HexParser.h

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#pragma once
#include "ByteArray.h"
#include "catapult/exceptions.h"
 
namespace catapult { namespace utils {
 
    uint8_t ParseByte(char ch1, char ch2);
 
    bool TryParseByte(char ch1, char ch2, uint8_t& by);
 
    template<typename TContainer>
    bool TryParseHexStringIntoContainer(const char* const pHexData, size_t dataSize, TContainer& outputContainer) {
        if (2 * outputContainer.size() != dataSize)
            return false;
 
        for (auto i = 0u; i < dataSize; i += 2) {
            if (!TryParseByte(pHexData[i], pHexData[i + 1], outputContainer[i / 2]))
                return false;
        }
 
        return true;
    }
 
    template<typename TContainer>
    void ParseHexStringIntoContainer(const char* const pHexData, size_t dataSize, TContainer& outputContainer) {
        // do not implement in terms of TryParseHexStringIntoContainer in order to provide better exception messages
        if (2 * outputContainer.size() != dataSize)
            CATAPULT_THROW_INVALID_ARGUMENT_1("hex string has unexpected size", dataSize);
 
        for (auto i = 0u; i < dataSize; i += 2)
            outputContainer[i / 2] = ParseByte(pHexData[i], pHexData[i + 1]);
    }
 
    template<typename TByteArray>
    TByteArray ParseByteArray(const std::string& hexString) {
        TByteArray array;
        utils::ParseHexStringIntoContainer(hexString.c_str(), hexString.size(), array);
        return array;
    }
}}