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-rw-r--r--test/swftests/.gitignore1
-rw-r--r--test/swftests/ArrayAccess.as19
-rw-r--r--test/swftests/ClassCall.as17
-rw-r--r--test/swftests/ClassConstruction.as15
-rw-r--r--test/swftests/LocalVars.as13
-rw-r--r--test/swftests/PrivateCall.as21
-rw-r--r--test/swftests/StaticAssignment.as13
-rw-r--r--test/swftests/StaticRetrieval.as16
-rw-r--r--test/test_swfinterp.py76
-rw-r--r--test/test_youtube_signature.py12
-rw-r--r--youtube_dl/extractor/youtube.py414
-rw-r--r--youtube_dl/swfinterp.py610
12 files changed, 814 insertions, 413 deletions
diff --git a/test/swftests/.gitignore b/test/swftests/.gitignore
new file mode 100644
index 000000000..da97ff7ca
--- /dev/null
+++ b/test/swftests/.gitignore
@@ -0,0 +1 @@
+*.swf
diff --git a/test/swftests/ArrayAccess.as b/test/swftests/ArrayAccess.as
new file mode 100644
index 000000000..e22caa386
--- /dev/null
+++ b/test/swftests/ArrayAccess.as
@@ -0,0 +1,19 @@
+// input: [["a", "b", "c", "d"]]
+// output: ["c", "b", "a", "d"]
+
+package {
+public class ArrayAccess {
+ public static function main(ar:Array):Array {
+ var aa:ArrayAccess = new ArrayAccess();
+ return aa.f(ar, 2);
+ }
+
+ private function f(ar:Array, num:Number):Array{
+ var x:String = ar[0];
+ var y:String = ar[num % ar.length];
+ ar[0] = y;
+ ar[num] = x;
+ return ar;
+ }
+}
+}
diff --git a/test/swftests/ClassCall.as b/test/swftests/ClassCall.as
new file mode 100644
index 000000000..aef58daf3
--- /dev/null
+++ b/test/swftests/ClassCall.as
@@ -0,0 +1,17 @@
+// input: []
+// output: 121
+
+package {
+public class ClassCall {
+ public static function main():int{
+ var f:OtherClass = new OtherClass();
+ return f.func(100,20);
+ }
+}
+}
+
+class OtherClass {
+ public function func(x: int, y: int):int {
+ return x+y+1;
+ }
+}
diff --git a/test/swftests/ClassConstruction.as b/test/swftests/ClassConstruction.as
new file mode 100644
index 000000000..436479f8f
--- /dev/null
+++ b/test/swftests/ClassConstruction.as
@@ -0,0 +1,15 @@
+// input: []
+// output: 0
+
+package {
+public class ClassConstruction {
+ public static function main():int{
+ var f:Foo = new Foo();
+ return 0;
+ }
+}
+}
+
+class Foo {
+
+}
diff --git a/test/swftests/LocalVars.as b/test/swftests/LocalVars.as
new file mode 100644
index 000000000..b2911a9f3
--- /dev/null
+++ b/test/swftests/LocalVars.as
@@ -0,0 +1,13 @@
+// input: [1, 2]
+// output: 3
+
+package {
+public class LocalVars {
+ public static function main(a:int, b:int):int{
+ var c:int = a + b + b;
+ var d:int = c - b;
+ var e:int = d;
+ return e;
+ }
+}
+}
diff --git a/test/swftests/PrivateCall.as b/test/swftests/PrivateCall.as
new file mode 100644
index 000000000..f1c110a37
--- /dev/null
+++ b/test/swftests/PrivateCall.as
@@ -0,0 +1,21 @@
+// input: []
+// output: 9
+
+package {
+public class PrivateCall {
+ public static function main():int{
+ var f:OtherClass = new OtherClass();
+ return f.func();
+ }
+}
+}
+
+class OtherClass {
+ private function pf():int {
+ return 9;
+ }
+
+ public function func():int {
+ return this.pf();
+ }
+}
diff --git a/test/swftests/StaticAssignment.as b/test/swftests/StaticAssignment.as
new file mode 100644
index 000000000..b061c219d
