void Download::open(int64_t bytes, bool z, bool hasDownloadedBytes) {
if(getType() == Transfer::TYPE_FILE) {
auto target = getDownloadTarget();
auto fullSize = tt.getFileSize();
if(getOverlapped() && bundle) {
setOverlapped(false);
bool found = false;
// ok, we got a fast slot, so it's possible to disconnect original user now
for(auto d: bundle->getDownloads()) {
if(d != this && compare(d->getPath(), getPath()) == 0 && d->getSegment().contains(getSegment())) {
// overlapping has no sense if segment is going to finish
if(d->getSecondsLeft() < 10)
break;
found = true;
// disconnect slow chunk
d->getUserConnection().disconnect();
break;
}
}
if(!found) {
// slow chunk already finished ???
throw Exception(STRING(DOWNLOAD_FINISHED_IDLE));
}
}
if(hasDownloadedBytes) {
if(File::getSize(target) != fullSize) {
// When trying the download the next time, the resume pos will be reset
throw Exception(CSTRING(TARGET_FILE_MISSING));
}
} else {
File::ensureDirectory(target);
}
int flags = File::OPEN | File::CREATE | File::SHARED_WRITE;
if (getSegment().getEnd() != fullSize) {
//segmented download, let Windows decide the buffering
flags |= File::BUFFER_AUTO;
}
unique_ptr<SharedFileStream> f(new SharedFileStream(target, File::WRITE, flags));
if(f->getSize() != fullSize) {
f->setSize(fullSize);
}
f->setPos(getSegment().getStart());
output = move(f);
tempTarget = target;
} else if(getType() == Transfer::TYPE_FULL_LIST) {
auto target = getPath();
File::ensureDirectory(target);
if(isSet(Download::FLAG_XML_BZ_LIST)) {
target += ".xml.bz2";
} else {
target += ".xml";
}
output.reset(new File(target, File::WRITE, File::OPEN | File::TRUNCATE | File::CREATE));
tempTarget = target;
} else if(getType() == Transfer::TYPE_PARTIAL_LIST) {
output.reset(new StringOutputStream(pfs));
} else if(getType() == Transfer::TYPE_TREE) {
output.reset(new MerkleTreeOutputStream<TigerTree>(tt));
}
if((getType() == Transfer::TYPE_FILE || getType() == Transfer::TYPE_FULL_LIST) && SETTING(BUFFER_SIZE) > 0 ) {
output.reset(new BufferedOutputStream<true>(output.release()));
}
if(getType() == Transfer::TYPE_FILE && !SettingsManager::lanMode) {
typedef MerkleCheckOutputStream<TigerTree, true> MerkleStream;
output.reset(new MerkleStream(tt, output.release(), getStartPos()));
setFlag(Download::FLAG_TTH_CHECK);
}
// Check that we don't get too many bytes
output.reset(new LimitedOutputStream<true>(output.release(), bytes));
if(z) {
setFlag(Download::FLAG_ZDOWNLOAD);
output.reset(new FilteredOutputStream<UnZFilter, true>(output.release()));
}
}
Range getOverlapped(const Range& a, const Range& b){
if(a.first > b.first) return getOverlapped(b, a);
if(b.first > a.second) return NULL_RANGE;
return Range(b.first, (a.second > b.second)? b.second : a.second);
}