778 lines
32 KiB
Python
778 lines
32 KiB
Python
"""
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blastware_file.py — Blastware binary file codec for bidirectional interoperability.
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Reads and writes the proprietary Instantel/Blastware file formats:
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.N00 — Single-shot triggered waveform event
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.9T0 — Continuous-mode triggered waveform event
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.MLG — Monitor log (monitoring session history)
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All formats share a common 22-byte file header prefix. Blastware identifies
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the file type by extension, not by a magic marker inside the header.
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IMPORTANT — .N00 vs .9T0:
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Both extensions share identical internal binary structure (same 22-byte
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header, same type tag 00 12 03 00, same STRT record layout). Blastware
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uses the extension to identify the recording mode:
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.N00 → single-shot (0C waveform sub_code = 0x10)
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.9T0 → continuous (0C waveform sub_code = 0x03)
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Callers should use blastware_filename() to pick the correct extension
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from event.record_type. Histogram-mode file extension is unknown (TODO).
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─── File structure overview ─────────────────────────────────────────────────────
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N00 (single-shot waveform, confirmed from example-events/4-3-26-multi/M529LIY6.N00):
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[22B header] [21B STRT record] [body bytes] [26B footer]
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Header (22 bytes):
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10 00 01 80 00 00 — fixed prefix
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49 6e 73 74 61 6e 74 65 6c 00 — b'Instantel\x00'
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07 2c — fixed
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00 12 03 00 — N00 type marker
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STRT record (21 bytes, immediately follows header):
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53 54 52 54 — b'STRT'
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ff fe — fixed (2 bytes)
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[key4] — 4-byte waveform event key
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[key4] — 4-byte waveform event key (repeated)
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[zeros] — 7 bytes padding
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[rectime] — uint8 record time in seconds
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Body (variable — reconstructed from A5 frame data):
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The body bytes are derived from the raw A5 frame wire content, specifically
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from the DLE-decoded representation of each frame's contribution. See the
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_frame_body_bytes() helper for the exact algorithm.
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Footer (26 bytes):
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0e 08
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[ts1: 8B big-endian timestamp] — start timestamp
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[ts2: 8B big-endian timestamp] — stop timestamp
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00 01 00 02 00 00
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[crc: 2B] — CRC (algorithm unconfirmed; written as 0x00 0x00 placeholder)
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Timestamp format (big-endian, 8 bytes):
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[day] [month] [year_HI] [year_LO] [0x00] [hour] [min] [sec]
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MLG (monitor log, confirmed from example-events/4-3-26-multi/BE11529.MLG):
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[308B header] [N × 292B records]
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Header (308 bytes):
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Offset 0x00: 10 00 01 80 00 00 Instantel\x00 07 2c 22 01 0e a0 — fixed (16B)
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Offset 0x10: ... (unknown structure, written as zeros + serial)
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Offset 0x2A: serial number (8 bytes, null-padded ASCII, e.g. "BE11529")
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... zero-padded to 308 bytes total
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Record (292 bytes each):
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[2B CRC] — unknown algorithm; written as 0x00 0x00
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22 01 0e 80 — record marker
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[ts1: 8B big-endian timestamp] — start time
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[ts2: 8B big-endian timestamp] — stop time (zeros if no stop)
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[4B flags] — see MLG_FLAGS_* constants below
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[10B serial] — null-padded serial number ASCII
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[text] — for trigger records: [0x08][8B ts1_copy] then ASCII "Geo: X.XXX in/s"
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for monitoring records: b'' (or minimal separator)
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[zero-padded to 292 bytes]
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─── Critical implementation notes ──────────────────────────────────────────────
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N00 body reconstruction algorithm (confirmed 2026-04-21 from verification against
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M529LIY6.N00 using raw_s3_20260403_153508.bin capture):
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The N00 body bytes come from the A5 frame content, stripped of DLE-framing
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artifacts. Each A5 frame contributes a different slice of its data section,
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with DLE+{0x02,0x03,0x04} byte pairs stripped.
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Skip amounts per frame index (offsets into frame.data):
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A5[0] (probe): data[strt_pos + 21 + 7] (skip header + STRT record)
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strt_pos found by searching frame.data[7:] for b'STRT';
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the contribution starts at strt_pos + 21 within data[7:]
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which equals strt_pos + 21 + 7 within frame.data.
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A5[1]: data[13] (skip 7-byte frame.data prefix + 6 header bytes)
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A5[2..N]: data[12] (skip 7-byte frame.data prefix + 5 header bytes)
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Terminator A5: data[11] (1 byte less than chunk frames; terminator inner header
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is 4 bytes instead of 5 — confirmed 2026-04-21)
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DLE strip rule (applied AFTER slicing):
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Strip any 0x10 byte that is immediately followed by 0x02, 0x03, or 0x04.
