#include "HashUtils.h"

#include <cryptopp/sha.h>
#include <cryptopp/files.h>
#include <cryptopp/hex.h>

using CryptoPP::SHA256;
using CryptoPP::FileSource;
using CryptoPP::HashFilter;
using CryptoPP::HexEncoder;
using CryptoPP::StringSink;
namespace fs = boost::filesystem;

std::string calcSHA256(const fs::path& file)
{
    SHA256 hash;
    std::string digest;

    FileSource f(
        file.native().c_str(),
        true,
        new HashFilter(
            hash,
            new HexEncoder(
                new StringSink(
                    digest))));

    return digest;
}

uint64_t fletcher64(uint32_t *data, int count)
{
    uint64_t sum1 = 0;
    uint64_t sum2 = 0;
    int index;

    for (index = 0; index < count; ++index)
    {
        sum1 = (sum1 + data[index]) % std::numeric_limits<uint32_t>::max();
        sum2 = (sum2 + sum1) % std::numeric_limits<uint32_t>::max();
    }

    return (sum2 << std::numeric_limits<uint32_t>::digits) | sum1;
}