COMMON: Add basic PE EXE parser

Much thanks to fuzzie for her assistance

1 files changed, 297 insertions, 0 deletions

diff --git a/common/pe_exe.cpp b/common/pe_exe.cpp
new file mode 100644
index 0000000000..d4aa4bcf49
--- /dev/null
+++ b/common/pe_exe.cpp
@@ -0,0 +1,297 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "common/debug.h"
+#include "common/file.h"
+#include "common/memstream.h"
+#include "common/pe_exe.h"
+#include "common/str.h"
+#include "common/stream.h"
+
+namespace Common {
+
+PEResourceID &PEResourceID::operator=(String string) {
+	_name = string;
+	_idType = kIDTypeString;
+	return *this;
+}
+
+PEResourceID &PEResourceID::operator=(uint32 x) {
+	_id = x;
+	_idType = kIDTypeNumerical;
+	return *this;
+}
+
+bool PEResourceID::operator==(const String &x) const {
+	return _idType == kIDTypeString && _name.equalsIgnoreCase(x);
+}
+
+bool PEResourceID::operator==(const uint32 &x) const {
+	return _idType == kIDTypeNumerical && _id == x;
+}
+
+bool PEResourceID::operator==(const PEResourceID &x) const {
+	if (_idType != x._idType)
+		return false;
+	if (_idType == kIDTypeString)
+		return _name.equalsIgnoreCase(x._name);
+	if (_idType == kIDTypeNumerical)
+		return _id == x._id;
+	return true;
+}
+
+String PEResourceID::getString() const {
+	if (_idType != kIDTypeString)
+		return "";
+
+	return _name;
+}
+
+uint32 PEResourceID::getID() const {
+	if (_idType != kIDTypeNumerical)
+		return 0xffffffff;
+
+	return _idType;
+}
+
+String PEResourceID::toString() const {
+	if (_idType == kIDTypeString)
+		return _name;
+	else if (_idType == kIDTypeNumerical)
+		return String::format("%08x", _id);
+
+	return "";
+}
+
+PEResources::PEResources() {
+	_exe = 0;
+}
+
+PEResources::~PEResources() {
+	clear();
+}
+
+void PEResources::clear() {
+	_sections.clear();
+	_resources.clear();
+	delete _exe; _exe = 0;
+}
+
+bool PEResources::loadFromEXE(const String &fileName) {
+	if (fileName.empty())
+		return false;
+
+	File *file = new File();
+
+	if (!file->open(fileName)) {
+		delete file;
+		return false;
+	}
+
+	return loadFromEXE(file);
+}
+
+bool PEResources::loadFromEXE(SeekableReadStream *stream) {
+	clear();
+
+	if (!stream)
+		return false;
+
+	if (stream->readUint16BE() != 'MZ')
+		return false;
+
+	stream->skip(58);
+
+	uint32 peOffset = stream->readUint32LE();
+
+	if (!peOffset || peOffset >= (uint32)stream->size())
+		return false;
+
+	stream->seek(peOffset);
+
+	if (stream->readUint32BE() != MKID_BE('PE\0\0'))
+		return false;
+
+	stream->skip(2);
+	uint16 sectionCount = stream->readUint16LE();
+	stream->skip(12);
+	uint16 optionalHeaderSize = stream->readUint16LE();
+	stream->skip(optionalHeaderSize + 2);
+
+	// Read in all the sections
+	for (uint16 i = 0; i < sectionCount; i++) {
+		char sectionName[9];
+		stream->read(sectionName, 8);
+		sectionName[8] = 0;
+
+		Section section;
+		stream->skip(4);
+		section.virtualAddress = stream->readUint32LE();
+		section.size = stream->readUint32LE();
+		section.offset = stream->readUint32LE();
+		stream->skip(16);
+
+		_sections[sectionName] = section;
+	}
+
+	// Currently, we require loading a resource section
+	if (!_sections.contains(".rsrc")) {
+		clear();
+		return false;
+	}
+
+	_exe = stream;
+
+	Section &resSection = _sections[".rsrc"];
