Various fixes for patch 4

Analysis/alterlib/alterlib.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python
+
+import os, sys, io, collections, struct, unix_ar
+LuaObject = collections.namedtuple('LuaObject', ['info', 'contents'])
+
+if input("Have you made sure you verified that FileUtils::CFileToLua is compatible with the new lua51.lib file? (y/n) ") != 'y':
+    exit()
+
+# Open lua lib in read mode
+lua_lib = unix_ar.open(sys.argv[1], mode = "r")
+
+# Get contents of io library
+lua_objects = []
+for entry in lua_lib.infolist():
+    current_index = len(lua_objects)
+    lua_objects.append(LuaObject(entry, lua_lib.extract(entry, path=io.BytesIO()).read()))
+    if entry.name.strip(b"/").decode('iso-8859-1') == "lib_io.obj":
+        io_lib_index = current_index
+
+# Close lua lib
+lua_lib.close()
+
+# Get io object file
+io_lib = bytearray(lua_objects[io_lib_index].contents)
+
+# Get address of string table
+symbolTableAddr, = struct.unpack_from("<I", io_lib, 8)
+numberOfSymbols, = struct.unpack_from("<I", io_lib, 12)
+stringTableAddr = symbolTableAddr + numberOfSymbols * 18
+
+# Find function name offset relative to the string table
+functionStringAddr = io_lib.find(b"_io_std_new", stringTableAddr)
+assert functionStringAddr >= 0, 'String "_io_std_new" was not found'
+functionStringOffset = functionStringAddr - stringTableAddr
+assert functionStringOffset >= 0, 'String "_io_std_new" is outside of the string table'
+
+# Search address of symbol table entry
+for symbolIndex in range(numberOfSymbols):
+    symbolAddr = symbolTableAddr + symbolIndex * 18
+    mustBeZero, = struct.unpack_from("<I", io_lib, symbolAddr)
+    symbolNameOffset, = struct.unpack_from("<I", io_lib, symbolAddr + 4)
+    if mustBeZero == 0 and symbolNameOffset == functionStringOffset:
+        functionSymbolAddr = symbolAddr
+        break
+
+else:
+    assert False, "Symbol _io_std_new was not found"
+
+# Make symbol global
+io_lib[functionSymbolAddr + 16] = 0x2
+
+# Update contents
+lua_objects[io_lib_index] = LuaObject(lua_objects[io_lib_index].info, bytes(io_lib))
+
+# Backup old lua lib
+os.rename(sys.argv[1], sys.argv[1] + ".old")
+
+# Open lua lib in write mode
+lua_lib = unix_ar.open(sys.argv[1], mode = "w")
+
+# Add all files to archive
+for entry in lua_objects:
+    lua_lib.addfile(entry.info, io.BytesIO(entry.contents))
+
+# Close new lua lib
+lua_lib.close()
+
+print("Done!")
+
+
+