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This undoes the DLE-escape that S3FrameParser preserves as literal pairs.
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Applied to frame.data[skip:] + bytes([frame.chk_byte]) together, then
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conditionally exclude the trailing chk_byte from the output.
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chk_byte absorption:
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When frame.data[-1] == 0x10 AND frame.chk_byte ∈ {0x02, 0x03, 0x04},
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the last byte of frame.data is the DLE prefix of a split DLE+chk pair.
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Including chk_byte in the strip buffer allows the pair to be stripped as
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a unit. After stripping, the trailing chk_byte is ALWAYS removed — because
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_strip_inner_frame_dles keeps the byte after the DLE (the chk_byte value),
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and that value is the checksum, never payload. This applies to all three
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cases (chk ∈ {0x02, 0x03, 0x04}) identically.
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MLG CRC:
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The algorithm that produces the 2-byte CRC at the start of each MLG record
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is unknown. All examined records use non-zero values that do not match
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CRC-16/CCITT, CRC-16/IBM, CRC-32 (truncated), word sums, XOR variants, or
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any of the 40+ polynomial/init combinations tested. The writer emits 0x0000.
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This produces files that Blastware may reject or display without the CRC check —
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the exact impact on BW import is unknown (TODO: test).
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─── Public API ──────────────────────────────────────────────────────────────────
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blastware_filename(event, serial)
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Return the correct Blastware filename (e.g. "M529LIY6.N00") for an event.
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Uses event.record_type to pick .N00 (single-shot) vs .9T0 (continuous).
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write_n00(event, a5_frames, path)
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Create a .N00 or .9T0 waveform file from an Event and the full A5 frame
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list (include_terminator=True required when calling read_bulk_waveform_stream).
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Identical binary format for both extensions — caller picks the path/ext.
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read_n00(path) → Event
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Parse a .N00 file into an Event object with waveform data populated.
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(Not yet implemented — placeholder raises NotImplementedError.)
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write_mlg(entries, serial, path)
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Create a .MLG file from a list of MonitorLogEntry objects.
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read_mlg(path) → list[MonitorLogEntry]
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Parse a .MLG file into MonitorLogEntry objects.
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(Not yet implemented — placeholder raises NotImplementedError.)
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"""
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from __future__ import annotations
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import datetime
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import struct
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from pathlib import Path
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from typing import Optional, Union
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from .framing import S3Frame
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from .models import Event, MonitorLogEntry, Timestamp
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# ── File header constants ─────────────────────────────────────────────────────
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# Common 16-byte prefix shared by N00 and MLG (confirmed from binary inspection).
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_FILE_HEADER_PREFIX = bytes.fromhex("1000018000004973") + b"tantel\x00\x07\x2c"
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# = 10 00 01 80 00 00 49 73 74 61 6e 74 65 6c 00 07 2c (17 bytes)
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# Confirmed breakdown: 10 00 01 80 00 00 = fixed; "Instantel\x00" = 10B; 07 2c = fixed
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# Simpler construction:
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_FILE_HEADER_PREFIX = b"\x10\x00\x01\x80\x00\x00Instantel\x00\x07\x2c" # 17 bytes
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# N00 type tag (4 bytes after common prefix)
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_N00_TYPE_TAG = b"\x00\x12\x03\x00" # confirmed from M529LIY6.N00 offset 0x11..0x14
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# MLG type tag (4 bytes after common prefix)
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_MLG_TYPE_TAG = b"\x22\x01\x0e\xa0" # confirmed from BE11529.MLG offset 0x11..0x14
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# Total header sizes
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_N00_HEADER_SIZE = 22 # 17 + 4 = 21... wait. Let me recalculate.
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# From binary: first 22 bytes = header, then STRT at byte 22.
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# 17-byte common prefix + 4-byte type tag = 21 bytes. But observed header is 22B.
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# Checking: 6 fixed + 10 "Instantel\x00" + 2 "07 2c" = 18B prefix, then 4B type tag = 22B.
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# Re-count: b"\x10\x00\x01\x80\x00\x00" = 6B + b"Instantel\x00" = 10B + b"\x07\x2c" = 2B = 18B prefix.
