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97 lines
2.4 KiB
C++
97 lines
2.4 KiB
C++
/* ResidualVM - A 3D game interpreter
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*
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* ResidualVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the AUTHORS
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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
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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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*
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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, 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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#include "engines/icb/common/px_common.h"
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#include "common/array.h"
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namespace ICB {
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namespace MemoryUtil {
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const int PTR_ARRAY_MAX(1024);
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// map pointers to 32-bit references (bottom 32-bits of address)
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struct PointerReference {
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uint32 ref;
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uint8 *ptr;
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};
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Common::Array<PointerReference> ptrArray;
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uint32 encodePtr(uint8 *ptr) {
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PointerReference ptrRef;
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ptrdiff_t diff = ptr - (uint8 *)0;
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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 = ptrArray.begin(); it < 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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ptrArray.push_back(ptrRef);
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if (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 NULL;
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// do a linear search
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for (Common::Array<PointerReference>::iterator it = ptrArray.begin(); it < 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 = 0;
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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 NULL;
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}
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void clearAllPtrs(void) { ptrArray.clear(); }
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}
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} // End of namespace ICB
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