PoC decoder working \o/
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parent
1863c5b243
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3
.gitmodules
vendored
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3
.gitmodules
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[submodule "splimport/apetag"]
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path = splimport/apetag
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url = https://github.com/robertmuth/apetag.git
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splimport/apetag
Submodule
1
splimport/apetag
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Subproject commit 55f3d7a51946787df401573fc92698ed88a2cdee
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67
splimport/apev2.ksy
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67
splimport/apev2.ksy
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meta:
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id: apev2
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file-extension: apetag
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endian: le
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seq:
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- id: tag
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type: tag
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types:
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tag:
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seq:
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- id: header
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type: header
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size: 32
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- id: frames
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type: frame
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repeat: expr
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repeat-expr: header.item_count
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- id: footer
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type: footer
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size: 32
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header:
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seq:
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- id: preamble
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contents: 'APETAGEX'
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- id: version_number
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type: u4
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- id: tag_size
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type: u4
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- id: item_count
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type: u4
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- id: tag_flags
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type: b32
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- id: reserved
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contents: [0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0]
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size: 8
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frame:
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seq:
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- id: item_size
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type: u4
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- id: item_flags
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type: b32
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- id: item_key
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type: str
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terminator: 0
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encoding: UTF-8
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- id: item_value
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size: item_size
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footer:
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seq:
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- id: preamble
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contents: 'APETAGEX'
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- id: version_number
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type: u4
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- id: tag_size
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type: u4
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- id: item_count
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type: u4
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- id: tag_flags
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type: b32
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- id: reserved
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contents: [0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0]
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size: 8
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86
splimport/apev2.py
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86
splimport/apev2.py
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# This is a generated section! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
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from pkg_resources import parse_version
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from kaitaistruct import __version__ as ks_version, KaitaiStruct, KaitaiStream, BytesIO
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if parse_version(ks_version) < parse_version('0.7'):
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raise Exception("Incompatible Kaitai Struct Python API: 0.7 or later is required, but you have %s" % (ks_version))
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class Apev2(KaitaiStruct):
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def __init__(self, _io, _parent=None, _root=None):
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self._io = _io
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self._parent = _parent
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self._root = _root if _root else self
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self._read()
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def _read(self):
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self.tag = self._root.Tag(self._io, self, self._root)
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class Tag(KaitaiStruct):
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def __init__(self, _io, _parent=None, _root=None):
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self._io = _io
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self._parent = _parent
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self._root = _root if _root else self
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self._read()
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def _read(self):
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self._raw_header = self._io.read_bytes(32)
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io = KaitaiStream(BytesIO(self._raw_header))
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self.header = self._root.Header(io, self, self._root)
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self.frames = [None] * (self.header.item_count)
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for i in range(self.header.item_count):
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self.frames[i] = self._root.Frame(self._io, self, self._root)
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self._raw_footer = self._io.read_bytes(32)
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io = KaitaiStream(BytesIO(self._raw_footer))
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self.footer = self._root.Footer(io, self, self._root)
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class Header(KaitaiStruct):
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def __init__(self, _io, _parent=None, _root=None):
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self._io = _io
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self._parent = _parent
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self._root = _root if _root else self
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self._read()
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def _read(self):
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self.preamble = self._io.ensure_fixed_contents(b"\x41\x50\x45\x54\x41\x47\x45\x58")
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self.version_number = self._io.read_u4le()
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self.tag_size = self._io.read_u4le()
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self.item_count = self._io.read_u4le()
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self.tag_flags = self._io.read_bits_int(32)
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self._io.align_to_byte()
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self.reserved = self._io.ensure_fixed_contents(b"\x00\x00\x00\x00\x00\x00\x00\x00")
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class Frame(KaitaiStruct):
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def __init__(self, _io, _parent=None, _root=None):
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self._io = _io
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self._parent = _parent
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self._root = _root if _root else self
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self._read()
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def _read(self):
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self.item_size = self._io.read_u4le()
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self.item_flags = self._io.read_bits_int(32)
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self._io.align_to_byte()
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self.item_key = (self._io.read_bytes_term(0, False, True, True)).decode(u"UTF-8")
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self.item_value = self._io.read_bytes(self.item_size)
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class Footer(KaitaiStruct):
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def __init__(self, _io, _parent=None, _root=None):
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self._io = _io
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self._parent = _parent
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self._root = _root if _root else self
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self._read()
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def _read(self):
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self.preamble = self._io.ensure_fixed_contents(b"\x41\x50\x45\x54\x41\x47\x45\x58")
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self.version_number = self._io.read_u4le()
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self.tag_size = self._io.read_u4le()
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self.item_count = self._io.read_u4le()
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self.tag_flags = self._io.read_bits_int(32)
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self._io.align_to_byte()
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self.reserved = self._io.ensure_fixed_contents(b"\x00\x00\x00\x00\x00\x00\x00\x00")
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@ -1,10 +1,32 @@
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import struct
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from apev2 import Apev2
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# apev2 spec: https://wiki.hydrogenaud.io/index.php?title=APEv2_specification
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# parse dates from XLastPlayed and XLastScheduled from SPL. by brainsmoke:
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# d=swap32(0x14a63351)
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# Y,M,D,h,m,s = 1980+(d>>25), (d>>21)&0xf, (d>>16)&0x1f, (d>>11)&0x1f, (d>>5)&0x3f, (d<<1)&0x3f
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# print(Y,M,D,h,m,s)
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# for swapping endianness of a binary package
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def swap32(i):
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return struct.unpack("<I", struct.pack(">I", i))[0]
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d=swap32(0x14a63351)
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Y,M,D,h,m,s = 1980+(d>>25), (d>>21)&0xf, (d>>16)&0x1f, (d>>11)&0x1f, (d>>5)&0x3f, (d<<1)&0x3f
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ape = Apev2.from_file('OMYG.apetag')
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print(Y,M,D,h,m,s)
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for item in ape.tag.frames:
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key = item.item_key
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value = item.item_value
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# print(key, value)
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if key == 'XLastPlayed':
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hex = value.hex()
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for i in range(0, len(hex), 8):
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hex_chunk = "0x{}".format(hex[i: i+8])
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d=swap32(int(hex_chunk, 16))
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Y,M,D,h,m,s = 1980+(d>>25), (d>>21)&0xf, (d>>16)&0x1f, (d>>11)&0x1f, (d>>5)&0x3f, (d<<1)&0x3f
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print(Y,M,D,h,m,s)
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