/* java.util.zip.ZipEntry
   Copyright (C) 2001 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

As a special exception, if you link this library with other files to
produce an executable, this library does not by itself cause the
resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why the
executable file might be covered by the GNU General Public License. */

package java.util.zip;
import java.util.Calendar;
import java.util.TimeZone;
import java.util.Date;

/**
 * This class represents a member of a zip archive.  ZipFile and
 * ZipInputStream will give you instances of this class as information
 * about the members in an archive.  On the other hand ZipOutputStream
 * needs an instance of this class to create a new member.
 *
 * @author Jochen Hoenicke 
 */
public class ZipEntry implements Cloneable
{
  private static int KNOWN_SIZE   = 1;
  private static int KNOWN_CSIZE  = 2;
  private static int KNOWN_CRC    = 4;
  private static int KNOWN_TIME   = 8;

  private static Calendar cal = Calendar.getInstance();

  private String name;
  private int size;
  private int compressedSize;
  private int crc;
  private int time;
  private short known = 0;
  private short method = -1;
  private byte[] extra = null;
  private String comment = null;

  int zipFileIndex = -1;  /* used by ZipFile */
  int flags;              /* used by ZipOutputStream */
  int offset;             /* used by ZipFile and ZipOutputStream */


  /**
   * Compression method.  This method doesn't compress at all.
   */
  public final static int STORED      =  0;
  /**
   * Compression method.  This method uses the Deflater.
   */
  public final static int DEFLATED    =  8;

  /**
   * Creates a zip entry with the given name.
   * @param name the name. May include directory components separated
   * by '/'.
   */
  public ZipEntry(String name)
  {
    if (name == null)
      throw new NullPointerException();
    this.name = name;
  }

  /**
   * Creates a copy of the given zip entry.
   * @param e the entry to copy.
   */
  public ZipEntry(ZipEntry e)
  {
    name = e.name;
    known = e.known;
    size = e.size;
    compressedSize = e.compressedSize;
    crc = e.crc;
    time = e.time;
    method = e.method;
    extra = e.extra;
    comment = e.comment;
  }

  void setDOSTime(int dostime)
  {
    int sec = 2 * (dostime & 0x1f);
    int min = (dostime >> 5) & 0x3f;
    int hrs = (dostime >> 11) & 0x1f;
    int day = (dostime >> 16) & 0x1f;
    int mon = ((dostime >> 21) & 0xf) - 1;
    int year = ((dostime >> 25) & 0x7f) + 1980; /* since 1900 */
    
    // Guard against invalid or missing date causing
    // IndexOutOfBoundsException.
    try
      {
	synchronized (cal)
	  {
	    cal.set(year, mon, day, hrs, min, sec);
	    time = (int) (cal.getTime().getTime() / 1000L);
	  }
	known |= KNOWN_TIME;
      }
    catch (RuntimeException ex)
      {
	/* Ignore illegal time stamp */
	known &= ~KNOWN_TIME;
      }
  }

  int getDOSTime()
  {
    if ((known & KNOWN_TIME) == 0)
      return 0;
    synchronized (cal)
      {
	cal.setTime(new Date(time*1000L));
	return (cal.get(cal.YEAR) - 1980 & 0x7f) << 25
	  | (cal.get(cal.MONTH) + 1) << 21
	  | (cal.get(cal.DAY_OF_MONTH)) << 16
	  | (cal.get(cal.HOUR_OF_DAY)) << 11
	  | (cal.get(cal.MINUTE)) << 5
	  | (cal.get(cal.SECOND)) >> 1;
      }
  }

  /**
   * Creates a copy of this zip entry.
   */
  /**
   * Clones the entry.
   */
  public Object clone()
  {
    try
      {
	return super.clone();
      }
    catch (CloneNotSupportedException ex)
      {
	throw new InternalError();
      }
  }

  /**
   * Returns the entry name.  The path components in the entry are
   * always separated by slashes ('/').  
   */
  public String getName()
  {
    return name;
  }

  /**
   * Sets the time of last modification of the entry.
   * @time the time of last modification of the entry.
   */
  public void setTime(long time)
  {
    this.time = (int) (time / 1000L);
    this.known |= KNOWN_TIME;
  }

  /**
   * Gets the time of last modification of the entry.
   * @return the time of last modification of the entry, or -1 if unknown.
   */
  public long getTime()
  {
    return (known & KNOWN_TIME) != 0 ? time * 1000L : -1;
  }

  /**
   * Sets the size of the uncompressed data.
   * @exception IllegalArgumentException if size is not in 0..0xffffffffL
   */
  public void setSize(long size)
  {
    if ((size & 0xffffffff00000000L) != 0)
	throw new IllegalArgumentException();
    this.size = (int) size;
    this.known |= KNOWN_SIZE;
  }

