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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 "adl/adl_v4.h"
#include "adl/detection.h"
namespace Adl {
AdlEngine_v4::AdlEngine_v4(OSystem *syst, const AdlGameDescription *gd) :
AdlEngine_v3(syst, gd),
_currentVolume(0),
_itemPicIndex(nullptr) {
}
AdlEngine_v4::~AdlEngine_v4() {
delete _itemPicIndex;
}
Common::String AdlEngine_v4::loadMessage(uint idx) const {
Common::String str = AdlEngine_v3::loadMessage(idx);
for (uint i = 0; i < str.size(); ++i) {
const char *xorStr = "AVISDURGAN";
str.setChar(str[i] ^ xorStr[i % strlen(xorStr)], i);
}
return str;
}
Common::String AdlEngine_v4::getItemDescription(const Item &item) const {
return _itemDesc[item.id - 1];
}
DiskImage *AdlEngine_v4::loadDisk(byte volume) const {
const ADGameFileDescription *ag;
for (ag = _gameDescription->desc.filesDescriptions; ag->fileName; ag++) {
if (ag->fileType == volume) {
DiskImage *disk = new DiskImage();
if (!disk->open(ag->fileName))
error("Failed to open %s", ag->fileName);
return disk;
}
}
error("Disk volume %d not found", volume);
}
void AdlEngine_v4::insertDisk(byte volume) {
delete _disk;
_disk = loadDisk(volume);
_currentVolume = volume;
}
void AdlEngine_v4::loadRegionLocations(Common::ReadStream &stream, uint regions) {
for (uint r = 0; r < regions; ++r) {
RegionLocation loc;
loc.track = stream.readByte();
loc.sector = stream.readByte();
if (stream.eos() || stream.err())
error("Failed to read region locations");
_regionLocations.push_back(loc);
}
}
void AdlEngine_v4::loadRegionInitDataOffsets(Common::ReadStream &stream, uint regions) {
for (uint r = 0; r < regions; ++r) {
RegionInitDataOffset init;
init.track = stream.readByte();
init.sector = stream.readByte();
init.offset = stream.readByte();
init.volume = stream.readByte();
if (stream.eos() || stream.err())
error("Failed to read region init data offsets");
_regionInitDataOffsets.push_back(init);
}
}
void AdlEngine_v4::initRegions(const byte *roomsPerRegion, uint regions) {
_state.regions.resize(regions);
for (uint r = 0; r < regions; ++r) {
Region ®n = _state.regions[r];
// Each region has 24 variables
regn.vars.resize(24);
regn.rooms.resize(roomsPerRegion[r]);
for (uint rm = 0; rm < roomsPerRegion[r]; ++rm) {
// TODO: hires6 uses 0xff and has slightly different
// code working on these values
regn.rooms[rm].picture = 1;
regn.rooms[rm].isFirstTime = 1;
}
}
}
void AdlEngine_v4::fixupDiskOffset(byte &track, byte §or) const {
if (_state.region == 0)
return;
sector += _regionLocations[_state.region - 1].sector;
if (sector >= 16) {
sector -= 16;
++track;
}
track += _regionLocations[_state.region - 1].track;
}
void AdlEngine_v4::adjustDataBlockPtr(byte &track, byte §or, byte &offset, byte &size) const {
fixupDiskOffset(track, sector);
}
void AdlEngine_v4::loadRegion(byte region) {
if (_currentVolume != _regionInitDataOffsets[region - 1].volume) {
insertDisk(_regionInitDataOffsets[region - 1].volume);
// FIXME: This shouldn't be needed, but currently is, due to
// implementation choices made earlier on for DataBlockPtr and DiskImage.
_state.region = 0; // To avoid region offset being applied
_itemPics.clear();
loadItemPictures(*_itemPicIndex, _itemPicIndex->size() / 5);
}
_state.region = region;
byte track = _regionInitDataOffsets[region - 1].track;
byte sector = _regionInitDataOffsets[region - 1].sector;
uint offset = _regionInitDataOffsets[region - 1].offset;
fixupDiskOffset(track, sector);
for (uint block = 0; block < 7; ++block) {
StreamPtr stream(_disk->createReadStream(track, sector, offset, 1));
uint16 addr = stream->readUint16LE();
uint16 size = stream->readUint16LE();
stream.reset(_disk->createReadStream(track, sector, offset, size / 256 + 1));
stream->skip(4);
switch (addr) {
case 0x9000: {
// Messages
_messages.clear();
uint count = size / 4;
loadMessages(*stream, count);
break;
}
case 0x4a80: {
// Global pics
_pictures.clear();
loadPictures(*stream);
break;
}
case 0x4000:
// Verbs
loadWords(*stream, _verbs, _priVerbs);
break;
case 0x1800:
// Nouns
loadWords(*stream, _nouns, _priNouns);
break;
case 0x0e00: {
// Rooms
uint count = size / 14 - 1;
stream->skip(14); // Skip invalid room 0
_state.rooms.clear();
loadRooms(*stream, count);
break;
}
case 0x7b00:
// Global commands
readCommands(*stream, _globalCommands);
break;
case 0x9500:
// Room commands
readCommands(*stream, _roomCommands);
break;
default:
error("Unknown data block found (addr %04x; size %04x)", addr, size);
}
offset += 4 + size;
while (offset >= 256) {
offset -= 256;
++sector;
if (sector >= 16) {
sector = 0;
++track;
}
}
}
}
void AdlEngine_v4::loadItemPicIndex(Common::ReadStream &stream, uint items) {
_itemPicIndex = stream.readStream(items * 5);
if (stream.eos() || stream.err())
error("Error reading item index");
}
} // End of namespace Adl
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