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Allow shifted views to omit protocol padding

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Golumpa 2026-08-19 10:51:12 +01:00
parent e44c5eecbf
commit 81301fea85
2 changed files with 33 additions and 1 deletions
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9
src/nte_history_exporter/decoder/structured_protocol.py
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@ -12,6 +12,9 @@ MONOPOLY_MARKER = b"FMonopolyLotteryRecordData"
FORK_MARKER = b"FForkLotteryRecordData"
MAX_ROWS_PER_BLOCK = 100
MAX_STRING_LENGTH = 256
# Bit-packed UDP views can omit up to the final three protocol-padding bytes.
# The declared size covers that padding, while all declared rows remain intact.
MAX_SHIFTED_BLOCK_PADDING_SHORTFALL = 3
DOTNET_EPOCH_TICKS = 621_355_968_000_000_000
DOTNET_TICKS_PER_SECOND = 10_000_000
MIN_UNIX_SECONDS = 1_500_000_000
@ -230,7 +233,11 @@ def _parse_block(
pos += 12
if row_count > MAX_ROWS_PER_BLOCK:
raise StructuredProtocolError(f"row count is too large: {row_count}")
if declared_size > len(data) - pos:
size_shortfall = declared_size - (len(data) - pos)
if size_shortfall > 0 and not (
view_name.startswith("shift8:")
and size_shortfall <= MAX_SHIFTED_BLOCK_PADDING_SHORTFALL
):
raise StructuredProtocolError("declared block size exceeds payload")
reader = _Reader(data, pos)