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@ -590,99 +590,83 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor): |
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for tag_code, tag in extract_tags(content) |
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if tag_code == 82) |
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p = code_tag.index(b'\0', 4) + 1 |
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code_reader = io.BytesIO(code_tag[p:]) |
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# Parse ABC (AVM2 ByteCode) |
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def read_int(data=None, pos=None): |
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if hasattr(data, 'read'): |
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assert pos is None |
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res = 0 |
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shift = 0 |
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for _ in range(5): |
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buf = data.read(1) |
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assert len(buf) == 1 |
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b = struct.unpack('<B', buf)[0] |
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res = res | ((b & 0x7f) << shift) |
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if b & 0x80 == 0: |
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break |
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shift += 7 |
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return res |
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if data is None: |
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data = code_tag |
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if pos is None: |
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pos = p |
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def read_int(reader=None): |
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if reader is None: |
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reader = code_reader |
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res = 0 |
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shift = 0 |
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for _ in range(5): |
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b = struct.unpack('<B', data[pos:pos+1])[0] |
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pos += 1 |
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buf = reader.read(1) |
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assert len(buf) == 1 |
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b = struct.unpack('<B', buf)[0] |
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res = res | ((b & 0x7f) << shift) |
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if b & 0x80 == 0: |
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break |
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shift += 7 |
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return (res, pos) |
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assert read_int(b'\x00', 0) == (0, 1) |
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assert read_int(b'\x10', 0) == (16, 1) |
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assert read_int(b'\x34', 0) == (0x34, 1) |
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assert read_int(b'\xb4\x12', 0) == (0x12 * 0x80 + 0x34, 2) |
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assert read_int(b'\xff\xff\xff\x00', 0) == (0x1fffff, 4) |
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def u30(*args, **kwargs): |
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res = read_int(*args, **kwargs) |
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if isinstance(res, tuple): |
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assert res[0] & 0xf0000000 == 0 |
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else: |
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assert res & 0xf0000000 == 0 |
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return res |
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def u30(reader=None): |
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res = read_int(reader) |
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assert res & 0xf0000000 == 0 |
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return res |
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u32 = read_int |
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def s32(data=None, pos=None): |
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v, pos = read_int(data, pos) |
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def s32(reader=None): |
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v = read_int(reader) |
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if v & 0x80000000 != 0: |
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v = - ((v ^ 0xffffffff) + 1) |
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return (v, pos) |
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assert s32(b'\xff\xff\xff\xff\x0f', 0) == (-1, 5) |
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def string(): |
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slen, p = u30() |
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return (code_tag[p:p+slen].decode('utf-8'), p + slen) |
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def read_byte(data=None, pos=None): |
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if data is None: |
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data = code_tag |
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if pos is None: |
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pos = p |
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res = struct.unpack('<B', data[pos:pos+1])[0] |
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return (res, pos + 1) |
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return v |
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def string(reader=None): |
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if reader is None: |
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reader = code_reader |
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slen = u30(reader) |
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resb = reader.read(slen) |
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assert len(resb) == slen |
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return resb.decode('utf-8') |
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def read_bytes(count, reader=None): |
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if reader is None: |
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reader = code_reader |
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resb = reader.read(count) |
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assert len(resb) == count |
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return resb |
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def read_byte(reader=None): |
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resb = read_bytes(1, reader=reader) |
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res = struct.unpack('<B', resb)[0] |
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return res |
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# minor_version + major_version |
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p += 2 + 2 |
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_ = read_bytes(4) |
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# Constant pool |
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int_count, p = u30() |
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int_count = u30() |
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for _c in range(1, int_count): |
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_, p = s32() |
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uint_count, p = u30() |
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_ = s32() |
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uint_count = u30() |
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for _c in range(1, uint_count): |
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_, p = u32() |
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double_count, p = u30() |
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p += (double_count-1) * 8 |
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string_count, p = u30() |
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_ = u32() |
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double_count = u30() |
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_ = read_bytes((double_count-1) * 8) |
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string_count = u30() |
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constant_strings = [u''] |
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for _c in range(1, string_count): |
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s, p = string() |
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s = string() |
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constant_strings.append(s) |
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namespace_count, p = u30() |
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namespace_count = u30() |
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for _c in range(1, namespace_count): |
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p += 1 # kind |
