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/*
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 validateUTF8(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;
}
}
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