct.unpack('<I', content[pos:pos + 4])[0]
pos += 4
assert pos + tag_len <= len(content)
yield (tag_code, content[pos:pos + tag_len])
pos += tag_len
class _AVMClass_Object(object):
def __init__(self, avm_class):
self.avm_class = avm_class
def __repr__(self):
return '%s#%x' % (self.avm_class.name, id(self))
class _AVMClass(object):
def __init__(self, name_idx, name):
self.name_idx = name_idx
self.name = name
self.method_names = {}
self.method_idxs = {}
self.methods = {}
self.method_pyfunctions = {}
self.variables = {}
def make_object(self):
return _AVMClass_Object(self)
def _read_int(reader):
res = 0
shift = 0
for _ in range(5):
buf = reader.read(1)
assert len(buf) == 1
b = struct.unpack('<B', buf)[0]
res = res | ((b & 0x7f) << shift)
if b & 0x80 == 0:
break
shift += 7
return res
def _u30(reader):
res = _read_int(reader)
assert res & 0xf0000000 == 0
return res
u32 = _read_int
def _s32(reader):
v = _read_int(reader)
if v & 0x80000000 != 0:
v = - ((v ^ 0xffffffff) + 1)
return v
def _s24(reader):
bs = reader.read(3)
assert len(bs) == 3
first_byte = b'\xff' if (ord(bs[0:1]) >= 0x80) else b'\x00'
return struct.unpack('!i', first_byte + bs)
def _read_string(reader):
slen = _u30(reader)
resb = reader.read(slen)
assert len(resb) == slen
return resb.decode('utf-8')
def _read_bytes(count, reader):
if reader is None:
reader = code_reader
resb = reader.read(count)
assert len(resb) == count
return resb
def _read_byte(reader):
resb = _read_bytes(1, reader=reader)
res = struct.unpack('<B', resb)[0]
return res
class SWFInterpreter(object):
def __init__(self, file_contents):
if file_contents[1:3] != b'WS':
raise ExtractorError(
'Not an SWF file; header is %r' % file_contents[:3])
if file_contents[:1] == b'C':
content = zlib.decompress(file_contents[8:])
else:
raise NotImplementedError(
'Unsupported compression format %r' %
file_contents[:1])
code_tag = next(tag
for tag_code, tag in _extract_tags(content)
if tag_code == 82)
p = code_tag.index(b'\0', 4) + 1
code_reader = io.BytesIO(code_tag[p:])
# Parse ABC (AVM2 ByteCode)
# Define a couple convenience methods
u30 = lambda *args: _u30(*args, reader=code_reader)
s32 = lambda *args: _s32(*args, reader=code_reader)
u32 = lambda *args: _u32(*args, reader=code_reader)
read_bytes = lambda *args: _read_bytes(*args, reader=code_reader)
read_byte = lambda *args: _read_byte(*args, reader=code_reader)
# minor_version + major_version
read_bytes(2 + 2)
# Constant pool
int_count = u30()
for _c in range(1, int_count):
s32()
uint_count = u30()
for _c in range(1, uint_count):
u32()
double_count = u30()
read_bytes((double_count - 1) * 8)
string_count = u30()
constant_strings = ['']
for _c in range(1, string_count):
s = _read_string(code_reader)
constant_strings.append(s)
namespace_count = u30()
for _c in range(1, namespace_count):
read_bytes(1) # kind
u30() # name
ns_set_count = u30()
for _c in range(1, ns_set_count):
count = u30()
for _c2 in range(count):
u30()
multiname_count = u30()
MULTINAME_SIZES = {
0x07: 2, # QName
0x0d: 2, # QNameA
0x0f: 1, # RTQName
0x10: 1, # RTQNameA
0x11: 0, # RTQNameL
0x12: 0, # RTQNameLA
0x09: 2, # Multiname
0x0e: 2, # MultinameA
0x1b: 1, # MultinameL
0x1c: 1, # MultinameLA
}
self.multinames = ['']
for _c in range(1, multiname_count):
kind = u30()
assert kind in MULTINAME_SIZES, 'Invalid multiname kind %r' % kind
if kind == 0x07:
u30() # namespace_idx
name_idx = u30()
self.multinames.append(constant_strings[name_idx])
else:
self.multinames.append('[MULTINAME kind: %d]' % kind)
for _c2 in range(MULTINAME_SIZES[kind]):
u30()
# Methods
method_count = u30()
MethodInfo = collections.namedtuple(
'MethodInfo',
['NEED_ARGUMENTS', 'NEED_REST'])
method_infos = []
for method_id in range(method_count):
param_count = u30()
u30() # return type
for _ in range(param_count):
u30() # param type
u30() # name index (always 0 for youtube)
flags = read_byte()
if flags & 0x08 != 0:
# Options present
option_count = u30()
for c in range(option_count):
u30() # val
read_bytes(1) # kind
if flags & 0x80 != 0:
# Param names present
for _ in range(param_count):
u30() # param name
mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0)
method_infos.append(mi)
# Metadata
metadata_count = u30()
for _c in range(metadata_count):
u30() # name
item_count = u30()
for _c2 in range(item_count):
u30() # key
u30() # value
def parse_traits_info():
trait_name_idx = u30()
kind_full = read_byte()
kind = kind_full & 0x0f
attrs = kind_full >> 4
methods = {}
if kind in [0x00, 0x06]: # Slot or Const
u30() # Slot id
u30() # type_name_idx
vindex = u30()
if vindex != 0:
read_byte() # vkind
elif kind in [0x01, 0x02, 0x03]: # Method / Getter / Setter
u30() # disp_id
method_idx = u30()
methods[self.multinames[trait_name_idx]] = method_idx
elif kind == 0x04: # Class
u30() # slot_id
u30() # classi
elif kind == 0x05: # Function
u30() # slot_id
function_idx = u30()
methods[function_idx] = self.multinames[trait_name_idx]
else:
raise ExtractorError('Unsupported trait kind %d' % kind)
if attrs & 0x4 != 0: # Metadata present
metadata_count = u30()
for _c3 in range(metadata_count):
u30() # metadata index
return methods
# Classes
class_count = u30()
classes = []
for class_id in range(class_count):
name_idx = u30()
classes.append(_AVMClass(name_idx, self.multinames[name_idx]))
u30() # super_name idx
flags = read_byte()
if flags & 0x08 != 0: # Protected namespace is present
u30() # protected_ns_idx
intrf_count = u30()
for _c2 in range(intrf_count):
u30()
u30() # iinit
trait_count = u30()
for _c2 in range(trait_count):
parse_traits_info()
assert len(classes) == class_count
self._classes_by_name = dict((c.name, c) for c in classes)
for avm_class in classes:
u30() # cinit
trait_count = u30()
for _c2 in range(trait_count):
trait_methods = parse_traits_info()
avm_class.method_names.update(trait_methods.items())
avm_class.method_idxs.update(dict(
(idx, name)
for name, idx in trait_methods.items()))
# Scripts
script_count = u30()
for _c in range(script_count):
u30() # init
trait_count = u30()
for _c2 in range(trait_count):
parse_traits_info()
# Method bodies
method_body_count = u30()
Method = collections.namedtuple('Method', ['code', 'local_count'])
for _c in range(method_body_count):
method_idx = u30()
u30() # max_stack
local_count = u30()
u30() # init_scope_depth
u30() # max_scope_depth
code_length = u30()
code = read_bytes(code_length)
for avm_class in classes:
if method_idx in avm_class.method_idxs:
m = Method(code, local_count)
avm_class.methods[avm_class.method_idxs[method_idx]] = m
exception_count = u30()
for _c2 in range(exception_count):
u30() # from
u30() # to
u30() # target
u30() # exc_type
u30() # var_name
trait_count = u30()
for _c2 in range(trait_count):
parse_traits_info()
assert p + code_reader.tell() == len(code_tag)
def extract_class(self, class_name):
try:
return self._classes_by_name[class_name]
except KeyError:
raise ExtractorError('Class %r not found' % class_name)
def extract_function(self, avm_class, func_name):
if func_name in avm_class.method_pyfunctions:
return avm_class.method_pyfunctions[func_name]
if func_name in self._classes_by_name:
return self._classes_by_name[func_name].make_object()
if func_name not in avm_class.methods:
raise ExtractorError('Cannot find function %r' % func_name)
m = avm_class.methods[func_name]
def resfunc(args):
# Helper functions
coder = io.BytesIO(m.code)
s24 = lambda: _s24(coder)
u30 = lambda: _u30(coder)
print('Invoking %s.%s(%r)' % (avm_class.name, func_name, tuple(args)))
registers = ['(this)'] + list(args) + [None] * m.local_count
stack = []
while True:
opcode = _read_byte(coder)
print('opcode: %r, stack(%d): %r' % (opcode, len(stack), stack))
if opcode == 17: # iftrue
offset = s24()
value = stack.pop()
if value:
coder.seek(coder.tell() + offset)
elif opcode == 36: # pushbyte
