v0.4.0: polish — backup confirmation dialog, migration log fix

scan_props.py

@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+"""Dump specific property values from GVAS files with debug."""
+import struct, sys, os
+
+data = open(sys.argv[1], 'rb').read()
+
+def read_u32_at(off):
+    if off + 4 > len(data): return None
+    return struct.unpack_from('<I', data, off)[0]
+
+def read_fname_at(off):
+    slen = read_u32_at(off)
+    if slen is None: return (None, off)
+    if slen == 0: return (None, off + 4)
+    s = data[off+4:off+4+slen-1].decode('utf-8', errors='replace')
+    return (s, off + 4 + slen)
+
+targets = [
+    ('SlotName', 'StrProperty'),
+    ('DisplayName', 'StrProperty'),
+    ('HostAddress', 'StrProperty'),
+    ('HostPort', 'IntProperty'),
+    ('bIsMultiplayerSave', 'BoolProperty'),
+    ('bWasMultiplayerSave', 'BoolProperty'),
+    ('bOnlineSave', 'BoolProperty'),
+    ('bIsUserCreated', 'BoolProperty'),
+    ('LevelName', 'StrProperty'),
+    ('ModeSwitchCount', 'IntProperty'),
+    ('PlayTime', 'DoubleProperty'),
+]
+
+print(f"── {os.path.basename(sys.argv[1])} ──")
+
+for prop_name, type_name in targets:
+    target = prop_name.encode('utf-8')
+    offset = 0
+    found_val = None
+    attempts = 0
+    while offset < len(data) - 20 and attempts < 500:
+        pos = data.find(target, offset)
+        if pos < 0: break
+        if pos < 4:
+            offset = pos + 1; attempts += 1; continue
+        # Try len(target) + 1 or len(target) (with or without null)
+        name_len = read_u32_at(pos - 4)
+        if name_len is None or (name_len != len(target) + 1 and name_len != len(target)):
+            offset = pos + 1; attempts += 1; continue
+        if data[pos + len(target)] != 0:
+            offset = pos + 1; attempts += 1; continue
+        after_name = pos + len(target) + 1
+        (next_name, next_offset) = read_fname_at(after_name)
+        if next_name != type_name:
+            offset = pos + 1; attempts += 1; continue
+        # Extract value
+        if type_name == 'BoolProperty':
+            voff = next_offset + 9
+            if voff < len(data):
+                found_val = 'yes' if data[voff] != 0 else 'no'
+        elif type_name == 'IntProperty':
+            voff = next_offset + 9
+            if voff + 4 <= len(data):
+                found_val = struct.unpack_from('<i', data, voff)[0]
+        elif type_name == 'StrProperty':
+            slen = read_u32_at(next_offset + 5)
+            if slen is not None and slen > 0:
+                found_val = data[next_offset+9:next_offset+9+slen-1].decode('utf-8', errors='replace')
+            elif slen == 1:
+                found_val = '(empty)'
+        elif type_name == 'DoubleProperty':
+            voff = next_offset + 5
+            if voff + 8 <= len(data):
+                v = struct.unpack_from('<d', data, voff)[0]
+                found_val = f'{v:.0f}s ({v/3600:.1f}h)'
+        break
+    
+    if found_val is not None:
+        print(f"  {prop_name:24}  {found_val}")