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 "";
}
 
}