OSX-KVM - March 2021 - Batch Update 1

Changes:

- Upgrade to OpenCore 0.6.7-RELEASE

- Big Sur image building script updates (Nick)
  - See https://github.com/kholia/OSX-KVM/pull/169 for details.

- Removed history to reduce repository size

resources/idadif.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+
+# Small IDA .dif patcher - https://stalkr.net/files/ida/idadif.py
+
+import re
+from sys import argv,exit
+
+def patch(file, dif, revert=False):
+	code = open(file,'rb').read()
+	dif = open(dif,'r').read()
+	m = re.findall('([0-9a-fA-F]+): ([0-9a-fA-F]+) ([0-9a-fA-F]+)', dif)
+	for offset,orig,new in m:
+		o, orig, new = int(offset,16), orig.decode('hex'), new.decode('hex')
+		if revert:
+			if code[o]==new:
+				code = code[:o]+orig+code[o+1:]
+			else:
+				raise Exception("patched byte at %s is not %02X" % (offset, ord(new)))
+		else:
+			if code[o]==orig:
+				code = code[:o]+new+code[o+1:]
+			else:
+				raise Exception("original byte at %s is not %02X" % (offset, ord(orig)))
+	open(file,'wb').write(code)
+
+def main():
+	if len(argv)<3:
+		print("Usage: %s <binary> <IDA.dif file> [revert]" % (argv[0]))
+		print("Applies given IDA .dif file to patch binary; use revert to revert patch.")
+		exit(0)
+
+	file, dif, revert = argv[1], argv[2], False
+	if len(argv)>3:
+		revert = True
+		print("Reverting patch %r on file %r" % (dif, file))
+	else:
+		print("Patching file %r with %r" % (file, dif))
+
+	try:
+		patch(file, dif, revert)
+		print("Done")
+	except Exception as e:
+		print("Error: %s" % str(e))
+		exit(1)
+
+if __name__ == "__main__":
+	main()