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scummvm/engines/gob/parse_v1.cpp

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/* ScummVM - Scumm Interpreter
* Copyright (C) 2004 Ivan Dubrov
* Copyright (C) 2004-2006 The ScummVM project
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "common/stdafx.h"
#include "common/endian.h"
#include "gob/gob.h"
#include "gob/parse.h"
#include "gob/inter.h"
#include "gob/global.h"
namespace Gob {
Parse_v1::Parse_v1(GobEngine *vm) : Parse(vm) {
}
int16 Parse_v1::parseVarIndex() {
int16 temp2;
char *arrDesc;
int16 dim;
int16 dimCount;
int16 operation;
int16 temp;
int16 offset;
int16 val;
operation = *_vm->_global->_inter_execPtr++;
debugC(5, DEBUG_PARSER, "var parse = %d", operation);
switch (operation) {
case 23:
case 25:
temp = _vm->_inter->load16() * 4;
debugC(5, DEBUG_PARSER, "oper = %d", (int16)*_vm->_global->_inter_execPtr);
if (operation == 25 && *_vm->_global->_inter_execPtr == 13) {
_vm->_global->_inter_execPtr++;
val = parseValExpr(12);
temp += val;
debugC(5, DEBUG_PARSER, "parse subscript = %d", val);
}
return temp;
case 26:
case 28:
temp = _vm->_inter->load16() * 4;
dimCount = *_vm->_global->_inter_execPtr++;
arrDesc = _vm->_global->_inter_execPtr;
_vm->_global->_inter_execPtr += dimCount;
offset = 0;
for (dim = 0; dim < dimCount; dim++) {
temp2 = parseValExpr(12);
offset = arrDesc[dim] * offset + temp2;
}
offset *= 4;
if (operation != 28)
return temp + offset;
if (*_vm->_global->_inter_execPtr == 13) {
_vm->_global->_inter_execPtr++;
temp += parseValExpr(12);
}
return offset * _vm->_global->_inter_animDataSize + temp;
default:
return 0;
}
}
int16 Parse_v1::parseValExpr(unsigned stopToken) {
int16 values[20];
byte operStack[20];
int16 *valPtr;
byte *operPtr;
byte *arrDesc;
unsigned operation;
int16 temp2;
int16 dim;
int16 dimCount;
int16 temp;
int16 offset;
int16 stkPos;
int16 brackPos;
static int16 flag = 0;
int16 oldflag;
oldflag = flag;
if (flag == 0) {
flag = 1;
printExpr(stopToken);
}
stkPos = -1;
operPtr = operStack - 1;
valPtr = values - 1;
while (1) {
stkPos++;
operPtr++;
valPtr++;
operation = *_vm->_global->_inter_execPtr++;
if (operation >= 19 && operation <= 29) {
*operPtr = 20;
switch (operation) {
case 19:
*valPtr = READ_LE_UINT32(_vm->_global->_inter_execPtr);
_vm->_global->_inter_execPtr += 4;
break;
case 20:
*valPtr = _vm->_inter->load16();
break;
case 23:
*valPtr = (uint16)VAR(_vm->_inter->load16());
break;
case 25:
temp = _vm->_inter->load16() * 4;
_vm->_global->_inter_execPtr++;
temp += parseValExpr(12);
*valPtr = (uint8)*(_vm->_global->_inter_variables + temp);
break;
case 26:
case 28:
temp = _vm->_inter->load16();
dimCount = *_vm->_global->_inter_execPtr++;
arrDesc = (byte*)_vm->_global->_inter_execPtr;
_vm->_global->_inter_execPtr += dimCount;
offset = 0;
for (dim = 0; dim < dimCount; dim++) {
temp2 = parseValExpr(12);
offset = arrDesc[dim] * offset + temp2;
}
if (operation == 26) {
*valPtr = (uint16)VAR(temp + offset);
} else {
_vm->_global->_inter_execPtr++;
temp2 = parseValExpr(12);
*valPtr = (uint8)*(_vm->_global->_inter_variables + temp * 4 + offset * 4 * _vm->_global->_inter_animDataSize + temp2);
}
break;
case 29:
operation = *_vm->_global->_inter_execPtr++;
parseExpr(10, 0);
if (operation == 5) {