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_FILE_HEADER_PREFIX = b"\x10\x00\x01\x80\x00\x00Instantel\x00\x07\x2c" # 18 bytes
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_N00_HEADER_SIZE = 22 # 18 + 4 = 22 bytes ✅
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_MLG_HEADER_SIZE = 308 # confirmed from BE11529.MLG
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# MLG record marker (4 bytes after 2-byte CRC at start of each record)
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_MLG_RECORD_MARKER = b"\x22\x01\x0e\x80"
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_MLG_RECORD_SIZE = 292 # bytes per record (confirmed from BE11529.MLG)
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# MLG record flags (4 bytes at record[22:26])
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# Confirmed from BE11529.MLG binary inspection:
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MLG_FLAGS_START_ONLY = b"\xff\xff\x00\x00" # monitoring start with no stop
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MLG_FLAGS_TRIGGER = b"\x01\x00\x02\x00" # triggered event (has ts1 + ts2)
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MLG_FLAGS_INTERVAL = b"\x02\x00\x00\x00" # monitoring interval (has ts1 + ts2)
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# ── Timestamp helpers ─────────────────────────────────────────────────────────
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def _encode_ts_be(ts: Optional[datetime.datetime]) -> bytes:
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"""
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Encode a datetime as an 8-byte big-endian Blastware timestamp.
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Format (N00 and MLG record timestamps):
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[day][month][year_HI][year_LO][0x00][hour][min][sec]
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Big-endian year confirmed from M529LIY6.N00 footer:
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footer bytes [2..9] = 01 04 07 ea 00 00 1c 08
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→ day=1 month=4 year=0x07ea=2026 hour=0 min=28 sec=8 ✅
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Returns 8 zero bytes if ts is None.
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"""
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if ts is None:
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return bytes(8)
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return bytes([
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ts.day,
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ts.month,
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(ts.year >> 8) & 0xFF,
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ts.year & 0xFF,
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0x00,
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ts.hour,
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ts.minute,
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ts.second,
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])
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def _decode_ts_be(raw: bytes) -> Optional[datetime.datetime]:
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"""
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Decode an 8-byte big-endian Blastware timestamp.
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Returns None if the bytes are all zero or structurally invalid.
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"""
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if len(raw) < 8 or raw == bytes(8):
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return None
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day = raw[0]
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month = raw[1]
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year = (raw[2] << 8) | raw[3]
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hour = raw[5]
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minute = raw[6]
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sec = raw[7]
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try:
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return datetime.datetime(year, month, day, hour, minute, sec)
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except ValueError:
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return None
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def _ts_from_model(ts: Optional[Timestamp]) -> Optional[datetime.datetime]:
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"""Convert a models.Timestamp to datetime.datetime, or None."""
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if ts is None:
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return None
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try:
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return datetime.datetime(ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.second)
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except (ValueError, TypeError):
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return None
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# ── DLE strip helper ──────────────────────────────────────────────────────────
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def _strip_inner_frame_dles(data: bytes) -> bytes:
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"""
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Strip DLE (0x10) framing markers from A5 inner-frame content.
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The A5 (bulk waveform stream) response body contains DLE-encoded sub-frame
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structure. S3FrameParser preserves DLE+XX pairs as two literal bytes in
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frame.data. Only the DLE marker byte needs to be removed; the following
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byte is actual payload content.
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Rule: when 0x10 is immediately followed by {0x02, 0x03, 0x04}, strip the
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0x10 (DLE marker) and keep the following byte as payload.
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Lone 0x10 bytes not followed by {0x02, 0x03, 0x04} are kept as-is.
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Confirmed correct by verifying reconstructed N00 body against M529LIY6.N00:
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- 0x10 0x02 in terminator → 0x02 kept ✓
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- 0x10 0x04 in terminator (month byte) → 0x04 kept ✓
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"""
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out = bytearray()
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i = 0
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while i < len(data):
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b = data[i]
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if b == 0x10 and i + 1 < len(data) and data[i + 1] in {0x02, 0x03, 0x04}:
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# Strip the DLE marker; the next byte is payload and will be appended
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# in the next loop iteration.
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i += 1
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continue
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out.append(b)
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i += 1
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return bytes(out)
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def _frame_body_bytes(frame: S3Frame, skip: int) -> bytes:
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"""
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Extract the N00 body contribution from one A5 S3Frame.
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The contribution is frame.data[skip:] with inner-frame DLE pairs stripped
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per _strip_inner_frame_dles(). The chk_byte is temporarily appended before
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stripping to handle the split-pair edge case where a DLE at the end of
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frame.data is paired with chk_byte.
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Split-pair edge case (confirmed for A5[8] of M529LIY6.N00, 2026-04-21):
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S3FrameParser appends DLE+XX pairs as two literal bytes when XX ∉ {DLE, ETX}.
