/* Copyright (C) 1999, 2000  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

package java.util.zip;

/**
 * @author Per Bothner
 * @date January 6, 1999.
 */

/*
 * Written using on-line Java Platform 1.2 API Specification, as well
 * as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).
 * Status:  Believed complete and correct.
 */

public class ZipEntry implements ZipConstants, Cloneable
{
  // These values were determined using a simple test program.
  public static final int STORED = 0;
  public static final int DEFLATED = 8;

  String comment;
  long compressedSize = -1;
  long crc = -1;
  byte[] extra;
  int method = -1;
  String name;
  long size = -1;
  long time = -1;
  long relativeOffset = -1;

  ZipEntry next;

  public ZipEntry (String name)
  {
    if (name.length() > 65535)
      throw new IllegalArgumentException ();
    this.name = name;
  }

  public ZipEntry (ZipEntry ent)
  {
    comment = ent.comment;
    compressedSize = ent.compressedSize;
    crc = ent.crc;
    extra = ent.extra;
    method = ent.method;
    name = ent.name;
    size = ent.size;
    time = ent.time;
    relativeOffset = ent.relativeOffset;
  }
  
  public Object clone ()
  {
    // JCL defines this as being the same as the copy constructor above,
    // except that value of the "extra" field is also copied.
    ZipEntry clone = new ZipEntry (this);
    clone.extra = (byte[]) extra.clone ();
    return clone;
  }

  public String getComment () { return comment; }

  public long getCompressedSize () { return compressedSize; }

  public long getCrc () { return crc; }

  public byte[] getExtra() { return extra; }

  public int getMethod () { return method; }

  public String getName () { return name; }

  public long getSize () { return size; }

  public long getTime () { return time; }

  public boolean isDirectory ()
  {
    if (name != null)
      {
	int nlen = name.length();
	if (nlen > 0 && name.charAt(nlen-1) == '/')
	  return true;
      }
    return false;
  }

  public void setComment (String comment)
  {
    if (comment != null && comment.length() > 65535)
      throw new IllegalArgumentException ();
    this.comment = comment;
  }
  
  public void setCompressedSize (long compressedSize)
  {
    if (size < 0 || size > 0xffffffffL)
      throw new IllegalArgumentException ();
    this.compressedSize = compressedSize;
  }

  public void setCrc (long crc) 
  {
    if (crc < 0 || crc > 0xffffffffL)
      throw new IllegalArgumentException ();
    this.crc = crc;
  }

  public void setExtra (byte[] extra)
  {
    if (extra != null && extra.length > 65535)
      throw new IllegalArgumentException ();
    this.extra = extra;
  }

  public void setMethod (int method)
  {
    if (method != DEFLATED && method != STORED)
      throw new IllegalArgumentException ();
    this.method = method;
  }

  public void setSize (long size)
  {
    if (size < 0 || size > 0xffffffffL)
      throw new IllegalArgumentException ();
    this.size = size;
  }

  public void setTime (long time)
  {
    this.time = time;
  }

  private final static short[] daysToMonthStart = {
    //Jan Feb Mar    Apr      May         Jun         Jul
    0,    31, 31+28, 2*31+28, 2*31+28+30, 3*31+28+30, 3*31+28+2*30,
    // Aug        Sep           Oct           Nov           Dec
    4*31+28+2*30, 5*31+28+2*30, 5*31+28+3*30, 6*31+28+3*30, 6*31+28+4*30};

  /** Convert a DOS-style type value to milliseconds since 1970. */
  static long timeFromDOS (int date, int time)
  {
    int sec = 2 * (time & 0x1f);
    int min = (time >> 5) & 0x3f;
    int hrs = (time >> 11) & 0x1f;
    int day = date & 0x1f;
    int mon = ((date >> 5) & 0xf) - 1;
    int year = ((date >> 9) & 0x7f) + 10;  /* Since 1970. */

    // Guard against invalid or missing date causing IndexOutOfBoundsException.
    if (mon < 0 || mon > 11)
      return -1;

    long mtime = (((hrs * 60) + min) * 60 + sec) * 1000;

    // Leap year calculations are rather trivial in this case ...
    int days = 365 * year + ((year+1)>>2);
    days += daysToMonthStart[mon];
    if ((year & 3) == 0 && mon > 1)
      days++;
    days += day;
    return (days * 24*60*60L + ((hrs * 60) + min) * 60 + sec) * 1000L;
  }

  public String toString () { return name; }
  
  public int hashCode () { return name.hashCode (); }
}
