mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-21 09:21:08 +00:00
555 lines
12 KiB
C++
555 lines
12 KiB
C++
/* 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 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/endian.h"
|
|
#include "common/stream.h"
|
|
#include "common/util.h"
|
|
#include "common/system.h"
|
|
#include "kyra/kyra_v1.h"
|
|
#include "kyra/resource.h"
|
|
#include "kyra/script.h"
|
|
|
|
namespace Kyra {
|
|
EMCInterpreter::EMCInterpreter(KyraEngine_v1 *vm) : _vm(vm) {
|
|
#define COMMAND(x) { &EMCInterpreter::x, #x }
|
|
static CommandEntry commandProcs[] = {
|
|
// 0x00
|
|
COMMAND(cmd_jmpTo),
|
|
COMMAND(cmd_setRetValue),
|
|
COMMAND(cmd_pushRetOrPos),
|
|
COMMAND(cmd_push),
|
|
// 0x04
|
|
COMMAND(cmd_push),
|
|
COMMAND(cmd_pushReg),
|
|
COMMAND(cmd_pushBPNeg),
|
|
COMMAND(cmd_pushBPAdd),
|
|
// 0x08
|
|
COMMAND(cmd_popRetOrPos),
|
|
COMMAND(cmd_popReg),
|
|
COMMAND(cmd_popBPNeg),
|
|
COMMAND(cmd_popBPAdd),
|
|
// 0x0C
|
|
COMMAND(cmd_addSP),
|
|
COMMAND(cmd_subSP),
|
|
COMMAND(cmd_execOpcode),
|
|
COMMAND(cmd_ifNotJmp),
|
|
// 0x10
|
|
COMMAND(cmd_negate),
|
|
COMMAND(cmd_eval),
|
|
COMMAND(cmd_setRetAndJmp)
|
|
};
|
|
_commands = commandProcs;
|
|
#undef COMMAND
|
|
}
|
|
|
|
bool EMCInterpreter::load(const char *filename, EMCData *scriptData, const Common::Array<const Opcode*> *opcodes) {
|
|
ScriptFileParser file(filename, _vm->resource());
|
|
if (!file) {
|
|
error("Couldn't open script file '%s'", filename);
|
|
return false;
|
|
}
|
|
|
|
memset(scriptData, 0, sizeof(EMCData));
|
|
|
|
uint32 formBlockSize = file.getFORMBlockSize();
|
|
if (formBlockSize == (uint32)-1) {
|
|
error("No FORM chunk found in file: '%s'", filename);
|
|
return false;
|
|
}
|
|
|
|
uint32 chunkSize = file.getIFFBlockSize(TEXT_CHUNK);
|
|
if (chunkSize != (uint32)-1) {
|
|
scriptData->text = new byte[chunkSize];
|
|
|
|
if (!file.loadIFFBlock(TEXT_CHUNK, scriptData->text, chunkSize)) {
|
|
unload(scriptData);
|
|
error("Couldn't load TEXT chunk from file: '%s'", filename);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
chunkSize = file.getIFFBlockSize(ORDR_CHUNK);
|
|
if (chunkSize == (uint32)-1) {
|
|
unload(scriptData);
|
|
error("No ORDR chunk found in file: '%s'", filename);
|
|
return false;
|
|
}
|
|
chunkSize >>= 1;
|
|
|
|
scriptData->ordr = new uint16[chunkSize];
|
|
|
|
if (!file.loadIFFBlock(ORDR_CHUNK, scriptData->ordr, chunkSize << 1)) {
|
|
unload(scriptData);
|
|
error("Couldn't load ORDR chunk from file: '%s'", filename);
|
|
return false;
|
|
}
|
|
|
|
while (chunkSize--)
|
|
scriptData->ordr[chunkSize] = READ_BE_UINT16(&scriptData->ordr[chunkSize]);
|
|
|
|
chunkSize = file.getIFFBlockSize(DATA_CHUNK);
|
|
if (chunkSize == (uint32)-1) {
|
|
unload(scriptData);
|
|
error("No DATA chunk found in file: '%s'", filename);
|
|
return false;
|
|
}
|
|
chunkSize >>= 1;
|
|
|
|
scriptData->data = new uint16[chunkSize];
|
|
|
|
if (!file.loadIFFBlock(DATA_CHUNK, scriptData->data, chunkSize << 1)) {
|
|
unload(scriptData);
|
|
error("Couldn't load DATA chunk from file: '%s'", filename);
|
|
return false;
|
|
}
|
|
scriptData->dataSize = chunkSize;
|
|
|
|
while (chunkSize--)
|
|
scriptData->data[chunkSize] = READ_BE_UINT16(&scriptData->data[chunkSize]);
|
|
|
|
