src/GapList.h

   1 //
   2 // This file is part of the aMule Project.
   3 //
   4 // Copyright (c) 2008-2011 aMule Team ( admin@amule.org / http://www.amule.org )
   5 //
   6 // Any parts of this program derived from the xMule, lMule or eMule project,
   7 // or contributed by third-party developers are copyrighted by their
   8 // respective authors.
   9 //
  10 // This program is free software; you can redistribute it and/or modify
  11 // it under the terms of the GNU General Public License as published by
  12 // the Free Software Foundation; either version 2 of the License, or
  13 // (at your option) any later version.
  14 //
  15 // This program is distributed in the hope that it will be useful,
  16 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 // GNU General Public License for more details.
  19 //
  20 // You should have received a copy of the GNU General Public License
  21 // along with this program; if not, write to the Free Software
  22 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
  23 //
  24
  25 #ifndef GAPLIST_H
  26 #define GAPLIST_H
  27
  28 #include <map>
  29
  30 class CGapList {
  31 private:
  32         // The internal gap list:
  33         // Each gap is stored as a map entry.
  34         // The first (key) is the end, the second (value) the start.
  35         typedef std::map<uint64,uint64> ListType;
  36         typedef ListType::iterator iterator;
  37         ListType m_gaplist;
  38         // size of the part file the list belongs to
  39         uint64 m_filesize;
  40         // number of parts
  41         uint16 m_iPartCount;
  42         // size of the last part
  43         uint32 m_sizeLastPart;
  44         // total gapsize
  45         uint64 m_totalGapSize;
  46         // flag if it's valid
  47         bool m_totalGapSizeValid;
  48
  49         // cache completeness of parts
  50         enum ePartComplete {
  51                 complete,
  52                 incomplete,
  53                 unknown
  54         };
  55         std::vector<byte> m_partsComplete;
  56
  57         // get size of any part
  58         uint32 GetPartSize(uint16 part) const { return part == m_iPartCount - 1 ? m_sizeLastPart : PARTSIZE; }
  59         // check arguments, clip end, false: error
  60         inline bool ArgCheck(uint64 gapstart, uint64 &gapend) const;
  61 public:
  62         // construct
  63         CGapList() { Init(0, false); } // NO MORE uninitialized variables >:(
  64         // setup (and eventually clear) list, optionally as empty (one large gap)
  65         void Init(uint64 fileSize, bool empty);
  66         // add a gap for a range
  67         void AddGap(uint64 gapstart, uint64 gapend);
  68         // add a gap for a part
  69         void AddGap(uint16 part);
  70         // fill a gap for a range
  71         void FillGap(uint64 gapstart, uint64 gapend);
  72         // fill a gap for a part
  73         void FillGap(uint16 part);
  74         // Is this range complete ?
  75         bool IsComplete(uint64 gapstart, uint64 gapend) const;
  76         // Is this part complete ?
  77         bool IsComplete(uint16 part);
  78         // Is the whole file complete ?
  79         bool IsComplete() const { return m_gaplist.empty(); }
  80         // number of gaps
  81         uint32 size() const { return m_gaplist.size(); }
  82         // no gaps ?
  83         bool empty() const { return m_gaplist.empty(); }
  84         // size of all gaps
  85         uint64 GetGapSize();
  86         // size of gaps inside one part
  87         uint32 GetGapSize(uint16 part) const;
  88
  89         // Iterator class to loop through the gaps read-only
  90         // Gaps are returned just as start/end value
  91         class const_iterator {
  92                 // iterator for internal list
  93                 ListType::const_iterator m_it;
  94         public:
  95                 // constructs
  96                 const_iterator() {};
  97                 const_iterator(const ListType::const_iterator& it) { m_it = it; };
  98                 // operators
  99                 bool operator != (const const_iterator& it) const { return m_it != it.m_it; }
 100                 const_iterator& operator ++ () { ++ m_it; return *this; }
 101                 // get start of gap pointed to
 102                 uint64 start() const { return (* m_it).second; }
 103                 // get end of gap pointed to
 104                 uint64 end() const { return (* m_it).first; }
 105         };
 106         // begin/end iterators for looping
 107         const_iterator begin() const { return const_iterator(m_gaplist.begin()); }
 108         const_iterator end() const { return const_iterator(m_gaplist.end()); }
 109
 110 };
 111
 112 #endif // GAPLIST_H
 113 // File_checked_for_headers