mirror of
https://github.com/libretro/scummvm.git
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298 lines
7.6 KiB
C++
298 lines
7.6 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2004-2005 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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* $Header$
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*
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*/
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#include "common/stdafx.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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ScriptHelper::~ScriptHelper() {
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}
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bool ScriptHelper::loadScript(const char *filename, ScriptData *scriptData, KyraEngine::OpcodeProc *opcodes, int opcodeSize, byte *specialPtr) {
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uint32 size = 0;
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uint8 *data = _vm->resource()->fileData(filename, &size);
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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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if (specialPtr) {
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scriptData->mustBeFreed = 0;
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scriptData->text = specialPtr;
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specialPtr += chunkSize;
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} else {
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scriptData->mustBeFreed = 1;
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scriptData->text = new byte[chunkSize];
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}
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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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if (specialPtr) {
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scriptData->mustBeFreed = 0;
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scriptData->ordr = specialPtr;
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specialPtr += chunkSize;
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} else {
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scriptData->mustBeFreed = 1;
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scriptData->ordr = new byte[chunkSize];
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}
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if (!loadIFFBlock(data, curData, size, ORDR_CHUNK, scriptData->ordr, chunkSize)) {
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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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chunkSize = chunkSize / 2;
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while (chunkSize--) {
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((uint16*)scriptData->ordr)[chunkSize] = READ_BE_UINT16(&((uint16*)scriptData->ordr)[chunkSize]);
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}
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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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if (specialPtr) {
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scriptData->mustBeFreed = 0;
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scriptData->data = specialPtr;
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specialPtr += chunkSize;
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} else {
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scriptData->mustBeFreed = 1;
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scriptData->data = new byte[chunkSize];
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}
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if (!loadIFFBlock(data, curData, size, DATA_CHUNK, scriptData->data, chunkSize)) {
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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 / 2;
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scriptData->opcodes = opcodes;
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scriptData->opcodeSize = opcodeSize;
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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->mustBeFreed) {
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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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}
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data->mustBeFreed = 0;
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data->text = data->ordr = data->data = 0;
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}
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void ScriptHelper::initScript(ScriptState *scriptStat, 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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}
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uint16 functionOffset = ((uint16*)script->dataPtr->ordr)[function];
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if (functionOffset == (uint16)-1) {
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return false;
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}
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script->ip = &script->dataPtr->data[functionOffset*2];
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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)
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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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_curScript = script;
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_parameter = 0;
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_continue = true;
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if (!_curScript->ip) {
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return false;
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}
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int16 code = READ_BE_UINT16(_curScript->ip); _curScript->ip += 2;
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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 = READ_BE_UINT16(_curScript->ip); _curScript->ip += 2;
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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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debug(5, "%s(%d)", _commands[opcode].desc, _parameter);
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(this->*(_commands[opcode].proc))();
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}
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_curScript = 0;
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return _continue;
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}
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uint32 ScriptHelper::getFORMBlockSize(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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}
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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(byte *start, 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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}
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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(byte *start, byte *&data, uint32 maxSize, const uint32 chunkName, byte *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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}
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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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}
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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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} // end of namespace Kyra
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