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When the LAST occurrence of such a pair straddles the payload/checksum boundary
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(i.e., DLE is the last byte of raw_payload and XX is the checksum), the parser
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splits them:
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- DLE ends up as the last byte of frame.data (frame.data[-1] == 0x10)
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- XX is stored as frame.chk_byte
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To strip the pair correctly, we reunite the bytes before calling the strip
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function. Since chk_byte is the checksum (not payload data), it is excluded
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from the final output regardless of whether it was part of a pair.
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Post-strip chk_byte removal (ALL cases):
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_strip_inner_frame_dles strips the 0x10 and KEEPS chk_byte in all cases.
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Chk_byte is always the checksum (not payload), so always strip it off.
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Args:
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frame: S3Frame with frame.data and frame.chk_byte populated.
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skip: Number of leading bytes in frame.data to exclude (frame header).
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Returns:
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bytes — the N00 body contribution for this frame.
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"""
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if skip >= len(frame.data):
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return b""
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relevant = frame.data[skip:]
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# Detect split DLE+chk pair at the frame boundary.
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has_split_pair = (
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len(relevant) > 0
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and relevant[-1] == 0x10
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and frame.chk_byte in {0x02, 0x03, 0x04}
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)
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if has_split_pair:
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# Reunite the split pair so the strip function sees both bytes together.
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buf = relevant + bytes([frame.chk_byte])
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stripped = _strip_inner_frame_dles(buf)
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# _strip_inner_frame_dles strips the DLE (0x10) and KEEPS chk_byte.
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# chk_byte is the received checksum — never payload — so remove it.
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# This is correct for all values in {0x02, 0x03, 0x04}.
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if stripped:
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stripped = stripped[:-1]
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return stripped
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else:
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return _strip_inner_frame_dles(relevant)
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# ── Filename helper ───────────────────────────────────────────────────────────
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_INSTANTEL_EPOCH = datetime.datetime(1985, 1, 1, 0, 0, 0)
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"""
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Instantel timestamp epoch — January 1, 1985, 00:00:00 local time.
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Confirmed 2026-04-21: stem values for 6 independent events (April 1–9, 2026)
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all converge to this epoch when decoded as floor(seconds_since_epoch / 1296).
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1985 is the year Instantel was founded.
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"""
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_STEM_UNIT_SEC = 1296 # = 36^2 seconds ≈ 21.6 minutes per stem unit
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_STEM_CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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# Known waveform file extensions (third character is always '0' — confirmed from
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# observed files: .N00, .9T0, .490, .5K0, .980, .ML0).
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#
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# Confirmed mappings:
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# .N00 → single-shot (recording_mode=0 in compliance anchor at file[anc-7])
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# .9T0 → continuous (recording_mode=1 in compliance anchor at file[anc-7])
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# Unknown mappings (observed from M529LJDY.* and M529LJ8V.*):
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# .490 → ? (April 6, 13 sec record)
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# .5K0 → ? (April 9, 10 sec record)
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# .980 → ? (April 9, 7 sec record)
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# .ML0 → ? (April 9, 167 sec record — possibly Histogram or Histogram+Continuous)
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#
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# IMPORTANT — extension encodes capture-time config, NOT session-start config:
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# Binary analysis (2026-04-21) shows that the compliance anchor region in the
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# file body encodes the SESSION-START config (A5 frame 7), not the per-event
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# config. All 5 non-N00 example files show recording_mode=1 (Continuous) and
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# sample_rate=1024 in the body even though they carry 5 different extensions.
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# The extension must therefore be assigned by Blastware based on the device's
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# capture-time compliance state (read from the 0C record sub_code and sample
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# data), which is NOT preserved verbatim in the A5 body.
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#
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# How to READ recording_mode from a .N00/.9T0 body (DLE-strip offset note):
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# The logical compliance layout has a constant 0x10 at anchor−7 (between
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# recording_mode at anchor−8 and sample_rate_HI at anchor−6). When
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# sample_rate_HI = 0x04 (1024 sps), _strip_inner_frame_dles strips the 0x10
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# because it precedes 0x04 ∈ {0x02,0x03,0x04}. After stripping, the anchor
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# shifts one byte closer to start, so in the FILE:
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# file[anc−7] = recording_mode (logical anc−8, shifted)
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# file[anc−6] = sample_rate_HI (logical anc−6, was 0x04)
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# file[anc−5] = sample_rate_LO
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# file[anc−4] = histogram_interval_HI
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# file[anc−3] = histogram_interval_LO
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# For sample_rate ≠ 1024 (0x08 or 0x10 as HI byte), the 0x10 constant at
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# logical anc−7 is NOT stripped (since 0x08/0x10 ∉ {0x02,0x03,0x04}), so
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# recording_mode remains at file[anc−8] and sample_rate at file[anc−6:anc−4].
