mirror of
https://github.com/libretro/scummvm.git
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134 lines
3.6 KiB
C++
134 lines
3.6 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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/*
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* This code is based on Broken Sword 2.5 engine
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*
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* Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
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*
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* Licensed under GNU GPL v2
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*
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*/
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#ifndef SWORD25_PERSISTENCEBLOCK_H
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#define SWORD25_PERSISTENCEBLOCK_H
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// -----------------------------------------------------------------------------
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// Includes
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// -----------------------------------------------------------------------------
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#include "sword25/kernel/common.h"
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namespace Sword25 {
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// -----------------------------------------------------------------------------
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// Class definition
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// -----------------------------------------------------------------------------
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class PersistenceBlock {
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public:
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static uint GetSInt32Size() {
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return sizeof(signed int) + sizeof(byte);
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}
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static uint GetUInt32Size() {
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return sizeof(uint) + sizeof(byte);
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}
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static uint GetFloat32Size() {
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return sizeof(float) + sizeof(byte);
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}
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static uint GetBoolSize() {
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return sizeof(byte) + sizeof(byte);
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}
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static uint GetStringSize(const Common::String &String) {
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return static_cast<uint>(sizeof(uint) + String.size() + sizeof(byte));
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}
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protected:
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enum {
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SINT_MARKER,
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UINT_MARKER,
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FLOAT_MARKER,
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STRING_MARKER,
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BOOL_MARKER,
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BLOCK_MARKER
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};
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// -----------------------------------------------------------------------------
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// Endianess Conversions
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// -----------------------------------------------------------------------------
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//
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// Everything is stored in Little Endian
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// Big Endian Systems will need to be byte swapped during both saving and reading of saved values
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//
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template<typename T>
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static T ConvertEndianessFromSystemToStorage(T Value) {
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if (IsBigEndian()) ReverseByteOrder(&Value);
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return Value;
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}
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template<typename T>
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static T ConvertEndianessFromStorageToSystem(T Value) {
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if (IsBigEndian()) ReverseByteOrder(&Value);
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return Value;
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}
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private:
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static bool IsBigEndian() {
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uint Dummy = 1;
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byte *DummyPtr = reinterpret_cast<byte *>(&Dummy);
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return DummyPtr[0] == 0;
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}
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template<typename T>
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static void Swap(T &One, T &Two) {
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T Temp = One;
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One = Two;
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Two = Temp;
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}
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static void ReverseByteOrder(void *Ptr) {
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// Reverses the byte order of the 32-bit word pointed to by Ptr
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byte *CharPtr = static_cast<byte *>(Ptr);
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Swap(CharPtr[0], CharPtr[3]);
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Swap(CharPtr[1], CharPtr[2]);
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}
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};
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// -----------------------------------------------------------------------------
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// Compile time asserts
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// -----------------------------------------------------------------------------
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#define CTASSERT(ex) typedef char ctassert_type[(ex) ? 1 : -1]
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CTASSERT(sizeof(byte) == 1);
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CTASSERT(sizeof(signed int) == 4);
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CTASSERT(sizeof(uint) == 4);
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CTASSERT(sizeof(float) == 4);
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#undef CTASSERT
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} // End of namespace Sword25
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#endif
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