dnp3cgi/src/HexData.cpp at 7e4d25d28ca780f01a6f5a4d5bba3fcc3c9cc56c · dnp3/dnp3cgi · GitHub

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#include "HexData.h"

#include <sstream>
#include <stdexcept>

using namespace std;
using namespace opendnp3;

HexData::HexData(const std::string& hex, bool allowBadChars)
    : HexData(RemoveBadCharacters(hex, allowBadChars))
{

}

HexData::HexData(const std::string& valid) : m_buffer()
{
    auto NUM_BYTES = valid.size()/2;

    for(size_t pos = 0; pos < NUM_BYTES; ++pos)
    {
        uint32_t val;
        std::stringstream ss;
        ss << std::hex << valid.substr(2*pos, 2);
        if((ss >> val).fail())
        {
            throw std::invalid_argument("failed to convert hex");
        }
        m_buffer[pos] = static_cast<uint8_t>(val);
    }
}

opendnp3::Buffer HexData::GetSlice() const
{
    return Buffer(m_buffer.data(), m_buffer.size());
}

std::string HexData::RemoveBadCharacters(const std::string& hex, bool allowBadChars)
{
    ostringstream oss;

    for(const char& c : hex)
    {
        if(IsHexChar(c))
        {
            oss << c;
        }
        else if(c != ' ' && !allowBadChars)
        {
            throw std::invalid_argument("Bad character");
        }
    }

    return oss.str();
}

bool HexData::IsHexChar(char i)
{
    return IsDigit(i) || IsUpperHexAlpha(i) || IsLowerHexAlpha(i);
}

bool HexData::IsDigit(char i)
{
    return (i >= '0') && (i <= '9');
}

bool HexData::IsUpperHexAlpha(char i)
{
    return (i >= 'A') && (i <= 'F');
}

bool HexData::IsLowerHexAlpha(char i)
{
    return (i >= 'a') && (i <= 'f');
}