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#
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# Multiple events within the same ~21.6-minute window share a stem but get
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# different extensions, so extension encodes recording mode × sample rate (and
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# possibly mic units or other settings) at the time of capture.
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def _make_stem(ts_local: datetime.datetime) -> str:
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"""
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Encode a local timestamp as a 4-character uppercase base-36 stem.
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Algorithm (confirmed 2026-04-21 from 6 known file/timestamp pairs):
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stem_int = floor((ts_local - Jan_1_1985_midnight_local) / 1296_seconds)
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stem = 4-char uppercase base-36 encoding of stem_int
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Unit = 36² = 1296 seconds ≈ 21.6 minutes. Events within the same 1296-second
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window receive the same stem; their extension distinguishes them.
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"""
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delta_sec = int((ts_local - _INSTANTEL_EPOCH).total_seconds())
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n = delta_sec // _STEM_UNIT_SEC
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s = ""
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for _ in range(4):
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s = _STEM_CHARS[n % 36] + s
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n //= 36
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return s
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def blastware_filename(event: Event, serial: str) -> str:
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"""
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Return the correct Blastware waveform filename for an event.
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Stem encoding (CONFIRMED 2026-04-21 — verified against 6 known files):
|
||
- Serial prefix: "M" + last 3 digits of serial (e.g. "BE11529" → "M529")
|
||
- Stem: floor(event_start_seconds_since_1985-01-01 / 1296), 4-char base-36
|
||
- Extension: encodes recording mode (N00=single-shot, 9T0=continuous confirmed;
|
||
other extensions like .490, .5K0, .980, .ML0 observed but not decoded)
|
||
|
||
Note: the extension space is larger than N00/9T0. Multiple events within
|
||
the same ~21.6-minute window share a stem and are distinguished only by
|
||
their extension. This function returns .N00 or .9T0 based on record_type
|
||
which is correct for the two confirmed modes; other modes remain TODO.
|
||
|
||
Args:
|
||
event: Event object with record_type and timestamp set.
|
||
serial: Device serial number string (e.g. "BE11529").
|
||
|
||
Returns:
|
||
Filename string (e.g. "M529LIY6.N00").
|
||
"""
|
||
# Determine extension from record_type
|
||
if event.record_type == "continuous":
|
||
ext = ".9T0"
|
||
else:
|
||
# Default to .N00 for single-shot and unknown modes
|
||
ext = ".N00"
|
||
|
||
# Serial prefix: "M" + last 3 digits (e.g. BE11529 → M529)
|
||
serial_digits = "".join(c for c in serial if c.isdigit())
|
||
prefix = "M" + serial_digits[-3:] if len(serial_digits) >= 3 else "M000"
|
||
|
||
# Stem from event start timestamp
|
||
if event.timestamp is not None:
|
||
try:
|
||
ts_local = datetime.datetime(
|
||
event.timestamp.year, event.timestamp.month, event.timestamp.day,
|
||
event.timestamp.hour, event.timestamp.minute, event.timestamp.second,
|
||
)
|
||
stem = _make_stem(ts_local)
|
||
except (ValueError, TypeError, AttributeError):
|
||
stem = "0000"
|
||
else:
|
||
stem = "0000"
|
||
|
||
return prefix + stem + ext
|
||
|
||
|
||
# ── N00 file writer ───────────────────────────────────────────────────────────
|
||
|
||
def write_n00(
|
||
event: Event,
|
||
a5_frames: list[S3Frame],
|
||
path: Union[str, Path],
|
||
) -> None:
|
||
"""
|
||
Write a Blastware .N00 waveform file from a downloaded event.
|
||
|
||
Args:
|
||
event: Event object (populated by get_events() or download_waveform()).
|
||
Used for the STRT record (key, rectime) and footer timestamps.
|
||
a5_frames: Complete A5 frame list INCLUDING the terminator frame
|
||
(page_key=0x0000). Pass include_terminator=True to
|
||
read_bulk_waveform_stream() when collecting frames.
|
||
Must have at least 2 frames (probe + terminator).
|
||
path: Destination file path. Parent directory must exist.
|
||
Extension is not enforced — caller should use ".N00".
|
||
|
||
File layout:
|
||
[22B header] [21B STRT] [body bytes] [26B footer]
|
||
|
||
Raises:
|
||
ValueError: if a5_frames is empty or has no terminator (page_key=0).
|
||
OSError: if the file cannot be written.
|
||
|
||
Confirmed correct N00 body reconstruction against M529LIY6.N00 (2026-04-21).
|
||
"""
|
||
if not a5_frames:
|
||
raise ValueError("a5_frames must not be empty")
|
||
|
||
path = Path(path)
|
||
|
||
# ── Extract STRT record from probe frame ────────────────────────────────
|
||
# The STRT record (21 bytes) lives verbatim inside A5[0].data[7:].
|
||
# It is stored as-is in the N00 file — do NOT reconstruct it from Event
|
||
# fields, as bytes [10:14] and [14:20] contain device-specific values
|
||
# (not simply key4 repeated or zero-padded). Confirmed 2026-04-21.
|
||
#
|
||
# STRT layout (21 bytes, observed in M529LIY6.N00):
|
||
# [0:4] b'STRT'
|
||
# [4:6] 0xff 0xfe (fixed)
|
||
# [6:10] key4 (event key)
|
||
# [10:14] device-specific field (NOT a key4 repeat)
|
||
# [14:20] device-specific fields (NOT zeros)
|
||
# [20] rectime uint8 seconds
|
||
w0 = a5_frames[0].data[7:]
|
||
strt_pos_w0 = w0.find(b"STRT")
|
||
if strt_pos_w0 >= 0:
|
||
strt = bytes(w0[strt_pos_w0 : strt_pos_w0 + 21])
|
||
else:
|
||
# Fallback: construct a minimal STRT if probe frame lacks it
|
||
key4 = event._waveform_key if hasattr(event, '_waveform_key') and event._waveform_key else bytes(4)
|
||
rectime = event.rectime_seconds if event.rectime_seconds is not None else 0
|
||
strt = b"STRT" + b"\xff\xfe" + key4 + bytes(14) + bytes([rectime & 0xFF])
|
||
if len(strt) != 21:
|
||
raise ValueError(f"STRT record must be 21 bytes, got {len(strt)}")
|
||
|
||
strt_pos_in_w0 = strt_pos_w0 if strt_pos_w0 >= 0 else 0
|
||
|
||
# ── Build N00 header ─────────────────────────────────────────────────────
|
||
header = _FILE_HEADER_PREFIX + _N00_TYPE_TAG
|
||
assert len(header) == _N00_HEADER_SIZE, f"N00 header must be {_N00_HEADER_SIZE} bytes"
|
||
|
||
# ── Build body from A5 frames ────────────────────────────────────────────
|
||
# The N00 body is reconstructed from ALL A5 frames (data + terminator).
|
||
# The terminator frame's contribution includes the 26-byte footer at its end.
|
||
#
|
||
# Reconstruction layout (confirmed from M529LIY6.N00, 2026-04-21):
|
||
# all_bytes = contributions from A5[0..N] + terminator_contribution
|
||
# body = all_bytes[:-26] (everything except the last 26 bytes)
|
||
# footer = all_bytes[-26:] (last 26 bytes = the N00 footer)
|
||
#
|
||
# The footer bytes come directly from the terminator frame's inner content —
|
||
# using them verbatim ensures timestamps match the device's recorded values.
|
||
|
||
# Separate terminator from data frames
|
||
body_frames = a5_frames
|
||
term_frame: Optional[S3Frame] = None
|
||
if a5_frames and a5_frames[-1].page_key == 0x0000:
|
||
body_frames = a5_frames[:-1]
|
||
term_frame = a5_frames[-1]
|
||
|
||
# Skip for A5[0]: 7-byte frame.data prefix + strt_pos_in_w0 + 21 STRT bytes.
|
||
# strt_pos_in_w0 was already found in the STRT extraction block above.
|
||
probe_skip = 7 + strt_pos_in_w0 + 21
|
||
|
||
all_bytes = bytearray()
|
||
|
||
for fi, frame in enumerate(body_frames):
|
||
if fi == 0:
|
||
skip = probe_skip
|
||
elif fi == 1:
|
||
skip = 13 # 7-byte frame.data prefix + 6-byte first-chunk header
|
||
else:
|
||
skip = 12 # 7-byte frame.data prefix + 5-byte chunk header
|
||
all_bytes.extend(_frame_body_bytes(frame, skip))
