You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
1.8 KiB
79 lines
1.8 KiB
// Copyright (c) 2014-2018 The Bitcoin Core developers
|
|
// Distributed under the MIT software license, see the accompanying
|
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
|
|
|
#ifndef BITCOIN_TIMEDATA_H
|
|
#define BITCOIN_TIMEDATA_H
|
|
|
|
#include <algorithm>
|
|
#include <assert.h>
|
|
#include <stdint.h>
|
|
#include <vector>
|
|
|
|
static const int64_t DEFAULT_MAX_TIME_ADJUSTMENT = 35 * 60;
|
|
|
|
class CNetAddr;
|
|
|
|
/**
|
|
* Median filter over a stream of values.
|
|
* Returns the median of the last N numbers
|
|
*/
|
|
template <typename T>
|
|
class CMedianFilter
|
|
{
|
|
private:
|
|
std::vector<T> vValues;
|
|
std::vector<T> vSorted;
|
|
unsigned int nSize;
|
|
|
|
public:
|
|
CMedianFilter(unsigned int _size, T initial_value) : nSize(_size)
|
|
{
|
|
vValues.reserve(_size);
|
|
vValues.push_back(initial_value);
|
|
vSorted = vValues;
|
|
}
|
|
|
|
void input(T value)
|
|
{
|
|
if (vValues.size() == nSize) {
|
|
vValues.erase(vValues.begin());
|
|
}
|
|
vValues.push_back(value);
|
|
|
|
vSorted.resize(vValues.size());
|
|
std::copy(vValues.begin(), vValues.end(), vSorted.begin());
|
|
std::sort(vSorted.begin(), vSorted.end());
|
|
}
|
|
|
|
T median() const
|
|
{
|
|
int vSortedSize = vSorted.size();
|
|
assert(vSortedSize > 0);
|
|
if (vSortedSize & 1) // Odd number of elements
|
|
{
|
|
return vSorted[vSortedSize / 2];
|
|
} else // Even number of elements
|
|
{
|
|
return (vSorted[vSortedSize / 2 - 1] + vSorted[vSortedSize / 2]) / 2;
|
|
}
|
|
}
|
|
|
|
int size() const
|
|
{
|
|
return vValues.size();
|
|
}
|
|
|
|
std::vector<T> sorted() const
|
|
{
|
|
return vSorted;
|
|
}
|
|
};
|
|
|
|
/** Functions to keep track of adjusted P2P time */
|
|
int64_t GetTimeOffset();
|
|
int64_t GetAdjustedTime();
|
|
void AddTimeData(const CNetAddr& ip, int64_t nTime);
|
|
|
|
#endif // BITCOIN_TIMEDATA_H
|