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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "director/lingo/lingo.h"
namespace Director {
static struct LingoV4Bytecode {
const uint8 opcode;
const inst func;
const char *args;
} lingoV4[] = {
{ 0x03, Lingo::c_voidpush, "" },
{ 0x04, Lingo::c_mul, "" },
{ 0x05, Lingo::c_add, "" },
{ 0x06, Lingo::c_sub, "" },
{ 0x07, Lingo::c_div, "" },
{ 0x08, Lingo::c_mod, "" },
{ 0x09, Lingo::c_negate, "" },
{ 0x0a, Lingo::c_ampersand, "" },
{ 0x0b, Lingo::c_concat, "" },
{ 0x0c, Lingo::c_lt, "" },
{ 0x0d, Lingo::c_le, "" },
{ 0x0e, Lingo::c_neq, "" },
{ 0x0f, Lingo::c_eq, "" },
{ 0x10, Lingo::c_gt, "" },
{ 0x11, Lingo::c_ge, "" },
{ 0x12, Lingo::c_and, "" },
{ 0x13, Lingo::c_or, "" },
{ 0x14, Lingo::c_not, "" },
{ 0x15, Lingo::c_contains, "" },
{ 0x16, Lingo::c_starts, "" },
{ 0x17, Lingo::c_of, "" },
{ 0x18, Lingo::c_hilite, "" },
{ 0x19, Lingo::c_intersects, "" },
{ 0x1a, Lingo::c_within, "" },
{ 0x1b, Lingo::c_field, "" },
{ 0x1c, Lingo::c_tell, "" },
{ 0x1d, Lingo::c_telldone, "" },
{ 0x41, Lingo::c_intpush, "b" },
{ 0, 0, 0 }
};
void Lingo::initBytecode() {
for (LingoV4Bytecode *op = lingoV4; op->opcode; op++) {
_lingoV4[op->opcode] = new Opcode( op->func, op->args );
}
}
void Lingo::addCodeV4(Common::SeekableSubReadStreamEndian &stream, ScriptType type, uint16 id) {
debugC(1, kDebugLingoCompile, "Add V4 bytecode for type %s with id %d", scriptType2str(type), id);
if (_scripts[type].contains(id)) {
delete _scripts[type][id];
}
_currentScript = new ScriptData;
_currentScriptType = type;
_scripts[type][id] = _currentScript;
_currentEntityId = id;
// read the Lscr header!
// unk1
for (uint32 i = 0; i < 0x10; i++) {
stream.readByte();
}
uint16 code_store_offset = stream.readUint16();
// unk2
for (uint32 i = 0; i < 0x2e; i++) {
stream.readByte();
}
uint16 functions_offset = stream.readUint16();
// unk3
for (uint32 i = 0; i < 0x6; i++) {
stream.readByte();
}
uint16 functions_count = stream.readUint16();
uint16 unk4 = stream.readUint16();
uint16 unk5 = stream.readUint16();
uint16 consts_count = stream.readUint16();
stream.readUint16();
uint16 consts_offset = stream.readUint16();
stream.readUint16();
uint16 unk6 = stream.readUint16();
stream.readUint16();
uint16 consts_base = stream.readUint16();
// preload all the constants!
// these are stored as a reference table of 6 byte entries, followed by a storage area.
// copy the storage area first.
uint32 consts_store_offset = consts_offset+6*consts_count;
uint32 consts_store_size = stream.size()-consts_store_offset;
stream.seek(consts_store_offset);
byte *const_store = (byte *)malloc(consts_store_size);
stream.read(const_store, consts_store_size);
Common::Array<Datum> const_data;
// read each entry in the reference table.
