AGOS: Add an archive class for handling InstallShield Cabinets

1 files changed, 201 insertions, 0 deletions

diff --git a/engines/agos/installshield_cab.cpp b/engines/agos/installshield_cab.cpp
new file mode 100644
index 0000000000..a8b5d0fba2
--- /dev/null
+++ b/engines/agos/installshield_cab.cpp
@@ -0,0 +1,201 @@
+/* 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.
+ *
+ */
+
+// The following code is based on unshield
+// Original copyright:
+
+// Copyright (c) 2003 David Eriksson <twogood@users.sourceforge.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+// of the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include "agos/installshield_cab.h"
+
+#include "common/debug.h"
+#include "common/memstream.h"
+#include "common/zlib.h"
+
+namespace AGOS {
+
+InstallShieldCabinet::InstallShieldCabinet() : Common::Archive() {
+	_stream = 0;
+}
+
+InstallShieldCabinet::~InstallShieldCabinet() {
+	close();
+}
+
+bool InstallShieldCabinet::open(const Common::String &filename) {
+	close();
+
+	_stream = SearchMan.createReadStreamForMember(filename);
+
+	if (!_stream)
+		return false;
+
+	// Note that we only support a limited subset of cabinet files
+	// Only single cabinet files and ones without data shared between
+	// cabinets.
+
+	// Check for the magic uint32
+	if (_stream->readUint32LE() != 0x28635349) {
+		close();
+		return false;
+	}
+
+	uint32 version = _stream->readUint32LE();
+
+	if (version != 0x01000004) {
+		warning("Unsupported CAB version %08x", version);
+		close();
+		return false;
+	}
+
+	/* uint32 volumeInfo = */ _stream->readUint32LE();
+	uint32 cabDescriptorOffset = _stream->readUint32LE();
+	/* uint32 cabDescriptorSize = */ _stream->readUint32LE();
+
+	_stream->seek(cabDescriptorOffset);
+
+	_stream->skip(12);
+	uint32 fileTableOffset = _stream->readUint32LE();
+	_stream->skip(4);
+	uint32 fileTableSize = _stream->readUint32LE();
+	uint32 fileTableSize2 = _stream->readUint32LE();
+	uint32 directoryCount = _stream->readUint32LE();
+	_stream->skip(8);
+	uint32 fileCount = _stream->readUint32LE();
+
+	if (fileTableSize != fileTableSize2)
+		warning("file table sizes do not match");
+
+	// We're ignoring file groups and components since we
+	// should not need them. Moving on to the files...
+
+	_stream->seek(cabDescriptorOffset + fileTableOffset);
+	uint32 fileTableCount = directoryCount + fileCount;
+	uint32 *fileTableOffsets = new uint32[fileTableCount];
+	for (uint32 i = 0; i < fileTableCount; i++)
+		fileTableOffsets[i] = _stream->readUint32LE();
+
+	for (uint32 i = directoryCount; i < fileCount + directoryCount; i++) {
+		_stream->seek(cabDescriptorOffset + fileTableOffset + fileTableOffsets[i]);
+		uint32 nameOffset = _stream->readUint32LE();
+		/* uint32 directoryIndex = */ _stream->readUint32LE();
+
+		// First read in data needed by us to get at the file data
+		FileEntry entry;
+		entry.flags = _stream->readUint16LE();
+		entry.uncompressedSize = _stream->readUint32LE();
+		entry.compressedSize = _stream->readUint32LE();
+		_stream->skip(20);
+		entry.offset = _stream->readUint32LE();
+
+		// Then let's get the string
+		_stream->seek(cabDescriptorOffset + fileTableOffset + nameOffset);
+		Common::String fileName;
+
+		char c = _stream->readByte();
+		while (c) {
+			fileName += c;
+			c = _stream->readByte();
+		}
+
+		_map[fileName] = entry;
+	}
+
+	delete[] fileTableOffsets;
+
+	return true;
+}
+
+void InstallShieldCabinet::close() {
+	delete _stream; _stream = 0;
+	_map.clear();
+}
+
+bool InstallShieldCabinet::hasFile(const Common::String &name) {
+	return _map.contains(name);
+}
+
+int InstallShieldCabinet::listMembers(Common::ArchiveMemberList &list) {
+	for (FileMap::const_iterator it = _map.begin(); it != _map.end(); it++)
+		list.push_back(getMember(it->_key));
+
+	return _map.size();
+}
+
+Common::ArchiveMemberPtr InstallShieldCabinet::getMember(const Common::String &name) {
+	return Common::ArchiveMemberPtr(new Common::GenericArchiveMember(name, this));
+}
+
+Common::SeekableReadStream *InstallShieldCabinet::createReadStreamForMember(const Common::String &name) const {
+	if (!_stream || !_map.contains(name))
+		return 0;
+
+	const FileEntry &entry = _map[name];
+
+	_stream->seek(entry.offset);
+
+	if (!(entry.flags & 0x04)) {
+		// Not compressed
+		return _stream->readStream(entry.uncompressedSize);
+	}
+
+#ifdef USE_ZLIB
+	byte *src = (byte *)malloc(entry.compressedSize);
+	byte *dst = (byte *)malloc(entry.uncompressedSize);
+
+	_stream->read(src, entry.compressedSize);
+
+	bool result = Common::inflateZlibHeaderless(dst, entry.uncompressedSize, src, entry.compressedSize);
+	free(src);
+
+	if (!result) {
+		warning("failed to inflate CAB file '%s'", name.c_str());
+		free(dst);
+		return 0;
+	}
+
+	return new Common::MemoryReadStream(dst, entry.uncompressedSize, DisposeAfterUse::YES);
+#else
+	warning("zlib required to extract compressed CAB file '%s'", name.c_str());
+	return 0;
+#endif
+}
+
+} // End of namespace AGOS