431 lines
13 KiB
C++
431 lines
13 KiB
C++
/*
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* This file is part of the Flowee project
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* Copyright (C) 2009-2010 Satoshi Nakamoto
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* Copyright (C) 2009-2015 The Bitcoin Core developers
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef FLOWEE_STREAMS_H
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#define FLOWEE_STREAMS_H
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#include "serialize.h"
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#include <algorithm>
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#include <cassert>
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#include <ios>
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#include <limits>
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#include <map>
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#include <set>
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#include <cstdint>
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#include <cstdio>
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#include <string>
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#include <cstring>
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#include <utility>
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#include <vector>
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/** Double ended buffer combining vector and stream-like interfaces.
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*
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* >> and << read and write unformatted data using the above serialization templates.
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* Fills with data in linear time; some stringstream implementations take N^2 time.
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*/
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class CDataStream
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{
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protected:
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typedef std::vector<char> vector_type;
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vector_type vch;
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unsigned int nReadPos;
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public:
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int nType;
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int nVersion;
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typedef vector_type::allocator_type allocator_type;
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typedef vector_type::size_type size_type;
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typedef vector_type::difference_type difference_type;
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typedef vector_type::reference reference;
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typedef vector_type::const_reference const_reference;
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typedef vector_type::value_type value_type;
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typedef vector_type::iterator iterator;
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typedef vector_type::const_iterator const_iterator;
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typedef vector_type::reverse_iterator reverse_iterator;
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explicit CDataStream(int nTypeIn, int nVersionIn)
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{
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Init(nTypeIn, nVersionIn);
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}
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CDataStream(const_iterator pbegin, const_iterator pend, int nTypeIn, int nVersionIn) : vch(pbegin, pend)
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{
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Init(nTypeIn, nVersionIn);
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}
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#if !defined(_MSC_VER) || _MSC_VER >= 1300
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CDataStream(const char* pbegin, const char* pend, int nTypeIn, int nVersionIn) : vch(pbegin, pend)
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{
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Init(nTypeIn, nVersionIn);
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}
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#endif
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CDataStream(const std::vector<char>& vchIn, int nTypeIn, int nVersionIn) : vch(vchIn.begin(), vchIn.end())
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{
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Init(nTypeIn, nVersionIn);
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}
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CDataStream(const std::vector<unsigned char>& vchIn, int nTypeIn, int nVersionIn) : vch(vchIn.begin(), vchIn.end())
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{
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Init(nTypeIn, nVersionIn);
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}
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void Init(int nTypeIn, int nVersionIn)
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{
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nReadPos = 0;
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nType = nTypeIn;
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nVersion = nVersionIn;
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}
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CDataStream& operator+=(const CDataStream& b)
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{
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vch.insert(vch.end(), b.begin(), b.end());
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return *this;
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}
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friend CDataStream operator+(const CDataStream& a, const CDataStream& b)
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{
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CDataStream ret = a;
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ret += b;
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return (ret);
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}
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std::string str() const
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{
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return (std::string(begin(), end()));
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}
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//
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// Vector subset
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//
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const_iterator begin() const { return vch.begin() + nReadPos; }
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iterator begin() { return vch.begin() + nReadPos; }
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const char * const_data() const { return vch.data(); }
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const_iterator end() const { return vch.end(); }
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iterator end() { return vch.end(); }
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size_type size() const { return vch.size() - nReadPos; }
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bool empty() const { return vch.size() == nReadPos; }
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void resize(size_type n, value_type c=0) { vch.resize(n + nReadPos, c); }
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void reserve(size_type n) { vch.reserve(n + nReadPos); }
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const_reference operator[](size_type pos) const { return vch[pos + nReadPos]; }
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reference operator[](size_type pos) { return vch[pos + nReadPos]; }
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void clear() { vch.clear(); nReadPos = 0; }
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iterator insert(iterator it, const char& x=char()) { return vch.insert(it, x); }
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void insert(iterator it, size_type n, const char& x) { vch.insert(it, n, x); }
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void insert(iterator it, std::vector<char>::const_iterator first, std::vector<char>::const_iterator last)
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{
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assert(last - first >= 0);
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if (it == vch.begin() + nReadPos && (unsigned int)(last - first) <= nReadPos)
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{
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// special case for inserting at the front when there's room
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nReadPos -= (last - first);
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memcpy(&vch[nReadPos], &first[0], last - first);
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}
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else
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vch.insert(it, first, last);
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}
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#if !defined(_MSC_VER) || _MSC_VER >= 1300
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void insert(iterator it, const char* first, const char* last)
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{
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assert(last - first >= 0);
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if (it == vch.begin() + nReadPos && (unsigned int)(last - first) <= nReadPos)
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{
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// special case for inserting at the front when there's room
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nReadPos -= (last - first);
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memcpy(&vch[nReadPos], &first[0], last - first);
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}
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else