v = _read_byte(coder)
stack.append(v)
elif opcode == 44: # pushstring
idx = u30()
stack.append(constant_strings[idx])
elif opcode == 48: # pushscope
# We don't implement the scope register, so we'll just
# ignore the popped value
new_scope = stack.pop()
elif opcode == 70: # callproperty
index = u30()
mname = self.multinames[index]
arg_count = u30()
args = list(reversed(
[stack.pop() for _ in range(arg_count)]))
obj = stack.pop()
if mname == 'split':
assert len(args) == 1
assert isinstance(args[0], compat_str)
assert isinstance(obj, compat_str)
if args[0] == '':
res = list(obj)
else:
res = obj.split(args[0])
stack.append(res)
elif mname == 'slice':
assert len(args) == 1
assert isinstance(args[0], int)
assert isinstance(obj, list)
res = obj[args[0]:]
stack.append(res)
elif mname == 'join':
assert len(args) == 1
assert isinstance(args[0], compat_str)
assert isinstance(obj, list)
res = args[0].join(obj)
stack.append(res)
elif mname in avm_class.method_pyfunctions:
stack.append(avm_class.method_pyfunctions[mname](args))
else:
raise NotImplementedError(
'Unsupported property %r on %r'
% (mname, obj))
elif opcode == 72: # returnvalue
res = stack.pop()
return res
elif opcode == 74: # constructproperty
index = u30()
arg_count = u30()
args = list(reversed(
[stack.pop() for _ in range(arg_count)]))
obj = stack.pop()
mname = self.multinames[index]
construct_method = self.extract_function(
obj.avm_class, mname)
# We do not actually call the constructor for now;
# we just pretend it does nothing
stack.append(obj)
elif opcode == 79: # callpropvoid
index = u30()
mname = self.multinames[index]
arg_count = u30()
args = list(reversed(
[stack.pop() for _ in range(arg_count)]))
obj = stack.pop()
if mname == 'reverse':
assert isinstance(obj, list)
obj.reverse()
else:
raise NotImplementedError(
'Unsupported (void) property %r on %r'
% (mname, obj))
elif opcode == 86: # newarray
arg_count = u30()
arr = []
for i in range(arg_count):
arr.append(stack.pop())
arr = arr[::-1]
stack.append(arr)
elif opcode == 93: # findpropstrict
index = u30()
mname = self.multinames[index]
res = self.extract_function(avm_class, mname)
stack.append(res)
elif opcode == 94: # findproperty
index = u30()
mname = self.multinames[index]
res = avm_class.variables.get(mname)
stack.append(res)
elif opcode == 96: # getlex
index = u30()
mname = self.multinames[index]
res = avm_class.variables.get(mname, None)
stack.append(res)
elif opcode == 97: # setproperty
index = u30()
value = stack.pop()
idx = self.multinames[index]
obj = stack.pop()
obj[idx] = value
elif opcode == 98: # getlocal
index = u30()
stack.append(registers[index])
elif opcode == 99: # setlocal
index = u30()
value = stack.pop()
registers[index] = value
elif opcode == 102: # getproperty
index = u30()
pname = self.multinames[index]
if pname == 'length':
obj = stack.pop()
assert isinstance(obj, list)
stack.append(len(obj))
else: # Assume attribute access
idx = stack.pop()
assert isinstance(idx, int)
obj = stack.pop()
assert isinstance(obj, list)
stack.append(obj[idx])
elif opcode == 128: # coerce
u30()
elif opcode == 133: # coerce_s
assert isinstance(stack[-1], (type(None), compat_str))
elif opcode == 164: # modulo
value2 = stack.pop()
value1 = stack.pop()
res = value1 % value2
stack.append(res)
elif opcode == 175: # greaterequals
value2 = stack.pop()
value1 = stack.pop()
result = value1 >= value2
stack.append(result)
elif opcode == 208: # getlocal_0
stack.append(registers[0])
elif opcode == 209: # getlocal_1
stack.append(registers[1])
elif opcode == 210: # getlocal_2
stack.append(registers[2])
elif opcode == 211: # getlocal_3
stack.append(registers[3])
elif opcode == 214: # setlocal_2
registers[2] = stack.pop()
elif opcode == 215: # setlocal_3
registers[3] = stack.pop()
else:
raise NotImplementedError(
'Unsupported opcode %d' % opcode)
avm_class.method_pyfunctions[func_name] = resfunc
return resfunc