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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef ULTIMA8_USECODE_UCSTACK_H
#define ULTIMA8_USECODE_UCSTACK_H
#include "common/scummsys.h"
namespace Ultima {
namespace Ultima8 {
// A little-endian stack for use with usecode
class BaseUCStack {
protected:
uint8 *_buf;
uint8 *_bufPtr;
uint32 _size;
public:
BaseUCStack(uint32 len, uint8 *b) : _buf(b), _size(len) {
// stack grows downward, so start at the end of the buffer
_bufPtr = _buf + _size;
}
virtual ~BaseUCStack() { }
inline uint32 getSize() const {
return _size;
}
inline uint32 stacksize() const {
return _size - (_bufPtr - _buf);
}
inline void addSP(const int32 offset) {
_bufPtr += offset;
}
inline unsigned int getSP() const {
return static_cast<unsigned int>(_bufPtr - _buf);
}
inline void setSP(unsigned int pos) {
_bufPtr = _buf + pos;
}
//
// Push values to the stack
//
inline void push1(uint8 val) {
_bufPtr--;
_bufPtr[0] = val;
}
inline void push2(uint16 val) {
_bufPtr -= 2;
_bufPtr[0] = static_cast<uint8>(val & 0xFF);
_bufPtr[1] = static_cast<uint8>((val >> 8) & 0xFF);
}
inline void push4(uint32 val) {
_bufPtr -= 4;
_bufPtr[0] = static_cast<uint8>(val & 0xFF);
_bufPtr[1] = static_cast<uint8>((val >> 8) & 0xFF);
_bufPtr[2] = static_cast<uint8>((val >> 16) & 0xFF);
_bufPtr[3] = static_cast<uint8>((val >> 24) & 0xFF);
}
// Push an arbitrary number of bytes of 0
inline void push0(const uint32 count) {
_bufPtr -= count;
memset(_bufPtr, 0, count);
}
// Push an arbitrary number of bytes
inline void push(const uint8 *in, const uint32 count) {
_bufPtr -= count;
memcpy(_bufPtr, in, count);
}
//
// Pop values from the stack
//
inline uint16 pop2() {
uint8 b0, b1;
b0 = *_bufPtr++;
b1 = *_bufPtr++;
return (b0 | (b1 << 8));
}
inline uint32 pop4() {
uint8 b0, b1, b2, b3;
b0 = *_bufPtr++;
b1 = *_bufPtr++;
b2 = *_bufPtr++;
b3 = *_bufPtr++;
return (b0 | (b1 << 8) | (b2 << 16) | (b3 << 24));
}
inline void pop(uint8 *out, const uint32 count) {
memcpy(out, _bufPtr, count);
_bufPtr += count;
}
//
// Access a value from a location in the stack
//
inline uint8 access1(const uint32 offset) const {
return _buf[offset];
}
inline uint16 access2(const uint32 offset) const {
return (_buf[offset] | (_buf[offset + 1] << 8));
}
inline uint32 access4(const uint32 offset) const {
return _buf[offset] | (_buf[offset + 1] << 8) |
(_buf[offset + 2] << 16) | (_buf[offset + 3] << 24);
}
inline uint8 *access(const uint32 offset) {
return _buf + offset;
}
inline uint8 *access() {
return _bufPtr;
}
//
// Assign a value to a location in the stack
//
inline void assign1(const uint32 offset, const uint8 val) {
const_cast<uint8 *>(_buf)[offset] = static_cast<uint8>(val & 0xFF);
}
inline void assign2(const uint32 offset, const uint16 val) {
const_cast<uint8 *>(_buf)[offset] = static_cast<uint8>(val & 0xFF);
const_cast<uint8 *>(_buf)[offset + 1] = static_cast<uint8>((val >> 8) & 0xFF);
}
inline void assign4(const uint32 offset, const uint32 val) {
const_cast<uint8 *>(_buf)[offset] = static_cast<uint8>(val & 0xFF);
const_cast<uint8 *>(_buf)[offset + 1] = static_cast<uint8>((val >> 8) & 0xFF);
const_cast<uint8 *>(_buf)[offset + 2] = static_cast<uint8>((val >> 16) & 0xFF);
const_cast<uint8 *>(_buf)[offset + 3] = static_cast<uint8>((val >> 24) & 0xFF);
}
inline void assign(const uint32 offset, const uint8 *in, const uint32 len) {
memcpy(const_cast<uint8 *>(_buf) + offset, in, len);
}
};
class DynamicUCStack : public BaseUCStack {
public:
DynamicUCStack(uint32 len = 0x1000) : BaseUCStack(len, new uint8[len]) { }
~DynamicUCStack() override {
delete [] _buf;
}
#ifdef USE_DYNAMIC_UCSTACK
#define UCStack DynamicUCStack
void save(Common::WriteStream *ws);
bool load(Common::ReadStream *rs, uint32 version);
#endif
};
#ifndef USE_DYNAMIC_UCSTACK
class UCStack : public BaseUCStack {
uint8 _bufArray[0x1000];
public:
UCStack() : BaseUCStack(0x1000, _bufArray) { }
~UCStack() override { }
void save(Common::WriteStream *ws);
bool load(Common::ReadStream *rs, uint32 version);
};
#endif
} // End of namespace Ultima8
} // End of namespace Ultima
#endif
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