adding zipentry and zipoutputstream classes

classpath/java/util/zip/ZipEntry.java

@@ -1,21 +1,160 @@
-/* Copyright (c) 2008-2013, Avian Contributors
-
-   Permission to use, copy, modify, and/or distribute this software
-   for any purpose with or without fee is hereby granted, provided
-   that the above copyright notice and this permission notice appear
-   in all copies.
-
-   There is NO WARRANTY for this software.  See license.txt for
-   details. */
-
 package java.util.zip;
 
-public abstract class ZipEntry {
-  public abstract String getName();
-  public abstract int getCompressedSize();
-  public abstract int getSize();
+import java.util.Calendar;
+import java.util.Date;
 
+/**
+ * class ZipEntry:
+ *
+ * Class to store and retrieve information for entries in a zip file
+ * Contains variables for all standard zip format field as well as
+ * setter and accessor methods
+ *
+ * @author ReadyTalk Summer 2013 Intern Team
+ **/
+public class ZipEntry {
+  String name;
+  //Minimum version needed to extract the file(s) from a compressed state
+  short reqVersion;
+  
+  //Method used to compress file
+  short compressionMethod;
+  
+  //Format of date and time are both 2 byte fields
+  short modTime;
+  short modDate;
+  
+  //CRC-32
+  int crc;
+  
+  //Sizes of file
+  int compSize;
+  int uncompSize;
+
+  int offset;
+  
+  public ZipEntry(String name) {
+    this.name = name;
+    setTimeDate();
+    compSize = 0;
+    uncompSize = 0;
+    crc = 0;
+    offset = 0;
+  }
+
+  //Method to return name of the file
+  public String getName() {
+    return name;
+  }
+  
+  //Method to check if file is a directory
   public boolean isDirectory() {
     return getName().endsWith("/");
   }
-}
+
+  //Method to return the compressed size of the file
+  public int getCompressedSize() {
+    return compSize;
+  }
+
+  //Method to return the uncompressed size of the file
+  public int getSize() {
+    return uncompSize;
+  }
+  
+  /**
+   * Method setTime Date():
+   * Creates a calendar object to retrieve date and time information
+   * 
+   * Time is stored in the MSDOS format 5 bits for hour, 6 bits for min, 5 bits for seconds
+   * Hours are in military time and must be adjusted to time zone
+   * Seconds are divided by two before storing and must be multiplied by two to retrieve
+   *
+   * Date is stored in the MSDOS format 7 bit for year, 4 bit for month, 5 bits for day of month
+   * Year is the number of years since 1980 per, the month is stored starting at 0
+   * for January. Day of month is stored with nature numbering
+   * 
+   * Bit masks and shifting are used to build the time and date bytes
+   * 
+   * @author cjordan
+   **/
+  public void setTimeDate(){
+	  final int DAY_OF_MONTH = 5;
+	  final int HOUR_OF_DAY = 11;
+	  final int MINUTE = 12;
+	  final int MONTH = 2;
+	  final int SECOND = 13;
+	  final int YEAR = 1;
+
+	  Calendar modCalendar = Calendar.getInstance();
+
+	  //Hour
+	  int timeBits = modCalendar.get(HOUR_OF_DAY);
+      timeBits = timeBits - 6;
+	  timeBits = timeBits << 6;
+	  
+	  //Minutes
+	  int minBits = 0x3f & (modCalendar.get(MINUTE));;
+	  timeBits = timeBits ^ minBits;
+	  timeBits = timeBits << 5;
+	  
+	  //Seconds
+	  int secBits = 0x1f & (modCalendar.get(SECOND));
+	  secBits = secBits >> 1;
+	  timeBits = timeBits ^ secBits;
+	  
+	  //Store Time
+	  modTime = (short)timeBits;
+	  
+	  //Year
+	  int dateBits = (modCalendar.get(YEAR) -1980);
+	  dateBits = dateBits << 4;
+
+	  //Month
+      int month = 0xf & ((modCalendar.get(MONTH)) + 1);
+	  dateBits = dateBits ^ month;
+	  dateBits = dateBits << 5;
+	  
+	  //Day of month
+	  int dayBits = 0x1f & modCalendar.get(DAY_OF_MONTH);
+	  dateBits = dateBits ^ dayBits;
+	  
+	  //Store Date
+	  modDate = (short)dateBits;  
+    
+  }
+  
+  //Method to set the minimum version required to open the zip file
+  //Valid values for the compression method are the numbers 1.0 to 10.0
+  public boolean setRequiredVersion(float versionFloat){
+	  //Check for valid version numbers
+	  if (versionFloat < 1 || versionFloat > 100){
+		  return false;
+	  }
+	  
+	  //Convert to short value for storage
+	  versionFloat = versionFloat * 10;
+	  short versionShort = (short)versionFloat;
+	  
+	  //Set value of version
+	  reqVersion = versionShort;
+	  return true;
+  }
+  
+  //Method to set the compression method for the file
+  //Valid values for the compression method are the numbers 0 to 19 and 99
+  public boolean setCompressionMethod(short compMethod){
+	  if (compMethod == 99){
+		  compressionMethod = compMethod;
+		  return true;
+	  }
+	  else if (compMethod < 0 || compMethod > 19){
+		  return false;
+	  }
+	  else{
+		  compressionMethod = compMethod;
+		  return true;
+	  }
+  }
+  
+}