minimateplus/blastware_file.py

@@ -672,10 +672,7 @@ def write_blastware_file(
     # Do NOT use a5_frames[-1] — if _a5_frames contains stray frames from a
     # subsequent event (a known get_events side-effect), the last frame will
     # not be the terminator and the footer will be mis-identified.
-    # TERM detection (v0.14.0):
-    # Legacy walk: TERM has page_key == 0x0000.
-    # BW-exact walk: TERM has page_key != 0x0010 (e.g. 0x0001).
-    # The TERM is always the LAST frame in the list (include_terminator=True).
+    # TERM detection (v0.14.0): last frame if page_key != 0x0010 (sample marker)
     term_idx: Optional[int] = None
     if a5_frames and a5_frames[-1].page_key != 0x0010:
         term_idx = len(a5_frames) - 1
@@ -688,13 +685,8 @@ def write_blastware_file(
         term_frame  = None
 
     # Frame contribution loop (v0.14.0 BW-exact walk).
-    # Frame structure:
-    #   Event 1:  [probe]  [meta@0x1002]  [meta@0x1004]  [samples ...]  [TERM-not-in-body]
-    #   Event N:  [probe@start+0x46]  [samples ...]  [TERM-not-in-body]
-    #
-    # Skip values per frame (confirmed from byte-diff vs BW-saved file
-    # M529LKIQ.G10):
-    #   probe (fi=0):           probe_skip (depends on STRT position)
+    # Skip values:
+    #   probe (fi=0):           probe_skip
     #   meta@0x1002 (fi=1):     13 (6-byte inner header)
     #   meta@0x1004 (fi=2):     13 (6-byte inner header)
     #   sample chunks (fi=3+):  12 (5-byte inner header)
@@ -740,10 +732,26 @@ def write_blastware_file(
         bytes(all_bytes[-28:]).hex() if len(all_bytes) >= 28 else bytes(all_bytes).hex(),
     )
 
-    # Find the first valid 0e 08 footer marker (v0.14.0).  The device's
-    # TERM response contains the real Blastware footer; older walks
-    # accidentally fetched data past the footer.  Validate by checking the
-    # year field (uint16 BE at offset+4) is in 2015..2050.
+    # Strip embedded "duplicate header+STRT" blocks from body (v0.14.1).
+    # Chunk@0x1000 sometimes lands on the device's metadata-mirror page,
+    # whose response includes a 25-byte "00 12 03 00 STRT ..." block that
+    # mirrors the file's own header + STRT record.  BW treats embedded STRT
+    # markers as second-event starts and rejects the file.  Replace these
+    # blocks with zeros to preserve file size + alignment.
+    needle = b"\x00\x12\x03\x00STRT"
+    pos = bytes(all_bytes).find(needle)
+    while pos >= 0:
+        end = pos + 25
+        if end <= len(all_bytes):
+            all_bytes[pos:end] = b"\x00" * 25
+            log.warning(
+                "write_blastware_file: stripped duplicate header+STRT at "
+                "all_bytes[%d:%d] (replaced with 25 zero-bytes)",
+                pos, end,
+            )
+        pos = bytes(all_bytes).find(needle, end)
+
+    # Find the first valid 0e 08 footer marker (v0.14.0).
     footer_pos = -1
     pos = 0
     while True: