File indexing completed on 2024-05-12 12:52:49

 /***************************************************************************
  *   Copyright (C) 2013 by Linuxstopmotion contributors;                   *
  *   see the AUTHORS file for details.                                     *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
  *   the Free Software Foundation; either version 2 of the License, or     *
  *   (at your option) any later version.                                   *
  *                                                                         *
  *   This program is distributed in the hope that it will be useful,       *
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  *   GNU General Public License for more details.                          *
  *                                                                         *
  *   You should have received a copy of the GNU General Public License     *
  *   along with this program; if not, write to the                         *
  *   Free Software Foundation, Inc.,                                       *
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
 
 #include "hash.h"
 
 #include <ios>
 
 Hash::Hash() {
     h = 5381;
 }
 
 void Hash::add(uint64_t n) {
     h = h * 33 + n;
 }
 
 void Hash::addS(int64_t n) {
     add(static_cast<uint64_t>(n));
 }
 
 void Hash::add(const char* string) {
     Hash s;
     while (*string) {
         s.add(static_cast<uint64_t>(*string));
         ++string;
     }
     add(s);
 }
 
 void Hash::add(Hash h) {
     add(h.h);
 }
 
 void Hash::add(FILE* fh) {
     Hash s;
     long fpos = ftell(fh);
     fseek(fh, 0, SEEK_SET);
     char buffer[256];
     size_t r = 0;
     while (0 < (r = fread(buffer, 1, sizeof(buffer), fh))) {
         for (size_t i = 0; i != r; ++i)
             s.add(buffer[i]);
     }
     if (r == 0) {
         if (ferror(fh))
             throw std::ios_base::failure("error reading file for hash");
     }
     fseek(fh, fpos, SEEK_SET);
     add(s);
 }
 
 bool Hash::equals(const Hash& other) const {
     return h == other.h;
 }
 
 void Hash::appendTo(std::string& out) {
     out.reserve(out.length() + 16);
     for (int i = 60; i != 0; i -= 4) {
         int digit = (h >> i) & 0xF;
         if (digit < 10)
             out.append(1, '0' + digit);
         else
             out.append(1, 'A' - 10 + digit);
     }
 }
 
 bool operator==(const Hash& a, const Hash& b) {
     return a.equals(b);
 }
 
 bool operator!=(const Hash& a, const Hash& b) {
     return !a.equals(b);
 }
 
 Hash::Hash(const Hash& other) : h(other.h) {
 }
 
 Hash& Hash::operator=(const Hash& other) {
     h = other.h;
     return *this;
 }