Method readEntries

src/gnu/zip/ZipFile.java:226–292

Read the central directory of a zip file and fill the entries array. This is called exactly once when first needed. It is called while holding the lock on raf . @exception IOException if a i/o error occured. @exception ZipException if the central directory is malformed

()

   * @exception ZipException if the central directory is malformed 
   */
  private void readEntries() throws ZipException, IOException
  {
    /* Search for the End Of Central Directory.  When a zip comment is 
     * present the directory may start earlier.
     * Note that a comment has a maximum length of 64K, so that is the
     * maximum we search backwards.
     */
    PartialInputStream inp = new PartialInputStream(rrf, 4096);
    long pos = rrf.length() - ENDHDR;
    long top = Math.max(0, pos - 65536);
    do
      {
	if (pos < top)
	  throw new ZipException
	    ("central directory not found, probably not a zip file: " + name);
	inp.seek(pos--);
      }
    while (inp.readLeInt() != ENDSIG);
    
    if (inp.skip(ENDTOT - ENDNRD) != ENDTOT - ENDNRD)
      throw new EOFException(name);
    int count = inp.readLeShort();
    if (inp.skip(ENDOFF - ENDSIZ) != ENDOFF - ENDSIZ)
      throw new EOFException(name);
    int centralOffset = inp.readLeInt();

    entries = new Hashtable(count+count/2);
    inp.seek(centralOffset);
    
    for (int i = 0; i < count; i++)
      {
	if (inp.readLeInt() != CENSIG)
	  throw new ZipException("Wrong Central Directory signature: " + name);

        inp.skip(6);
	int method = inp.readLeShort();
	int dostime = inp.readLeInt();
	int crc = inp.readLeInt();
	int csize = inp.readLeInt();
	int size = inp.readLeInt();
	int nameLen = inp.readLeShort();
	int extraLen = inp.readLeShort();
	int commentLen = inp.readLeShort();
        inp.skip(8);
	int offset = inp.readLeInt();
	String name = inp.readString(nameLen);

	ZipEntry entry = new ZipEntry(name);
	entry.setMethod(method);
	entry.setCrc(crc & 0xffffffffL);
	entry.setSize(size & 0xffffffffL);
	entry.setCompressedSize(csize & 0xffffffffL);
	entry.setDOSTime(dostime);
	if (extraLen > 0)
	  {
	    byte[] extra = new byte[extraLen];
	    inp.readFully(extra);
	    entry.setExtra(extra);