apt-pkg/contrib/hashes.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: hashes.h,v 1.2 2001/03/11 05:30:20 jgg Exp $
   4 /* ######################################################################
   5
   6    Hashes - Simple wrapper around the hash functions
   7
   8    This is just used to make building the methods simpler, this is the
   9    only interface required..
  10
  11    ##################################################################### */
  12                                                                         /*}}}*/
  13 #ifndef APTPKG_HASHES_H
  14 #define APTPKG_HASHES_H
  15
  16
  17 #include <apt-pkg/md5.h>
  18 #include <apt-pkg/sha1.h>
  19 #include <apt-pkg/sha2.h>
  20
  21 #include <cstring>
  22 #include <string>
  23
  24 #ifndef APT_8_CLEANER_HEADERS
  25 using std::min;
  26 using std::vector;
  27 #endif
  28 #ifndef APT_10_CLEANER_HEADERS
  29 #include <apt-pkg/fileutl.h>
  30 #include <algorithm>
  31 #include <vector>
  32 #endif
  33
  34
  35 class FileFd;
  36
  37 // helper class that contains hash function name
  38 // and hash
  39 class HashString
  40 {
  41  protected:
  42    std::string Type;
  43    std::string Hash;
  44    static const char* _SupportedHashes[10];
  45
  46    // internal helper
  47    std::string GetHashForFile(std::string filename) const;
  48
  49  public:
  50    HashString(std::string Type, std::string Hash);
  51    HashString(std::string StringedHashString);  // init from str as "type:hash"
  52    HashString();
  53
  54    // get hash type used
  55    std::string HashType() { return Type; };
  56
  57    // verify the given filename against the currently loaded hash
  58    bool VerifyFile(std::string filename) const;
  59
  60    // generate a hash string from the given filename
  61    bool FromFile(std::string filename);
  62
  63
  64    // helper
  65    std::string toStr() const;                    // convert to str as "type:hash"
  66    bool empty() const;
  67
  68    // return the list of hashes we support
  69    static APT_CONST const char** SupportedHashes();
  70 };
  71
  72 class Hashes
  73 {
  74    public:
  75
  76    MD5Summation MD5;
  77    SHA1Summation SHA1;
  78    SHA256Summation SHA256;
  79    SHA512Summation SHA512;
  80
  81    static const int UntilEOF = 0;
  82
  83    inline bool Add(const unsigned char *Data,unsigned long long Size)
  84    {
  85       return MD5.Add(Data,Size) && SHA1.Add(Data,Size) && SHA256.Add(Data,Size) && SHA512.Add(Data,Size);
  86    };
  87    inline bool Add(const char *Data) {return Add((unsigned char const *)Data,strlen(Data));};
  88    inline bool AddFD(int const Fd,unsigned long long Size = 0)
  89    { return AddFD(Fd, Size, true, true, true, true); };
  90    bool AddFD(int const Fd, unsigned long long Size, bool const addMD5,
  91               bool const addSHA1, bool const addSHA256, bool const addSHA512);
  92    inline bool AddFD(FileFd &Fd,unsigned long long Size = 0)
  93    { return AddFD(Fd, Size, true, true, true, true); };
  94    bool AddFD(FileFd &Fd, unsigned long long Size, bool const addMD5,
  95               bool const addSHA1, bool const addSHA256, bool const addSHA512);
  96    inline bool Add(const unsigned char *Beg,const unsigned char *End)
  97                   {return Add(Beg,End-Beg);};
  98 };
  99
 100 #endif