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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'2ACFC7A61CA478CD21425E5A57EBD73DDC78E22A.2094302436B2D377D14A3BBA23022D023B8BC25AA',
u'A52CB8B320D22032ABB3A41D773D2B6342034902.A22E87CDD37DBE75A5E52412DC874AC16A7CFCA2', u'A52CB8B320D22032ABB3A41D773D2B6342034902.A22E87CDD37DBE75A5E52412DC874AC16A7CFCA2',
), ),
(
u'http://s.ytimg.com/yts/swfbin/player-vfl5vIhK2/watch_as3.swf',
u'swf',
86,
u'23456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!?#$%&\'()*+,-./:;<=>"'
),
] ]
@ -57,12 +63,12 @@ class TestSignature(unittest.TestCase):
def make_tfunc(url, stype, sig_input, expected_sig): def make_tfunc(url, stype, sig_input, expected_sig):
basename = url.rpartition('/')[2] m = re.match(r'.*-([a-zA-Z0-9_-]+)(?:/watch_as3)?\.[a-z]+$', url)
m = re.match(r'.*-([a-zA-Z0-9_-]+)\.[a-z]+$', basename) assert m, '%r should follow URL format' % url
assert m, '%r should follow URL format' % basename
test_id = m.group(1) test_id = m.group(1)
def test_func(self): def test_func(self):
basename = 'player-%s.%s' % (test_id, stype)
fn = os.path.join(self.TESTDATA_DIR, basename) fn = os.path.join(self.TESTDATA_DIR, basename)
if not os.path.exists(fn): 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 .common import InfoExtractor, SearchInfoExtractor
from .subtitles import SubtitlesInfoExtractor from .subtitles import SubtitlesInfoExtractor
from ..jsinterp import JSInterpreter from ..jsinterp import JSInterpreter
from ..swfinterp import SWFInterpreter
from ..utils import ( from ..utils import (
compat_chr, compat_chr,
compat_parse_qs, compat_parse_qs,
@ -450,457 +451,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
return lambda s: initial_function([s]) return lambda s: initial_function([s])
def _parse_sig_swf(self, file_contents): def _parse_sig_swf(self, file_contents):
if file_contents[1:3] != b'WS': swfi = SWFInterpreter(file_contents)
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
TARGET_CLASSNAME = u'SignatureDecipher' TARGET_CLASSNAME = u'SignatureDecipher'
searched_class = next( searched_class = swfi.extract_class(TARGET_CLASSNAME)
c for c in classes if c.name == TARGET_CLASSNAME) initial_function = swfi.extract_function(searched_class, u'decipher')
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')
return lambda s: initial_function([s]) return lambda s: initial_function([s])
def _decrypt_signature(self, s, video_id, player_url, age_gate=False): 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