Add some code to be able to read inputs from a text file

other/extract_snapshot_log.py

@@ -0,0 +1,48 @@
+import struct
+import sys
+
+data = open(sys.argv[1], 'rb').read()
+
+ver, total_frames, log_size, last_inputs = struct.unpack_from('IIII', data)
+
+log = data[32:32+log_size]
+
+KEYS = "AXsSUDLRBY"
+
+keys_memo = {}
+def get_keys(i):
+  if i not in keys_memo:
+    keys_memo[i] = "".join(k for j, k in enumerate(KEYS) if i & (1 << j))
+  return keys_memo[i]
+
+frame_ctr = 0
+bb = iter(log)
+
+try:
+  while True:
+    cmd = bb.__next__()
+    mask = 0xf if cmd < 0xc0 else 1
+    frames = cmd & mask
+    if frames == mask:
+      while True:
+        t = bb.__next__()
+        frames += t
+        if t != 255:
+          break
+    frame_ctr += frames
+    if cmd < 0xc0:
+      last_inputs ^= 1 << (cmd >> 4)
+      print('%d: %s' % (frame_ctr, get_keys(last_inputs)))
+    elif cmd < 0xd0:
+      nb = 1 + ((cmd >> 2) & 3)
+      addr = ((cmd >> 1) & 1) << 16
+      addr |= bb.__next__() << 8
+      addr |= bb.__next__()
+      for i in range(nb):
+        bb.__next__()
+      print('%d: patchbytes(0x%x)' % (frame_ctr, addr))
+    else:
+      assert 0
+except StopIteration:
+  pass
+