// Copyright (c) 2012-2014, The CryptoNote developers, The Bytecoin developers
//
// This file is part of Bytecoin.
//
// Bytecoin is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Bytecoin 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Bytecoin. If not, see .
#pragma once
#include
#include
#include
#include
#include
namespace tools {
template
typename std::enable_if::value && std::is_unsigned::value, void>::type
write_varint(OutputIt &&dest, T i) {
while (i >= 0x80) {
*dest++ = (static_cast(i) & 0x7f) | 0x80;
i >>= 7;
}
*dest++ = static_cast(i);
}
template
std::string get_varint_data(const t_type& v)
{
std::stringstream ss;
write_varint(std::ostreambuf_iterator(ss), v);
return ss.str();
}
template
typename std::enable_if::value && std::is_unsigned::value && 0 <= bits && bits <= std::numeric_limits::digits, int>::type
read_varint(InputIt &&first, InputIt &&last, T &i) {
int read = 0;
i = 0;
for (int shift = 0;; shift += 7) {
if (first == last) {
return read; // End of input.
}
unsigned char byte = *first++;
++read;
if (shift + 7 >= bits && byte >= 1 << (bits - shift)) {
return -1; // Overflow.
}
if (byte == 0 && shift != 0) {
return -2; // Non-canonical representation.
}
i |= static_cast(byte & 0x7f) << shift;
if ((byte & 0x80) == 0) {
break;
}
}
return read;
}
template
int read_varint(InputIt &&first, InputIt &&last, T &i) {
return read_varint::digits, InputIt, T>(std::move(first), std::move(last), i);
}
}