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Initial version based on previous repository. Project was ported to QT6 and in now cmake based.
author Ideenmodellierer <tiefenrauscher@web.de>
date Thu, 27 Nov 2025 18:40:28 +0100
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1 //////////////////////////////////////////////////////////////////////////////
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2 /// \file Adler16.h
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3 /// \brief Adler checksum, on 2x8 bits.
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4 /// \author JD Gascuel.
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5 /// \copyright (c) 2011-2016 JD Gascuel. All rights reserved.
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6 /// $Id$
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7 //////////////////////////////////////////////////////////////////////////////
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8 //
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9 // BSD 2-Clause License:
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10 //
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11 // Redistribution and use in source and binary forms, with or without
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12 // modification, are permitted provided that the following conditions
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13 // are met:
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14 //
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15 // 1. Redistributions of source code must retain the above copyright notice,
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16 // this list of conditions and the following disclaimer.
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17 //
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18 // 2. Redistributions in binary form must reproduce the above copyright notice,
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19 // this list of conditions and the following disclaimer in the documentation
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20 // and/or other materials provided with the distribution.
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21 //
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22 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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23 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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24 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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25 // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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26 // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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27 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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28 // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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29 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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30 // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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31 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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32 // THE POSSIBILITY OF SUCH DAMAGE.
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33 //
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34 //////////////////////////////////////////////////////////////////////////////
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35 // HISTORY
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36 // 2015-07-31 Creation.
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37 // 2016-05-24 jDG: BSD-2 version.
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38
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39 #ifndef ADLER16_H
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40 #define ADLER16_H
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41
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42 #include <QByteArray>
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43
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44 //////////////////////////////////////////////////////////////////////////////
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45 /// \brief Addler checksum, on 2xN bits.
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46 template <typename T>
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47 class AdlerTemplate
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48 {
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49 T _a, _b;
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50
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51 public:
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52 //------------------------------------------------------------------------
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53 /// \brief Initialize checksum with a given seed.
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54 inline AdlerTemplate(T a, T b)
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55 : _a(a), _b(b)
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56 {}
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57
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58 //------------------------------------------------------------------------
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59 /// \brief Re-initialize checksum with a given seed.
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60 inline void reset(T a, T b)
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61 { _a = a;
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62 _b = b;
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63 }
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64
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65 //------------------------------------------------------------------------
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66 /// \brief Hash a single byte/word
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67 inline void add(int c)
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68 {
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69 _a += (T)(c & 0xFF);
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70 _b += _a;
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71 }
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72
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73 //------------------------------------------------------------------------
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74 /// \brief Hash a block of bytes.
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75 /// \note \a size is always in BYTE units.
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76 inline void add(const void* buffer, size_t size)
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77 {
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78 for(size_t i = 0; i<size; ++i)
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79 add( ((const unsigned char*)buffer)[i] );
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80 }
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81
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82 //------------------------------------------------------------------------
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83 /// \brief Hash all the byte/words for a Qt buffer.
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84 inline void add(const QByteArray& buffer)
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85 {
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86 add(buffer.data(), buffer.size());
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87 }
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88
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89 //------------------------------------------------------------------------
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90 /// \brief Returns hash result.
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91 inline T a() const { return _a; }
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92 inline T b() const { return _b; }
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93
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94 //------------------------------------------------------------------------
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95 /// Check Hash result.
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96 /// \returns TRUE if has do match the given values.
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97 inline bool check(T a, T b)
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98 {
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99 return (_a == a) && (_b == b);
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100 }
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101 };
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102
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103 /// \brief 2x8 bits implementation.
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104 typedef AdlerTemplate<unsigned char> Adler16;
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105
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106 /// \brief 2x16 bits implementation.
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107 typedef AdlerTemplate<unsigned short> Adler32;
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108
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109 #endif // ADDLER16_H
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110