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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.
*
*/
/*
* Based on
* WebVenture (c) 2010, Sean Kasun
* https://github.com/mrkite/webventure, http://seancode.com/webventure/
*
* Used with explicit permission from the author
*/
#include "macventure/text.h"
namespace MacVenture {
TextAsset::TextAsset(MacVentureEngine *engine, ObjID objid, ObjID source, ObjID target, Container *container, bool isOld, const HuffmanLists *huffman) {
_id = objid;
_sourceObj = source;
_targetObj = target;
_container = container;
_huffman = huffman;
_isOld = isOld;
_engine = engine;
if (_isOld) {
decodeOld();
} else {
decodeHuffman();
}
}
void TextAsset::decodeOld() {
Common::SeekableReadStream *res = _container->getItem(_id);
uint16 strLen = res->readUint16BE();
Common::BitStream32BELSB stream(res, DisposeAfterUse::YES);
char *str = new char[strLen + 1];
bool lowercase = false;
char c = ' ';
for (uint16 i = 0; i < strLen; i++) {
char val = stream.getBits(5);
if (val == 0x0) { // Space
c = ' ';
} else if (val >= 0x1 && val <= 0x1A) {
if (lowercase) { // Ascii a-z
c = val + 0x60;
} else { // Ascii A-Z
c = val + 0x40;
}
lowercase = true;
} else if (val == 0x1B) {
if (lowercase) {
c = '.';
} else {
c = ',';
}
lowercase = true;
} else if (val == 0x1C) {
if (lowercase) {
c = '\'';
} else {
c = '"';
}
lowercase = true;
} else if (val == 0x1D) { // Composite
ObjID subval = stream.getBits(16);
Common::String child;
if (subval & 0x8000) {
// Composite object id
subval ^= 0xFFFF;
child = getNoun(subval);
} else {
// Just another id
// HACK, see below in getNoun()
child = *TextAsset(_engine, subval, _sourceObj, _targetObj, _container, _isOld, _huffman).decode();
}
if (child.size() > 0) {
c = '?'; // HACK Will fix later, should append
}
lowercase = true;
} else if (val == 0x1E) {
c = stream.getBits(8);
lowercase = true;
} else if (val == 0x1F) {
lowercase = !lowercase;
} else {
warning("Unrecognized char in old text %d, pos %d", _id, i);
}
str[i] = c;
}
str[strLen] = '\0';
debugC(3, kMVDebugText, "Decoded string [%d] (old encoding): %s", _id, str);
_decoded = Common::String(str);
}
void TextAsset::decodeHuffman() {
_decoded = Common::String("");
Common::SeekableReadStream *res = _container->getItem(_id);
Common::BitStream8MSB stream(res, DisposeAfterUse::YES);
uint16 strLen = 0;
if (stream.getBit()) {
strLen = stream.getBits(15);
} else {
strLen = stream.getBits(7);
}
uint32 mask = 0;
uint32 symbol = 0;
char c;
for (uint16 i = 0; i < strLen; i++) {
mask = stream.peekBits(16);
uint32 entry;
// Find the length index
for (entry = 0; entry < _huffman->getNumEntries(); entry++) {
if (mask < _huffman->getMask(entry)) {
break;
}
}
stream.skip(_huffman->getLength(entry));
symbol = _huffman->getSymbol(entry);
if (symbol == 1) { // 7-bit ascii
c = stream.getBits(7);
_decoded += c;
} else if (symbol == 2) { // Composite
if (stream.getBit()) { // TextID
ObjID embedId = stream.getBits(15);
uint pos = stream.pos(); // HACK, part 1
TextAsset embedded(_engine, embedId, _sourceObj, _targetObj, _container, _isOld, _huffman);
stream.rewind();// HACK, part 2
stream.skip(pos);
_decoded.replace(_decoded.end(), _decoded.end(), *embedded.decode());
// Another HACK, to get around that EOS char I insert at the end
_decoded.replace(_decoded.end() - 1, _decoded.end(), "");
} else { //Composite obj string
ObjID embedId = stream.getBits(8);
uint pos = stream.pos(); // HACK, part 1
_decoded.replace(_decoded.end(), _decoded.end(), getNoun(embedId));
stream.rewind();// HACK, part 2
stream.skip(pos);
// Another HACK, to get around that EOS char I insert at the end
_decoded.replace(_decoded.end() - 1, _decoded.end(), "");
}
} else { // Plain ascii
c = symbol & 0xFF;
_decoded.replace(_decoded.end(), _decoded.end(), Common::String(c));
}
}
_decoded += '\0';
debugC(3, kMVDebugText, "Decoded string [%d] (new encoding): %s", _id, _decoded.c_str());
}
Common::String TextAsset::getNoun(ObjID subval) {
ObjID obj;
Common::String name;
if (subval & 8) {
obj = _targetObj;
} else {
obj = _sourceObj;
}
if ((subval & 3) == 1) {
uint idx = _engine->getPrefixNdx(obj);
idx = ((idx >> 4) & 3) + 1;
name = _engine->getNoun(idx);
} else {
// HACK, there should be a pool of assets or something like in the GUI
name = *TextAsset(_engine, obj, _sourceObj, _targetObj, _container, _isOld, _huffman).decode();
switch (subval & 3) {
case 2:
name = _engine->getPrefixString(0, obj) + name;
break;
case 3:
name = _engine->getPrefixString(2, obj) + name;
break;
default:
break;
}
}
if (name.size() && (subval & 4)) {
Common::String tmp = name;
name.toUppercase();
name.replace(1, name.size() - 1, tmp, 1, tmp.size() - 1);
}
return name;
}
} // End of namespace MacVenture
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