mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-30 14:14:43 +00:00
555 lines
12 KiB
C++
555 lines
12 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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#include "common/endian.h"
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#include "common/stream.h"
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#include "common/util.h"
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#include "common/system.h"
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#include "kyra/kyra_v1.h"
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#include "kyra/resource.h"
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#include "kyra/script.h"
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namespace Kyra {
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EMCInterpreter::EMCInterpreter(KyraEngine_v1 *vm) : _vm(vm) {
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#define COMMAND(x) { &EMCInterpreter::x, #x }
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static CommandEntry commandProcs[] = {
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// 0x00
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COMMAND(cmd_jmpTo),
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COMMAND(cmd_setRetValue),
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COMMAND(cmd_pushRetOrPos),
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COMMAND(cmd_push),
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// 0x04
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COMMAND(cmd_push),
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COMMAND(cmd_pushReg),
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COMMAND(cmd_pushBPNeg),
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COMMAND(cmd_pushBPAdd),
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// 0x08
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COMMAND(cmd_popRetOrPos),
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COMMAND(cmd_popReg),
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COMMAND(cmd_popBPNeg),
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COMMAND(cmd_popBPAdd),
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// 0x0C
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COMMAND(cmd_addSP),
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COMMAND(cmd_subSP),
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COMMAND(cmd_execOpcode),
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COMMAND(cmd_ifNotJmp),
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// 0x10
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COMMAND(cmd_negate),
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COMMAND(cmd_eval),
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COMMAND(cmd_setRetAndJmp)
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};
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_commands = commandProcs;
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#undef COMMAND
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}
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bool EMCInterpreter::load(const char *filename, EMCData *scriptData, const Common::Array<const Opcode*> *opcodes) {
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ScriptFileParser file(filename, _vm->resource());
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if (!file) {
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error("Couldn't open script file '%s'", filename);
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return false;
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}
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memset(scriptData, 0, sizeof(EMCData));
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uint32 formBlockSize = file.getFORMBlockSize();
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if (formBlockSize == (uint32)-1) {
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error("No FORM chunk found in file: '%s'", filename);
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return false;
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}
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uint32 chunkSize = file.getIFFBlockSize(TEXT_CHUNK);
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if (chunkSize != (uint32)-1) {
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scriptData->text = new byte[chunkSize];
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if (!file.loadIFFBlock(TEXT_CHUNK, scriptData->text, chunkSize)) {
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unload(scriptData);
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error("Couldn't load TEXT chunk from file: '%s'", filename);
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return false;
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}
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}
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chunkSize = file.getIFFBlockSize(ORDR_CHUNK);
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if (chunkSize == (uint32)-1) {
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unload(scriptData);
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error("No ORDR chunk found in file: '%s'", filename);
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return false;
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}
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chunkSize >>= 1;
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scriptData->ordr = new uint16[chunkSize];
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if (!file.loadIFFBlock(ORDR_CHUNK, scriptData->ordr, chunkSize << 1)) {
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unload(scriptData);
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error("Couldn't load ORDR chunk from file: '%s'", filename);
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return false;
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}
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while (chunkSize--)
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scriptData->ordr[chunkSize] = READ_BE_UINT16(&scriptData->ordr[chunkSize]);
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chunkSize = file.getIFFBlockSize(DATA_CHUNK);
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if (chunkSize == (uint32)-1) {
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unload(scriptData);
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error("No DATA chunk found in file: '%s'", filename);
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return false;
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}
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chunkSize >>= 1;
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scriptData->data = new uint16[chunkSize];
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if (!file.loadIFFBlock(DATA_CHUNK, scriptData->data, chunkSize << 1)) {
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unload(scriptData);
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error("Couldn't load DATA chunk from file: '%s'", filename);
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return false;
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}
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scriptData->dataSize = chunkSize;
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while (chunkSize--)
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scriptData->data[chunkSize] = READ_BE_UINT16(&scriptData->data[chunkSize]);
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scriptData->opcodes = opcodes;
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return true;
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}
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void EMCInterpreter::unload(EMCData *data) {
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if (!data)
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return;
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delete[] data->text;
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delete[] data->ordr;
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delete[] data->data;
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data->text = 0;
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data->ordr = data->data = 0;
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}
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void EMCInterpreter::init(EMCState *scriptStat, const EMCData *data) {
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scriptStat->dataPtr = data;
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scriptStat->ip = 0;
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scriptStat->stack[60] = 0;
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scriptStat->bp = 62;
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scriptStat->sp = 60;
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}
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bool EMCInterpreter::start(EMCState *script, int function) {
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if (!script->dataPtr)
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return false;
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uint16 functionOffset = script->dataPtr->ordr[function];
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if (functionOffset == 0xFFFF)
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return false;
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if (_vm->game() == GI_KYRA1) {
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if (_vm->gameFlags().platform == Common::kPlatformFMTowns || _vm->gameFlags().platform == Common::kPlatformPC98)
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script->ip = &script->dataPtr->data[functionOffset+1];
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else
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script->ip = &script->dataPtr->data[functionOffset];
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} else {
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script->ip = &script->dataPtr->data[functionOffset+1];
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}
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return true;
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}
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bool EMCInterpreter::isValid(EMCState *script) {
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if (!script->ip || !script->dataPtr || _vm->quit())
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return false;
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return true;
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}
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bool EMCInterpreter::run(EMCState *script) {
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_parameter = 0;
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if (!script->ip)
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return false;
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// Should be no Problem at all to cast to uint32 here, since that's the biggest ptrdiff the original
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// would allow, of course that's not realistic to happen to be somewhere near the limit of uint32 anyway.