scriptData->opcodes = opcodes;
|
|
|
|
return true;
|
|
}
|
|
|
|
void EMCInterpreter::unload(EMCData *data) {
|
|
if (!data)
|
|
return;
|
|
|
|
delete[] data->text;
|
|
delete[] data->ordr;
|
|
delete[] data->data;
|
|
|
|
data->text = 0;
|
|
data->ordr = data->data = 0;
|
|
}
|
|
|
|
void EMCInterpreter::init(EMCState *scriptStat, const EMCData *data) {
|
|
scriptStat->dataPtr = data;
|
|
scriptStat->ip = 0;
|
|
scriptStat->stack[60] = 0;
|
|
scriptStat->bp = 62;
|
|
scriptStat->sp = 60;
|
|
}
|
|
|
|
bool EMCInterpreter::start(EMCState *script, int function) {
|
|
if (!script->dataPtr)
|
|
return false;
|
|
|
|
uint16 functionOffset = script->dataPtr->ordr[function];
|
|
if (functionOffset == 0xFFFF)
|
|
return false;
|
|
|
|
if (_vm->game() == GI_KYRA1) {
|
|
if (_vm->gameFlags().platform == Common::kPlatformFMTowns || _vm->gameFlags().platform == Common::kPlatformPC98)
|
|
script->ip = &script->dataPtr->data[functionOffset+1];
|
|
else
|
|
script->ip = &script->dataPtr->data[functionOffset];
|
|
} else {
|
|
script->ip = &script->dataPtr->data[functionOffset+1];
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool EMCInterpreter::isValid(EMCState *script) {
|
|
if (!script->ip || !script->dataPtr || _vm->quit())
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
bool EMCInterpreter::run(EMCState *script) {
|
|
_parameter = 0;
|
|
|
|
if (!script->ip)
|
|
return false;
|
|
|
|
// Should be no Problem at all to cast to uint32 here, since that's the biggest ptrdiff the original
|
|
// would allow, of course that's not realistic to happen to be somewhere near the limit of uint32 anyway.
|
|
const uint32 instOffset = (uint32)((const byte*)script->ip - (const byte*)script->dataPtr->data);
|
|
int16 code = *script->ip++;
|
|
int16 opcode = (code >> 8) & 0x1F;
|
|
|
|
if (code & 0x8000) {
|
|
opcode = 0;
|
|
_parameter = code & 0x7FFF;
|
|
} else if (code & 0x4000) {
|
|
_parameter = (int8)(code);
|
|
} else if (code & 0x2000) {
|
|
_parameter = *script->ip++;
|
|
} else {
|
|
_parameter = 0;
|
|
}
|
|
|
|
if (opcode > 18) {
|
|
error("Script unknown command: %d", opcode);
|
|
} else {
|
|
debugC(5, kDebugLevelScript, "[0x%.08X] EMCInterpreter::%s([%d/%u])", instOffset, _commands[opcode].desc, _parameter, (uint)_parameter);
|
|
(this->*(_commands[opcode].proc))(script);
|
|
}
|
|
|
|
return (script->ip != 0);
|
|
}
|
|
|
|
#pragma mark -
|
|
#pragma mark - ScriptFileParser implementation
|
|
#pragma mark -
|
|
|
|
void ScriptFileParser::setFile(const char *filename, Resource *res) {
|
|
destroy();
|
|
|
|
res->exists(filename, true);
|
|
_stream = res->getFileStream(filename);
|
|
assert(_stream);
|
|
_startOffset = 0;
|
|
_endOffset = _stream->size();
|
|
}
|
|
|
|
void ScriptFileParser::destroy() {
|
|
delete _stream;
|
|
_stream = 0;
|
|
_startOffset = _endOffset = 0;
|
|
}
|
|
|
|
uint32 ScriptFileParser::getFORMBlockSize() {
|
|
uint32 oldOffset = _stream->pos();
|
|
|
|
uint32 data = _stream->readUint32LE();
|
|
|
|
if (data != FORM_CHUNK) {
|
|
_stream->seek(oldOffset);
|
|
return (uint32)-1;
|
|
}
|
|
|
|
data = _stream->readUint32BE();
|
|
return data;
|
|
}
|
|
|
|
uint32 ScriptFileParser::getIFFBlockSize(const uint32 chunkName) {
|
|
uint32 size = (uint32)-1;
|
|
|
|
_stream->seek(_startOffset + 0x0C);
