mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
142 lines
2.8 KiB
C++
142 lines
2.8 KiB
C++
/*
|
|
This file is part of solidity.
|
|
|
|
solidity 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.
|
|
|
|
solidity 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 solidity. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/** @file UTF8.cpp
|
|
* @author Alex Beregszaszi
|
|
* @date 2016
|
|
*
|
|
* UTF-8 related helpers
|
|
*/
|
|
|
|
#include <libsolutil/UTF8.h>
|
|
|
|
namespace solidity::util
|
|
{
|
|
namespace
|
|
{
|
|
|
|
/// Validate byte sequence against Unicode chapter 3 Table 3-7.
|
|
bool isWellFormed(unsigned char byte1, unsigned char byte2)
|
|
{
|
|
if (byte1 == 0xc0 || byte1 == 0xc1)
|
|
return false;
|
|
else if (byte1 >= 0xc2 && byte1 <= 0xdf)
|
|
return true;
|
|
else if (byte1 == 0xe0)
|
|
{
|
|
if (byte2 < 0xa0)
|
|
return false;
|
|
else
|
|
return true;
|
|
}
|
|
else if (byte1 >= 0xe1 && byte1 <= 0xec)
|
|
return true;
|
|
else if (byte1 == 0xed)
|
|
{
|
|
if (byte2 > 0x9f)
|
|
return false;
|
|
else
|
|
return true;
|
|
}
|
|
else if (byte1 == 0xee || byte1 == 0xef)
|
|
return true;
|
|
else if (byte1 == 0xf0)
|
|
{
|
|
if (byte2 < 0x90)
|
|
return false;
|
|
else
|
|
return true;
|
|
}
|
|
else if (byte1 >= 0xf1 && byte1 <= 0xf3)
|
|
return true;
|
|
else if (byte1 == 0xf4)
|
|
{
|
|
if (byte2 > 0x8f)
|
|
return false;
|
|
else
|
|
return true;
|
|
}
|
|
/// 0xf5 .. 0xf7 is disallowed
|
|
/// Technically anything below 0xc0 or above 0xf7 is
|
|
/// not possible to encode using Table 3-6 anyway.
|
|
return false;
|
|
}
|
|
|
|
}
|
|
|
|
bool validateUTF8(unsigned char const* _input, size_t _length, size_t& _invalidPosition)
|
|
{
|
|
bool valid = true;
|
|
size_t i = 0;
|
|
|
|
for (; i < _length; i++)
|
|
{
|
|
// Check for Unicode Chapter 3 Table 3-6 conformity.
|
|
if (_input[i] < 0x80)
|
|
continue;
|
|
|
|
size_t count = 0;
|
|
if (_input[i] >= 0xc0 && _input[i] <= 0xdf)
|
|
count = 1;
|
|
else if (_input[i] >= 0xe0 && _input[i] <= 0xef)
|
|
count = 2;
|
|
else if (_input[i] >= 0xf0 && _input[i] <= 0xf7)
|
|
count = 3;
|
|
|
|
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;
|
|
}
|
|
|
|
// Check for Unicode Chapter 3 Table 3-7 conformity.
|
|
if ((j == 0) && !isWellFormed(_input[i - 1], _input[i]))
|
|
{
|
|
valid = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (valid)
|
|
return true;
|
|
|
|
_invalidPosition = i;
|
|
return false;
|
|
}
|
|
|
|
bool validateUTF8(std::string const& _input, size_t& _invalidPosition)
|
|
{
|
|
return validateUTF8(reinterpret_cast<unsigned char const*>(_input.c_str()), _input.length(), _invalidPosition);
|
|
}
|
|
|
|
}
|