GP-907 Add getByteProvider(GFile) to some file systems.

This commit adds getByteProvider(GFile) to a first batch of filesystems.  Remaining filesystems will be addressed in future commits.

Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/ByteArrayProvider.java

@@ -17,6 +17,8 @@ package ghidra.app.util.bin;
 
 import java.io.*;
 
+import ghidra.formats.gfilesystem.FSRL;
+
 /**
  * An implementation of {@link ByteProvider} where the underlying bytes are supplied by a static 
  * byte array.
@@ -26,6 +28,7 @@ import java.io.*;
 public class ByteArrayProvider implements ByteProvider {
 	private byte[] srcBytes;
 	private String name;
+	private FSRL fsrl;
 
 	/**
 	 * Constructs a {@link ByteArrayProvider} using the specified byte array
@@ -33,7 +36,18 @@ public class ByteArrayProvider implements ByteProvider {
 	 * @param bytes the underlying byte array
 	 */
 	public ByteArrayProvider(byte[] bytes) {
+		this(bytes, null);
+	}
+
+	/**
+	 * Constructs a {@link ByteArrayProvider} using the specified byte array
+	 * 
+	 * @param bytes the underlying byte array
+	 * @param fsrl FSRL identity of the file
+	 */
+	public ByteArrayProvider(byte[] bytes, FSRL fsrl) {
 		this.srcBytes = bytes;
+		this.fsrl = fsrl;
 	}
 
 	/**
@@ -52,6 +66,11 @@ public class ByteArrayProvider implements ByteProvider {
 		// don't do anything for now
 	}
 
+	@Override
+	public FSRL getFSRL() {
+		return fsrl;
+	}
+
 	@Override
 	public File getFile() {
 		return null;

Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/ByteProviderWrapper.java

@@ -17,6 +17,8 @@ package ghidra.app.util.bin;
 
 import java.io.*;
 
+import ghidra.formats.gfilesystem.FSRL;
+
 /**
  * Creates a {@link ByteProvider} constrained to a sub-section of an existing {@link ByteProvider}.
  */
@@ -24,6 +26,7 @@ public class ByteProviderWrapper implements ByteProvider {
 	private ByteProvider provider;
 	private long subOffset;
 	private long subLength;
+	private FSRL fsrl;
 
 	/**
 	 * Constructs a {@link ByteProviderWrapper} around the specified {@link ByteProvider}
@@ -34,9 +37,23 @@ public class ByteProviderWrapper implements ByteProvider {
 	 * @param subLength the length of the new {@link ByteProviderWrapper} 
 	 */
 	public ByteProviderWrapper(ByteProvider provider, long subOffset, long subLength) {
+		this(provider, subOffset, subLength, null);
+	}
+
+	/**
+	 * Constructs a {@link ByteProviderWrapper} around the specified {@link ByteProvider}
+	 * 
+	 * @param provider the {@link ByteProvider} to wrap
+	 * @param subOffset the offset in the {@link ByteProvider} of where to start the new
+	 *   {@link ByteProviderWrapper} 
+	 * @param subLength the length of the new {@link ByteProviderWrapper} 
+	 * @param fsrl FSRL identity of the file this ByteProvider represents
+	 */
+	public ByteProviderWrapper(ByteProvider provider, long subOffset, long subLength, FSRL fsrl) {
 		this.provider = provider;
 		this.subOffset = subOffset;
 		this.subLength = subLength;
+		this.fsrl = fsrl;
 	}
 
 	@Override
@@ -44,6 +61,11 @@ public class ByteProviderWrapper implements ByteProvider {
 		// don't do anything for now
 	}
 
+	@Override
+	public FSRL getFSRL() {
+		return fsrl;
+	}
+
 	@Override
 	public File getFile() {
 		return provider.getFile();
@@ -51,7 +73,7 @@ public class ByteProviderWrapper implements ByteProvider {
 
 	@Override
 	public InputStream getInputStream(long index) throws IOException {
-		return provider.getInputStream(subOffset + index);
+		return new ByteProviderInputStream(this, index, subLength - index);
 	}
 
 	@Override

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

@@ -59,6 +59,16 @@ public class SingleFileSystemIndexHelper {
 		payloadFile = null;
 	}
 