stream.seek(consts_offset);
for (uint16 i=0; i<consts_count; i++) {
Datum constant;
uint16 const_type = stream.readUint16();
uint32 value = stream.readUint32();
switch (const_type) {
case 1: { // String type
constant.type = STRING;
constant.u.s = new Common::String();
if (value < consts_store_offset) {
warning("Constant string start offset is out of bounds!");
break;
}
uint32 pointer = value - consts_store_offset;
while (pointer < consts_store_size) {
if (const_store[pointer] == '\r') {
constant.u.s += '\n';
} else if (const_store[pointer] == '\0') {
break;
} else {
constant.u.s += const_store[pointer];
}
pointer += 1;
}
if (pointer == consts_store_size) {
warning("Constant string has no null terminator!");
break;
}
}
break;
case 4: // Integer type
constant.type = INT;
constant.u.i = (int)value;
break;
case 9: { // Float type
constant.type = FLOAT;
if (value < consts_store_offset) {
warning("Constant float start offset is out of bounds!");
break;
} else if (value+4 > consts_store_offset + consts_store_size) {
warning("Constant float end offset is out of bounds!");
break;
}
constant.u.f = *(float *)(const_store+value-consts_store_offset);
}
break;
default:
warning("Unknown constant type %d", type);
break;
}
const_data.push_back(constant);
}
free(const_store);
// parse each function!
// these are stored as a code storage area, followed by a reference table of 42 byte entries.
// copy the storage area first.
uint32 code_store_size = functions_offset - code_store_offset;
stream.seek(code_store_offset);
byte *code_store = (byte *)malloc(code_store_size);
stream.read(code_store, code_store_size);
// read each entry in the function table.
stream.seek(functions_offset);
for (uint16 i=0; i<functions_count; i++) {
stream.readUint16();
stream.readUint16();
stream.readUint16();
stream.readUint16();
stream.readUint16();
stream.readUint16();
uint16 arg_count = stream.readUint16();
stream.readUint16();
stream.readUint16();
uint16 var_count = stream.readUint16();
stream.readUint16();
stream.readUint16();
uint16 name_index = stream.readUint16();
stream.readUint16();
stream.readUint16();
uint16 length = stream.readUint16();
stream.readUint16();
uint16 start_offset = stream.readUint16();
stream.readUint16();
stream.readUint16();
uint16 end_offset = stream.readUint16();
if (start_offset < code_store_offset) {
warning("Function %d start offset is out of bounds!", i);
continue;
} else if (end_offset >= code_store_offset+code_store_size) {
warning("Function %d end offset is out of bounds!", i);
continue;
}
uint32 pointer = start_offset-code_store_offset;
Common::Array<uint32> offset_list;
while (pointer < end_offset-code_store_offset) {
uint8 opcode = code_store[pointer];
pointer += 1;
if (_lingoV4.contains(opcode)) {
offset_list.push_back(_currentScript->size());
_currentScript->push_back(_lingoV4[opcode]->func);
} else {
// unimplemented instruction
inst op_value = 0;
WRITE_UINT32(&op_value, opcode);
if (opcode < 0x40) {
offset_list.push_back(_currentScript->size());
_currentScript->push_back(Lingo::c_nop);
_currentScript->push_back(op_value);
} else if (opcode < 0x80) {
offset_list.push_back(_currentScript->size());
_currentScript->push_back(Lingo::c_nop1);
_currentScript->push_back(op_value);
inst arg1 = 0;
WRITE_UINT32(&arg1, code_store[pointer]);
offset_list.push_back(_currentScript->size());
_currentScript->push_back(arg1);
pointer += 1;
} else {
offset_list.push_back(_currentScript->size());
_currentScript->push_back(Lingo::c_nop2);
_currentScript->push_back(op_value);
inst arg1 = 0;
WRITE_UINT32(&arg1, code_store[pointer]);
offset_list.push_back(_currentScript->size());
_currentScript->push_back(arg1);
inst arg2 = 0;
WRITE_UINT32(&arg2, code_store[pointer+1]);
offset_list.push_back(_currentScript->size());
_currentScript->push_back(arg2);
pointer += 2;
}
}
}
}
}
}
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