mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
/*
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This file is part of solidity.
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solidity 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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solidity 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 solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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#pragma once
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#include <libsolutil/Common.h>
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namespace solidity::util
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{
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inline bytes lebEncode(uint64_t _n)
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{
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bytes encoded;
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while (_n > 0x7f)
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{
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encoded.emplace_back(uint8_t(0x80 | (_n & 0x7f)));
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_n >>= 7;
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}
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encoded.emplace_back(_n);
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return encoded;
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}
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// signed right shift is an arithmetic right shift
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static_assert((-1 >> 1) == -1, "Arithmetic shift not supported.");
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inline bytes lebEncodeSigned(int64_t _n)
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{
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// Based on https://github.com/llvm/llvm-project/blob/master/llvm/include/llvm/Support/LEB128.h
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bytes result;
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bool more;
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do
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{
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uint8_t v = _n & 0x7f;
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_n >>= 7;
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more = !((((_n == 0) && ((v & 0x40) == 0)) || ((_n == -1) && ((v & 0x40) != 0))));
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if (more)
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v |= 0x80; // Mark this byte to show that more bytes will follow.
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result.emplace_back(v);
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}
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while (more);
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return result;
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}
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}
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