+	/**
+	 * Returns true if the specified file is the payload file.
+	 * 
+	 * @param file GFile to test
+	 * @return boolean true if it is the payload file
+	 */
+	public boolean isPayloadFile(GFile file) {
+		return payloadFile.equals(file);
+	}
+
 	/**
 	 * Returns true if this object has been {@link #clear()}'ed.
 	 *

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/coff/CoffArchiveFileSystem.java

@@ -20,7 +20,7 @@ import java.io.InputStream;
 import java.util.*;
 
 import ghidra.app.util.bin.ByteProvider;
-import ghidra.app.util.bin.ByteProviderInputStream;
+import ghidra.app.util.bin.ByteProviderWrapper;
 import ghidra.app.util.bin.format.coff.CoffException;
 import ghidra.app.util.bin.format.coff.archive.CoffArchiveHeader;
 import ghidra.app.util.bin.format.coff.archive.CoffArchiveMemberHeader;
@@ -77,9 +77,15 @@ public class CoffArchiveFileSystem implements GFileSystem {
 	public InputStream getInputStream(GFile file, TaskMonitor monitor)
 			throws IOException, CancelledException {
 
+		ByteProvider bp = getByteProvider(file, monitor);
+		return bp != null ? bp.getInputStream(0) : null;
+	}
+
+	public ByteProvider getByteProvider(GFile file, TaskMonitor monitor) {
 		CoffArchiveMemberHeader entry = fsih.getMetadata(file);
 		return (entry != null && entry.isCOFF())
-				? new ByteProviderInputStream(provider, entry.getPayloadOffset(), entry.getSize())
+				? new ByteProviderWrapper(provider, entry.getPayloadOffset(), entry.getSize(),
+					file.getFSRL())
 				: null;
 	}
 

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/complzss/CompLzssFileSystem.java

@@ -16,71 +16,91 @@
 package ghidra.file.formats.complzss;
 
 import java.io.*;
-import java.util.*;
+import java.util.List;
 
+import ghidra.app.util.bin.ByteArrayProvider;
 import ghidra.app.util.bin.ByteProvider;
 import ghidra.file.formats.lzss.LzssCodec;
 import ghidra.file.formats.lzss.LzssConstants;
 import ghidra.formats.gfilesystem.*;
 import ghidra.formats.gfilesystem.annotations.FileSystemInfo;
-import ghidra.formats.gfilesystem.factory.GFileSystemBaseFactory;
+import ghidra.util.HashUtilities;
 import ghidra.util.exception.CancelledException;
-import ghidra.util.exception.CryptoException;
 import ghidra.util.task.TaskMonitor;
 
-@FileSystemInfo(type = "lzss", description = "LZSS Compression", factory = GFileSystemBaseFactory.class)
-public class CompLzssFileSystem extends GFileSystemBase {
+@FileSystemInfo(type = "lzss", description = "LZSS Compression", factory = CompLzssFileSystemFactory.class)
+public class CompLzssFileSystem implements GFileSystem {
+	private FSRLRoot fsFSRL;
+	private SingleFileSystemIndexHelper fsIndex;
+	private FileSystemRefManager fsRefManager = new FileSystemRefManager(this);
+	private ByteProvider payloadProvider;
 
-	private static final String NAME = "lzss_decompressed";
-
-	private GFileImpl decompressedFile;
-	private byte[] decompressedBytes;
-
-	public CompLzssFileSystem(String fileSystemName, ByteProvider provider) {
-		super(fileSystemName, provider);
-	}
-
-	@Override
-	public void close() throws IOException {
-		decompressedFile = null;
-		decompressedBytes = null;
-	}
-
-	@Override
-	protected InputStream getData(GFile file, TaskMonitor monitor)
-			throws IOException, CancelledException, CryptoException {
-		if (file != null && file.equals(decompressedFile)) {
-			return new ByteArrayInputStream(decompressedBytes);
-		}
-		return null;
-	}
-
-	@Override
-	public List<GFile> getListing(GFile directory) throws IOException {
-		return (directory == null || directory.equals(root)) ? Arrays.asList(decompressedFile)
-				: Collections.emptyList();
-	}
-
-	@Override
-	public boolean isValid(TaskMonitor monitor) throws IOException {
-		byte[] compressionBytes = provider.readBytes(0, 4);
-		byte[] lzssBytes = provider.readBytes(4, 4);
-
-		return Arrays.equals(compressionBytes, LzssConstants.SIGNATURE_COMPRESSION_BYTES) &&
-			Arrays.equals(lzssBytes, LzssConstants.SIGNATURE_LZSS_BYTES);
-	}
-
-	@Override
-	public void open(TaskMonitor monitor) throws IOException, CryptoException, CancelledException {
+	public CompLzssFileSystem(FSRLRoot fsrl, ByteProvider provider, TaskMonitor monitor)
+			throws IOException {
 		monitor.setMessage("Decompressing LZSS...");
+
 		byte[] compressedBytes = provider.readBytes(LzssConstants.HEADER_LENGTH,
 			provider.length() - LzssConstants.HEADER_LENGTH);
 		ByteArrayOutputStream decompressedBOS = new ByteArrayOutputStream();
 		LzssCodec.decompress(decompressedBOS, new ByteArrayInputStream(compressedBytes));
-		decompressedBytes = decompressedBOS.toByteArray();
-		decompressedFile =
-			GFileImpl.fromFilename(this, root, NAME, false, decompressedBytes.length, null);
-		debug(decompressedBytes, NAME);
+		byte[] decompressedBytes = decompressedBOS.toByteArray();
+
+		String md5 = HashUtilities.getHash(HashUtilities.MD5_ALGORITHM, decompressedBytes);
+		this.fsIndex = new SingleFileSystemIndexHelper(this, fsFSRL, "lzss_decompressed",
+			decompressedBytes.length, md5);
+		this.payloadProvider =
+			new ByteArrayProvider(decompressedBytes, fsIndex.getPayloadFile().getFSRL());
+	}
+
+	@Override
+	public FSRLRoot getFSRL() {
+		return fsFSRL;
+	}
+
+	@Override
+	public String getName() {
+		return fsFSRL.getContainer().getName();
+	}
+
+	@Override
+	public FileSystemRefManager getRefManager() {
+		return fsRefManager;
+	}
+
+	@Override
+	public boolean isClosed() {
+		return payloadProvider == null;
+	}
+
+	@Override
+	public void close() throws IOException {
+		fsRefManager.onClose();
+		if (payloadProvider != null) {
+			payloadProvider.close();
+			payloadProvider = null;
+		}
+		fsIndex.clear();
+	}
+
+	@Override
+	public InputStream getInputStream(GFile file, TaskMonitor monitor)
+			throws IOException, CancelledException {
+		ByteProvider bp = getByteProvider(file, monitor);
+		return bp != null ? bp.getInputStream(0) : null;
+	}
+
+	public ByteProvider getByteProvider(GFile file, TaskMonitor monitor) {
+		return fsIndex.isPayloadFile(file) ? payloadProvider : null;
+	}
+
+	@Override
+	public List<GFile> getListing(GFile directory) throws IOException {
+		return fsIndex.getListing(directory);
+	}
+
+	@Override
+	public GFile lookup(String path) throws IOException {
+		return fsIndex.lookup(path);
 	}
 
 }

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/complzss/CompLzssFileSystemFactory.java

@@ -0,0 +1,50 @@
+/* ###
+ * 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.complzss;
+
+import java.io.File;
+import java.io.IOException;
+
+import ghidra.app.util.bin.ByteProvider;
+import ghidra.file.formats.lzss.LzssCompressionHeader;
+import ghidra.formats.gfilesystem.*;
+import ghidra.formats.gfilesystem.factory.GFileSystemFactoryFull;
+import ghidra.formats.gfilesystem.factory.GFileSystemProbeBytesOnly;
+import ghidra.util.exception.CancelledException;
+import ghidra.util.task.TaskMonitor;
+
+public class CompLzssFileSystemFactory
+		implements GFileSystemFactoryFull<CompLzssFileSystem>, GFileSystemProbeBytesOnly {
+
+	@Override
+	public CompLzssFileSystem create(FSRL containerFSRL, FSRLRoot targetFSRL,
+			ByteProvider byteProvider, File containerFile, FileSystemService fsService,
+			TaskMonitor monitor) throws IOException, CancelledException {
+
+		CompLzssFileSystem fs = new CompLzssFileSystem(targetFSRL, byteProvider, monitor);
+		return fs;
+	}
+
+	@Override
+	public int getBytesRequired() {
+		return LzssCompressionHeader.PROBE_BYTES_NEEDED;
+	}
+
+	@Override
+	public boolean probeStartBytes(FSRL containerFSRL, byte[] startBytes) {
+		return LzssCompressionHeader.probe(startBytes);
+	}
+}

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/cpio/CpioFileSystem.java

@@ -16,86 +16,107 @@
 package ghidra.file.formats.cpio;
 
 import java.io.*;
-import java.util.*;
+import java.util.Date;
+import java.util.List;
 
 import org.apache.commons.compress.archivers.cpio.CpioArchiveEntry;
 import org.apache.commons.compress.archivers.cpio.CpioArchiveInputStream;
 
+import ghidra.app.util.bin.ByteArrayProvider;
 import ghidra.app.util.bin.ByteProvider;
 import ghidra.formats.gfilesystem.*;
+import ghidra.formats.gfilesystem.FSUtilities.StreamCopyResult;
 import ghidra.formats.gfilesystem.annotations.FileSystemInfo;
-import ghidra.formats.gfilesystem.factory.GFileSystemBaseFactory;
+import ghidra.util.NumericUtilities;
 import ghidra.util.exception.CancelledException;
-import ghidra.util.exception.CryptoException;
 import ghidra.util.task.TaskMonitor;
+import utilities.util.FileUtilities;
 
-@FileSystemInfo(type = "cpio", description = "CPIO", factory = GFileSystemBaseFactory.class)
-public class CpioFileSystem extends GFileSystemBase {
+@FileSystemInfo(type = "cpio", description = "CPIO", factory = CpioFileSystemFactory.class)
+public class CpioFileSystem implements GFileSystem {
+	private FSRLRoot fsFSRL;
+	private FileSystemIndexHelper<CpioArchiveEntry> fsIndex;
+	private FileSystemRefManager fsRefManager = new FileSystemRefManager(this);
+	private ByteProvider provider;
 
-	private Map<GFile, CpioArchiveEntry> map = new HashMap<>();
 
-	public CpioFileSystem(String fileSystemName, ByteProvider provider) {
-		super(fileSystemName, provider);
-	}
-
-	@Override
-	public boolean isValid(TaskMonitor monitor) throws IOException {
-		byte[] signature = provider.readBytes(0, 0x10);
-		return CpioArchiveInputStream.matches(signature, 0x10);
-	}
-
-	@Override
-	public void open(TaskMonitor monitor) throws IOException, CryptoException, CancelledException {
+	public CpioFileSystem(FSRLRoot fsFSRL, ByteProvider provider, TaskMonitor monitor)
+			throws IOException {
 		monitor.setMessage("Opening CPIO...");
+		this.fsFSRL = fsFSRL;
+		this.provider = provider;
+		this.fsIndex = new FileSystemIndexHelper<>(this, fsFSRL);
 
 		try (CpioArchiveInputStream cpioInputStream =
 			new CpioArchiveInputStream(provider.getInputStream(0))) {
 			CpioArchiveEntry entry;
+			int fileNum = 0;
 			while ((entry = cpioInputStream.getNextCPIOEntry()) != null) {
-				skipEntryContents(cpioInputStream, monitor);
-				storeEntry(entry, monitor);
+				FileUtilities.copyStreamToStream(cpioInputStream, OutputStream.nullOutputStream(),
+					monitor);
+
+				monitor.setMessage(entry.getName());
+				fsIndex.storeFile(entry.getName(), fileNum++, entry.isDirectory(),
+					entry.getSize(), entry);
 			}
 		}
 		catch (EOFException e) {
 			// silently ignore EOFExceptions
 		}
+		catch (IOException e) {
+			throw e;
+		}
 		catch (Exception e) {
-			FSUtilities.displayException(this, null, "Error While Opening CPIO", e.getMessage(), e);
+			throw new IOException(e);
 		}
 	}
 
 	@Override
 	public void close() throws IOException {
-		super.close();
-		map.clear();
+		fsRefManager.onClose();
+		fsIndex.clear();
+		if (provider != null) {
+			provider.close();
+			provider = null;
+		}
+	}
+
+	@Override
+	public FSRLRoot getFSRL() {
+		return fsFSRL;
+	}
+
+	@Override
+	public String getName() {
+		return fsFSRL.getContainer().getName();
+	}
+
+	@Override
+	public boolean isClosed() {
+		return provider == null;
+	}
+
+	@Override
+	public FileSystemRefManager getRefManager() {
+		return fsRefManager;
 	}
 
 	@Override
 	public List<GFile> getListing(GFile directory) throws IOException {
-		if (directory == null || directory.equals(root)) {
-			List<GFile> roots = new ArrayList<>();
-			for (GFile file : map.keySet()) {
-				if (file.getParentFile() == root || file.getParentFile().equals(root)) {
-					roots.add(file);
-				}
-			}
-			return roots;
-		}
-		List<GFile> tmp = new ArrayList<>();
-		for (GFile file : map.keySet()) {
-			if (file.getParentFile() == null) {
-				continue;
-			}
-			if (file.getParentFile().equals(directory)) {
-				tmp.add(file);
-			}
-		}
-		return tmp;
+		return fsIndex.getListing(directory);
+	}
+
+	@Override
+	public GFile lookup(String path) throws IOException {
+		return fsIndex.lookup(path);
 	}
 
 	@Override
 	public String getInfo(GFile file, TaskMonitor monitor) {
-		CpioArchiveEntry entry = map.get(file);
+		CpioArchiveEntry entry = fsIndex.getMetadata(file);
+		if (entry == null) {
+			return null;
+		}
 		StringBuilder buffer = new StringBuilder();
 		try {
 			buffer.append("Name: " + entry.getName() + "\n");
@@ -129,84 +150,46 @@ public class CpioFileSystem extends GFileSystemBase {
 	}
 
 	@Override
-	protected InputStream getData(GFile file, TaskMonitor monitor)
-			throws IOException, CancelledException, CryptoException {
-		CpioArchiveEntry fileEntry = map.get(file);
-		if (!fileEntry.isRegularFile()) {
+	public InputStream getInputStream(GFile file, TaskMonitor monitor)
+			throws IOException, CancelledException {
+		ByteProvider bp = getByteProvider(file, monitor);
+		return bp != null ? bp.getInputStream(0) : null;
+	}
+
+	public ByteProvider getByteProvider(GFile file, TaskMonitor monitor)
+			throws IOException, CancelledException {
+		CpioArchiveEntry targetEntry = fsIndex.getMetadata(file);
+		if (targetEntry == null) {
+			return null;
+		}
+		if (!targetEntry.isRegularFile()) {
 			throw new IOException("CPIO entry " + file.getName() + " is not a regular file.");
 		}
 		try (CpioArchiveInputStream cpioInputStream =
-			new CpioArchiveInputStream(provider.getInputStream(0));) {
+			new CpioArchiveInputStream(provider.getInputStream(0))) {
 
-			CpioArchiveEntry entry;
-			while ((entry = cpioInputStream.getNextCPIOEntry()) != null) {
-				if (!entry.equals(fileEntry)) {
-					skipEntryContents(cpioInputStream, monitor);
-				}
-				else {
-					byte[] entryBytes = readEntryContents(cpioInputStream, monitor);
-					return new ByteArrayInputStream(entryBytes);
+			CpioArchiveEntry currentEntry;
+			while ((currentEntry = cpioInputStream.getNextCPIOEntry()) != null) {
+				if (currentEntry.equals(targetEntry)) {
+					return getByteProviderForEntry(cpioInputStream, file.getFSRL(), monitor);
 				}
+				FileUtilities.copyStreamToStream(cpioInputStream, OutputStream.nullOutputStream(),
+					monitor);
 			}
 		}
 		catch (IllegalArgumentException e) {
-			//unknown MODES..
+			throw new IOException(e);
 		}
-		return null;
+		throw new IOException("Unable to seek to entry: " + file.getName());
 	}
 