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_, p = u30() # name |
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ns_set_count, p = u30() |
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_ = read_bytes(1) # kind |
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_ = u30() # name |
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ns_set_count = u30() |
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for _c in range(1, ns_set_count): |
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count, p = u30() |
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count = u30() |
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for _c2 in range(count): |
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_, p = u30() |
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multiname_count, p = u30() |
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_ = u30() |
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multiname_count = u30() |
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MULTINAME_SIZES = { |
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0x07: 2, # QName |
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0x0d: 2, # QNameA |
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@ -697,108 +681,106 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor): |
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} |
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multinames = [u''] |
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for _c in range(1, multiname_count): |
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kind, p = u30() |
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kind = u30() |
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assert kind in MULTINAME_SIZES, u'Invalid multiname kind %r' % kind |
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if kind == 0x07: |
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namespace_idx, p = u30() |
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name_idx, p = u30() |
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namespace_idx = u30() |
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name_idx = u30() |
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multinames.append(constant_strings[name_idx]) |
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else: |
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multinames.append('[MULTINAME kind: %d]' % kind) |
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for _c2 in range(MULTINAME_SIZES[kind]): |
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_, p = u30() |
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_ = u30() |
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# Methods |
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method_count, p = u30() |
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method_count = u30() |
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MethodInfo = collections.namedtuple( |
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'MethodInfo', |
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['NEED_ARGUMENTS', 'NEED_REST']) |
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method_infos = [] |
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for method_id in range(method_count): |
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param_count, p = u30() |
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_, p = u30() # return type |
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param_count = u30() |
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_ = u30() # return type |
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for _ in range(param_count): |
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_, p = u30() # param type |
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_, p = u30() # name index (always 0 for youtube) |
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flags, p = read_byte() |
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_ = u30() # param type |
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_ = u30() # name index (always 0 for youtube) |
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flags = read_byte() |
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if flags & 0x08 != 0: |
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# Options present |
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option_count, p = u30() |
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option_count = u30() |
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for c in range(option_count): |
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_, p = u30() # val |
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p += 1 # kind |
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_ = u30() # val |
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_ = read_bytes(1) # kind |
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if flags & 0x80 != 0: |
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# Param names present |
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for _ in range(param_count): |
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_, p = u30() # param name |
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_ = u30() # param name |
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mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0) |
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method_infos.append(mi) |
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# Metadata |
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metadata_count, p = u30() |
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metadata_count = u30() |
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for _c in range(metadata_count): |
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_, p = u30() # name |
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item_count, p = u30() |
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_ = u30() # name |
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item_count = u30() |
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for _c2 in range(item_count): |
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_, p = u30() # key |
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_, p = u30() # value |
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def parse_traits_info(pos=None): |
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if pos is None: |
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pos = p |
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trait_name_idx, pos = u30(pos=pos) |
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kind_full, pos = read_byte(pos=pos) |
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_ = u30() # key |
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_ = u30() # value |
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def parse_traits_info(): |
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trait_name_idx = u30() |
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kind_full = read_byte() |
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kind = kind_full & 0x0f |
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attrs = kind_full >> 4 |
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methods = {} |
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if kind in [0x00, 0x06]: # Slot or Const |
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_, pos = u30(pos=pos) # Slot id |
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type_name_idx, pos = u30(pos=pos) |
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vindex, pos = u30(pos=pos) |
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_ = u30() # Slot id |
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type_name_idx = u30() |
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vindex = u30() |
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if vindex != 0: |
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_, pos = read_byte(pos=pos) # vkind |
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_ = read_byte() # vkind |
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elif kind in [0x01, 0x02, 0x03]: # Method / Getter / Setter |
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_, pos = u30(pos=pos) # disp_id |
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method_idx, pos = u30(pos=pos) |
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_ = u30() # disp_id |
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method_idx = u30() |
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methods[multinames[trait_name_idx]] = method_idx |
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elif kind == 0x04: # Class |
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_, pos = u30(pos=pos) # slot_id |
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_, pos = u30(pos=pos) # classi |
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_ = u30() # slot_id |
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_ = u30() # classi |
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elif kind == 0x05: # Function |
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_, pos = u30(pos=pos) # slot_id |
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function_idx, pos = u30(pos=pos) |
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_ = u30() # slot_id |
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function_idx = u30() |
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methods[function_idx] = multinames[trait_name_idx] |
