mirror of
https://github.com/libretro/scummvm.git
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91 lines
2.3 KiB
C++
91 lines
2.3 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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* Additional copyright for this file:
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* Copyright (C) 1999-2000 Revolution Software Ltd.
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* This code is based on source code created by Revolution Software,
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* used with permission.
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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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#include "engines/icb/common/px_common.h"
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#include "engines/icb/common/ptr_util.h"
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#include "common/array.h"
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namespace ICB {
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Common::Array<PointerReference> *g_ptrArray;
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namespace MemoryUtil {
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const int32 PTR_ARRAY_MAX(1024);
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uint32 encodePtr(uint8 *ptr) {
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PointerReference ptrRef;
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ptrdiff_t diff = ptr - (uint8 *)nullptr;
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ptrRef.ref = (uint32)(diff & 0xFFFFFFFF);
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ptrRef.ptr = ptr;
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// find free slot
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for (Common::Array<PointerReference>::iterator it = g_ptrArray->begin(); it < g_ptrArray->end(); it++) {
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if (it->ref == 0) {
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*it = ptrRef; // store
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return ptrRef.ref;
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}
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}
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// append
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g_ptrArray->push_back(ptrRef);
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if (g_ptrArray->size() >= (uint)PTR_ARRAY_MAX) {
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error("MemoryUtil::encodePtr(): too many pointers (MAX = %u)\n", PTR_ARRAY_MAX);
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}
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return ptrRef.ref;
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}
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uint8 *resolvePtr(uint32 ref) {
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if (ref == 0)
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return nullptr;
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// do a linear search
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for (Common::Array<PointerReference>::iterator it = g_ptrArray->begin(); it < g_ptrArray->end(); it++) {
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if (it->ref == ref) {
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uint8 *ptr = it->ptr;
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// purge
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it->ref = 0;
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it->ptr = nullptr;
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return ptr;
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}
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}
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error("MemoryUtil::resolvePtr(%08x) COULD NOT RESOLVE POINTER!\n", ref);
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return nullptr;
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}
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void clearAllPtrs(void) { g_ptrArray->clear(); }
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}
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} // End of namespace ICB
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