apt-pkg/contrib/hashsum.cc

   1 // Cryptographic API Base
   2 #include <config.h>
   3
   4 #include <unistd.h>
   5 #include "hashsum_template.h"
   6
   7 // Summation::AddFD - Add content of file into the checksum             /*{{{*/
   8 // ---------------------------------------------------------------------
   9 /* */
  10 bool SummationImplementation::AddFD(int const Fd, unsigned long long Size) {
  11    unsigned char Buf[64 * 64];
  12    bool const ToEOF = (Size == 0);
  13    while (Size != 0 || ToEOF)
  14    {
  15       unsigned long long n = sizeof(Buf);
  16       if (!ToEOF) n = std::min(Size, n);
  17       ssize_t const Res = read(Fd, Buf, n);
  18       if (Res < 0 || (!ToEOF && Res != (ssize_t) n)) // error, or short read
  19          return false;
  20       if (ToEOF && Res == 0) // EOF
  21          break;
  22       Size -= Res;
  23       Add(Buf,Res);
  24    }
  25    return true;
  26 }
  27 bool SummationImplementation::AddFD(FileFd &Fd, unsigned long long Size) {
  28    unsigned char Buf[64 * 64];
  29    bool const ToEOF = (Size == 0);
  30    while (Size != 0 || ToEOF)
  31    {
  32       unsigned long long n = sizeof(Buf);
  33       if (!ToEOF) n = std::min(Size, n);
  34       unsigned long long a = 0;
  35       if (Fd.Read(Buf, n, &a) == false) // error
  36          return false;
  37       if (ToEOF == false)
  38       {
  39          if (a != n) // short read
  40             return false;
  41       }
  42       else if (a == 0) // EOF
  43          break;
  44       Size -= a;
  45       Add(Buf, a);
  46    }
  47    return true;
  48 }
  49                                                                         /*}}}*/