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-rw-r--r--test/test_youtube_signature.py12
-rw-r--r--youtube_dl/extractor/youtube.py454
-rw-r--r--youtube_dl/swfinterp.py503
3 files changed, 516 insertions, 453 deletions
diff --git a/test/test_youtube_signature.py b/test/test_youtube_signature.py
index d95533959..e443e0be8 100644
--- a/test/test_youtube_signature.py
+++ b/test/test_youtube_signature.py
@@ -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):
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 16f4a047d..623056bd9 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -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):
diff --git a/youtube_dl/swfinterp.py b/youtube_dl/swfinterp.py
new file mode 100644
index 000000000..1cd292138
--- /dev/null
+++ b/youtube_dl/swfinterp.py
@@ -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
+
generated by cgit v1.2.3 (git 2.26.2) at 2025-11-04 10:37:49 +0000