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  1. // IChecksum.cs - Interface to compute a data checksum
  2. // Copyright (C) 2001 Mike Krueger
  3. //
  4. // This file was translated from java, it was part of the GNU Classpath
  5. // Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
  6. //
  7. // This program is free software; you can redistribute it and/or
  8. // modify it under the terms of the GNU General Public License
  9. // as published by the Free Software Foundation; either version 2
  10. // of the License, or (at your option) any later version.
  11. //
  12. // This program is distributed in the hope that it will be useful,
  13. // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15. // GNU General Public License for more details.
  16. //
  17. // You should have received a copy of the GNU General Public License
  18. // along with this program; if not, write to the Free Software
  19. // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20. //
  21. // Linking this library statically or dynamically with other modules is
  22. // making a combined work based on this library.  Thus, the terms and
  23. // conditions of the GNU General Public License cover the whole
  24. // combination.
  25. //
  26. // As a special exception, the copyright holders of this library give you
  27. // permission to link this library with independent modules to produce an
  28. // executable, regardless of the license terms of these independent
  29. // modules, and to copy and distribute the resulting executable under
  30. // terms of your choice, provided that you also meet, for each linked
  31. // independent module, the terms and conditions of the license of that
  32. // module.  An independent module is a module which is not derived from
  33. // or based on this library.  If you modify this library, you may extend
  34. // this exception to your version of the library, but you are not
  35. // obligated to do so.  If you do not wish to do so, delete this
  36. // exception statement from your version.
  37.  
  38. namespace PdfSharp.SharpZipLib.Checksums
  39. {
  40.        
  41.         /// <summary>
  42.         /// Interface to compute a data checksum used by checked input/output streams.
  43.         /// A data checksum can be updated by one byte or with a byte array. After each
  44.         /// update the value of the current checksum can be returned by calling
  45.         /// <code>getValue</code>. The complete checksum object can also be reset
  46.         /// so it can be used again with new data.
  47.         /// </summary>
  48.         internal interface IChecksum
  49.         {
  50.                 /// <summary>
  51.                 /// Returns the data checksum computed so far.
  52.                 /// </summary>
  53.                 long Value
  54.                 {
  55.                         get;
  56.                 }
  57.                
  58.                 /// <summary>
  59.                 /// Resets the data checksum as if no update was ever called.
  60.                 /// </summary>
  61.                 void Reset();
  62.                
  63.                 /// <summary>
  64.                 /// Adds one byte to the data checksum.
  65.                 /// </summary>
  66.                 /// <param name = "bval">
  67.                 /// the data value to add. The high byte of the int is ignored.
  68.                 /// </param>
  69.                 void Update(int bval);
  70.                
  71.                 /// <summary>
  72.                 /// Updates the data checksum with the bytes taken from the array.
  73.                 /// </summary>
  74.                 /// <param name="buffer">
  75.                 /// buffer an array of bytes
  76.                 /// </param>
  77.                 void Update(byte[] buffer);
  78.                
  79.                 /// <summary>
  80.                 /// Adds the byte array to the data checksum.
  81.                 /// </summary>
  82.                 /// <param name = "buf">
  83.                 /// the buffer which contains the data
  84.                 /// </param>
  85.                 /// <param name = "off">
  86.                 /// the offset in the buffer where the data starts
  87.                 /// </param>
  88.                 /// <param name = "len">
  89.                 /// the length of the data
  90.                 /// </param>
  91.                 void Update(byte[] buf, int off, int len);
  92.         }
  93. }
  94.  
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