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vch.insert(it, first, last);
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}
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#endif
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iterator erase(iterator it)
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{
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if (it == vch.begin() + nReadPos)
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{
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// special case for erasing from the front
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if (++nReadPos >= vch.size())
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{
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// whenever we reach the end, we take the opportunity to clear the buffer
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nReadPos = 0;
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return vch.erase(vch.begin(), vch.end());
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}
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return vch.begin() + nReadPos;
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}
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else
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return vch.erase(it);
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}
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iterator erase(iterator first, iterator last)
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{
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if (first == vch.begin() + nReadPos)
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{
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// special case for erasing from the front
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if (last == vch.end())
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{
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nReadPos = 0;
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return vch.erase(vch.begin(), vch.end());
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}
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else
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{
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nReadPos = (last - vch.begin());
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return last;
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}
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}
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else
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return vch.erase(first, last);
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}
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inline void Compact()
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{
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vch.erase(vch.begin(), vch.begin() + nReadPos);
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nReadPos = 0;
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}
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bool Rewind(size_type n)
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{
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// Rewind by n characters if the buffer hasn't been compacted yet
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if (n > nReadPos)
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return false;
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nReadPos -= n;
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return true;
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}
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//
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// Stream subset
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//
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bool eof() const { return size() == 0; }
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CDataStream* rdbuf() { return this; }
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int in_avail() { return size(); }
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void SetType(int n) { nType = n; }
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int GetType() { return nType; }
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void SetVersion(int n) { nVersion = n; }
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int GetVersion() { return nVersion; }
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void ReadVersion() { *this >> nVersion; }
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void WriteVersion() { *this << nVersion; }
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CDataStream& read(char* pch, size_t nSize)
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{
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// Read from the beginning of the buffer
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unsigned int nReadPosNext = nReadPos + nSize;
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if (nReadPosNext >= vch.size())
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{
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if (nReadPosNext > vch.size())
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{
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throw std::ios_base::failure("CDataStream::read(): end of data");
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}
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memcpy(pch, &vch[nReadPos], nSize);
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nReadPos = 0;
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vch.clear();
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return (*this);
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}
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memcpy(pch, &vch[nReadPos], nSize);
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nReadPos = nReadPosNext;
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return (*this);
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}
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CDataStream& ignore(int nSize)
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{
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// Ignore from the beginning of the buffer
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assert(nSize >= 0);
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unsigned int nReadPosNext = nReadPos + nSize;
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if (nReadPosNext >= vch.size())
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{
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if (nReadPosNext > vch.size())
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throw std::ios_base::failure("CDataStream::ignore(): end of data");
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nReadPos = 0;
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vch.clear();
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return (*this);
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}
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nReadPos = nReadPosNext;
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return (*this);
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}
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CDataStream& write(const char* pch, size_t nSize)
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{
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// Write to the end of the buffer
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vch.insert(vch.end(), pch, pch + nSize);
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return (*this);
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}
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template<typename Stream>
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void Serialize(Stream& s, int nType, int nVersion) const
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{
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// Special case: stream << stream concatenates like stream += stream
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if (!vch.empty())
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s.write((char*)&vch[0], vch.size() * sizeof(vch[0]));
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}
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template<typename T>
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unsigned int GetSerializeSize(const T& obj)
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{
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// Tells the size of the object if serialized to this stream
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return ::GetSerializeSize(obj, nType, nVersion);
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}
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template<typename T>
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CDataStream& operator<<(const T& obj)
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{
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// Serialize to this stream
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::Serialize(*this, obj, nType, nVersion);
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return (*this);
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}
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template<typename T>
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CDataStream& operator>>(T& obj)
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{
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// Unserialize from this stream
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::Unserialize(*this, obj, nType, nVersion);
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return (*this);
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}
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void GetAndClear(vector_type &data) {
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data.insert(data.end(), begin(), end());
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clear();
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}
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};
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/** Non-refcounted RAII wrapper for FILE*
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*
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* Will automatically close the file when it goes out of scope if not null.
