forked from Dniel97/artemis
50 lines
1.6 KiB
Python
50 lines
1.6 KiB
Python
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from typing import Tuple
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import struct
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import logging
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BIGINT_OFF = 16
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LONG_OFF = 8
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INT_OFF = 4
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SHORT_OFF = 2
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BYTE_OFF = 1
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def decode_num(data: bytes, offset: int, size: int) -> int:
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try:
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return int.from_bytes(data[offset:offset + size], 'big')
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except:
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logging.getLogger('sao').error(f"Failed to parse {data[offset:offset + size]} as BE number of width {size}")
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return 0
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def decode_byte(data: bytes, offset: int) -> int:
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return decode_num(data, offset, BYTE_OFF)
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def decode_short(data: bytes, offset: int) -> int:
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return decode_num(data, offset, SHORT_OFF)
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def decode_int(data: bytes, offset: int) -> int:
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return decode_num(data, offset, INT_OFF)
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def decode_long(data: bytes, offset: int) -> int:
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return decode_num(data, offset, LONG_OFF)
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def decode_bigint(data: bytes, offset: int) -> int:
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return decode_num(data, offset, BIGINT_OFF)
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def decode_str(data: bytes, offset: int) -> Tuple[str, int]:
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try:
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str_len = decode_int(data, offset)
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num_bytes_decoded = INT_OFF + str_len
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str_out = data[offset + INT_OFF:offset + num_bytes_decoded].decode("utf-16-le", errors="replace")
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return (str_out, num_bytes_decoded)
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except:
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logging.getLogger('sao').error(f"Failed to parse {data[offset:]} as string!")
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return ("", 0)
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def encode_str(s: str) -> bytes:
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try:
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str_bytes = s.encode("utf-16-le", errors="replace")
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str_len_bytes = struct.pack("!I", len(str_bytes))
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return str_len_bytes + str_bytes
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except:
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logging.getLogger('sao').error(f"Failed to encode {s} as bytes!")
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return b""
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