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const uint32 instOffset = (uint32)((const byte*)script->ip - (const byte*)script->dataPtr->data);
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int16 code = *script->ip++;
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int16 opcode = (code >> 8) & 0x1F;
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if (code & 0x8000) {
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opcode = 0;
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_parameter = code & 0x7FFF;
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} else if (code & 0x4000) {
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_parameter = (int8)(code);
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} else if (code & 0x2000) {
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_parameter = *script->ip++;
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} else {
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_parameter = 0;
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}
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if (opcode > 18) {
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error("Script unknown command: %d", opcode);
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} else {
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debugC(5, kDebugLevelScript, "[0x%.08X] EMCInterpreter::%s([%d/%u])", instOffset, _commands[opcode].desc, _parameter, (uint)_parameter);
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(this->*(_commands[opcode].proc))(script);
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}
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return (script->ip != 0);
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}
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#pragma mark -
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#pragma mark - ScriptFileParser implementation
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#pragma mark -
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void ScriptFileParser::setFile(const char *filename, Resource *res) {
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destroy();
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res->exists(filename, true);
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_stream = res->getFileStream(filename);
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assert(_stream);
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_startOffset = 0;
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_endOffset = _stream->size();
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}
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void ScriptFileParser::destroy() {
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delete _stream;
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_stream = 0;
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_startOffset = _endOffset = 0;
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}
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uint32 ScriptFileParser::getFORMBlockSize() {
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uint32 oldOffset = _stream->pos();
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uint32 data = _stream->readUint32LE();
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if (data != FORM_CHUNK) {
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_stream->seek(oldOffset);
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return (uint32)-1;
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}
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data = _stream->readUint32BE();
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return data;
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}
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uint32 ScriptFileParser::getIFFBlockSize(const uint32 chunkName) {
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uint32 size = (uint32)-1;
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_stream->seek(_startOffset + 0x0C);
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while (_stream->pos() < _endOffset) {
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uint32 chunk = _stream->readUint32LE();
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uint32 size_temp = _stream->readUint32BE();
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if (chunk != chunkName) {
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_stream->seek((size_temp + 1) & (~1), SEEK_CUR);
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assert(_stream->pos() <= _endOffset);
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} else {
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size = size_temp;
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break;
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}
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}
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return size;
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}
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bool ScriptFileParser::loadIFFBlock(const uint32 chunkName, void *loadTo, uint32 ptrSize) {
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_stream->seek(_startOffset + 0x0C);
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while (_stream->pos() < _endOffset) {
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uint32 chunk = _stream->readUint32LE();
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uint32 chunkSize = _stream->readUint32BE();
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if (chunk != chunkName) {
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_stream->seek((chunkSize + 1) & (~1), SEEK_CUR);
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assert(_stream->pos() <= _endOffset);
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} else {
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uint32 loadSize = 0;
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loadSize = MIN(ptrSize, chunkSize);
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_stream->read(loadTo, loadSize);
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return true;
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}
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}
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return false;
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}
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#pragma mark -
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#pragma mark - Command implementations
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#pragma mark -
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void EMCInterpreter::cmd_jmpTo(EMCState* script) {
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script->ip = script->dataPtr->data + _parameter;
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}
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void EMCInterpreter::cmd_setRetValue(EMCState* script) {
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script->retValue = _parameter;
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}
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void EMCInterpreter::cmd_pushRetOrPos(EMCState* script) {
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switch (_parameter) {
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case 0:
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script->stack[--script->sp] = script->retValue;
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break;
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case 1:
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script->stack[--script->sp] = script->ip - script->dataPtr->data + 1;
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script->stack[--script->sp] = script->bp;
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script->bp = script->sp + 2;
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break;
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default:
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script->ip = 0;
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break;
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}
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}
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void EMCInterpreter::cmd_push(EMCState* script) {
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script->stack[--script->sp] = _parameter;
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}
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void EMCInterpreter::cmd_pushReg(EMCState* script) {
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script->stack[--script->sp] = script->regs[_parameter];
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}
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void EMCInterpreter::cmd_pushBPNeg(EMCState* script) {
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script->stack[--script->sp] = script->stack[(-(int32)(_parameter + 2)) + script->bp];
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}
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void EMCInterpreter::cmd_pushBPAdd(EMCState* script) {
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script->stack[--script->sp] = script->stack[(_parameter - 1) + script->bp];
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}
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void EMCInterpreter::cmd_popRetOrPos(EMCState* script) {
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switch (_parameter) {
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case 0:
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script->retValue = script->stack[script->sp++];
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break;
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case 1:
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if (script->sp >= 60) {
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script->ip = 0;
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} else {
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script->bp = script->stack[script->sp++];
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script->ip = script->dataPtr->data + script->stack[script->sp++];
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}
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break;
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default:
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script->ip = 0;
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break;
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}
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}
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void EMCInterpreter::cmd_popReg(EMCState* script) {
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script->regs[_parameter] = script->stack[script->sp++];
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}
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void EMCInterpreter::cmd_popBPNeg(EMCState* script) {