-	private void storeEntry(CpioArchiveEntry entry, TaskMonitor monitor) {
-		monitor.setMessage(entry.getName());
-		GFileImpl file = GFileImpl.fromPathString(this, root, entry.getName(), null,
-			entry.isDirectory(), entry.getSize());
-		storeFile(file, entry, monitor);
-	}
-
-	private void storeFile(GFile file, CpioArchiveEntry entry, TaskMonitor monitor) {
-		if (monitor.isCancelled()) {
-			return;
-		}
-		if (file == null) {
-			return;
-		}
-		if (file.equals(root)) {
-			return;
-		}
-		if (!map.containsKey(file) || map.get(file) == null) {
-			map.put(file, entry);
-		}
-		GFile parentFile = file.getParentFile();
-		storeFile(parentFile, null, monitor);
-	}
-
-	private byte[] readEntryContents(CpioArchiveInputStream cpioInputStream, TaskMonitor monitor)
-			throws IOException, CancelledException {
+	private ByteProvider getByteProviderForEntry(CpioArchiveInputStream cpioInputStream, FSRL fsrl,
+			TaskMonitor monitor) throws CancelledException, IOException {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		byte[] buffer = new byte[64 * 1024];
-		while (true) {
-			if (monitor.isCancelled()) {
-				throw new CancelledException();
-			}
-			int bytesRead = cpioInputStream.read(buffer);
-			if (bytesRead <= 0) {
-				break;
-			}
-			out.write(buffer, 0, bytesRead);
-		}
-		return out.toByteArray();
-	}
-
-	private void skipEntryContents(CpioArchiveInputStream cpioInputStream, TaskMonitor monitor)
-			throws IOException, CancelledException {
-		byte[] buffer = new byte[64 * 1024];
-		while (true) {
-			if (monitor.isCancelled()) {
-				throw new CancelledException();
-			}
-			int bytesRead = cpioInputStream.read(buffer);
-			if (bytesRead <= 0) {
-				break;
-			}
+		StreamCopyResult copyResult = FSUtilities.streamCopy(cpioInputStream, out, monitor);
+		if (fsrl.getMD5() == null) {
+			fsrl = fsrl.withMD5(NumericUtilities.convertBytesToString(copyResult.md5));
 		}
+		return new ByteArrayProvider(out.toByteArray(), fsrl);
 	}
 }

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/cpio/CpioFileSystemFactory.java

@@ -0,0 +1,51 @@
+/* ###
+ * 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.cpio;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.apache.commons.compress.archivers.cpio.CpioArchiveInputStream;
+
+import ghidra.app.util.bin.ByteProvider;
+import ghidra.formats.gfilesystem.*;
+import ghidra.formats.gfilesystem.factory.GFileSystemFactoryFull;
+import ghidra.formats.gfilesystem.factory.GFileSystemProbeBytesOnly;
+import ghidra.util.exception.CancelledException;
+import ghidra.util.task.TaskMonitor;
+
+public class CpioFileSystemFactory
+		implements GFileSystemFactoryFull<CpioFileSystem>, GFileSystemProbeBytesOnly {
+
+	@Override
+	public CpioFileSystem create(FSRL containerFSRL, FSRLRoot targetFSRL,
+			ByteProvider byteProvider, File containerFile, FileSystemService fsService,
+			TaskMonitor monitor) throws IOException, CancelledException {
+
+		CpioFileSystem fs = new CpioFileSystem(targetFSRL, byteProvider, monitor);
+		return fs;
+	}
+
+	@Override
+	public int getBytesRequired() {
+		return 6; // CpioArchiveInputStream doesn't have a value we can use, so we hard code
+	}
+
+	@Override
+	public boolean probeStartBytes(FSRL containerFSRL, byte[] startBytes) {
+		return CpioArchiveInputStream.matches(startBytes, startBytes.length);
+	}
+}

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/gzip/GZipFileSystem.java

@@ -46,7 +46,6 @@ public class GZipFileSystem implements GFileSystem {
 	private final SingleFileSystemIndexHelper fsIndex;
 	private final FileSystemService fsService;
 
-	private GFile payload;
 	private String origFilename;
 	private String payloadKey;
 	private String origComment;
@@ -64,7 +63,6 @@ public class GZipFileSystem implements GFileSystem {
 		FileCacheEntry fce = getPayloadFileCacheEntry(monitor);
 		this.fsIndex =
 			new SingleFileSystemIndexHelper(this, fsFSRL, origFilename, fce.file.length(), fce.md5);
-		this.payload = fsIndex.getPayloadFile();
 	}
 
 	private void readGzipMetadata(File containerFile, TaskMonitor monitor) throws IOException {
@@ -101,7 +99,7 @@ public class GZipFileSystem implements GFileSystem {
 	}
 
 	public GFile getPayloadFile() {
-		return payload;
+		return fsIndex.getPayloadFile();
 	}
 
 	@Override
@@ -118,7 +116,6 @@ public class GZipFileSystem implements GFileSystem {
 	public void close() throws IOException {
 		refManager.onClose();
 		fsIndex.clear();
-		payload = null;
 	}
 