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else: |
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raise ExtractorError(u'Unsupported trait kind %d' % kind) |
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if attrs & 0x4 != 0: # Metadata present |
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metadata_count, pos = u30(pos=pos) |
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metadata_count = u30() |
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for _c3 in range(metadata_count): |
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_, pos = u30(pos=pos) |
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_ = u30() |
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return (methods, pos) |
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return methods |
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# Classes |
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TARGET_CLASSNAME = u'SignatureDecipher' |
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searched_idx = multinames.index(TARGET_CLASSNAME) |
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searched_class_id = None |
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class_count, p = u30() |
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class_count = u30() |
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for class_id in range(class_count): |
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name_idx, p = u30() |
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name_idx = u30() |
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if name_idx == searched_idx: |
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# We found the class we're looking for! |
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searched_class_id = class_id |
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_, p = u30() # super_name idx |
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flags, p = read_byte() |
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_ = u30() # super_name idx |
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flags = read_byte() |
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if flags & 0x08 != 0: # Protected namespace is present |
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protected_ns_idx, p = u30() |
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intrf_count, p = u30() |
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protected_ns_idx = u30() |
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intrf_count = u30() |
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for _c2 in range(intrf_count): |
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_, p = u30() |
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_, p = u30() # iinit |
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trait_count, p = u30() |
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_ = u30() |
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_ = u30() # iinit |
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trait_count = u30() |
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for _c2 in range(trait_count): |
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_, p = parse_traits_info() |
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_ = parse_traits_info() |
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if searched_class_id is None: |
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raise ExtractorError(u'Target class %r not found' % |
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@ -807,10 +789,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor): |
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method_names = {} |
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method_idxs = {} |
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for class_id in range(class_count): |
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_, p = u30() # cinit |
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trait_count, p = u30() |
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_ = u30() # cinit |
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trait_count = u30() |
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for _c2 in range(trait_count): |
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trait_methods, p = parse_traits_info() |
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trait_methods = parse_traits_info() |
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if class_id == searched_class_id: |
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method_names.update(trait_methods.items()) |
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method_idxs.update(dict( |
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@ -818,40 +800,40 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor): |
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for name, idx in trait_methods.items())) |
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# Scripts |
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script_count, p = u30() |
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script_count = u30() |
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for _c in range(script_count): |
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_, p = u30() # init |
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trait_count, p = u30() |
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_ = u30() # init |
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trait_count = u30() |
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for _c2 in range(trait_count): |
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_, p = parse_traits_info() |
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_ = parse_traits_info() |
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# Method bodies |
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method_body_count, p = u30() |
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method_body_count = u30() |
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Method = collections.namedtuple('Method', ['code', 'local_count']) |
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methods = {} |
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for _c in range(method_body_count): |
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method_idx, p = u30() |
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max_stack, p = u30() |
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local_count, p = u30() |
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init_scope_depth, p = u30() |
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max_scope_depth, p = u30() |
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code_length, p = u30() |
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method_idx = u30() |
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max_stack = u30() |
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local_count = u30() |
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init_scope_depth = u30() |
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max_scope_depth = u30() |
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code_length = u30() |
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code = read_bytes(code_length) |
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if method_idx in method_idxs: |
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m = Method(code_tag[p:p+code_length], local_count) |
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m = Method(code, local_count) |
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methods[method_idxs[method_idx]] = m |
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p += code_length |
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exception_count, p = u30() |
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exception_count = u30() |
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for _c2 in range(exception_count): |
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_, p = u30() # from |
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_, p = u30() # to |
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_, p = u30() # target |
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_, p = u30() # exc_type |
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_, p = u30() # var_name |
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trait_count, p = u30() |
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_ = u30() # from |
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_ = u30() # to |
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_ = u30() # target |
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_ = u30() # exc_type |
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_ = u30() # var_name |
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trait_count = u30() |
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for _c2 in range(trait_count): |
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_, p = parse_traits_info() |
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_ = parse_traits_info() |
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assert p == len(code_tag) |
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assert p + code_reader.tell() == len(code_tag) |
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assert len(methods) == len(method_idxs) |
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method_pyfunctions = {} |
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Philipp Hagemeister
11 years ago