|
|
|
|
while (_stream->pos() < _endOffset) {
|
|
uint32 chunk = _stream->readUint32LE();
|
|
uint32 size_temp = _stream->readUint32BE();
|
|
|
|
if (chunk != chunkName) {
|
|
_stream->seek((size_temp + 1) & (~1), SEEK_CUR);
|
|
assert(_stream->pos() <= _endOffset);
|
|
} else {
|
|
size = size_temp;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
bool ScriptFileParser::loadIFFBlock(const uint32 chunkName, void *loadTo, uint32 ptrSize) {
|
|
_stream->seek(_startOffset + 0x0C);
|
|
|
|
while (_stream->pos() < _endOffset) {
|
|
uint32 chunk = _stream->readUint32LE();
|
|
uint32 chunkSize = _stream->readUint32BE();
|
|
|
|
if (chunk != chunkName) {
|
|
_stream->seek((chunkSize + 1) & (~1), SEEK_CUR);
|
|
assert(_stream->pos() <= _endOffset);
|
|
} else {
|
|
uint32 loadSize = 0;
|
|
|
|
loadSize = MIN(ptrSize, chunkSize);
|
|
_stream->read(loadTo, loadSize);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
#pragma mark -
|
|
#pragma mark - Command implementations
|
|
#pragma mark -
|
|
|
|
void EMCInterpreter::cmd_jmpTo(EMCState* script) {
|
|
script->ip = script->dataPtr->data + _parameter;
|
|
}
|
|
|
|
void EMCInterpreter::cmd_setRetValue(EMCState* script) {
|
|
script->retValue = _parameter;
|
|
}
|
|
|
|
void EMCInterpreter::cmd_pushRetOrPos(EMCState* script) {
|
|
switch (_parameter) {
|
|
case 0:
|
|
script->stack[--script->sp] = script->retValue;
|
|
break;
|
|
|
|
case 1:
|
|
script->stack[--script->sp] = script->ip - script->dataPtr->data + 1;
|
|
script->stack[--script->sp] = script->bp;
|
|
script->bp = script->sp + 2;
|
|
break;
|
|
|
|
default:
|
|
script->ip = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void EMCInterpreter::cmd_push(EMCState* script) {
|
|
script->stack[--script->sp] = _parameter;
|
|
}
|
|
|
|
void EMCInterpreter::cmd_pushReg(EMCState* script) {
|
|
script->stack[--script->sp] = script->regs[_parameter];
|
|
}
|
|
|
|
void EMCInterpreter::cmd_pushBPNeg(EMCState* script) {
|
|
script->stack[--script->sp] = script->stack[(-(int32)(_parameter + 2)) + script->bp];
|
|
}
|
|
|
|
void EMCInterpreter::cmd_pushBPAdd(EMCState* script) {
|
|
script->stack[--script->sp] = script->stack[(_parameter - 1) + script->bp];
|
|
}
|
|
|
|
void EMCInterpreter::cmd_popRetOrPos(EMCState* script) {
|
|
switch (_parameter) {
|
|
case 0:
|
|
script->retValue = script->stack[script->sp++];
|
|
break;
|
|
|
|
case 1:
|
|
if (script->sp >= 60) {
|
|
script->ip = 0;
|
|
} else {
|
|
script->bp = script->stack[script->sp++];
|
|
script->ip = script->dataPtr->data + script->stack[script->sp++];
|
|
}
|
|
break;
|
|
|
|
default:
|
|
script->ip = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void EMCInterpreter::cmd_popReg(EMCState* script) {
|
|
script->regs[_parameter] = script->stack[script->sp++];
|
|
}
|
|
|
|
void EMCInterpreter::cmd_popBPNeg(EMCState* script) {
|
|
script->stack[(-(int32)(_parameter + 2)) + script->bp] = script->stack[script->sp++];
|
|
}
|
|
|
|
void EMCInterpreter::cmd_popBPAdd(EMCState* script) {
|
|
script->stack[(_parameter - 1) + script->bp] = script->stack[script->sp++];
|
|
}
|
|
|
|
void EMCInterpreter::cmd_addSP(EMCState* script) {
|
|
script->sp += _parameter;
|
|
}
|
|
|
|
void EMCInterpreter::cmd_subSP(EMCState* script) {
|
|
script->sp -= _parameter;