 	@Override
@@ -134,7 +131,7 @@ public class GZipFileSystem implements GFileSystem {
 	@Override
 	public InputStream getInputStream(GFile file, TaskMonitor monitor)
 			throws IOException, CancelledException {
-		if (payload.equals(file)) {
+		if (fsIndex.isPayloadFile(file)) {
 			FileCacheEntry fce = getPayloadFileCacheEntry(monitor);
 			return new FileInputStream(fce.file);
 		}
@@ -148,13 +145,14 @@ public class GZipFileSystem implements GFileSystem {
 
 	@Override
 	public String getInfo(GFile file, TaskMonitor monitor) {
-		if (payload.equals(file)) {
+		if (fsIndex.isPayloadFile(file)) {
 			return FSUtilities.infoMapToString(getInfoMap());
 		}
 		return null;
 	}
 
 	public Map<String, String> getInfoMap() {
+		GFile payload = fsIndex.getPayloadFile();
 		Map<String, String> info = new LinkedHashMap<>();
 		info.put("Name", payload.getName());
 		info.put("Size", Long.toString(payload.getLength()));

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/iso9660/ISO9660Directory.java

@@ -15,14 +15,15 @@
  */
 package ghidra.file.formats.iso9660;
 
-import ghidra.app.util.bin.*;
-import ghidra.program.model.data.*;
-import ghidra.util.exception.DuplicateNameException;
-
-import java.io.*;
+import java.io.IOException;
 import java.time.DateTimeException;
 import java.time.LocalDateTime;
 
+import ghidra.app.util.bin.*;
+import ghidra.formats.gfilesystem.FSRL;
+import ghidra.program.model.data.*;
+import ghidra.util.exception.DuplicateNameException;
+
 public class ISO9660Directory implements StructConverter {
 
 	private int directoryRecordLength;
@@ -175,21 +176,11 @@ public class ISO9660Directory implements StructConverter {
 		return false;
 	}
 
-	/**
-	 * Returns the bytes of the file which this directory points to
-	 * @param provider The ByteProvider
-	 * @param logicalBlockSize
-	 * @return An InputStream of the data bytes
-	 * @throws IOException
-	 */
-	public InputStream getDataBytes(ByteProvider provider, long logicalBlockSize)
-			throws IOException {
+	ByteProvider getByteProvider(ByteProvider provider, long logicalBlockSize, FSRL fsrl) {
 
-		if (!(this.isDirectoryFlagSet())) {
+		if (!this.isDirectoryFlagSet()) {
 			long index = locationOfExtentLE * logicalBlockSize;
-			byte[] dataBytes = provider.readBytes(index, dataLengthLE);
-			InputStream inputStream = new ByteArrayInputStream(dataBytes);
-			return inputStream;
+			return new ByteProviderWrapper(provider, index, dataLengthLE, fsrl);
 		}
 		return null;
 	}

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/iso9660/ISO9660FileSystem.java

@@ -15,10 +15,9 @@
  */
 package ghidra.file.formats.iso9660;
 
-import java.util.*;
-
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.*;
 
 import ghidra.app.util.bin.BinaryReader;
 import ghidra.app.util.bin.ByteProvider;
@@ -148,10 +147,14 @@ public class ISO9660FileSystem extends GFileSystemBase {
 	protected InputStream getData(GFile file, TaskMonitor monitor)
 			throws IOException, CancelledException, CryptoException {
 
-		ISO9660Directory dir = fileToDirectoryMap.get(file);
-		InputStream inputStream = dir.getDataBytes(provider, logicalBlockSize);
+		ByteProvider bp = getByteProvider(file, monitor);
+		return bp != null ? bp.getInputStream(0) : null;
+	}
 
-		return inputStream;
+	public ByteProvider getByteProvider(GFile file, TaskMonitor monitor)
+			throws IOException, CancelledException {
+		ISO9660Directory dir = fileToDirectoryMap.get(file);
+		return dir.getByteProvider(provider, logicalBlockSize, file.getFSRL());
 	}
 
 	/*

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/java/JavaClassDecompilerFileSystem.java

@@ -126,7 +126,7 @@ public class JavaClassDecompilerFileSystem implements GFileSystem {
 	@Override
 	public InputStream getInputStream(GFile file, TaskMonitor monitor)
 			throws IOException, CancelledException {
-		if (fsIndexHelper.getPayloadFile().equals(file)) {
+		if (fsIndexHelper.isPayloadFile(file)) {
 			FileCacheEntry fce = getDecompiledJavaSrcFileEntry(monitor);
 			return new FileInputStream(fce.file);
 		}
@@ -140,7 +140,7 @@ public class JavaClassDecompilerFileSystem implements GFileSystem {
 