--- /dev/null
+++ b/test/swftests/StaticAssignment.as
@@ -0,0 +1,13 @@
+// input: [1]
+// output: 1
+
+package {
+public class StaticAssignment {
+ public static var v:int;
+
+ public static function main(a:int):int{
+ v = a;
+ return v;
+ }
+}
+}
diff --git a/test/swftests/StaticRetrieval.as b/test/swftests/StaticRetrieval.as
new file mode 100644
index 000000000..c8352d819
--- /dev/null
+++ b/test/swftests/StaticRetrieval.as
@@ -0,0 +1,16 @@
+// input: []
+// output: 1
+
+package {
+public class StaticRetrieval {
+ public static var v:int;
+
+ public static function main():int{
+ if (v) {
+ return 0;
+ } else {
+ return 1;
+ }
+ }
+}
+}
diff --git a/test/test_swfinterp.py b/test/test_swfinterp.py
new file mode 100644
index 000000000..3bb5a6308
--- /dev/null
+++ b/test/test_swfinterp.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python
+
+# Allow direct execution
+import os
+import sys
+import unittest
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+
+import io
+import json
+import re
+import subprocess
+
+from youtube_dl.swfinterp import SWFInterpreter
+
+
+TEST_DIR = os.path.join(
+ os.path.dirname(os.path.abspath(__file__)), 'swftests')
+
+
+class TestSWFInterpreter(unittest.TestCase):
+ pass
+
+
+def _make_testfunc(testfile):
+ m = re.match(r'^(.*)\.(as)$', testfile)
+ if not m:
+ return
+ test_id = m.group(1)
+
+ def test_func(self):
+ as_file = os.path.join(TEST_DIR, testfile)
+ swf_file = os.path.join(TEST_DIR, test_id + '.swf')
+ if ((not os.path.exists(swf_file))
+ or os.path.getmtime(swf_file) < os.path.getmtime(as_file)):
+ # Recompile
+ try:
+ subprocess.check_call(['mxmlc', '-output', swf_file, as_file])
+ except OSError as ose:
+ if ose.errno == errno.ENOENT:
+ print('mxmlc not found! Skipping test.')
+ return
+ raise
+
+ with open(swf_file, 'rb') as swf_f:
+ swf_content = swf_f.read()
+ swfi = SWFInterpreter(swf_content)
+
+ with io.open(as_file, 'r', encoding='utf-8') as as_f:
+ as_content = as_f.read()
+
+ def _find_spec(key):
+ m = re.search(
+ r'(?m)^//\s*%s:\s*(.*?)\n' % re.escape(key), as_content)
+ if not m:
+ raise ValueError('Cannot find %s in %s' % (key, testfile))
+ return json.loads(m.group(1))
+
+ input_args = _find_spec('input')
+ output = _find_spec('output')
+
+ swf_class = swfi.extract_class(test_id)
+ func = swfi.extract_function(swf_class, 'main')
+ res = func(input_args)
+ self.assertEqual(res, output)
+
+ test_func.__name__ = str('test_swf_' + test_id)
+ setattr(TestSWFInterpreter, test_func.__name__, test_func)
+
+
+for testfile in os.listdir(TEST_DIR):
+ _make_testfunc(testfile)
+
+if __name__ == '__main__':
+ unittest.main()
diff --git a/test/test_youtube_signature.py b/test/test_youtube_signature.py
index d95533959..609e7078c 100644
--- a/test/test_youtube_signature.py
+++ b/test/test_youtube_signature.py
@@ -45,6 +45,12 @@ _TESTS = [
u'2ACFC7A61CA478CD21425E5A57EBD73DDC78E22A.2094302436B2D377D14A3BBA23022D023B8BC25AA',
u'A52CB8B320D22032ABB3A41D773D2B6342034902.A22E87CDD37DBE75A5E52412DC874AC16A7CFCA2',
),
+ (
+ u'http://s.ytimg.com/yts/swfbin/player-vfl5vIhK2/watch_as3.swf',
+ u'swf',
+ 86,
+ u'O1I3456789abcde0ghijklmnopqrstuvwxyzABCDEFGHfJKLMN2PQRSTUVWXY\\!"#$%&\'()*+,-./:;<=>?'