|
||
|
||
# Terminator contributes its content, which ends with the 26-byte footer.
|
||
# skip=11 (not 12) because the terminator's inner frame header is 4 bytes,
|
||
# one shorter than chunk frames' 5-byte inner header. Confirmed 2026-04-21.
|
||
if term_frame is not None:
|
||
all_bytes.extend(_frame_body_bytes(term_frame, 11))
|
||
|
||
if len(all_bytes) >= 26:
|
||
body = bytes(all_bytes[:-26])
|
||
footer = bytes(all_bytes[-26:])
|
||
else:
|
||
# Fallback: no terminator or very short stream → build footer from event metadata
|
||
body = bytes(all_bytes)
|
||
start_dt = _ts_from_model(event.timestamp)
|
||
stop_dt: Optional[datetime.datetime] = None
|
||
if start_dt is not None and event.rectime_seconds:
|
||
stop_dt = start_dt + datetime.timedelta(seconds=event.rectime_seconds)
|
||
footer = (
|
||
b"\x0e\x08"
|
||
+ _encode_ts_be(start_dt)
|
||
+ _encode_ts_be(stop_dt)
|
||
+ b"\x00\x01\x00\x02\x00\x00"
|
||
+ b"\x00\x00" # CRC placeholder
|
||
)
|
||
|
||
# ── Write file ───────────────────────────────────────────────────────────
|
||
with open(path, "wb") as f:
|
||
f.write(header)
|
||
f.write(strt)
|
||
f.write(body)
|
||
f.write(footer)
|
||
|
||
|
||
def read_n00(path: Union[str, Path]) -> Event:
|
||
"""
|
||
Parse a Blastware .N00 file into an Event object.
|
||
|
||
NOT YET IMPLEMENTED.
|
||
|
||
Args:
|
||
path: Path to the .N00 file.
|
||
|
||
Returns:
|
||
Event object with waveform data populated.
|
||
|
||
Raises:
|
||
NotImplementedError: always (pending implementation).
|
||
"""
|
||
raise NotImplementedError("read_n00() is not yet implemented")
|
||
|
||
|
||
# ── MLG file writer ───────────────────────────────────────────────────────────
|
||
|
||
def _build_mlg_header(serial: str) -> bytes:
|
||
"""
|
||
Build the 308-byte MLG file header.
|
||
|
||
Header structure (confirmed from BE11529.MLG binary inspection):
|
||
Offset 0x00: 10 00 01 80 00 00 Instantel\x00 07 2c 22 01 0e a0 (22B)
|
||
Offset 0x16: ... (16B unknown — observed as zeros in BE11529.MLG)
|
||
Offset 0x2A: serial number (8 bytes, null-padded ASCII)
|
||
... rest zero-padded to 308 bytes
|
||
|
||
The serial string "BE11529" appears at offset 0x2A (42 decimal).
|
||
"""
|
||
buf = bytearray(_MLG_HEADER_SIZE)
|
||
|
||
# Common prefix + MLG type tag
|
||
prefix = _FILE_HEADER_PREFIX + _MLG_TYPE_TAG # 22 bytes
|
||
buf[0:len(prefix)] = prefix
|
||
|
||
# Serial number at offset 0x2A
|
||
serial_bytes = serial.encode("ascii", errors="replace")[:8]
|
||
serial_padded = serial_bytes.ljust(8, b"\x00")
|
||
buf[0x2A : 0x2A + 8] = serial_padded
|
||
|
||
return bytes(buf)
|
||
|
||
|
||
def _build_mlg_record(
|
||
entry: MonitorLogEntry,
|
||
serial: str,
|
||
) -> bytes:
|
||
"""
|
||
Build one 292-byte MLG record from a MonitorLogEntry.
|
||
|
||
Record layout (confirmed from BE11529.MLG binary inspection):
|
||
[0:2] CRC — 2-byte CRC (algorithm unknown; written as 0x0000)
|
||
[2:6] marker — 22 01 0e 80
|
||
[6:14] ts1 — 8B big-endian start timestamp
|
||
[14:22] ts2 — 8B big-endian stop timestamp
|
||
[22:26] flags — 4B record flags (see MLG_FLAGS_* constants)
|
||
[26:36] serial — 10B null-padded serial number
|
||
[36:] text — for triggered events: [0x08][8B ts1_copy]["Geo: X.XXX in/s"]
|
||
for monitoring intervals: b"" or minimal separator
|
||
[... zero-padded to 292 bytes]
|
||
|
||
Flags based on entry type:
|
||
- MonitorLogEntry with start_time only (no stop_time): MLG_FLAGS_START_ONLY
|
||
- MonitorLogEntry with both times and geo_threshold_ips set: MLG_FLAGS_TRIGGER
|
||
- MonitorLogEntry with both times (monitoring interval): MLG_FLAGS_INTERVAL
|
||
|
||
The triggered-event text block (flags = MLG_FLAGS_TRIGGER):
|
||
[0x08] [ts1: 8B] [ASCII "Geo: X.XXX in/s\x00"]
|
||
Confirmed from BE11529.MLG records at offset 0x0134 and 0x0258.