_vm->_global->_inter_resVal = _vm->_global->_inter_resVal * _vm->_global->_inter_resVal;
} else if (operation == 7) {
if (_vm->_global->_inter_resVal < 0)
_vm->_global->_inter_resVal = -_vm->_global->_inter_resVal;
} else if (operation == 10) {
_vm->_global->_inter_resVal = _vm->_util->getRandom(_vm->_global->_inter_resVal);
}
*valPtr = _vm->_global->_inter_resVal;
break;
} // switch
if (stkPos > 0 && operPtr[-1] == 1) {
stkPos--;
operPtr--;
valPtr--;
operPtr[0] = 20;
valPtr[0] = -valPtr[1];
}
if (stkPos > 0 && operPtr[-1] > 4 && operPtr[-1] < 9) {
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
switch (operPtr[1]) {
case 5:
valPtr[0] *= valPtr[2];
break;
case 6:
valPtr[0] /= valPtr[2];
break;
case 7:
valPtr[0] %= valPtr[2];
break;
case 8:
valPtr[0] &= valPtr[2];
break;
}
} // if (stkPos > 0 && cmdPtr[-1] > 4 && cmdPtr[-1] < 9)
continue;
}
if (operation >= 1 && operation <= 9) {
*operPtr = operation;
continue;
}
while (stkPos >= 2) {
if (operPtr[-2] == 9) {
stkPos--;
operPtr--;
valPtr--;
operPtr[-1] = operPtr[0];
valPtr[-1] = valPtr[0];
if (stkPos > 1 && operPtr[-2] == 1) {
valPtr[-2] = 20;
valPtr[-2] = -valPtr[-1];
stkPos--;
operPtr--;
valPtr--;
}
if (stkPos > 2 && operPtr[-2] > 4
&& operPtr[-2] < 9) {
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
switch (operPtr[0]) {
case 5:
operPtr[-1] *= operPtr[1];
break;
case 6:
operPtr[-1] /= operPtr[1];
break;
case 7:
operPtr[-1] %= operPtr[1];
break;
case 8:
operPtr[-1] &= operPtr[1];
break;
}
}
if (operation == 10)
break;
} // operPtr[-2] == 9
for (brackPos = stkPos - 2; brackPos > 0 &&
operStack[brackPos] < 30
&& operStack[brackPos] != 9; brackPos--);
if (operStack[brackPos] >= 30
|| operStack[brackPos] == 9)
brackPos++;
if (operPtr[-2] < 2 || operPtr[-2] > 8)
break;
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
switch (operPtr[0]) {
case 2:
values[brackPos] += valPtr[1];
continue;
case 3:
values[brackPos] -= valPtr[1];
continue;
case 4:
values[brackPos] |= valPtr[1];
continue;
case 5:
valPtr[-1] *= valPtr[1];
continue;
case 6:
valPtr[-1] /= valPtr[1];
continue;
case 7:
valPtr[-1] %= valPtr[1];
continue;
case 8:
valPtr[-1] &= valPtr[1];
continue;
}
}
if (operation != 10) {
if (operation != stopToken) {
debugC(5, DEBUG_PARSER, "stoptoken error: %d != %d", operation, stopToken);
}
flag = oldflag;
return values[0];
}
stkPos--;
operPtr--;
valPtr--;
}
}
int16 Parse_v1::parseExpr(char stopToken, byte *arg_2) {
int32 values[20];
byte operStack[20];
int32 prevPrevVal;
int32 prevVal;
int32 curVal;
int32 *valPtr;
char *operPtr;
byte *arrDescPtr;
char var_C;
byte operation;
int16 dimCount;
int16 temp;
int16 temp2;
uint16 offset;
int16 dim;
char var_1A;
int16 stkPos;
int16 brackStart;
stkPos = -1;
operPtr = (char *)(operStack - 1);
valPtr = values - 1;
while (1) {
stkPos++;
operPtr++;
valPtr++;
operation = *_vm->_global->_inter_execPtr++;
if (operation >= 19 && operation <= 29) {
switch (operation) {
case 19:
*operPtr = 20;
*valPtr = READ_LE_UINT32(_vm->_global->_inter_execPtr);
_vm->_global->_inter_execPtr += 4;
break;
case 20:
*operPtr = 20;
*valPtr = _vm->_inter->load16();
break;
case 22:
*operPtr = 22;
*valPtr = encodePtr(_vm->_global->_inter_execPtr, kExecPtr);
_vm->_global->_inter_execPtr += strlen(_vm->_global->_inter_execPtr) + 1;
break;
case 23:
*operPtr = 20;
*valPtr = VAR(_vm->_inter->load16());
