mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-23 10:19:27 +00:00
555 lines
12 KiB
C++
555 lines
12 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2004-2006 The ScummVM project
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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/stdafx.h"
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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.h"
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#include "kyra/resource.h"
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#include "kyra/script.h"
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#define FORM_CHUNK 0x4D524F46
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#define TEXT_CHUNK 0x54584554
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#define DATA_CHUNK 0x41544144
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#define ORDR_CHUNK 0x5244524F
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namespace Kyra {
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ScriptHelper::ScriptHelper(KyraEngine *vm) : _vm(vm) {
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#define COMMAND(x) { &ScriptHelper::x, #x }
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// now we create a list of all Command/Opcode procs and so
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static CommandEntry commandProcs[] = {
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// 0x00
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COMMAND(c1_jmpTo),
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COMMAND(c1_setRetValue),
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COMMAND(c1_pushRetOrPos),
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COMMAND(c1_push),
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// 0x04
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COMMAND(c1_push),
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COMMAND(c1_pushVar),
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COMMAND(c1_pushBPNeg),
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COMMAND(c1_pushBPAdd),
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// 0x08
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COMMAND(c1_popRetOrPos),
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COMMAND(c1_popVar),
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COMMAND(c1_popBPNeg),
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COMMAND(c1_popBPAdd),
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// 0x0C
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COMMAND(c1_addSP),
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COMMAND(c1_subSP),
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COMMAND(c1_execOpcode),
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COMMAND(c1_ifNotJmp),
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// 0x10
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COMMAND(c1_negate),
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COMMAND(c1_eval),
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COMMAND(c1_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 ScriptHelper::loadScript(const char *filename, ScriptData *scriptData, const Common::Array<const Opcode*> *opcodes) {
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uint32 size = 0;
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uint8 *data = _vm->resource()->fileData(filename, &size);
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const byte *curData = data;
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uint32 formBlockSize = getFORMBlockSize(curData);
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if (formBlockSize == (uint32)-1) {
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delete [] data;
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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 = getIFFBlockSize(data, curData, size, TEXT_CHUNK);
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if (chunkSize != (uint32)-1) {
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scriptData->text = new byte[chunkSize];
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if (!loadIFFBlock(data, curData, size, TEXT_CHUNK, scriptData->text, chunkSize)) {
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delete [] data;
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unloadScript(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 = getIFFBlockSize(data, curData, size, ORDR_CHUNK);
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if (chunkSize == (uint32)-1) {
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delete [] data;
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unloadScript(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 (!loadIFFBlock(data, curData, size, ORDR_CHUNK, scriptData->ordr, chunkSize << 1)) {
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delete [] data;
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unloadScript(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 = getIFFBlockSize(data, curData, size, DATA_CHUNK);
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if (chunkSize == (uint32)-1) {
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delete [] data;
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unloadScript(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 (!loadIFFBlock(data, curData, size, DATA_CHUNK, scriptData->data, chunkSize << 1)) {
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delete [] data;
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unloadScript(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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delete [] data;
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return true;
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}
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void ScriptHelper::unloadScript(ScriptData *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 ScriptHelper::initScript(ScriptState *scriptStat, const ScriptData *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 ScriptHelper::startScript(ScriptState *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->gameFlags().platform == Common::kPlatformFMTowns)
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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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return true;
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}
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bool ScriptHelper::validScript(ScriptState *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 ScriptHelper::runScript(ScriptState *script) {
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_parameter = 0;
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_continue = true;
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if (!script->ip)
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return false;
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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, "%s([%d/%u])", _commands[opcode].desc, _parameter, (uint)_parameter);
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(this->*(_commands[opcode].proc))(script);
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}
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return _continue;
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}
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uint32 ScriptHelper::getFORMBlockSize(const byte *&data) const {
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static const uint32 chunkName = FORM_CHUNK;
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if (READ_LE_UINT32(data) != chunkName)
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return (uint32)-1;
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data += 4;
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uint32 retValue = READ_BE_UINT32(data); data += 4;
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return retValue;
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}
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uint32 ScriptHelper::getIFFBlockSize(const byte *start, const byte *&data, uint32 maxSize, const uint32 chunkName) const {
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uint32 size = (uint32)-1;