+	parseResourceLevel(resSection, resSection.offset, 0);
+
+	return true;
+}
+
+void PEResources::parseResourceLevel(Section &section, uint32 offset, int level) {
+	_exe->seek(offset + 12);
+
+	uint16 namedEntryCount = _exe->readUint16LE();
+	uint16 intEntryCount = _exe->readUint16LE();
+
+	for (uint32 i = 0; i < namedEntryCount + intEntryCount; i++) {
+		uint32 value = _exe->readUint32LE();
+
+		PEResourceID id;
+
+		if (value & 0x80000000) {
+			value &= 0x7fffffff;
+
+			uint32 startPos = _exe->pos();
+			_exe->seek(section.offset + (value & 0x7fffffff));
+
+			// Read in the name, truncating from unicode to ascii
+			Common::String name;
+			uint16 nameLength = _exe->readUint16LE();
+			while (nameLength--)
+				name += (char)(_exe->readUint16LE() & 0xff);
+
+			_exe->seek(startPos);
+
+			id = name;
+		} else {
+			id = value;
+		}
+
+		uint32 nextOffset = _exe->readUint32LE();
+		uint32 lastOffset = _exe->pos();
+
+		if (level == 0)
+			_curType = id;
+		else if (level == 1)
+			_curName = id;
+		else if (level == 2)
+			_curLang = id;
+
+		if (level < 2) {
+			// Time to dive down further
+			parseResourceLevel(section, section.offset + (nextOffset & 0x7fffffff), level + 1);
+		} else {
+			_exe->seek(section.offset + nextOffset);
+
+			Resource resource;
+			resource.offset = _exe->readUint32LE() + section.offset - section.virtualAddress;
+			resource.size = _exe->readUint32LE();
+
+			debug(4, "Found resource '%s' '%s' '%s' at %d of size %d", _curType.toString().c_str(),
+					_curName.toString().c_str(), _curLang.toString().c_str(), resource.offset, resource.size);
+
+			_resources[_curType][_curName][_curLang] = resource;
+		}
+
+		_exe->seek(lastOffset);
+	}
+}
+
+const Array<PEResourceID> PEResources::getTypeList() const {
+	Array<PEResourceID> array;
+
+	if (!_exe)
+		return array;
+
+	for (TypeMap::const_iterator it = _resources.begin(); it != _resources.end(); it++)
+		array.push_back(it->_key);
+
+	return array;
+}
+
+const Array<PEResourceID> PEResources::getNameList(const PEResourceID &type) const {
+	Array<PEResourceID> array;
+
+	if (!_exe || !_resources.contains(type))
+		return array;
+
+	const NameMap &nameMap = _resources[type];
+
+	for (NameMap::const_iterator it = nameMap.begin(); it != nameMap.end(); it++)
+		array.push_back(it->_key);
+
+	return array;
+}
+
+const Array<PEResourceID> PEResources::getLangList(const PEResourceID &type, const PEResourceID &name) const {
+	Array<PEResourceID> array;
+
+	if (!_exe || !_resources.contains(type))
+		return array;
+
+	const NameMap &nameMap = _resources[type];
+
+	if (!nameMap.contains(name))
+		return array;
+
+	const LangMap &langMap = nameMap[name];
+
+	for (LangMap::const_iterator it = langMap.begin(); it != langMap.end(); it++)
+		array.push_back(it->_key);
+
+	return array;
+}
+
+SeekableReadStream *PEResources::getResource(const PEResourceID &type, const PEResourceID &name, const PEResourceID &lang) {
+	if (!_exe || !_resources.contains(type))
+		return 0;
+
+	const NameMap &nameMap = _resources[type];
+
+	if (!nameMap.contains(name))
+		return 0;
+
+	const LangMap &langMap = nameMap[name];
+
+	if (!langMap.contains(lang))
+		return 0;
+
+	const Resource &resource = langMap[lang];
+	_exe->seek(resource.offset);
+	return _exe->readStream(resource.size);
+}
+
+} // End of namespace Common