break;
case 25:
*operPtr = 22;
temp = _vm->_inter->load16() * 4;
*valPtr = encodePtr(_vm->_global->_inter_variables + temp, kInterVar);
if (*_vm->_global->_inter_execPtr == 13) {
_vm->_global->_inter_execPtr++;
temp += parseValExpr(12);
*operPtr = 20;
*valPtr = (uint8)*(_vm->_global->_inter_variables + temp);
}
break;
case 26:
case 28:
*operPtr = operation - 6;
temp = _vm->_inter->load16();
dimCount = *_vm->_global->_inter_execPtr++;
arrDescPtr = (byte *)_vm->_global->_inter_execPtr;
_vm->_global->_inter_execPtr += dimCount;
offset = 0;
dim = 0;
for (dim = 0; dim < dimCount; dim++) {
temp2 = parseValExpr(12);
offset = offset * arrDescPtr[dim] + temp2;
}
if (operation == 26) {
*valPtr = VAR(temp + offset);
break;
}
*valPtr = encodePtr(_vm->_global->_inter_variables + temp * 4 + offset * _vm->_global->_inter_animDataSize * 4, kInterVar);
if (*_vm->_global->_inter_execPtr == 13) {
_vm->_global->_inter_execPtr++;
temp2 = parseValExpr(12);
*operPtr = 20;
*valPtr = (uint8)*(_vm->_global->_inter_variables + temp * 4 + offset * 4 * _vm->_global->_inter_animDataSize + temp2);
}
break;
case 29:
operation = *_vm->_global->_inter_execPtr++;
parseExpr(10, 0);
switch (operation) {
case 5:
_vm->_global->_inter_resVal = _vm->_global->_inter_resVal * _vm->_global->_inter_resVal;
break;
case 0:
case 1:
case 6:
curVal = 1;
prevVal = 1;
do {
prevPrevVal = prevVal;
prevVal = curVal;
curVal = (curVal + _vm->_global->_inter_resVal / curVal) / 2;
} while (curVal != prevVal && curVal != prevPrevVal);
_vm->_global->_inter_resVal = curVal;
break;
case 10:
_vm->_global->_inter_resVal = _vm->_util->getRandom(_vm->_global->_inter_resVal);
break;
case 7:
if (_vm->_global->_inter_resVal < 0)
_vm->_global->_inter_resVal = -_vm->_global->_inter_resVal;
break;
}
*operPtr = 20;
*valPtr = _vm->_global->_inter_resVal;
}
if (stkPos > 0 && (operPtr[-1] == 1 || operPtr[-1] == 11)) {
stkPos--;
operPtr--;
valPtr--;
if (*operPtr == 1) {
*operPtr = 20;
valPtr[0] = -valPtr[1];
} else if (*operPtr == 11) {
if (operPtr[1] == 23)
*operPtr = 24;
else
*operPtr = 23;
}
}
if (stkPos <= 0)
continue;
switch (operPtr[-1]) {
case 2:
if (operPtr[-2] == 22) {
if (decodePtr(valPtr[-2]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, decodePtr(valPtr[-2]));
valPtr[-2] = encodePtr(_vm->_global->_inter_resStr, kResStr);
}
strcat(_vm->_global->_inter_resStr, decodePtr(valPtr[0]));
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
}
break;
case 5:
valPtr[-2] *= valPtr[0];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 6:
valPtr[-2] /= valPtr[0];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 7:
valPtr[-2] %= valPtr[0];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 8:
valPtr[-2] &= valPtr[0];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
}
continue;
} // op>= 19 && op <= 29
if (operation == stopToken || operation == 30 || operation == 31 || operation == 10) {
while (stkPos >= 2) {
var_1A = 0;
if (operPtr[-2] == 9 && (operation == 10 || operation == stopToken)) {
operPtr[-2] = operPtr[-1];
if (operPtr[-2] == 20 || operPtr[-2] == 22)
valPtr[-2] = valPtr[-1];
stkPos--;
operPtr--;
valPtr--;
if (stkPos > 1) {
if (operPtr[-2] == 1) {
operPtr[-2] = 20;
valPtr[-2] = -valPtr[-1];
stkPos--;
operPtr--;
valPtr--;
} else if (operPtr[-2] == 11) {
if (operPtr[-1] == 23)
