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[amule.git] / src / GapList.cpp

//
// This file is part of the aMule Project.
//
// Copyright (c) 2008-2009 aMule Team ( admin@amule.org / http://www.amule.org )
//
// Any parts of this program derived from the xMule, lMule or eMule project,
// or contributed by third-party developers are copyrighted by their
// respective authors.
//
// 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
//


#include "Types.h"
#include <protocol/ed2k/Constants.h>    // for PARTSIZE
#include "GapList.h"

#include "Logger.h"
#include <common/Format.h>

void CGapList::Init(uint64 fileSize, bool isEmpty)
{
        m_filesize = fileSize;
        m_iPartCount = fileSize / PARTSIZE + 1;
        m_sizeLastPart = fileSize % PARTSIZE;
        // file with size of n * PARTSIZE
        if (m_sizeLastPart == 0 
                && fileSize) {  // that's only for pre-init in ctor
                m_sizeLastPart = PARTSIZE;
                m_iPartCount--;
        }
        m_gaplist.clear();
        m_partsComplete.clear();
        if (isEmpty) {
                m_partsComplete.resize(m_iPartCount, incomplete);
                AddGap(0, fileSize - 1);
        } else {
                m_partsComplete.resize(m_iPartCount, complete);
        }
        m_totalGapSizeValid = false;
}


void CGapList::AddGap(uint64 gapstart, uint64 gapend)
{
        if (!ArgCheck(gapstart, gapend)) {
                return;
        }

//      AddDebugLogLineN(logPartFile, CFormat(wxT("  AddGap: %5d - %5d")) % gapstart % gapend);

        // mark involved part(s) as incomplete
        uint16 partlast = gapend / PARTSIZE;
        for (uint16 part = gapstart / PARTSIZE; part <= partlast; part++) {
                m_partsComplete[part] = incomplete;
        }
        // total gap size has to be recalculated
        m_totalGapSizeValid = false;

        // find a place to start:
        // first gap which ends >= our gap start - 1
        // (-1 so we can join adjacent gaps)
        iterator it = m_gaplist.lower_bound(gapstart > 0 ? gapstart - 1 : 0);
        while (it != m_gaplist.end()) {
                iterator it2 = it++;
                uint64 curGapStart = it2->second;
                uint64 curGapEnd   = it2->first;

                if (curGapStart >= gapstart && curGapEnd <= gapend) {
                        // this gap is inside the new gap - delete
                        m_gaplist.erase(it2);
                } else if (curGapStart >= gapstart && curGapStart <= gapend + 1) {
                        // head of this gap is in the new gap, or this gap is
                        // directly behind the new gap - extend limit and delete
                        gapend = curGapEnd;
                        m_gaplist.erase(it2);
                } else if (curGapEnd <= gapend && curGapEnd >= gapstart - 1) {
                        // tail of this gap is in the new gap, or this gap is
                        // directly before the new gap - extend limit and delete
                        gapstart = curGapStart;
                        m_gaplist.erase(it2);
                } else if (curGapStart <= gapstart && curGapEnd >= gapend) {
                        // new gap is already inside this gap - return
                        return;
                // now all cases of overlap are ruled out
                } else if (curGapStart > gapstart) {
                        // this gap is the first behind the new gap -> insert before it
                        it = it2;
                        break;
                }
        }
        // for fastest insertion point to the element AFTER which we want to insert     
        if (it != m_gaplist.begin()) {
                --it;
        }
        m_gaplist.insert(it, std::pair<uint64,uint64>(gapend, gapstart));
}

void CGapList::AddGap(uint16 part)
{
        if (part >= m_iPartCount) {
                wxFAIL;
                return;
        }
        uint64 gapstart = part * PARTSIZE;
        uint64 gapend = gapstart + GetPartSize(part) - 1;
        AddGap(gapstart, gapend);
        m_partsComplete[part] = incomplete;
}

void CGapList::FillGap(uint64 partstart, uint64 partend)
{
        if (!ArgCheck(partstart, partend)) {
                return;
        }

//      AddDebugLogLineN(logPartFile, CFormat(wxT("  FillGap: %5d - %5d")) % partstart % partend);

        // mark involved part(s) to be reexamined for completeness
        uint16 partlast = partend / PARTSIZE;
        for (uint16 part = partstart / PARTSIZE; part <= partlast; part++) {
                m_partsComplete[part] = unknown;
        }
        // also total gap size
        m_totalGapSizeValid = false;

        // find a place to start:
        // first gap which ends >= our part start
        iterator it = m_gaplist.lower_bound(partstart);
        while (it != m_gaplist.end()) {
                iterator it2 = it++;
                uint64 curGapStart = it2->second;
                uint64 curGapEnd   = it2->first;

