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8cc72754d7
This is a follow up to fix #13139 and #14987. All saves created with the faulty patch get contaminated so we decontaminate them at load time by applying a minimized fixup. This will avoid players to restart a game from scratch and any game saved again will get this fix.
49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#define FORBIDDEN_SYMBOL_EXCEPTION_setjmp
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#define FORBIDDEN_SYMBOL_EXCEPTION_longjmp
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#include "engines/grim/lua/lstate.h"
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#include "engines/grim/lua/lua.h"
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namespace Grim {
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void lua_PatchGrimSave() {
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// Since ResidualVM 0.2.0, a ResidualVM/ScummVM specific patch was provided broken.
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// We patch here the code to fix all saves containing this invalid code.
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// cf. bug #13139 and #14987
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// The patch here doesn't match exactly the fixed patch.
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// We minimize here the number of bytes to patch with an equivalent result.
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TProtoFunc *tempProtoFunc = (TProtoFunc *)rootproto.next;
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while (tempProtoFunc) {
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if ((tempProtoFunc->lineDefined == 77) &&
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(strcmp(tempProtoFunc->fileName->str, "Scripts\\vd.lua") == 0) &&
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(memcmp(tempProtoFunc->code + 210, "\x22\x29\x39\x03\x32\x22\x30\x79\x02", 9) == 0)) {
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tempProtoFunc->code[211] = 0x33;
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tempProtoFunc->code[218] = 0x03;
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break;
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}
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tempProtoFunc = (TProtoFunc *)tempProtoFunc->head.next;
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}
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}
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} // end of namespace Grim
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