CommonJS.cpp

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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/>.
*/
#include "CommonJS.h"

using namespace std;

namespace dev
{

bytes jsToBytes(string const& _s, OnFailed _f)
{
        try
        {
                return fromHex(_s, WhenError::Throw);
        }
        catch (...)
        {
                if (_f == OnFailed::InterpretRaw)
                        return asBytes(_s);
                else if (_f == OnFailed::Throw)
                        throw invalid_argument("Cannot intepret '" + _s + "' as bytes; must be 0x-prefixed hex or decimal.");
        }
        return bytes();
}

bytes padded(bytes _b, unsigned _l)
{
        while (_b.size() < _l)
                _b.insert(_b.begin(), 0);
        return asBytes(asString(_b).substr(_b.size() - max(_l, _l)));
}

bytes paddedRight(bytes _b, unsigned _l)
{
        _b.resize(_l);
        return _b;
}

bytes unpadded(bytes _b)
{
        auto p = asString(_b).find_last_not_of((char)0);
        _b.resize(p == string::npos ? 0 : (p + 1));
        return _b;
}

bytes unpadLeft(bytes _b)
{
        unsigned int i = 0;
        if (_b.size() == 0)
                return _b;

        while (i < _b.size() && _b[i] == byte(0))
                i++;

        if (i != 0)
                _b.erase(_b.begin(), _b.begin() + i);
        return _b;
}

string fromRaw(h256 _n)
{
        if (_n)
        {
                string s((char const*)_n.data(), 32);
                auto l = s.find_first_of('\0');
                if (!l)
                        return "";
                if (l != string::npos)
                        s.resize(l);
                for (auto i: s)
                        if (i < 32)
                                return "";
                return s;
        }
        return "";
}

}