                if (curGapStart >= partstart) {
                        if (curGapEnd <= partend) {
                                // our part fills this gap completly
                                m_gaplist.erase(it2);
                        } else if (curGapStart <= partend) {
                                // lower part of this gap is in the part - shrink gap:
                                //   (this is the most common case: curGapStart == partstart && curGapEnd > partend)
                                it2->second = partend + 1;
                                // end of our part was in the gap: we're done
                                break;
                        } else {
                                // gap starts behind our part end: we're done
                                break;
                        }
                } else {
                        // curGapStart < partstart
                        if (curGapEnd > partend) {
                                // our part is completely enclosed by the gap
                                // cut it in two, leaving our part out:
                                // shrink the gap so it becomes the second gap
                                it2->second = partend + 1;
                                // insert new first gap
                                iterator it3(it2);
                                if (it3 != m_gaplist.begin()) {
                                        --it3;
                                }
                                m_gaplist.insert(it3, std::pair<uint64,uint64>(partstart - 1, curGapStart));
                                // we're done
                                break;
                        } else if (curGapEnd >= partstart) {
                                // upper part of this gap is in the part - shrink gap:
                                // insert shorter gap
                                iterator it3(it2);
                                if (it3 != m_gaplist.begin()) {
                                        --it3;
                                }
                                m_gaplist.insert(it3, std::pair<uint64,uint64>(partstart - 1, curGapStart));
                                // and delete the old one
                                m_gaplist.erase(it2);
                        }
                        // else: gap is before our part start (should not happen)
                }
        }
}

void CGapList::FillGap(uint16 part)
{
        if (part >= m_iPartCount) {
                wxFAIL;
                return;
        }
        uint64 gapstart = part * PARTSIZE;
        uint64 gapend = gapstart + GetPartSize(part) - 1;
        FillGap(gapstart, gapend);
        m_partsComplete[part] = complete;
}

uint64 CGapList::GetGapSize()
{
        if (!m_totalGapSizeValid) {
                m_totalGapSizeValid = true;
                m_totalGapSize = 0;

                ListType::const_iterator it = m_gaplist.begin();
                for (; it != m_gaplist.end(); it++) {
                        m_totalGapSize += it->first - it->second + 1;
                }
        }
        return m_totalGapSize;
}

uint32 CGapList::GetGapSize(uint16 part) const
{
        uint64 uRangeStart = part * PARTSIZE;
        uint64 uRangeEnd = uRangeStart + GetPartSize(part) - 1;
        uint64 uTotalGapSize = 0;

        // find a place to start:
        // first gap which ends >= our gap start
        ListType::const_iterator it = m_gaplist.lower_bound(uRangeStart);
        for (; it != m_gaplist.end(); ++it) {
                uint64 curGapStart = it->second;
                uint64 curGapEnd   = it->first;

                if (curGapStart <= uRangeStart && curGapEnd >= uRangeEnd) {
                        // total range is in this gap
                        uTotalGapSize += uRangeEnd - uRangeStart + 1;
                        break;
                } else if (curGapStart >= uRangeStart) {
                        if (curGapStart <= uRangeEnd) {
                                // start of this gap is in our range
                                uTotalGapSize += std::min(curGapEnd, uRangeEnd) - curGapStart + 1;
                        } else {
                                // this gap starts behind our range
                                break;
                        }
                } else if (curGapEnd >= uRangeStart && curGapEnd <= uRangeEnd) {
                        // end of this gap is in our range
                        uTotalGapSize += curGapEnd - uRangeStart + 1;
                }
        }

        wxASSERT( uTotalGapSize <= uRangeEnd - uRangeStart + 1 );
        return uTotalGapSize;
}

bool CGapList::IsComplete(uint64 gapstart, uint64 gapend) const
{
        if (!ArgCheck(gapstart, gapend)) {
                return false;
        }

        // find a place to start:
        // first gap which ends >= our gap start
        ListType::const_iterator it = m_gaplist.lower_bound(gapstart);
        for (; it != m_gaplist.end(); ++it) {
                uint64 curGapStart = it->second;
                uint64 curGapEnd   = it->first;

                if (  (curGapStart >= gapstart    && curGapEnd   <= gapend)
                        ||(curGapStart >= gapstart    && curGapStart <= gapend)
                        ||(curGapEnd   <= gapend      && curGapEnd   >= gapstart)
                        ||(gapstart    >= curGapStart && gapend      <= curGapEnd)) {
                        return false;   
                }
                if (curGapStart > gapend) {
                        break;
                }
        }
        return true;
}

bool CGapList::IsComplete(uint16 part)
{
// There is a bug in the ED2K protocol:
// For files of size n * PARTSIZE one part too much is transmitted in the availability bitfield.
// Allow completion detection of this dummy part, and always report it as complete
// (so it doesn't get asked for).
        if (part == m_iPartCount && m_sizeLastPart == PARTSIZE) {
                return true;
        }
// Remaining error check
        if (part >= m_iPartCount) {
                wxFAIL;
                return false;
        }
        ePartComplete status = (ePartComplete) m_partsComplete[part];
        if (status == unknown) {
                uint64 partstart = part * PARTSIZE;
                uint64 partend = partstart + GetPartSize(part) - 1;
                status = IsComplete(partstart, partend) ? complete : incomplete;
                m_partsComplete[part] = status;
        }
        return status == complete;
}

void CGapList::DumpList()
{
        int i = 0;
        for (const_iterator it = begin(); it != end(); ++it) {
                AddDebugLogLineN(logPartFile, CFormat(wxT("  %3d: %5d - %5d")) % i++ % it.start() % it.end());
        }
}

inline bool CGapList::ArgCheck(uint64 gapstart, uint64 &gapend) const
{
        // end < start: serious error
        if (gapend < gapstart) {
                wxFAIL;
                return false;
        }

        // gaps shouldn't go past file anymore either
        if (gapend >= m_filesize) {
                wxFAIL;
                gapend = m_filesize - 1;        // fix it
        }
        return true;
}