+ ),
]
@@ -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 5449df8e0..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,
@@ -450,417 +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 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
-
- # Classes
+ swfi = SWFInterpreter(file_contents)
TARGET_CLASSNAME = u'SignatureDecipher'
- searched_idx = multinames.index(TARGET_CLASSNAME)
- searched_class_id = None
- class_count = u30()
- for class_id in range(class_count):
- name_idx = u30()
- if name_idx == searched_idx:
- # We found the class we're looking for!
- searched_class_id = class_id
- 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()
-
- if searched_class_id is None:
- raise ExtractorError(u'Target class %r not found' %
- TARGET_CLASSNAME)
-
- method_names = {}
- method_idxs = {}
- for class_id in range(class_count):
- u30() # cinit
- trait_count = u30()
- for _c2 in range(trait_count):
- trait_methods = parse_traits_info()
- if class_id == searched_class_id:
- method_names.update(trait_methods.items())
- 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'])
- methods = {}
- 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)
- if method_idx in method_idxs:
- m = Method(code, local_count)
- methods[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)
- assert len(methods) == len(method_idxs)
-
- method_pyfunctions = {}
-
- def extract_function(func_name):
- if func_name in method_pyfunctions:
- return method_pyfunctions[func_name]
- if func_name not in methods:
- raise ExtractorError(u'Cannot find function %r' % func_name)
- m = 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 == 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 method_pyfunctions:
- stack.append(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 == 93: # findpropstrict
- index = u30(coder)
- mname = multinames[index]
- res = extract_function(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 == 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)
-
- method_pyfunctions[func_name] = resfunc
- return resfunc
-
- initial_function = extract_function(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..79d86152d
--- /dev/null
+++ b/youtube_dl/swfinterp.py
@@ -0,0 +1,610 @@
+from __future__ import unicode_literals
+
+import collections
+import io
+import struct
+import zlib
+
+from .utils import (
+ compat_str,
+ ExtractorError,
+)
+
+
+def _extract_tags(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])
+
+ # Determine number of bits in framesize rectangle
+ framesize_nbits = struct.unpack('!B', content[:1])[0] >> 3
+ framesize_len = (5 + 4 * framesize_nbits + 7) // 8
+
+ pos = framesize_len + 2 + 2
+ 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), \
+ ('Tag %d ends at %d+%d - that\'s longer than the file (%d)'
+ % (tag_code, 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 _ScopeDict(dict):
+ def __init__(self, avm_class):
+ super(_ScopeDict, self).__init__()
+ self.avm_class = avm_class
+
+ def __repr__(self):
+ return '%s__Scope(%s)' % (
+ self.avm_class.name,
+ super(_ScopeDict, self).__repr__())
+
+
+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 = _ScopeDict(self)
+
+ def make_object(self):
+ return _AVMClass_Object(self)
+
+ def __repr__(self):
+ return '_AVMClass(%s)' % (self.name)
+
+ def register_methods(self, methods):
+ self.method_names.update(methods.items())
+ self.method_idxs.update(dict(
+ (idx, name)
+ for name, idx in methods.items()))
+
+
+class _Multiname(object):
+ def __init__(self, kind):
+ self.kind = kind
+
+ def __repr__(self):
+ return '[MULTINAME kind: 0x%x]' % self.kind
+
+
+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
+ last_byte = b'\xff' if (ord(bs[2:3]) >= 0x80) else b'\x00'
+ return struct.unpack('<i', bs + last_byte)[0]
+
+
+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):
+ assert count >= 0
+ 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):
+ code_tag = next(tag
+ for tag_code, tag in _extract_tags(file_contents)
+ 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(max(0, (double_count - 1)) * 8)
+ string_count = u30()
+ self.constant_strings = ['']
+ for _c in range(1, string_count):
+ s = _read_string(code_reader)
+ self.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(self.constant_strings[name_idx])
+ else:
+ self.multinames.append(_Multiname(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()
+
+ cname = self.multinames[name_idx]
+ avm_class = _AVMClass(name_idx, cname)
+ classes.append(avm_class)
+
+ 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):
+ trait_methods = parse_traits_info()
+ avm_class.register_methods(trait_methods)
+
+ 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.register_methods(trait_methods)
+
+ # 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 %s.%s' % (
+ avm_class.name, 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)
+
+ registers = [avm_class.variables] + list(args) + [None] * m.local_count
+ stack = []
+ scopes = collections.deque([
+ self._classes_by_name, avm_class.variables])
+ while True:
+ opcode = _read_byte(coder)
+ if opcode == 17: # iftrue
+ offset = s24()
+ value = stack.pop()
+ if value:
+ coder.seek(coder.tell() + offset)
+ elif opcode == 18: # iffalse
+ offset = s24()
+ value = stack.pop()
+ if not value:
+ coder.seek(coder.tell() + offset)
+ elif opcode == 36: # pushbyte
+ v = _read_byte(coder)
+ stack.append(v)
+ elif opcode == 42: # dup
+ value = stack[-1]
+ stack.append(value)
+ elif opcode == 44: # pushstring
+ idx = u30()
+ stack.append(self.constant_strings[idx])
+ elif opcode == 48: # pushscope
+ new_scope = stack.pop()
+ scopes.append(new_scope)
+ elif opcode == 66: # construct
+ arg_count = u30()
+ args = list(reversed(
+ [stack.pop() for _ in range(arg_count)]))
+ obj = stack.pop()
+ res = obj.avm_class.make_object()
+ stack.append(res)
+ 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 isinstance(obj, _AVMClass_Object):
+ func = self.extract_function(obj.avm_class, mname)
+ res = func(args)
+ stack.append(res)
+ continue
+ elif isinstance(obj, _ScopeDict):
+ if mname in obj.avm_class.method_names:
+ func = self.extract_function(obj.avm_class, mname)
+ res = func(args)
+ else:
+ res = obj[mname]
+ stack.append(res)
+ continue
+ elif isinstance(obj, compat_str):
+ if mname == 'split':
+ assert len(args) == 1
+ assert isinstance(args[0], compat_str)
+ if args[0] == '':
+ res = list(obj)
+ else:
+ res = obj.split(args[0])
+ stack.append(res)
+ continue
+ elif isinstance(obj, list):
+ if mname == 'slice':
+ assert len(args) == 1
+ assert isinstance(args[0], int)
+ res = obj[args[0]:]
+ stack.append(res)
+ continue
+ elif mname == 'join':
+ assert len(args) == 1
+ assert isinstance(args[0], compat_str)
+ res = args[0].join(obj)
+ stack.append(res)
+ continue
+ 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]
+ assert isinstance(obj, _AVMClass)
+ construct_method = self.extract_function(
+ obj, mname)
+ # We do not actually call the constructor for now;
+ # we just pretend it does nothing
+ stack.append(obj.make_object())
+ 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]
+ for s in reversed(scopes):
+ if mname in s:
+ res = s
+ break
+ else:
+ res = scopes[0]
+ stack.append(res[mname])
+ elif opcode == 94: # findproperty
+ index = u30()
+ mname = self.multinames[index]
+ for s in reversed(scopes):
+ if mname in s:
+ res = s
+ break
+ else:
+ res = avm_class.variables
+ stack.append(res)
+ elif opcode == 96: # getlex
+ index = u30()
+ mname = self.multinames[index]
+ for s in reversed(scopes):
+ if mname in s:
+ scope = s
+ break
+ else:
+ scope = avm_class.variables
+ # I cannot find where static variables are initialized
+ # so let's just return None
+ res = scope.get(mname)
+ stack.append(res)
+ elif opcode == 97: # setproperty
+ index = u30()
+ value = stack.pop()
+ idx = self.multinames[index]
+ if isinstance(idx, _Multiname):
+ idx = stack.pop()
+ 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 == 115: # convert_
+ value = stack.pop()
+ intvalue = int(value)
+ stack.append(intvalue)
+ elif opcode == 128: # coerce
+ u30()
+ elif opcode == 133: # coerce_s
+ assert isinstance(stack[-1], (type(None), compat_str))
+ elif opcode == 160: # add
+ value2 = stack.pop()
+ value1 = stack.pop()
+ res = value1 + value2
+ stack.append(res)
+ elif opcode == 161: # subtract
+ value2 = stack.pop()
+ value1 = stack.pop()
+ res = value1 - value2
+ stack.append(res)
+ 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 == 212: # setlocal_0
+ registers[0] = stack.pop()
+ elif opcode == 213: # setlocal_1
+ registers[1] = stack.pop()
+ 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 2025-10-31 14:40:42 +0000