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https://github.com/yt-dlp/yt-dlp.git
synced 2024-11-10 10:23:16 +00:00
Use reader instead of indexing
This commit is contained in:
Philipp Hagemeister
parent
8379969834
commit
ba552f542f
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@ -590,99 +590,83 @@ def extract_tags(content):
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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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return res
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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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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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return v
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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 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_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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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 @@ def read_byte(data=None, pos=None):
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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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_ = u30() # key
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_ = 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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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 @@ def parse_traits_info(pos=None):
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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 @@ def parse_traits_info(pos=None):
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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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