src/java.base/share/classes/jdk/internal/jmod/JmodFile.java

*** 26,49 ****
  package jdk.internal.jmod;
  
  import java.io.BufferedInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.stream.Stream;
  import java.util.zip.ZipEntry;
  import java.util.zip.ZipFile;
  
  /**
   * Helper class to read JMOD file
   */
  public class JmodFile implements AutoCloseable {
      // jmod magic number and version number
!     public static final int JMOD_MAJOR_VERSION = 0x01;
!     public static final int JMOD_MINOR_VERSION = 0x00;
!     public static final byte[] JMOD_MAGIC_NUMBER = {
          0x4A, 0x4D, /* JM */
          JMOD_MAJOR_VERSION, JMOD_MINOR_VERSION, /* version 1.0 */
      };
  
      public static void checkMagic(Path file) throws IOException {
--- 26,51 ----
  package jdk.internal.jmod;
  
  import java.io.BufferedInputStream;
  import java.io.IOException;
  import java.io.InputStream;
+ import java.io.OutputStream;
  import java.nio.file.Files;
  import java.nio.file.Path;
+ import java.util.Iterator;
  import java.util.stream.Stream;
  import java.util.zip.ZipEntry;
  import java.util.zip.ZipFile;
  
  /**
   * Helper class to read JMOD file
   */
  public class JmodFile implements AutoCloseable {
      // jmod magic number and version number
!     private static final int JMOD_MAJOR_VERSION = 0x01;
!     private static final int JMOD_MINOR_VERSION = 0x00;
!     private static final byte[] JMOD_MAGIC_NUMBER = {
          0x4A, 0x4D, /* JM */
          JMOD_MAJOR_VERSION, JMOD_MINOR_VERSION, /* version 1.0 */
      };
  
      public static void checkMagic(Path file) throws IOException {
*** 173,182 ****
--- 175,188 ----
          checkMagic(file);
          this.file = file;
          this.zipfile = new ZipFile(file.toFile());
      }
  
+     public static void writeMagicNumber(OutputStream os) throws IOException {
+         os.write(JMOD_MAGIC_NUMBER);
+     }
+ 
      /**
       * Returns the {@code Entry} for a resource in a JMOD file section
       * or {@code null} if not found.
       */
      public Entry getEntry(Section section, String name) {