GT-3063 - fix sevenzip fs data dup and extreme slowness

File data would be duplicated, and was using slow method to extract
data.

Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/FileSystemService.java

@@ -15,10 +15,7 @@
  */
 package ghidra.formats.gfilesystem;
 
-import java.io.File;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
+import java.io.*;
 import java.util.List;
 
 import org.apache.commons.io.FilenameUtils;
@@ -523,11 +520,18 @@ public class FileSystemService {
 			fileCacheNameIndex.add(srcCFI.md5, derivedName, derivedFile.md5);
 		}
 		else {
-			Msg.info(null, "Found derived file in cache: " + fsrl + ", " + derivedName);
+			//Msg.info(null, "Found derived file in cache: " + fsrl + ", " + derivedName);
 		}
 		return derivedFile;
 	}
 
+	public boolean hasDerivedFile(FSRL fsrl, String derivedName, TaskMonitor monitor)
+			throws CancelledException, IOException {
+		FileCacheEntry srcCFI = getCacheFile(fsrl, monitor);
+		String derivedMD5 = fileCacheNameIndex.get(srcCFI.md5, derivedName);
+		return derivedMD5 != null;
+	}
+
 	/**
 	 * Returns true if the container file probably holds one of the currently supported
 	 * filesystem types.

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/sevenzip/SevenZipFileSystemFactory.java

@@ -0,0 +1,80 @@
+/* ###
+ * IP: GHIDRA
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ghidra.file.formats.sevenzip;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+
+import ghidra.app.util.recognizer.*;
+import ghidra.formats.gfilesystem.*;
+import ghidra.formats.gfilesystem.factory.GFileSystemFactoryWithFile;
+import ghidra.formats.gfilesystem.factory.GFileSystemProbeBytesOnly;
+import ghidra.util.exception.CancelledException;
+import ghidra.util.task.TaskMonitor;
+
+public class SevenZipFileSystemFactory
+		implements GFileSystemFactoryWithFile<SevenZipFileSystem>, GFileSystemProbeBytesOnly {
+
+	private List<Recognizer> recognizers = List.of(new SevenZipRecognizer(), new XZRecognizer(),
+		new Bzip2Recognizer(), new MSWIMRecognizer(), new ArjRecognizer(), new CabarcRecognizer(),
+		new CHMRecognizer(), new CramFSRecognizer(), new DebRecognizer(), new LhaRecognizer(),
+		new RarRecognizer(), new RPMRecognizer(), new VHDRecognizer(), new XarRecognizer(),
+		new UnixCompressRecognizer());
+
+	private final int recognizerBytesRequired;
+
+	public SevenZipFileSystemFactory() {
+		int max = 0;
+		for (Recognizer recognizer : recognizers) {
+			max = Math.max(max, recognizer.numberOfBytesRequired());
+		}
+		recognizerBytesRequired = max;
+	}
+
+	@Override
+	public int getBytesRequired() {
+		return recognizerBytesRequired;
+	}
+
+	@Override
+	public boolean probeStartBytes(FSRL containerFSRL, byte[] startBytes) {
+		for (Recognizer recognizer : recognizers) {
+			String recognized = recognizer.recognize(startBytes);
+			if (recognized != null) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	@Override
+	public SevenZipFileSystem create(FSRL containerFSRL, FSRLRoot targetFSRL, File containerFile,
+			FileSystemService fsService, TaskMonitor monitor)
+			throws IOException, CancelledException {
+
+		SevenZipFileSystem fs = new SevenZipFileSystem(targetFSRL);
+		try {
+			fs.mount(containerFile, monitor);
+			return fs;
+		}
+		catch (IOException ioe) {
+			fs.close();
+			throw ioe;
+		}
+	}
+
+}