mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
82 lines
1.5 KiB
C++
82 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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/** @file UTF8.cpp
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* @author Alex Beregszaszi
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* @date 2016
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*
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* UTF-8 related helpers
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*/
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#include "UTF8.h"
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namespace dev
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{
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bool validateUTF8(std::string const& _input, size_t& _invalidPosition)
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{
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const size_t length = _input.length();
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bool valid = true;
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size_t i = 0;
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for (; i < length; i++)
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{
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if ((unsigned char)_input[i] < 0x80)
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continue;
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size_t count = 0;
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switch(_input[i] & 0xf0) {
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case 0xc0: count = 1; break;
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case 0xe0: count = 2; break;
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case 0xf0: count = 3; break;
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default: break;
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}
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if (count == 0)
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{
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valid = false;
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break;
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}
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if ((i + count) >= length)
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{
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valid = false;
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break;
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}
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for (size_t j = 0; j < count; j++)
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{
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i++;
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if ((_input[i] & 0xc0) != 0x80)
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{
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valid = false;
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break;
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}
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}
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}
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if (valid)
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return true;
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_invalidPosition = i;
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return false;
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}
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}
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