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bool special = false;
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if (data == (start + maxSize))
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data = start + 0x0C;
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while (data < (start + maxSize)) {
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uint32 chunk = READ_LE_UINT32(data); data += 4;
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uint32 size_temp = READ_BE_UINT32(data); data += 4;
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if (chunk != chunkName) {
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if (special) {
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data += (size_temp + 1) & 0xFFFFFFFE;
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} else {
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data = start + 0x0C;
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special = true;
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}
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} else {
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// kill our data
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data = start;
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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 ScriptHelper::loadIFFBlock(const byte *start, const byte *&data, uint32 maxSize, const uint32 chunkName, void *loadTo, uint32 ptrSize) const {
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bool special = false;
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if (data == (start + maxSize))
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data = start + 0x0C;
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while (data < (start + maxSize)) {
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uint32 chunk = READ_LE_UINT32(data); data += 4;
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uint32 chunkSize = READ_BE_UINT32(data); data += 4;
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if (chunk != chunkName) {
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if (special) {
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data += (chunkSize + 1) & 0xFFFFFFFE;
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} else {
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data = start + 0x0C;
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special = true;
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}
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} else {
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uint32 loadSize = 0;
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if (chunkSize < ptrSize)
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loadSize = chunkSize;
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else
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loadSize = ptrSize;
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memcpy(loadTo, data, loadSize);
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chunkSize = (chunkSize + 1) & 0xFFFFFFFE;
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if (chunkSize > loadSize)
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data += (chunkSize - 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 ScriptHelper::c1_jmpTo(ScriptState* script) {
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script->ip = script->dataPtr->data + _parameter;
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}
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void ScriptHelper::c1_setRetValue(ScriptState* script) {
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script->retValue = _parameter;
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}
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void ScriptHelper::c1_pushRetOrPos(ScriptState* 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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_continue = false;
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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 ScriptHelper::c1_push(ScriptState* script) {
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script->stack[--script->sp] = _parameter;
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}
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void ScriptHelper::c1_pushVar(ScriptState* script) {
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script->stack[--script->sp] = script->variables[_parameter];
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}
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void ScriptHelper::c1_pushBPNeg(ScriptState* 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 ScriptHelper::c1_pushBPAdd(ScriptState* script) {
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script->stack[--script->sp] = script->stack[(_parameter - 1) + script->bp];
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}
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void ScriptHelper::c1_popRetOrPos(ScriptState* 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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_continue = false;
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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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_continue = false;
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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 ScriptHelper::c1_popVar(ScriptState* script) {
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script->variables[_parameter] = script->stack[script->sp++];
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}
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void ScriptHelper::c1_popBPNeg(ScriptState* 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 ScriptHelper::c1_popBPAdd(ScriptState* script) {
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script->stack[(_parameter - 1) + script->bp] = script->stack[script->sp++];
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}
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void ScriptHelper::c1_addSP(ScriptState* script) {
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script->sp += _parameter;
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}
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void ScriptHelper::c1_subSP(ScriptState* script) {
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script->sp -= _parameter;
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}
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void ScriptHelper::c1_execOpcode(ScriptState* 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]) {
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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)", opcode);
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}
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}
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void ScriptHelper::c1_ifNotJmp(ScriptState* 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 ScriptHelper::c1_negate(ScriptState* 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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_continue = false;
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break;
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}
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}
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void ScriptHelper::c1_eval(ScriptState* 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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_continue = false;
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} else {
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script->stack[--script->sp] = ret;
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}
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}
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void ScriptHelper::c1_setRetAndJmp(ScriptState* script) {
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if (script->sp >= 60) {
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_continue = false;
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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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