|
||
"""
|
||
buf = bytearray(_MLG_RECORD_SIZE)
|
||
|
||
start_dt = (
|
||
datetime.datetime(
|
||
entry.start_time.year, entry.start_time.month, entry.start_time.day,
|
||
entry.start_time.hour, entry.start_time.minute, entry.start_time.second,
|
||
)
|
||
if entry.start_time else None
|
||
)
|
||
stop_dt = (
|
||
datetime.datetime(
|
||
entry.stop_time.year, entry.stop_time.month, entry.stop_time.day,
|
||
entry.stop_time.hour, entry.stop_time.minute, entry.stop_time.second,
|
||
)
|
||
if entry.stop_time else None
|
||
)
|
||
|
||
# [0:2] CRC placeholder
|
||
buf[0:2] = b"\x00\x00"
|
||
|
||
# [2:6] Record marker
|
||
buf[2:6] = _MLG_RECORD_MARKER
|
||
|
||
# [6:14] ts1
|
||
buf[6:14] = _encode_ts_be(start_dt)
|
||
|
||
# [14:22] ts2
|
||
buf[14:22] = _encode_ts_be(stop_dt)
|
||
|
||
# [22:26] flags
|
||
if stop_dt is None:
|
||
flags = MLG_FLAGS_START_ONLY
|
||
elif entry.geo_threshold_ips is not None:
|
||
flags = MLG_FLAGS_TRIGGER
|
||
else:
|
||
flags = MLG_FLAGS_INTERVAL
|
||
buf[22:26] = flags
|
||
|
||
# [26:36] serial (10B null-padded)
|
||
serial_bytes = serial.encode("ascii", errors="replace")[:10]
|
||
buf[26 : 26 + len(serial_bytes)] = serial_bytes
|
||
|
||
# [36:] text content
|
||
pos = 36
|
||
if flags == MLG_FLAGS_TRIGGER:
|
||
# Extra ts1 copy: [0x08][ts1: 8B]
|
||
buf[pos] = 0x08
|
||
pos += 1
|
||
buf[pos : pos + 8] = _encode_ts_be(start_dt)
|
||
pos += 8
|
||
|
||
if entry.geo_threshold_ips is not None:
|
||
geo_text = f"Geo: {entry.geo_threshold_ips:.3f} in/s\x00".encode("ascii")
|
||
buf[pos : pos + len(geo_text)] = geo_text
|
||
pos += len(geo_text)
|
||
|
||
return bytes(buf)
|
||
|
||
|
||
def write_mlg(
|
||
entries: list[MonitorLogEntry],
|
||
serial: str,
|
||
path: Union[str, Path],
|
||
) -> None:
|
||
"""
|
||
Write a Blastware .MLG monitor log file.
|
||
|
||
Args:
|
||
entries: List of MonitorLogEntry objects (from get_monitor_log_entries()).
|
||
Each entry produces one 292-byte record in the file.
|
||
serial: Device serial number string (e.g. "BE11529").
|
||
Written to the file header and each record.
|
||
path: Destination file path. Extension is not enforced — use ".MLG".
|
||
|
||
File layout:
|
||
[308B header] [N × 292B records]
|
||
|
||
Note: The 2-byte CRC at the start of each record is written as 0x0000.
|
||
The CRC algorithm is unknown (see module docstring).
|
||
|
||
Raises:
|
||
OSError: if the file cannot be written.
|
||
"""
|
||
path = Path(path)
|
||
header = _build_mlg_header(serial)
|
||
|
||
with open(path, "wb") as f:
|
||
f.write(header)
|
||
for entry in entries:
|
||
record = _build_mlg_record(entry, serial)
|
||
f.write(record)
|
||
|
||
|
||
def read_mlg(path: Union[str, Path]) -> list[MonitorLogEntry]:
|
||
"""
|
||
Parse a Blastware .MLG file into a list of MonitorLogEntry objects.
|
||
|
||
NOT YET IMPLEMENTED.
|
||
|
||
Args:
|
||
path: Path to the .MLG file.
|
||
|
||
Returns:
|
||
List of MonitorLogEntry objects.
|
||
|
||
Raises:
|
||
NotImplementedError: always (pending implementation).
|
||
"""
|
||
raise NotImplementedError("read_mlg() is not yet implemented")
|