uint256.cpp

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include <uint256.h>
 
#include <util/strencodings.h>
 
template <unsigned int BITS> std::string base_blob<BITS>::GetHex() const {
    uint8_t m_data_rev[WIDTH];
    for (int i = 0; i < WIDTH; ++i) {
        m_data_rev[i] = m_data[WIDTH - 1 - i];
    }
    return HexStr(m_data_rev);
}
 
template <unsigned int BITS>
void base_blob<BITS>::SetHexDeprecated(const std::string_view str) {
    std::fill(m_data.begin(), m_data.end(), 0);
 
    const auto trimmed =
        util::RemovePrefixView(util::TrimStringView(str), "0x");
 
    // Note: if we are passed a greater number of digits than would fit as bytes
    // in m_data, we will be discarding the leftmost ones.
    // str="12bc" in a WIDTH=1 m_data => m_data[] == "\0xbc", not "0x12".
 
    size_t digits = 0;
    for (const char c : trimmed) {
        if (::HexDigit(c) == -1) {
            break;
        }
        ++digits;
    }
 
    uint8_t *p1 = m_data.data();
    uint8_t *pend = p1 + WIDTH;
    while (digits > 0 && p1 < pend) {
        *p1 = ::HexDigit(trimmed[--digits]);
        if (digits > 0) {
            *p1 |= uint8_t(::HexDigit(trimmed[--digits])) << 4;
            p1++;
        }
    }
}
 
// Explicit instantiations for base_blob<160>
template std::string base_blob<160>::GetHex() const;
template std::string base_blob<160>::ToString() const;
template void base_blob<160>::SetHexDeprecated(std::string_view);
 
// Explicit instantiations for base_blob<256>
template std::string base_blob<256>::GetHex() const;
template std::string base_blob<256>::ToString() const;
template void base_blob<256>::SetHexDeprecated(std::string_view);
 
const uint256 uint256::ZERO(0);
const uint256 uint256::ONE(1);