text: /*
   *      Copyright (C) 2005-2013 Team XBMC
   *      http://xbmc.org
   *
   *  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, 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 XBMC; see the file COPYING.  If not, see
   *  <http://www.gnu.org/licenses/>.
   *
   */
  
  #include <stdio.h>
  #include <string.h>
  #include <stdlib.h>
  #include <ctype.h>
  
  #include "AddonVersion.h"
  #include "utils/StringUtils.h"
  
  namespace ADDON
  {
    AddonVersion::AddonVersion(const std::string& version)
    : mEpoch(0), mUpstream(version.empty() ? "0.0.0" : version)
    {
      size_t pos = mUpstream.find(':');
      if (pos != std::string::npos)
      {
        mEpoch = strtol(mUpstream.c_str(), NULL, 10);
        mUpstream.erase(0, pos+1);
      }
  
      pos = mUpstream.find('-');
      if (pos != std::string::npos)
      {
        mRevision = mUpstream.substr(pos+1);
        mUpstream.erase(pos);
      }
    }
  
    /**Compare two components of a Debian-style version.  Return -1, 0, or 1
     * if a is less than, equal to, or greater than b, respectively.
     */
    int AddonVersion::CompareComponent(const char *a, const char *b)
    {
      while (*a && *b)
      {
        while (*a && *b && !isdigit(*a) && !isdigit(*b))
        {
          if (*a != *b)
          {
            if (*a == '~') return -1;
            if (*b == '~') return 1;
            return *a < *b ? -1 : 1;
          }
          a++;
          b++;
        }
        if (*a && *b && (!isdigit(*a) || !isdigit(*b)))
        {
          if (*a == '~') return -1;
          if (*b == '~') return 1;
          return isdigit(*a) ? -1 : 1;
        }
  
        char *next_a, *next_b;
        long int num_a = strtol(a, &next_a, 10);
        long int num_b = strtol(b, &next_b, 10);
        if (num_a != num_b)
          return num_a < num_b ? -1 : 1;
  
        a = next_a;
        b = next_b;
      }
      if (!*a && !*b)
        return 0;
      if (*a)
        return *a == '~' ? -1 : 1;
      else
        return *b == '~' ? 1 : -1;
    }
  
    bool AddonVersion::operator<(const AddonVersion& other) const
    {
      if (mEpoch != other.mEpoch)
        return mEpoch < other.mEpoch;
  
      int result = CompareComponent(mUpstream.c_str(), other.mUpstream.c_str());
      if (result)
        return (result < 0);
  
      return (CompareComponent(mRevision.c_str(), other.mRevision.c_str()) < 0);
    }
  
    bool AddonVersion::operator>(const AddonVersion & other) const
    {
      return !(*this <= other);
    }
  
    bool AddonVersion::operator==(const AddonVersion& other) const
    {
      return mEpoch == other.mEpoch
        && CompareComponent(mUpstream.c_str(), other.mUpstream.c_str()) == 0
        && CompareComponent(mRevision.c_str(), other.mRevision.c_str()) == 0;
    }
  
    bool AddonVersion::operator!=(const AddonVersion & other) const
    {
      return !(*this == other);
    }
  
    bool AddonVersion::operator<=(const AddonVersion& other) const
    {
      return *this < other || *this == other;
    }
  
    bool AddonVersion::operator>=(const AddonVersion & other) const
    {
      return !(*this < other);
    }
  
    bool AddonVersion::empty() const
    {
      return mEpoch == 0 && mUpstream == "0.0.0" && mRevision.empty();
    }
  
    std::string AddonVersion::asString() const
    {
      std::string out;
      if (mEpoch)
        out = StringUtils::Format("%i:", mEpoch);
      out += mUpstream;
      if (!mRevision.empty())
        out += "-" + mRevision;
      return out;
    }
  
    bool AddonVersion::SplitFileName(std::string& ID, std::string& version,
                                     const std::string& filename)
    {
      size_t dpos = filename.rfind("-");
      if (dpos == std::string::npos)
        return false;
      ID = filename.substr(0, dpos);
      version = filename.substr(dpos + 1);
      version = version.substr(0, version.size() - 4);
  
      return true;
    }
  }
  