old_len = int.from_bytes(f_patch.read(8), 'little') new_len = int.from_bytes(f_patch.read(8), 'little')
This method minimizes bandwidth (patches are often kilobytes rather than megabytes or gigabytes) and avoids the distribution of copyrighted material by the modder. xdeltapatcher
# Reconstruct new data new_data = bytearray() while len(new_data) < new_len: opcode = f_patch.read(1) if not opcode: break old_len = int
print(f"Patch created: patch_file") print(f"Operations: len(patch_ops)") old_len = int.from_bytes(f_patch.read(8)
This is a version, but it captures the core idea of xdelta-style binary patching .
else: raise ValueError("Unknown opcode in patch")
Click the "..." button or the folder icon next to Output File . Choose a location and name for the new patched file (e.g., GameName_Modded.iso ).