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script->stack[(-(int32)(_parameter + 2)) + script->bp] = script->stack[script->sp++];
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}
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void EMCInterpreter::cmd_popBPAdd(EMCState* script) {
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script->stack[(_parameter - 1) + script->bp] = script->stack[script->sp++];
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}
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void EMCInterpreter::cmd_addSP(EMCState* script) {
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script->sp += _parameter;
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}
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void EMCInterpreter::cmd_subSP(EMCState* script) {
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script->sp -= _parameter;
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}
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void EMCInterpreter::cmd_execOpcode(EMCState* script) {
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uint8 opcode = _parameter;
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assert(script->dataPtr->opcodes);
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assert(opcode < script->dataPtr->opcodes->size());
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if ((*script->dataPtr->opcodes)[opcode] && ((*script->dataPtr->opcodes)[opcode])->isValid()) {
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script->retValue = (*(*script->dataPtr->opcodes)[opcode])(script);
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} else {
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script->retValue = 0;
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warning("calling unimplemented opcode(0x%.02X/%d)", opcode, opcode);
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}
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}
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void EMCInterpreter::cmd_ifNotJmp(EMCState* script) {
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if (!script->stack[script->sp++]) {
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_parameter &= 0x7FFF;
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script->ip = script->dataPtr->data + _parameter;
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}
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}
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void EMCInterpreter::cmd_negate(EMCState* script) {
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int16 value = script->stack[script->sp];
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switch (_parameter) {
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case 0:
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if (!value)
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script->stack[script->sp] = 1;
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else
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script->stack[script->sp] = 0;
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break;
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case 1:
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script->stack[script->sp] = -value;
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break;
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case 2:
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script->stack[script->sp] = ~value;
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break;
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default:
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warning("Unknown negation func: %d", _parameter);
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script->ip = 0;
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break;
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}
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}
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void EMCInterpreter::cmd_eval(EMCState* script) {
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int16 ret = 0;
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bool error = false;
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int16 val1 = script->stack[script->sp++];
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int16 val2 = script->stack[script->sp++];
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switch (_parameter) {
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case 0:
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if (!val2 || !val1)
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ret = 0;
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else
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ret = 1;
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break;
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case 1:
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if (val2 || val1)
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ret = 1;
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else
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ret = 0;
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break;
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case 2:
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if (val1 == val2)
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ret = 1;
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else
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ret = 0;
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break;
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case 3:
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if (val1 != val2)
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ret = 1;
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else
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ret = 0;
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break;
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case 4:
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if (val1 > val2)
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ret = 1;
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else
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ret = 0;
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break;
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case 5:
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if (val1 >= val2)
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ret = 1;
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else
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ret = 0;
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break;
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case 6:
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if (val1 < val2)
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ret = 1;
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else
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ret = 0;
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break;
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case 7:
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if (val1 <= val2)
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ret = 1;
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else
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ret = 0;
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break;
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case 8:
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ret = val1 + val2;
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break;
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case 9:
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ret = val2 - val1;
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break;
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case 10:
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ret = val1 * val2;
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break;
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case 11:
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ret = val2 / val1;
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break;
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case 12:
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ret = val2 >> val1;
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break;
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case 13:
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ret = val2 << val1;
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break;
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case 14:
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ret = val1 & val2;
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break;
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case 15:
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ret = val1 | val2;
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break;
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case 16:
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ret = val2 % val1;
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break;
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case 17:
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ret = val1 ^ val2;
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break;
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default:
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warning("Unknown evaluate func: %d", _parameter);
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error = true;
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break;
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}
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if (error)
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script->ip = 0;
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else
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script->stack[--script->sp] = ret;
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}
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void EMCInterpreter::cmd_setRetAndJmp(EMCState* script) {
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if (script->sp >= 60) {
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script->ip = 0;
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} else {
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script->retValue = script->stack[script->sp++];
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uint16 temp = script->stack[script->sp++];
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script->stack[60] = 0;
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script->ip = &script->dataPtr->data[temp];
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}
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}
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} // end of namespace Kyra
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