  /**
   * Gets the size of the uncompressed data.
   * @return the size or -1 if unknown.
   */
  public long getSize()
  {
    return (known & KNOWN_SIZE) != 0 ? size & 0xffffffffL : -1L;
  }

  /**
   * Sets the size of the compressed data.
   * @exception IllegalArgumentException if size is not in 0..0xffffffffL
   */
  public void setCompressedSize(long csize)
  {
    if ((csize & 0xffffffff00000000L) != 0)
	throw new IllegalArgumentException();
    this.compressedSize = (int) csize;
    this.known |= KNOWN_CSIZE;
  }

  /**
   * Gets the size of the compressed data.
   * @return the size or -1 if unknown.
   */
  public long getCompressedSize()
  {
    return (known & KNOWN_CSIZE) != 0 ? compressedSize & 0xffffffffL : -1L;
  }

  /**
   * Sets the crc of the uncompressed data.
   * @exception IllegalArgumentException if crc is not in 0..0xffffffffL
   */
  public void setCrc(long crc)
  {
    if ((crc & 0xffffffff00000000L) != 0)
	throw new IllegalArgumentException();
    this.crc = (int) crc;
    this.known |= KNOWN_CRC;
  }

  /**
   * Gets the crc of the uncompressed data.
   * @return the crc or -1 if unknown.
   */
  public long getCrc()
  {
    return (known & KNOWN_CRC) != 0 ? crc & 0xffffffffL : -1L;
  }

  /**
   * Sets the compression method.  Only DEFLATED and STORED are
   * supported.
   * @exception IllegalArgumentException if method is not supported.
   * @see ZipOutputStream#DEFLATED
   * @see ZipOutputStream#STORED 
   */
  public void setMethod(int method)
  {
    if (method != ZipOutputStream.STORED
	&& method != ZipOutputStream.DEFLATED)
	throw new IllegalArgumentException();
    this.method = (short) method;
  }

  /**
   * Gets the compression method.  
   * @return the compression method or -1 if unknown.
   */
  public int getMethod()
  {
    return method;
  }

  /**
   * Sets the extra data.
   * @exception IllegalArgumentException if extra is longer than 0xffff bytes.
   */
  public void setExtra(byte[] extra)
  {
    if (extra == null) 
      {
	this.extra = null;
	return;
      }

    if (extra.length > 0xffff)
      throw new IllegalArgumentException();
    this.extra = extra;
    try
      {
	int pos = 0;
	while (pos < extra.length) 
	  {
	    int sig = (extra[pos++] & 0xff)
	      | (extra[pos++] & 0xff) << 8;
	    int len = (extra[pos++] & 0xff)
	      | (extra[pos++] & 0xff) << 8;
	    if (sig == 0x5455) 
	      {
		/* extended time stamp */
		int flags = extra[pos];
		if ((flags & 1) != 0)
		  {
		    time = ((extra[pos+1] & 0xff)
			    | (extra[pos+2] & 0xff) << 8
			    | (extra[pos+3] & 0xff) << 16
			    | (extra[pos+4] & 0xff) << 24);
		    known |= KNOWN_TIME;
		  }
	      }
	    pos += len;
	  }
      }
    catch (ArrayIndexOutOfBoundsException ex)
      {
	/* be lenient */
	return;
      }
  }

  /**
   * Gets the extra data.
   * @return the extra data or null if not set.
   */
  public byte[] getExtra()
  {
    return extra;
  }

  /**
   * Sets the entry comment.
   * @exception IllegalArgumentException if comment is longer than 0xffff.
   */
  public void setComment(String comment)
  {
    if (comment.length() > 0xffff)
      throw new IllegalArgumentException();
    this.comment = comment;
  }

  /**
   * Gets the comment.
   * @return the comment or null if not set.
   */
  public String getComment()
  {
    return comment;
  }

  /**
   * Gets true, if the entry is a directory.  This is solely
   * determined by the name, a trailing slash '/' marks a directory.  
   */
  public boolean isDirectory()
  {
    int nlen = name.length();
    return nlen > 0 && name.charAt(nlen - 1) == '/';
  }

  /**
   * Gets the string representation of this ZipEntry.  This is just
   * the name as returned by getName().
   */
  public String toString()
  {
    return name;
  }

  /**
   * Gets the hashCode of this ZipEntry.  This is just the hashCode
   * of the name.  Note that the equals method isn't changed, though.
   */
  public int hashCode()
  {
    return name.hashCode();
  }
}