operPtr[-2] = 24;
else
operPtr[-2] = 23;
stkPos--;
operPtr--;
valPtr--;
}
} // stkPos > 1
if (stkPos > 2) {
switch (operPtr[-2]) {
case 5:
valPtr[-3] *= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 6:
valPtr[-3] /= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 7:
valPtr[-3] %= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 8:
valPtr[-3] &= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
} // switch
} // stkPos > 2
if (operation != stopToken)
break;
} // if (operPtr[-2] == 9 && ...)
for (brackStart = stkPos - 2; brackStart > 0 &&
operStack[brackStart] < 30 &&
operStack[brackStart] != 9; brackStart--);
if (operStack[brackStart] >= 30 || operStack[brackStart] == 9)
brackStart++;
switch (operPtr[-2]) {
case 2:
if (operStack[brackStart] == 20) {
values[brackStart] += valPtr[-1];
} else if (operStack[brackStart] == 22) {
if (decodePtr(values[brackStart]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, decodePtr(values[brackStart]));
values[brackStart] = encodePtr(_vm->_global->_inter_resStr, kResStr);
}
strcat(_vm->_global->_inter_resStr, decodePtr(valPtr[-1]));
}
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
continue;
case 3:
values[brackStart] -= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
continue;
case 4:
values[brackStart] |= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
continue;
case 5:
valPtr[-3] *= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 6:
valPtr[-3] /= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 7:
valPtr[-3] %= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 8:
valPtr[-3] &= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 30:
if (operPtr[-3] == 23)
operPtr[-3] = operPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 31:
if (operPtr[-3] == 24)
operPtr[-3] = operPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 32:
var_C = operPtr[-3];
operPtr[-3] = 23;
if (var_C == 20) {
if (valPtr[-3] < valPtr[-1])
operPtr[-3] = 24;
} else if (var_C == 22) {
if (decodePtr(valPtr[-3]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, decodePtr(valPtr[-3]));
valPtr[-3] = encodePtr(_vm->_global->_inter_resStr, kResStr);
}
if (strcmp(_vm->_global->_inter_resStr, decodePtr(valPtr[-1])) < 0)
operPtr[-3] = 24;
}
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 33:
var_C = operPtr[-3];
operPtr[-3] = 23;
if (var_C == 20) {
if (valPtr[-3] <= valPtr[-1])
operPtr[-3] = 24;
} else if (var_C == 22) {
if (decodePtr(valPtr[-3]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, decodePtr(valPtr[-3]));
valPtr[-3] = encodePtr(_vm->_global->_inter_resStr, kResStr);
}
if (strcmp(_vm->_global->_inter_resStr, decodePtr(valPtr[-1])) <= 0)
operPtr[-3] = 24;
}
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 34:
var_C = operPtr[-3];
operPtr[-3] = 23;
if (var_C == 20) {
if (valPtr[-3] > valPtr[-1])
operPtr[-3] = 24;
} else if (var_C == 22) {
if (decodePtr(valPtr[-3]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, decodePtr(valPtr[-3]));
valPtr[-3] = encodePtr(_vm->_global->_inter_resStr, kResStr);
}
if (strcmp(_vm->_global->_inter_resStr, decodePtr(valPtr[-1])) > 0)
operPtr[-3] = 24;
}
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 35:
var_C = operPtr[-3];
operPtr[-3] = 23;
if (var_C == 20) {
if (valPtr[-3] >= valPtr[-1])
operPtr[-3] = 24;
