101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
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/* 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SCI_ENGINE_SCRIPT_PATCHES_H
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#define SCI_ENGINE_SCRIPT_PATCHES_H
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#include "sci/sci.h"
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namespace Sci {
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#define SIG_END 0xFFFF
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#define SIG_MISMATCH 0xFFFE
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#define SIG_COMMANDMASK 0xF000
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#define SIG_VALUEMASK 0x0FFF
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#define SIG_BYTEMASK 0x00FF
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#define SIG_MAGICDWORD 0xF000
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#define SIG_ADDTOOFFSET 0xE000
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#define SIG_SELECTOR16 0x9000
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#define SIG_SELECTOR8 0x8000
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#define SIG_UINT16 0x1000
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#define SIG_BYTE 0x0000
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#define PATCH_END SIG_END
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#define PATCH_COMMANDMASK SIG_COMMANDMASK
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#define PATCH_VALUEMASK SIG_VALUEMASK
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#define PATCH_BYTEMASK SIG_BYTEMASK
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#define PATCH_ADDTOOFFSET SIG_ADDTOOFFSET
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#define PATCH_GETORIGINALBYTE 0xD000
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#define PATCH_GETORIGINALBYTEADJUST 0xC000
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#define PATCH_SELECTOR16 SIG_SELECTOR16
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#define PATCH_SELECTOR8 SIG_SELECTOR8
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#define PATCH_UINT16 SIG_UINT16
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#define PATCH_BYTE SIG_BYTE
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// defines maximum scratch area for getting original bytes from unpatched script data
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#define PATCH_VALUELIMIT 4096
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struct SciScriptPatcherEntry {
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bool defaultActive;
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// bool active;
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uint16 scriptNr;
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const char *description;
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int16 applyCount;
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// uint32 magicDWord;
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// int magicOffset;
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const uint16 *signatureData;
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const uint16 *patchData;
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};
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//#define SCI_SIGNATUREENTRY_TERMINATOR { false, 0, NULL, 0, 0, 0, NULL, NULL }
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#define SCI_SIGNATUREENTRY_TERMINATOR { false, 0, NULL, 0, NULL, NULL }
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struct SciScriptPatcherRuntimeEntry {
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bool active;
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uint32 magicDWord;
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int magicOffset;
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};
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/**
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* ScriptPatcher class, handles on-the-fly patching of script data
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*/
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class ScriptPatcher {
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public:
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ScriptPatcher();
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~ScriptPatcher();
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void processScript(uint16 scriptNr, byte *scriptData, const uint32 scriptSize);
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private:
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void initSignature(SciScriptPatcherEntry *patchTable, bool isMacSci11);
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void enablePatch(SciScriptPatcherEntry *patchTable, const char *searchDescription);
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int32 findSignature(const SciScriptPatcherEntry *patchEntry, SciScriptPatcherRuntimeEntry *runtimeEntry, const byte *scriptData, const uint32 scriptSize, bool isMacSci11);
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void applyPatch(const SciScriptPatcherEntry *patchEntry, byte *scriptData, const uint32 scriptSize, int32 signatureOffset, bool isMacSci11);
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Selector *_selectorIdTable;
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SciScriptPatcherRuntimeEntry *_runtimeTable;
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};
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} // End of namespace Sci
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#endif // SCI_ENGINE_WORKAROUNDS_H
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