apt-pkg/contrib/hashsum_template.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: hashsum_template.h,v 1.3 2001/05/07 05:05:47 jgg Exp $
   4 /* ######################################################################
   5
   6    HashSumValueTemplate - Generic Storage for a hash value
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 #ifndef APTPKG_HASHSUM_TEMPLATE_H
  11 #define APTPKG_HASHSUM_TEMPLATE_H
  12
  13
  14 #include <string>
  15 #include <cstring>
  16 #ifdef APT_PKG_EXPOSE_STRING_VIEW
  17 #include <apt-pkg/string_view.h>
  18 #endif
  19
  20 #include <apt-pkg/strutl.h>
  21
  22 #ifndef APT_10_CLEANER_HEADERS
  23 #include <apt-pkg/fileutl.h>
  24 #include <algorithm>
  25 #include <stdint.h>
  26 #endif
  27 #ifndef APT_8_CLEANER_HEADERS
  28 using std::string;
  29 using std::min;
  30 #endif
  31
  32 class FileFd;
  33
  34 template<int N>
  35 class HashSumValue
  36 {
  37    unsigned char Sum[N/8];
  38
  39    public:
  40
  41    // Accessors
  42    bool operator ==(const HashSumValue &rhs) const
  43    {
  44       return memcmp(Sum,rhs.Sum,sizeof(Sum)) == 0;
  45    }
  46    bool operator !=(const HashSumValue &rhs) const
  47    {
  48       return memcmp(Sum,rhs.Sum,sizeof(Sum)) != 0;
  49    }
  50
  51    std::string Value() const
  52    {
  53       char Conv[16] =
  54       { '0','1','2','3','4','5','6','7','8','9','a','b',
  55         'c','d','e','f'
  56       };
  57       char Result[((N/8)*2)+1];
  58       Result[(N/8)*2] = 0;
  59
  60       // Convert each char into two letters
  61       int J = 0;
  62       int I = 0;
  63       for (; I != (N/8)*2; J++,I += 2)
  64       {
  65          Result[I] = Conv[Sum[J] >> 4];
  66          Result[I + 1] = Conv[Sum[J] & 0xF];
  67       }
  68       return std::string(Result);
  69    }
  70
  71    inline void Value(unsigned char S[N/8])
  72    {
  73       for (int I = 0; I != sizeof(Sum); ++I)
  74          S[I] = Sum[I];
  75    }
  76
  77    inline operator std::string() const
  78    {
  79       return Value();
  80    }
  81
  82 #ifdef APT_PKG_EXPOSE_STRING_VIEW
  83    APT_HIDDEN bool Set(APT::StringView Str)
  84    {
  85       return Hex2Num(Str,Sum,sizeof(Sum));
  86    }
  87 #else
  88    bool Set(std::string Str)
  89    {
  90       return Hex2Num(Str,Sum,sizeof(Sum));
  91    }
  92 #endif
  93    inline void Set(unsigned char S[N/8])
  94    {
  95       for (int I = 0; I != sizeof(Sum); ++I)
  96          Sum[I] = S[I];
  97    }
  98
  99    explicit HashSumValue(std::string const &Str)
 100    {
 101          memset(Sum,0,sizeof(Sum));
 102          Set(Str);
 103    }
 104 #ifdef APT_PKG_EXPOSE_STRING_VIEW
 105    APT_HIDDEN explicit HashSumValue(APT::StringView const &Str)
 106    {
 107          memset(Sum,0,sizeof(Sum));
 108          Set(Str);
 109    }
 110    APT_HIDDEN explicit HashSumValue(const char *Str)
 111    {
 112          memset(Sum,0,sizeof(Sum));
 113          Set(Str);
 114    }
 115 #endif
 116    HashSumValue()
 117    {
 118       memset(Sum,0,sizeof(Sum));
 119    }
 120 };
 121
 122 class SummationImplementation
 123 {
 124    public:
 125    virtual bool Add(const unsigned char *inbuf, unsigned long long inlen) = 0;
 126    inline bool Add(const char *inbuf, unsigned long long const inlen)
 127    { return Add((const unsigned char *)inbuf, inlen); }
 128
 129    inline bool Add(const unsigned char *Data)
 130    { return Add(Data, strlen((const char *)Data)); }
 131    inline bool Add(const char *Data)
 132    { return Add((const unsigned char *)Data, strlen(Data)); }
 133
 134    inline bool Add(const unsigned char *Beg, const unsigned char *End)
 135    { return Add(Beg, End - Beg); }
 136    inline bool Add(const char *Beg, const char *End)
 137    { return Add((const unsigned char *)Beg, End - Beg); }
 138
 139    bool AddFD(int Fd, unsigned long long Size = 0);
 140    bool AddFD(FileFd &Fd, unsigned long long Size = 0);
 141 };
 142
 143 #endif