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.List;
  
  import ghidra.app.util.bin.*;
  import ghidra.formats.gfilesystem.*;
  import ghidra.formats.gfilesystem.annotations.FileSystemInfo;
  import ghidra.formats.gfilesystem.fileinfo.FileAttributes;
  import ghidra.util.task.TaskMonitor;
  
  @FileSystemInfo(type = "pcir", description = "PCI Option ROM", factory = OptionROMFileSystemFactory.class)
  public class OptionROMFileSystem implements GFileSystem {
  	private final FSRLRoot fsFSRL;
  	private final FileSystemIndexHelper<OptionROMHeader> fsih;
  	private final FileSystemRefManager refManager = new FileSystemRefManager(this);
  	private ByteProvider provider;
  
  	public OptionROMFileSystem(FSRLRoot fsFSRL) {
  		this.fsFSRL = fsFSRL;
  		this.fsih = new FileSystemIndexHelper<>(this, fsFSRL);
  	}
  
  	public void mount(ByteProvider provider, TaskMonitor monitor) throws IOException {
  		this.provider = provider;
  		int imageOffset = 0;
  		while (true) {
  			// Read each subsequent image and add it to the map (until the last image is read).
  			ByteProviderWrapper imageProvider =
  					new ByteProviderWrapper(provider, imageOffset, provider.length() - imageOffset);
  			BinaryReader reader = new BinaryReader(imageProvider, true);
  			OptionROMHeader header = OptionROMHeaderFactory.parseOptionROM(reader);
  			PCIDataStructureHeader pcirHeader = header.getPCIRHeader();
  			imageOffset += pcirHeader.getImageLength();
  
  			String filename = String.format("Image %d: %s", fsih.getFileCount() + 1,
  				OptionROMConstants.CodeType.toString(pcirHeader.getCodeType()));
  			fsih.storeFileWithParent(filename, null, -1, false, pcirHeader.getImageLength(),
  				header);
  			if (pcirHeader.isLastImage()) {
  				break;
  			}
  		}
  	}
  
  	@Override
  	public GFile lookup(String path) {
  		return fsih.lookup(path);
  	}
  
  	@Override
  	public void close() throws IOException {
  		refManager.onClose();
  		if (provider != null) {
  			provider.close();
  			provider = null;
  		}
  
  		fsih.clear();
  	}
  
  	@Override
  	public boolean isClosed() {
  		return provider == null;
  	}
  
  	@Override
  	public ByteProvider getByteProvider(GFile file, TaskMonitor monitor) throws IOException {
  		OptionROMHeader entry = fsih.getMetadata(file);
  		return new ByteProviderWrapper(entry.getByteProvider(), file.getFSRL());
  	}
  
  	@Override
  	public FileAttributes getFileAttributes(GFile file, TaskMonitor monitor) {
  		OptionROMHeader entry = fsih.getMetadata(file);
  		return entry.getFileAttributes();
  	}
  
  	@Override
  	public FSRLRoot getFSRL() {
  		return fsFSRL;
  	}
  
  	@Override
  	public List<GFile> getListing(GFile directory) {
  		return fsih.getListing(directory);
  	}
  
  	@Override
  	public String getName() {
  		return fsFSRL.getContainer().getName();
  	}
  
  	@Override
  	public FileSystemRefManager getRefManager() {
  		return refManager;
  	}
  }
  