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annotate Checksums/IChecksum.cs @ 1:94e25b786321

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Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller Initial commit of clean SharpZipLib 0860 source. Only change is build paths.
author IBBoard <dev@ibboard.co.uk>
date Sat, 30 Oct 2010 14:03:17 +0000
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1 // IChecksum.cs - Interface to compute a data checksum
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2 // Copyright (C) 2001 Mike Krueger
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3 //
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4 // This file was translated from java, it was part of the GNU Classpath
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5 // Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
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6 //
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7 // This program is free software; you can redistribute it and/or
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8 // modify it under the terms of the GNU General Public License
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9 // as published by the Free Software Foundation; either version 2
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10 // of the License, or (at your option) any later version.
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11 //
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12 // This program is distributed in the hope that it will be useful,
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13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 // GNU General Public License for more details.
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16 //
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17 // You should have received a copy of the GNU General Public License
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18 // along with this program; if not, write to the Free Software
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19 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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20 //
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21 // Linking this library statically or dynamically with other modules is
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22 // making a combined work based on this library. Thus, the terms and
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23 // conditions of the GNU General Public License cover the whole
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24 // combination.
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25 //
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26 // As a special exception, the copyright holders of this library give you
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27 // permission to link this library with independent modules to produce an
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28 // executable, regardless of the license terms of these independent
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29 // modules, and to copy and distribute the resulting executable under
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30 // terms of your choice, provided that you also meet, for each linked
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31 // independent module, the terms and conditions of the license of that
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32 // module. An independent module is a module which is not derived from
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33 // or based on this library. If you modify this library, you may extend
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34 // this exception to your version of the library, but you are not
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35 // obligated to do so. If you do not wish to do so, delete this
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36 // exception statement from your version.
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37
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38 namespace ICSharpCode.SharpZipLib.Checksums
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39 {
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40
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41 /// <summary>
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42 /// Interface to compute a data checksum used by checked input/output streams.
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43 /// A data checksum can be updated by one byte or with a byte array. After each
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44 /// update the value of the current checksum can be returned by calling
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45 /// <code>getValue</code>. The complete checksum object can also be reset
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46 /// so it can be used again with new data.
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47 /// </summary>
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48 public interface IChecksum
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49 {
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50 /// <summary>
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51 /// Returns the data checksum computed so far.
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52 /// </summary>
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53 long Value
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54 {
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55 get;
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56 }
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57
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58 /// <summary>
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59 /// Resets the data checksum as if no update was ever called.
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60 /// </summary>
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61 void Reset();
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62
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63 /// <summary>
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64 /// Adds one byte to the data checksum.
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65 /// </summary>
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66 /// <param name = "value">
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67 /// the data value to add. The high byte of the int is ignored.
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68 /// </param>
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69 void Update(int value);
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70
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71 /// <summary>
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72 /// Updates the data checksum with the bytes taken from the array.
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73 /// </summary>
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74 /// <param name="buffer">
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75 /// buffer an array of bytes
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76 /// </param>
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77 void Update(byte[] buffer);
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78
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79 /// <summary>
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80 /// Adds the byte array to the data checksum.
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81 /// </summary>
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82 /// <param name = "buffer">
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83 /// The buffer which contains the data
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84 /// </param>
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85 /// <param name = "offset">
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86 /// The offset in the buffer where the data starts
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87 /// </param>
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88 /// <param name = "count">
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89 /// the number of data bytes to add.
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90 /// </param>
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91 void Update(byte[] buffer, int offset, int count);
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92 }
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93 }