|
|
}
|
|
|
|
void EMCInterpreter::cmd_execOpcode(EMCState* script) {
|
|
uint8 opcode = _parameter;
|
|
|
|
assert(script->dataPtr->opcodes);
|
|
assert(opcode < script->dataPtr->opcodes->size());
|
|
|
|
if ((*script->dataPtr->opcodes)[opcode] && ((*script->dataPtr->opcodes)[opcode])->isValid()) {
|
|
script->retValue = (*(*script->dataPtr->opcodes)[opcode])(script);
|
|
} else {
|
|
script->retValue = 0;
|
|
warning("calling unimplemented opcode(0x%.02X/%d)", opcode, opcode);
|
|
}
|
|
}
|
|
|
|
void EMCInterpreter::cmd_ifNotJmp(EMCState* script) {
|
|
if (!script->stack[script->sp++]) {
|
|
_parameter &= 0x7FFF;
|
|
script->ip = script->dataPtr->data + _parameter;
|
|
}
|
|
}
|
|
|
|
void EMCInterpreter::cmd_negate(EMCState* script) {
|
|
int16 value = script->stack[script->sp];
|
|
switch (_parameter) {
|
|
case 0:
|
|
if (!value)
|
|
script->stack[script->sp] = 1;
|
|
else
|
|
script->stack[script->sp] = 0;
|
|
break;
|
|
|
|
case 1:
|
|
script->stack[script->sp] = -value;
|
|
break;
|
|
|
|
case 2:
|
|
script->stack[script->sp] = ~value;
|
|
break;
|
|
|
|
default:
|
|
warning("Unknown negation func: %d", _parameter);
|
|
script->ip = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void EMCInterpreter::cmd_eval(EMCState* script) {
|
|
int16 ret = 0;
|
|
bool error = false;
|
|
|
|
int16 val1 = script->stack[script->sp++];
|
|
int16 val2 = script->stack[script->sp++];
|
|
|
|
switch (_parameter) {
|
|
case 0:
|
|
if (!val2 || !val1)
|
|
ret = 0;
|
|
else
|
|
ret = 1;
|
|
break;
|
|
|
|
case 1:
|
|
if (val2 || val1)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
break;
|
|
|
|
case 2:
|
|
if (val1 == val2)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
break;
|
|
|
|
case 3:
|
|
if (val1 != val2)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
break;
|
|
|
|
case 4:
|
|
if (val1 > val2)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
break;
|
|
|
|
case 5:
|
|
if (val1 >= val2)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
break;
|
|
|
|
case 6:
|
|
if (val1 < val2)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
break;
|
|
|
|
case 7:
|
|
if (val1 <= val2)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
break;
|
|
|
|
case 8:
|
|
ret = val1 + val2;
|
|
break;
|
|
|
|
case 9:
|
|
ret = val2 - val1;
|
|
break;
|
|
|
|
case 10:
|
|
ret = val1 * val2;
|
|
break;
|
|
|
|
case 11:
|
|
ret = val2 / val1;
|
|
break;
|
|
|
|
case 12:
|
|
ret = val2 >> val1;
|
|
break;
|
|
|
|
case 13:
|
|
ret = val2 << val1;
|
|
break;
|
|
|
|
case 14:
|
|
ret = val1 & val2;
|
|
break;
|
|
|
|
case 15:
|
|
ret = val1 | val2;
|
|
break;
|
|
|
|
case 16:
|
|
ret = val2 % val1;
|
|
break;
|
|
|
|
case 17:
|
|
ret = val1 ^ val2;
|
|
break;
|
|
|
|
default:
|
|
warning("Unknown evaluate func: %d", _parameter);
|
|
error = true;
|
|
break;
|
|
}
|
|
|
|
if (error)
|
|
script->ip = 0;
|
|
else
|
|
script->stack[--script->sp] = ret;
|
|
}
|
|
|
|
void EMCInterpreter::cmd_setRetAndJmp(EMCState* script) {
|
|
if (script->sp >= 60) {
|
|
script->ip = 0;
|
|
} else {
|
|
script->retValue = script->stack[script->sp++];
|
|
uint16 temp = script->stack[script->sp++];
|
|
script->stack[60] = 0;
|
|
script->ip = &script->dataPtr->data[temp];
|
|
}
|
|
}
|
|
} // end of namespace Kyra
|
|
|