mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-27 04:07:05 +00:00
375 lines
8.6 KiB
C++
375 lines
8.6 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
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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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* $URL$
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* $Id$
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*
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*/
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#include "common/endian.h"
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#include "gob/gob.h"
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#include "gob/variables.h"
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#include "gob/helper.h"
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namespace Gob {
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Variables::Variables(uint32 size) {
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_size = size;
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_vars = new byte[_size];
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_sizes = new byte[_size];
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clear();
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}
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Variables::~Variables() {
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delete[] _vars;
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delete[] _sizes;
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}
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uint32 Variables::getSize() const {
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return _size;
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}
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void Variables::clear() {
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memset(_vars, 0, _size);
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// All variables are 32 bit wide per default
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memset(_sizes, 0, _size);
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for (uint32 i = 0; i < _size; i += 4)
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_sizes[i] = kSize32;
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}
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void Variables::clearSize(uint32 offset) {
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uint32 inVar = offset % 4;
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uint32 varOff = (offset >> 2) << 2;
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// Clearing out the old size
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for (uint32 i = 0; i < 4; i++) {
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if (_sizes[varOff + i] == kSize32)
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_sizes[varOff + i] = kSize8;
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else if ((inVar == (i + 1)) && (_sizes[varOff + i] == kSize16))
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_sizes[varOff + i] = kSize8;
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}
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}
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void Variables::writeSize(uint32 offset, byte n) {
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clearSize(offset);
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_sizes[offset] = n;
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// Setting following bytes of size to 8 bit, for easy clearing out afterwards
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for (; n > 0; n--)
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_sizes[offset + n] = kSize8;
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}
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void Variables::writeSizeString(uint32 offset, uint32 length) {
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clearSize(offset);
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memset(_sizes + offset, kSize8, length);
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}
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void Variables::writeVar8(uint32 var, uint8 value) {
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writeOff8(var * 4, value);
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}
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void Variables::writeVar16(uint32 var, uint16 value) {
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writeOff16(var * 4, value);
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}
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void Variables::writeVar32(uint32 var, uint32 value) {
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writeOff32(var * 4, value);
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}
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void Variables::writeVarString(uint32 var, const char *value) {
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writeOffString(var * 4, value);
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}
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void Variables::writeOff8(uint32 offset, uint8 value) {
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write8(_vars + offset, value);
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writeSize(offset, kSize8);
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}
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void Variables::writeOff16(uint32 offset, uint16 value) {
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write16(_vars + offset, value);
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writeSize(offset, kSize16);
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}
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void Variables::writeOff32(uint32 offset, uint32 value) {
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write32(_vars + offset, value);
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writeSize(offset, kSize32);
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}
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void Variables::writeOffString(uint32 offset, const char *value) {
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strcpy((char *) (_vars + offset), value);
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writeSizeString(offset, strlen(value));
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}
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uint8 Variables::readVar8(uint32 var) const {
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return readOff8(var * 4);
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}
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uint16 Variables::readVar16(uint32 var) const {
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return readOff16(var * 4);
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}
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uint32 Variables::readVar32(uint32 var) const {
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return readOff32(var * 4);
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}
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void Variables::readVarString(uint32 var, char *value, uint32 length) {
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readOffString(var * 4, value, length);
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}
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uint8 Variables::readOff8(uint32 offset) const {
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return read8(_vars + offset);
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}
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uint16 Variables::readOff16(uint32 offset) const {
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return read16(_vars + offset);
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}
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uint32 Variables::readOff32(uint32 offset) const {
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return read32(_vars + offset);
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}
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void Variables::readOffString(uint32 offset, char *value, uint32 length) {
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strncpy0(value, (const char *) (_vars + offset), length - 1);
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}
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const uint8 *Variables::getAddressVar8(uint32 var) const {
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return getAddressOff8(var * 4);
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}
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uint8 *Variables::getAddressVar8(uint32 var, uint32 n) {
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return getAddressOff8(var * 4, n);
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}
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const uint16 *Variables::getAddressVar16(uint32 var) const {
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return getAddressOff16(var * 4);
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}
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uint16 *Variables::getAddressVar16(uint32 var, uint32 n) {
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return getAddressOff16(var * 4, n);
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}
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const uint32 *Variables::getAddressVar32(uint32 var) const {
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return getAddressOff32(var * 4);
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}
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uint32 *Variables::getAddressVar32(uint32 var, uint32 n) {
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return getAddressOff32(var * 4, n);
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}
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const char *Variables::getAddressVarString(uint32 var) const {
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return getAddressOffString(var * 4);
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}
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char *Variables::getAddressVarString(uint32 var, uint32 n) {
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return getAddressOffString(var * 4, n);
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}
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const uint8 *Variables::getAddressOff8(uint32 offset) const {
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return ((const uint8 *) (_vars + offset));
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}
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uint8 *Variables::getAddressOff8(uint32 offset, uint32 n) {
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for (uint32 i = 0; i < n; i++)
