hush3/src/zcash/util.cpp

// Copyright (c) 2019-2020 The Hush developers
// Distributed under the GPLv3 software license, see the accompanying
// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html

#include "zcash/util.h"
#include <algorithm>
#include <stdexcept>

std::vector<unsigned char> convertIntToVectorLE(const uint64_t val_int) {
    std::vector<unsigned char> bytes;

    for(size_t i = 0; i < 8; i++) {
        bytes.push_back(val_int >> (i * 8));
    }

    return bytes;
}

// Convert bytes into boolean vector. (MSB to LSB)
std::vector<bool> convertBytesVectorToVector(const std::vector<unsigned char>& bytes) {
    std::vector<bool> ret;
    ret.resize(bytes.size() * 8);

    unsigned char c;
    for (size_t i = 0; i < bytes.size(); i++) {
        c = bytes.at(i);
        for (size_t j = 0; j < 8; j++) {
            ret.at((i*8)+j) = (c >> (7-j)) & 1;
        }
    }

    return ret;
}

// Convert boolean vector (big endian) to integer
uint64_t convertVectorToInt(const std::vector<bool>& v) {
    if (v.size() > 64) {
        throw std::length_error ("boolean vector can't be larger than 64 bits");
    }

    uint64_t result = 0;
    for (size_t i=0; i<v.size();i++) {
        if (v.at(i)) {
            result |= (uint64_t)1 << ((v.size() - 1) - i);
        }
    }

    return result;
}