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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 "common/debug.h"
#include "common/str.h"
#include "common/stream.h"
#include "common/winexe_ne.h"
namespace Common {
NEResources::NEResources() {
_exe = nullptr;
}
NEResources::~NEResources() {
clear();
}
void NEResources::clear() {
if (_exe) {
delete _exe;
_exe = nullptr;
}
_resources.clear();
}
bool NEResources::loadFromEXE(SeekableReadStream *stream) {
clear();
if (!stream)
return false;
_exe = stream;
uint32 offsetResourceTable = getResourceTableOffset();
if (offsetResourceTable == 0xFFFFFFFF)
return false;
if (offsetResourceTable == 0)
return true;
if (!readResourceTable(offsetResourceTable))
return false;
return true;
}
uint32 NEResources::getResourceTableOffset() {
if (!_exe)
return 0xFFFFFFFF;
if (!_exe->seek(0))
return 0xFFFFFFFF;
// 'MZ'
if (_exe->readUint16BE() != 0x4D5A)
return 0xFFFFFFFF;
if (!_exe->seek(60))
return 0xFFFFFFFF;
uint32 offsetSegmentEXE = _exe->readUint16LE();
if (!_exe->seek(offsetSegmentEXE))
return 0xFFFFFFFF;
// 'NE'
if (_exe->readUint16BE() != 0x4E45)
return 0xFFFFFFFF;
if (!_exe->seek(offsetSegmentEXE + 36))
return 0xFFFFFFFF;
uint32 offsetResourceTable = _exe->readUint16LE();
if (offsetResourceTable == 0)
// No resource table
return 0;
// Offset relative to the segment _exe header
offsetResourceTable += offsetSegmentEXE;
if (!_exe->seek(offsetResourceTable))
return 0xFFFFFFFF;
return offsetResourceTable;
}
static const char *s_resTypeNames[] = {
"", "cursor", "bitmap", "icon", "menu", "dialog", "string",
"font_dir", "font", "accelerator", "rc_data", "msg_table",
"group_cursor", "", "group_icon", "", "version", "dlg_include",
"", "plug_play", "vxd", "ani_cursor", "ani_icon", "html",
"manifest"
};
bool NEResources::readResourceTable(uint32 offset) {
if (!_exe)
return false;
if (!_exe->seek(offset))
return false;
uint32 align = 1 << _exe->readUint16LE();
uint16 typeID = _exe->readUint16LE();
while (typeID != 0) {
// High bit of the type means integer type
WinResourceID type;
if (typeID & 0x8000)
type = typeID & 0x7FFF;
else
type = getResourceString(*_exe, offset + typeID);
uint16 resCount = _exe->readUint16LE();
_exe->skip(4); // reserved
for (int i = 0; i < resCount; i++) {
Resource res;
// Resource properties
res.offset = _exe->readUint16LE() * align;
res.size = _exe->readUint16LE() * align;
res.flags = _exe->readUint16LE();
uint16 id = _exe->readUint16LE();
res.handle = _exe->readUint16LE();
res.usage = _exe->readUint16LE();
res.type = type;
// High bit means integer type
if (id & 0x8000)
res.id = id & 0x7FFF;
else
res.id = getResourceString(*_exe, offset + id);
if (typeID & 0x8000 && ((typeID & 0x7FFF) < ARRAYSIZE(s_resTypeNames)) && s_resTypeNames[typeID & 0x7FFF][0] != 0)
debug(2, "Found resource %s %s", s_resTypeNames[typeID & 0x7FFF], res.id.toString().c_str());
else
debug(2, "Found resource %s %s", type.toString().c_str(), res.id.toString().c_str());
_resources.push_back(res);
}
typeID = _exe->readUint16LE();
}
return true;
}
String NEResources::getResourceString(SeekableReadStream &exe, uint32 offset) {
uint32 curPos = exe.pos();
if (!exe.seek(offset)) {
exe.seek(curPos);
return "";
}
uint8 length = exe.readByte();
String string;
for (uint16 i = 0; i < length; i++)
string += (char)exe.readByte();
exe.seek(curPos);
return string;
}
const NEResources::Resource *NEResources::findResource(const WinResourceID &type, const WinResourceID &id) const {
for (List<Resource>::const_iterator it = _resources.begin(); it != _resources.end(); ++it)
if (it->type == type && it->id == id)
return &*it;
return nullptr;
}
SeekableReadStream *NEResources::getResource(const WinResourceID &type, const WinResourceID &id) {
const Resource *res = findResource(type, id);
if (!res)
return nullptr;
_exe->seek(res->offset);
return _exe->readStream(res->size);
}
const Array<WinResourceID> NEResources::getIDList(const WinResourceID &type) const {
Array<WinResourceID> idArray;
for (List<Resource>::const_iterator it = _resources.begin(); it != _resources.end(); ++it)
if (it->type == type)
idArray.push_back(it->id);
return idArray;
}
} // End of namespace Common
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