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/* ScummVM - Scumm Interpreter
* Copyright (C) 2004 The ScummVM project
*
* The ReInherit Engine is (C)2000-2003 by Daniel Balsom.
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
// Type SDataWord_T must be unpadded
#include "saga/saga.h"
#include "saga/gfx.h"
#include "saga/script.h"
#include "saga/sdata.h"
namespace Saga {
SData::SData() {
void *alloc_ptr;
int i;
debug(0, "Initializing script data buffers");
for (i = 0; i < R_SCRIPT_DATABUF_NUM; i++) {
alloc_ptr = malloc(sizeof *_vm->_script->dataBuffer(0));
if (alloc_ptr == NULL) {
error("Couldn't allocate memory for script data buffer %d", i);
}
_vm->_script->setBuffer(i, (R_SCRIPT_DATABUF *)alloc_ptr);
}
alloc_ptr = calloc(R_SCRIPT_DATABUF_LEN, sizeof(SDataWord_T));
if (alloc_ptr == NULL) {
error("Couldn't allocate memory for shared script buffer");
}
// Buffer 0 is the shared data buffer. All scripts can access this.
_vm->_script->dataBuffer(0)->len = R_SCRIPT_DATABUF_LEN;
_vm->_script->dataBuffer(0)->data = (SDataWord_T *)alloc_ptr;
// FIXME: Buffer 1 is the script's static area. The original
// interpreter uses part of buffer 0 for this, but I don't yet
// understand quite how.
_vm->_script->setBuffer(1, (R_SCRIPT_DATABUF *)alloc_ptr);
_vm->_script->dataBuffer(1)->len = R_SCRIPT_DATABUF_LEN;
_vm->_script->dataBuffer(1)->data = (SDataWord_T *)alloc_ptr;
// Remaining buffers are per-script.
for (i = 2; i < R_SCRIPT_DATABUF_NUM; i++) {
_vm->_script->dataBuffer(i)->len = 0;
_vm->_script->dataBuffer(i)->data = NULL;
}
}
SData::~SData() {
// TODO: Free the script data buffers
}
int SData::getWord(int n_buf, int n_word, SDataWord_T *data) {
if ((n_buf < 0) || (n_buf >= R_SCRIPT_DATABUF_NUM)) {
return R_FAILURE;
}
if ((n_word < 0) || (n_word >= _vm->_script->dataBuffer(n_buf)->len)) {
return R_FAILURE;
}
if (data == NULL) {
return R_FAILURE;
}
*data = _vm->_script->dataBuffer(n_buf)->data[n_word];
return R_SUCCESS;
}
int SData::putWord(int n_buf, int n_word, SDataWord_T data) {
if ((n_buf < 0) || (n_buf >= R_SCRIPT_DATABUF_NUM)) {
return R_FAILURE;
}
if ((n_word < 0) || (n_word >= _vm->_script->dataBuffer(n_buf)->len)) {
return R_FAILURE;
}
_vm->_script->dataBuffer(n_buf)->data[n_word] = data;
return R_SUCCESS;
}
int SData::setBit(int n_buf, SDataWord_T n_bit, int bitstate) {
int n_word;
int n_bitpos;
SDataWord_T bit_pattern = 0x01;
if ((n_buf < 0) || (n_buf >= R_SCRIPT_DATABUF_NUM)) {
return R_FAILURE;
}
if (n_bit >= (unsigned long)_vm->_script->dataBuffer(n_buf)->len * (sizeof(SDataWord_T) * CHAR_BIT)) {
return R_FAILURE;
}
n_word = n_bit / (sizeof(SDataWord_T) * CHAR_BIT);
n_bitpos = n_bit % (sizeof(SDataWord_T) * CHAR_BIT);
bit_pattern <<= ((sizeof(SDataWord_T) * CHAR_BIT) - (n_bitpos + 1));
if (bitstate) {
_vm->_script->dataBuffer(n_buf)->data[n_word] |= bit_pattern;
} else {
_vm->_script->dataBuffer(n_buf)->data[n_word] &= ~bit_pattern;
}
return R_SUCCESS;
}
int SData::getBit(int n_buf, SDataWord_T n_bit, int *bitstate) {
int n_word;
int n_bitpos;
SDataWord_T bit_pattern = 0x01;
if ((n_buf < 0) || (n_buf >= R_SCRIPT_DATABUF_NUM)) {
return R_FAILURE;
}
if (n_bit >= (SDataWord_T) _vm->_script->dataBuffer(n_buf)->len * (sizeof(SDataWord_T) * CHAR_BIT)) {
return R_FAILURE;
}
n_word = n_bit / (sizeof(SDataWord_T) * CHAR_BIT);
n_bitpos = n_bit % (sizeof(SDataWord_T) * CHAR_BIT);
bit_pattern <<= ((sizeof(SDataWord_T) * CHAR_BIT) - (n_bitpos + 1));
*bitstate = (_vm->_script->dataBuffer(n_buf)->data[n_word] & bit_pattern) ? 1 : 0;
return R_SUCCESS;
}
int SData::readWordS(SDataWord_T word) {
uint16 u_int = word;
int s_int;
if (u_int & 0x8000U) {
s_int = (int)(u_int - 0x8000U) - 0x7FFF - 1;
} else {
s_int = u_int;
}
return s_int;
}
uint16 SData::readWordU(SDataWord_T word) {
uint16 u_int = (uint16) word;
return u_int;
}
} // End of namespace Saga
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