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++
/*
|
|
This file is part of cpp-ethereum.
|
|
|
|
cpp-ethereum is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
cpp-ethereum 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/** @file UTF8.cpp
|
|
* @author Alex Beregszaszi
|
|
* @date 2016
|
|
*
|
|
* UTF-8 related helpers
|
|
*/
|
|
|
|
#include "UTF8.h"
|
|
|
|
|
|
namespace dev
|
|
{
|
|
|
|
|
|
bool validate(std::string const& _input, size_t& _invalidPosition)
|
|
{
|
|
const size_t length = _input.length();
|
|
bool valid = true;
|
|
size_t i = 0;
|
|
|
|
for (; i < length; i++)
|
|
{
|
|
if ((unsigned char)_input[i] < 0x80)
|
|
continue;
|
|
|
|
size_t count = 0;
|
|
switch(_input[i] & 0xe0) {
|
|
case 0xc0: count = 1; break;
|
|
case 0xe0: count = 2; break;
|
|
case 0xf0: count = 3; break;
|
|
default: break;
|
|
}
|
|
|
|
if (count == 0)
|
|
{
|
|
valid = false;
|
|
break;
|
|
}
|
|
|
|
if ((i + count) >= length)
|
|
{
|
|
valid = false;
|
|
break;
|
|
}
|
|
|
|
for (size_t j = 0; j < count; j++)
|
|
{
|
|
i++;
|
|
if ((_input[i] & 0xc0) != 0x80)
|
|
{
|
|
valid = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (valid)
|
|
return true;
|
|
|
|
_invalidPosition = i;
|
|
return false;
|
|
}
|
|
|
|
|
|
}
|