 	@Override
 	public String getInfo(GFile file, TaskMonitor monitor) {
-		if (fsIndexHelper.getPayloadFile().equals(file)) {
+		if (fsIndexHelper.isPayloadFile(file)) {
 			Map<String, String> info = new HashMap<>();
 			info.put("Class name", className);
 			return FSUtilities.infoMapToString(info);

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/lzss/LzssCompressionHeader.java

@@ -15,20 +15,46 @@
  */
 package ghidra.file.formats.lzss;
 
+import java.io.IOException;
+
 import ghidra.app.util.bin.*;
 import ghidra.program.model.data.DataType;
 import ghidra.util.exception.DuplicateNameException;
 
-import java.io.IOException;
-
 public class LzssCompressionHeader implements StructConverter {
 
-	private int     signature;
-	private int     compressionType;
-	private int     checksum;
-	private int     decompressedLength;
-	private int     compressedLength;
-	private byte [] padding;
+	public static final int PROBE_BYTES_NEEDED = 8; // sizeof(signature) + sizeof(compressionType)
+
+	/**
+	 * Returns true if the bytes have the magic signature of a LzssCompressionHeader.
+	 * 
+	 * @param startBytes byte array
+	 * @return boolean true if the signature of a LzssCompressionHeader appears at the beginning
+	 * the byte array
+	 */
+	public static boolean probe(byte[] startBytes) {
+		try {
+			if (startBytes.length < PROBE_BYTES_NEEDED) {
+				return false;
+			}
+			BinaryReader reader = new BinaryReader(new ByteArrayProvider(startBytes), false);
+
+			int signature = reader.readNextInt();
+			int compressionType = reader.readNextInt();
+			return signature == LzssConstants.SIGNATURE_LZSS &&
+				compressionType == LzssConstants.SIGNATURE_COMPRESSION;
+		}
+		catch (IOException e) {
+			return false;
+		}
+	}
+
+	private int signature;
+	private int compressionType;
+	private int checksum;
+	private int decompressedLength;
+	private int compressedLength;
+	private byte[] padding;
 
 	public LzssCompressionHeader(ByteProvider provider) throws IOException {
 		BinaryReader reader = new BinaryReader(provider, false);
@@ -60,6 +86,7 @@ public class LzssCompressionHeader implements StructConverter {
 		return padding;
 	}
 
+	@Override
 	public DataType toDataType() throws DuplicateNameException, IOException {
 		return StructConverterUtil.toDataType(this);
 	}

Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/omf/OmfArchiveFileSystem.java

@@ -98,9 +98,15 @@ public class OmfArchiveFileSystem implements GFileSystem {
 	public InputStream getInputStream(GFile file, TaskMonitor monitor)
 			throws IOException, CancelledException {
 
+		ByteProvider bp = getByteProvider(file, monitor);
+		return bp != null ? bp.getInputStream(0) : null;
+	}
+
+	public ByteProvider getByteProvider(GFile file, TaskMonitor monitor) {
 		OmfLibraryRecord.MemberHeader member = fsih.getMetadata(file);
 		return (member != null)
-				? new ByteProviderInputStream(provider, member.payloadOffset, member.size)
+				? new ByteProviderWrapper(provider, member.payloadOffset, member.size,
+					file.getFSRL())
 				: null;
 	}
 

Ghidra/Framework/FileSystem/src/main/java/ghidra/util/HashUtilities.java

@@ -170,6 +170,21 @@ public class HashUtilities {
 		return NumericUtilities.convertBytesToString(messageDigest.digest());
 	}
 
+	/**
+	 * Generate combined message digest hash for the bytes in the specified array.
+	 *  
+	 * @param algorithm message digest algorithm
+	 * @param values array of bytes to hash
+	 * @return message digest hash
+	 * @throws IllegalArgumentException if specified algorithm is not supported
+	 * @see MessageDigest for supported hash algorithms
+	 */
+	public static String getHash(String algorithm, byte[] values) {
+		MessageDigest messageDigest = getMessageDigest(algorithm);
+		messageDigest.update(values);
+		return NumericUtilities.convertBytesToString(messageDigest.digest());
+	}
+
 	private static MessageDigest getMessageDigest(String algorithm) {
 		try {
 			return MessageDigest.getInstance(algorithm);