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* If you're returning the file pointer, return file.release().
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* If you need to close the file early, use file.fclose() instead of fclose(file).
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*/
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class CAutoFile
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{
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private:
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// Disallow copies
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CAutoFile(const CAutoFile&);
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CAutoFile& operator=(const CAutoFile&);
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int nType;
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int nVersion;
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FILE* file;
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public:
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CAutoFile(FILE* filenew, int nTypeIn, int nVersionIn)
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{
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file = filenew;
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nType = nTypeIn;
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nVersion = nVersionIn;
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}
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~CAutoFile()
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{
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fclose();
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}
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void fclose()
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{
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if (file) {
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::fclose(file);
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file = NULL;
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}
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}
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/** Get wrapped FILE* with transfer of ownership.
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* @note This will invalidate the CAutoFile object, and makes it the responsibility of the caller
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* of this function to clean up the returned FILE*.
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*/
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FILE* release() { FILE* ret = file; file = NULL; return ret; }
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/** Get wrapped FILE* without transfer of ownership.
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* @note Ownership of the FILE* will remain with this class. Use this only if the scope of the
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* CAutoFile outlives use of the passed pointer.
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*/
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FILE* Get() const { return file; }
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/** Return true if the wrapped FILE* is NULL, false otherwise.
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*/
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bool IsNull() const { return (file == NULL); }
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//
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// Stream subset
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//
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void SetType(int n) { nType = n; }
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int GetType() { return nType; }
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void SetVersion(int n) { nVersion = n; }
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int GetVersion() { return nVersion; }
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void ReadVersion() { *this >> nVersion; }
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void WriteVersion() { *this << nVersion; }
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CAutoFile& read(char* pch, size_t nSize)
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{
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if (!file)
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throw std::ios_base::failure("CAutoFile::read: file handle is NULL");
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if (fread(pch, 1, nSize, file) != nSize)
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throw std::ios_base::failure(feof(file) ? "CAutoFile::read: end of file" : "CAutoFile::read: fread failed");
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return (*this);
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}
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CAutoFile& write(const char* pch, size_t nSize)
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{
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if (!file)
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throw std::ios_base::failure("CAutoFile::write: file handle is NULL");
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if (fwrite(pch, 1, nSize, file) != nSize)
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throw std::ios_base::failure("CAutoFile::write: write failed");
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return (*this);
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}
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template<typename T>
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unsigned int GetSerializeSize(const T& obj)
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{
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// Tells the size of the object if serialized to this stream
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return ::GetSerializeSize(obj, nType, nVersion);
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}
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template<typename T>
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CAutoFile& operator<<(const T& obj)
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{
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// Serialize to this stream
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if (!file)
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throw std::ios_base::failure("CAutoFile::operator<<: file handle is NULL");
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::Serialize(*this, obj, nType, nVersion);
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return (*this);
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}
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template<typename T>
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CAutoFile& operator>>(T& obj)
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{
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// Unserialize from this stream
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if (!file)
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throw std::ios_base::failure("CAutoFile::operator>>: file handle is NULL");
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::Unserialize(*this, obj, nType, nVersion);
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return (*this);
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}
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};
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#endif
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