content: /* ###
   * 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 firmware.option_rom;
  
  import java.io.IOException;
  import java.util.Arrays;
  
  import ghidra.app.util.bin.BinaryReader;
  import ghidra.app.util.bin.ByteProvider;
  import ghidra.formats.gfilesystem.FSRLRoot;
  import ghidra.formats.gfilesystem.FileSystemService;
  import ghidra.formats.gfilesystem.factory.GFileSystemFactoryByteProvider;
  import ghidra.formats.gfilesystem.factory.GFileSystemProbeByteProvider;
  import ghidra.util.task.TaskMonitor;
  
  public class OptionROMFileSystemFactory implements GFileSystemFactoryByteProvider<OptionROMFileSystem>,
  		GFileSystemProbeByteProvider {
  	@Override
  	public boolean probe(ByteProvider provider, FileSystemService fsService, TaskMonitor monitor) throws IOException {
  		byte[] signature = provider.readBytes(0, 2);
  		if (!Arrays.equals(signature, OptionROMConstants.ROM_SIGNATURE_BYTES)) {
  			return false;
  		}
  
  		try {
  			// Ignore option ROMs that contain a single legacy x86 image; those should be loaded
  			// directly by LegacyOptionROMLoader.
  			BinaryReader reader = new BinaryReader(provider, true);
  			LegacyOptionROMHeader header = new LegacyOptionROMHeader(reader);
  			// This is needed to avoid treating nested images (e.g. a legacy image in an open
  			// hybrid expansion ROM filesystem) as an identical ROM filesystem.
  			return header.getPCIRHeader().getImageLength() != provider.length();
  		} catch (IOException ignored) {
  		}
  
  		return true;
  	}
  
  	@Override
  	public OptionROMFileSystem create(FSRLRoot fsrlRoot, ByteProvider provider, FileSystemService fsService,
  			TaskMonitor monitor) throws IOException {
  		OptionROMFileSystem fs = new OptionROMFileSystem(fsrlRoot);
  		try {
  			fs.mount(provider, monitor);
  			return fs;
  		} catch (IOException ioe) {
  			fs.close();
  			throw ioe;
  		}
  	}
  }
  