} else if (var_C == 22) {
if (decodePtr(valPtr[-3]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, decodePtr(valPtr[-3]));
valPtr[-3] = encodePtr(_vm->_global->_inter_resStr, kResStr);
}
if (strcmp(_vm->_global->_inter_resStr, decodePtr(valPtr[-1])) >= 0)
operPtr[-3] = 24;
}
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 36:
var_C = operPtr[-3];
operPtr[-3] = 23;
if (var_C == 20) {
if (valPtr[-3] == valPtr[-1])
operPtr[-3] = 24;
} else if (var_C == 22) {
if (decodePtr(valPtr[-3]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, decodePtr(valPtr[-3]));
valPtr[-3] = encodePtr(_vm->_global->_inter_resStr, kResStr);
}
if (strcmp(_vm->_global->_inter_resStr, decodePtr(valPtr[-1])) == 0)
operPtr[-3] = 24;
}
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case 37:
var_C = operPtr[-3];
operPtr[-3] = 23;
if (var_C == 20) {
if (valPtr[-3] != valPtr[-1])
operPtr[-3] = 24;
} else if (var_C == 22) {
if (decodePtr(valPtr[-3]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, decodePtr(valPtr[-3]));
valPtr[-3] = encodePtr(_vm->_global->_inter_resStr, kResStr);
}
if (strcmp(_vm->_global->_inter_resStr, decodePtr(valPtr[-1])) != 0)
operPtr[-3] = 24;
}
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
default:
var_1A = 1;
break;
} // switch
if (var_1A != 0)
break;
} // while (stkPos >= 2)
if (operation == 30 || operation == 31) {
if (operPtr[-1] == 20) {
if (valPtr[-1] != 0)
operPtr[-1] = 24;
else
operPtr[-1] = 23;
}
if ((operation == 30 && operPtr[-1] == 24) ||
(operation == 31 && operPtr[-1] == 23)) {
if (stkPos > 1 && operPtr[-2] == 9) {
skipExpr(10);
operPtr[-2] = operPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
} else {
skipExpr(stopToken);
}
operation = _vm->_global->_inter_execPtr[-1];
if (stkPos > 0 && operPtr[-1] == 11) {
if (operPtr[0] == 23)
operPtr[-1] = 24;
else
operPtr[-1] = 23;
stkPos--;
operPtr--;
valPtr--;
}
} else
operPtr[0] = operation;
} else {
stkPos--;
operPtr--;
valPtr--;
}
if (operation != stopToken)
continue;
if (arg_2 != 0)
*arg_2 = operStack[0];
switch (operStack[0]) {
case 20:
_vm->_global->_inter_resVal = values[0];
break;
case 22:
if (decodePtr(values[0]) != _vm->_global->_inter_resStr)
strcpy(_vm->_global->_inter_resStr, decodePtr(values[0]));
break;
case 11:
if (arg_2 != 0)
*arg_2 ^= 1;
break;
case 23:
case 24:
break;
default:
_vm->_global->_inter_resVal = 0;
if (arg_2 != 0)
*arg_2 = 20;
break;
}
return 0;
} // operation == stopToken || operation == 30 || operation == 31 || operation == 10
if (operation < 1 || operation > 11) {
if (operation < 32 || operation > 37)
continue;
if (stkPos > 2) {
if (operPtr[-2] == 2) {
if (operPtr[-3] == 20) {
valPtr[-3] += valPtr[-1];
} else if (operPtr[-3] == 22) {
if (decodePtr(valPtr[-3]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, decodePtr(valPtr[-3]));
valPtr[-3] = encodePtr(_vm->_global->_inter_resStr, kResStr);
}
strcat(_vm->_global->_inter_resStr, decodePtr(valPtr[-1]));
}
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
} else if (operPtr[-2] == 3) {
valPtr[-3] -= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
} else if (operPtr[-2] == 4) {
valPtr[-3] |= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
}
}
}
*operPtr = operation;
}
}
} // End of namespace Gob
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