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117 lines
3.8 KiB
117 lines
3.8 KiB
10 years ago
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/*
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This file is part of cpp-ethereum.
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cpp-ethereum 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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cpp-ethereum 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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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file CommonJS.h
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* @authors:
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* Gav Wood <i@gavwood.com>
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* Marek Kotewicz <marek@ethdev.com>
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* @date 2014
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*/
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#pragma once
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#include <string>
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#include "FixedHash.h"
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#include "CommonData.h"
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#include "CommonIO.h"
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namespace dev
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{
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template <unsigned S> std::string toJS(FixedHash<S> const& _h)
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{
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return "0x" + toHex(_h.ref());
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}
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template <unsigned N> std::string toJS(boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N, N, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>> const& _n)
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{
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return "0x" + toHex(toCompactBigEndian(_n));
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}
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inline std::string toJS(dev::bytes const& _n)
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{
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return "0x" + dev::toHex(_n);
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}
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/// Convert string to byte array. Input parameters can be hex or dec. Returns empty array if invalid input e.g neither dec or hex.
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bytes jsToBytes(std::string const& _s);
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/// Add '0' on the head of @a _b until @a _l.
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bytes padded(bytes _b, unsigned _l);
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/// Add '0' on the queue of @a _b until @a _l.
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bytes paddedRight(bytes _b, unsigned _l);
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/// Removing all trailing '0'. Returns empty array if input contains only '0' char.
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bytes unpadded(bytes _s);
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/// Remove all 0 byte on the head of @a _s.
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bytes unpadLeft(bytes _s);
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/// Convert h256 into user-readable string (by directly using std::string constructor).
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std::string fromRaw(h256 _n, unsigned* _inc = nullptr);
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template <unsigned N> FixedHash<N> jsToFixed(std::string const& _s)
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{
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if (_s.substr(0, 2) == "0x")
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// Hex
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return FixedHash<N>(_s.substr(2 + std::max<unsigned>(N * 2, _s.size() - 2) - N * 2));
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else if (_s.find_first_not_of("0123456789") == std::string::npos)
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// Decimal
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return (typename FixedHash<N>::Arith)(_s);
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else
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// Binary
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return FixedHash<N>(); // FAIL
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}
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inline std::string jsToFixed(double _s)
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{
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return toJS(dev::u256(_s * (double)(dev::u256(1) << 128)));
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}
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template <unsigned N> boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N * 8, N * 8, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>> jsToInt(std::string const& _s)
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{
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if (_s.substr(0, 2) == "0x")
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// Hex
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return fromBigEndian<boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N * 8, N * 8, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>>(fromHex(_s.substr(2)));
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else if (_s.find_first_not_of("0123456789") == std::string::npos)
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// Decimal
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return boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N * 8, N * 8, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>(_s);
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else
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// Binary
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return 0; // FAIL
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}
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inline u256 jsToU256(std::string const& _s) { return jsToInt<32>(_s); }
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inline std::string jsToDecimal(std::string const& _s)
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{
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return dev::toString(jsToU256(_s));
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}
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inline std::string jsFromBinary(dev::bytes _s, unsigned _padding = 32)
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{
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_s.resize(std::max<unsigned>(_s.size(), _padding));
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return "0x" + dev::toHex(_s);
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}
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inline std::string jsFromBinary(std::string const& _s, unsigned _padding = 32)
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{
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return jsFromBinary(asBytes(_s), _padding);
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}
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inline double jsFromFixed(std::string const& _s)
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{
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return (double)jsToU256(_s) / (double)(dev::u256(1) << 128);
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}
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}
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