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writeSize(offset + i, kSize8);
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return ((uint8 *) (_vars + offset));
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}
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const uint16 *Variables::getAddressOff16(uint32 offset) const {
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return ((const uint16 *) (_vars + offset));
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}
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uint16 *Variables::getAddressOff16(uint32 offset, uint32 n) {
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for (uint32 i = 0; i < n; i++)
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writeSize(offset + i * 2, kSize16);
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return ((uint16 *) (_vars + offset));
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}
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const uint32 *Variables::getAddressOff32(uint32 offset) const {
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return ((const uint32 *) (_vars + offset));
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}
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uint32 *Variables::getAddressOff32(uint32 offset, uint32 n) {
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for (uint32 i = 0; i < n; i++)
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writeSize(offset + i * 4, kSize32);
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return ((uint32 *) (_vars + offset));
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}
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const char *Variables::getAddressOffString(uint32 offset) const {
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return ((const char *) (_vars + offset));
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}
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char *Variables::getAddressOffString(uint32 offset, uint32 n) {
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writeSizeString(offset, (n == 0xFFFFFFFF) ? strlen((char *) (_vars + offset)) : n);
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return ((char *) (_vars + offset));
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}
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bool Variables::copyTo(uint32 offset, byte *variables, byte *sizes, uint32 n) const {
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if ((offset + n) > _size)
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return false;
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if (variables)
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memcpy(variables, _vars + offset, n);
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if (sizes)
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memcpy(sizes, _sizes + offset, n);
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return true;
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}
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bool Variables::copyFrom(uint32 offset, const byte *variables, const byte *sizes, uint32 n) {
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if (((offset + n) > _size) || !variables || !sizes)
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return false;
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memcpy(_vars + offset, variables, n);
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memcpy(_sizes + offset, sizes, n);
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return true;
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}
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VariablesLE::VariablesLE(uint32 size) : Variables(size) {
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}
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VariablesLE::~VariablesLE() {
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}
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void VariablesLE::write8(byte *buf, uint8 data) const {
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*buf = (byte) data;
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}
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void VariablesLE::write16(byte *buf, uint16 data) const {
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WRITE_LE_UINT16(buf, data);
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}
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void VariablesLE::write32(byte *buf, uint32 data) const {
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WRITE_LE_UINT32(buf, data);
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}
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uint8 VariablesLE::read8(const byte *buf) const {
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return (uint8) *buf;
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}
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uint16 VariablesLE::read16(const byte *buf) const {
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return READ_LE_UINT16(buf);
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}
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uint32 VariablesLE::read32(const byte *buf) const {
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return READ_LE_UINT32(buf);
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}
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VariablesBE::VariablesBE(uint32 size) : Variables(size) {
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}
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VariablesBE::~VariablesBE() {
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}
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void VariablesBE::write8(byte *buf, uint8 data) const {
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*buf = (byte) data;
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}
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void VariablesBE::write16(byte *buf, uint16 data) const {
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WRITE_BE_UINT16(buf, data);
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}
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void VariablesBE::write32(byte *buf, uint32 data) const {
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WRITE_BE_UINT32(buf, data);
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}
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uint8 VariablesBE::read8(const byte *buf) const {
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return (uint8) *buf;
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}
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uint16 VariablesBE::read16(const byte *buf) const {
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return READ_BE_UINT16(buf);
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}
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uint32 VariablesBE::read32(const byte *buf) const {
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return READ_BE_UINT32(buf);
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}
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VariableReference::VariableReference() {
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_vars = 0;
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_offset = 0;
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}
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VariableReference::VariableReference(Variables &vars, uint32 offset, Variables::Type type) {
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set(vars, offset, type);
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}
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VariableReference::~VariableReference() {
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}
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void VariableReference::set(Variables &vars, uint32 offset, Variables::Type type) {
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_vars = &vars;
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_offset = offset;
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_type = type;
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}
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VariableReference &VariableReference::operator=(uint32 value) {
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if (_vars) {
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switch (_type) {
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case Variables::kVariableType8:
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_vars->writeOff8(_offset, (uint8) value);
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break;
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case Variables::kVariableType16:
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_vars->writeOff16(_offset, (uint16) value);
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break;
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case Variables::kVariableType32:
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_vars->writeOff32(_offset, value);
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break;
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}
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}
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return *this;
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}
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VariableReference::operator uint32() {
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if (_vars) {
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switch (_type) {
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case Variables::kVariableType8:
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return (uint32) _vars->readOff8(_offset);
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case Variables::kVariableType16:
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return (uint32) _vars->readOff16(_offset);
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case Variables::kVariableType32:
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return _vars->readOff32(_offset);
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}
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}
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return 0;
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}
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VariableReference &VariableReference::operator+=(uint32 value) {
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return (*this = (*this + value));
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}
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VariableReference &VariableReference::operator*=(uint32 value) {
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return (*this = (*this * value));
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}
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} // End of namespace Gob
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