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64 lines
2.9 KiB
64 lines
2.9 KiB
/*
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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 ABI.h
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#pragma once
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#include <libdevcore/Common.h>
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#include <libdevcore/FixedHash.h>
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#include <libdevcore/CommonData.h>
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#include <libdevcrypto/SHA3.h>
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namespace dev
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{
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namespace eth
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{
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template <class T> struct ABISerialiser {};
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template <unsigned N> struct ABISerialiser<FixedHash<N>> { static bytes serialise(FixedHash<N> const& _t) { static_assert(N <= 32, "Cannot serialise hash > 32 bytes."); static_assert(N > 0, "Cannot serialise zero-length hash."); return bytes(32 - N, 0) + _t.asBytes(); } };
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template <> struct ABISerialiser<u256> { static bytes serialise(u256 const& _t) { return h256(_t).asBytes(); } };
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template <> struct ABISerialiser<u160> { static bytes serialise(u160 const& _t) { return bytes(12, 0) + h160(_t).asBytes(); } };
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template <> struct ABISerialiser<string32> { static bytes serialise(string32 const& _t) { return bytesConstRef((byte const*)_t.data(), 32).toBytes(); } };
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inline bytes abiInAux() { return {}; }
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template <class T, class ... U> bytes abiInAux(T const& _t, U const& ... _u)
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{
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return ABISerialiser<T>::serialise(_t) + abiInAux(_u ...);
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}
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template <class ... T> bytes abiIn(std::string _id, T const& ... _t)
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{
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return sha3(_id).ref().cropped(0, 4).toBytes() + abiInAux(_t ...);
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}
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template <class T> struct ABIDeserialiser {};
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template <unsigned N> struct ABIDeserialiser<FixedHash<N>> { static FixedHash<N> deserialise(bytesConstRef& io_t) { static_assert(N <= 32, "Parameter sizes must be at most 32 bytes."); FixedHash<N> ret; io_t.cropped(32 - N, N).populate(ret.ref()); io_t = io_t.cropped(32); return ret; } };
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template <> struct ABIDeserialiser<u256> { static u256 deserialise(bytesConstRef& io_t) { u256 ret = fromBigEndian<u256>(io_t.cropped(0, 32)); io_t = io_t.cropped(32); return ret; } };
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template <> struct ABIDeserialiser<u160> { static u160 deserialise(bytesConstRef& io_t) { u160 ret = fromBigEndian<u160>(io_t.cropped(12, 20)); io_t = io_t.cropped(32); return ret; } };
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template <> struct ABIDeserialiser<string32> { static string32 deserialise(bytesConstRef& io_t) { string32 ret; io_t.cropped(0, 32).populate(bytesRef((byte*)ret.data(), 32)); io_t = io_t.cropped(32); return ret; } };
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template <class T> T abiOut(bytes const& _data)
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{
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bytesConstRef o(&_data);
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return ABIDeserialiser<T>::deserialise(o);
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}
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}
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}
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