solidity/libdevcore/CommonData.cpp

192 lines
4.7 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 CommonData.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include <libdevcore/CommonData.h>
#include <libdevcore/Exceptions.h>
#include <libdevcore/Assertions.h>
#include <libdevcore/Keccak256.h>
#include <libdevcore/FixedHash.h>
#include <boost/algorithm/string.hpp>
using namespace std;
using namespace dev;
namespace
{
static char const* upperHexChars = "0123456789ABCDEF";
static char const* lowerHexChars = "0123456789abcdef";
}
string dev::toHex(uint8_t _data, HexCase _case)
{
assertThrow(_case != HexCase::Mixed, BadHexCase, "Mixed case can only be used for byte arrays.");
char const* chars = _case == HexCase::Upper ? upperHexChars : lowerHexChars;
return std::string{
chars[(unsigned(_data) / 16) & 0xf],
chars[unsigned(_data) & 0xf]
};
}
string dev::toHex(bytes const& _data, HexPrefix _prefix, HexCase _case)
{
std::string ret(_data.size() * 2 + (_prefix == HexPrefix::Add ? 2 : 0), 0);
size_t i = 0;
if (_prefix == HexPrefix::Add)
{
ret[i++] = '0';
ret[i++] = 'x';
}
// Mixed case will be handled inside the loop.
char const* chars = _case == HexCase::Upper ? upperHexChars : lowerHexChars;
int rix = _data.size() - 1;
for (uint8_t c: _data)
{
// switch hex case every four hexchars
if (_case == HexCase::Mixed)
chars = (rix-- & 2) == 0 ? lowerHexChars : upperHexChars;
ret[i++] = chars[(unsigned(c) / 16) & 0xf];
ret[i++] = chars[unsigned(c) & 0xf];
}
assertThrow(i == ret.size(), Exception, "");
return ret;
}
int dev::fromHex(char _i, WhenError _throw)
{
if (_i >= '0' && _i <= '9')
return _i - '0';
if (_i >= 'a' && _i <= 'f')
return _i - 'a' + 10;
if (_i >= 'A' && _i <= 'F')
return _i - 'A' + 10;
if (_throw == WhenError::Throw)
assertThrow(false, BadHexCharacter, to_string(_i));
else
return -1;
}
bytes dev::fromHex(std::string const& _s, WhenError _throw)
{
unsigned s = (_s.size() >= 2 && _s[0] == '0' && _s[1] == 'x') ? 2 : 0;
std::vector<uint8_t> ret;
ret.reserve((_s.size() - s + 1) / 2);
if (_s.size() % 2)
{
int h = fromHex(_s[s++], _throw);
if (h != -1)
ret.push_back(h);
else
return bytes();
}
for (unsigned i = s; i < _s.size(); i += 2)
{
int h = fromHex(_s[i], _throw);
int l = fromHex(_s[i + 1], _throw);
if (h != -1 && l != -1)
ret.push_back((uint8_t)(h * 16 + l));
else
return bytes();
}
return ret;
}
bool dev::passesAddressChecksum(string const& _str, bool _strict)
{
string s = _str.substr(0, 2) == "0x" ? _str : "0x" + _str;
if (s.length() != 42)
return false;
if (!_strict && (
s.find_first_of("abcdef") == string::npos ||
s.find_first_of("ABCDEF") == string::npos
))
return true;
return s == dev::getChecksummedAddress(s);
}
string dev::getChecksummedAddress(string const& _addr)
{
string s = _addr.substr(0, 2) == "0x" ? _addr.substr(2) : _addr;
assertThrow(s.length() == 40, InvalidAddress, "");
assertThrow(s.find_first_not_of("0123456789abcdefABCDEF") == string::npos, InvalidAddress, "");
h256 hash = keccak256(boost::algorithm::to_lower_copy(s, std::locale::classic()));
string ret = "0x";
for (size_t i = 0; i < 40; ++i)
{
char addressCharacter = s[i];
unsigned nibble = (unsigned(hash[i / 2]) >> (4 * (1 - (i % 2)))) & 0xf;
if (nibble >= 8)
ret += toupper(addressCharacter);
else
ret += tolower(addressCharacter);
}
return ret;
}
bool dev::isValidHex(string const& _string)
{
if (_string.substr(0, 2) != "0x")
return false;
if (_string.find_first_not_of("0123456789abcdefABCDEF", 2) != string::npos)
return false;
return true;
}
bool dev::isValidDecimal(string const& _string)
{
if (_string.empty())
return false;
if (_string == "0")
return true;
// No leading zeros
if (_string.front() == '0')
return false;
if (_string.find_first_not_of("0123456789") != string::npos)
return false;
return true;
}
string dev::formatAsStringOrNumber(string const& _value)
{
assertThrow(_value.length() <= 32, StringTooLong, "String to be formatted longer than 32 bytes.");
for (auto const& c: _value)
if (c <= 0x1f || c >= 0x7f || c == '"')
return "0x" + h256(_value, h256::AlignLeft).hex();
return "\"" + _value + "\"";
}