apt-pkg/contrib/hashsum.cc

   1 // Cryptographic API Base
   2 #include <config.h>
   3
   4 #include <apt-pkg/fileutl.h>
   5
   6 #include <algorithm>
   7 #include <unistd.h>
   8 #include "hashsum_template.h"
   9
  10 // Summation::AddFD - Add content of file into the checksum             /*{{{*/
  11 // ---------------------------------------------------------------------
  12 /* */
  13 bool SummationImplementation::AddFD(int const Fd, unsigned long long Size) {
  14    unsigned char Buf[64 * 64];
  15    bool const ToEOF = (Size == 0);
  16    while (Size != 0 || ToEOF)
  17    {
  18       unsigned long long n = sizeof(Buf);
  19       if (!ToEOF) n = std::min(Size, n);
  20       ssize_t const Res = read(Fd, Buf, n);
  21       if (Res < 0 || (!ToEOF && Res != (ssize_t) n)) // error, or short read
  22          return false;
  23       if (ToEOF && Res == 0) // EOF
  24          break;
  25       Size -= Res;
  26       Add(Buf,Res);
  27    }
  28    return true;
  29 }
  30 bool SummationImplementation::AddFD(FileFd &Fd, unsigned long long Size) {
  31    unsigned char Buf[64 * 64];
  32    bool const ToEOF = (Size == 0);
  33    while (Size != 0 || ToEOF)
  34    {
  35       unsigned long long n = sizeof(Buf);
  36       if (!ToEOF) n = std::min(Size, n);
  37       unsigned long long a = 0;
  38       if (Fd.Read(Buf, n, &a) == false) // error
  39          return false;
  40       if (ToEOF == false)
  41       {
  42          if (a != n) // short read
  43             return false;
  44       }
  45       else if (a == 0) // EOF
  46          break;
  47       Size -= a;
  48       Add(Buf, a);
  49    }
  50    return true;
  51 }
  52                                                                         /*}}}*/