uint256.cpp

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2017 The Fabcoin 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 <utilstrencodings.h>

#include <stdio.h>
#include <string.h>

template <unsigned int BITS>
base_blob<BITS>::base_blob(const std::vector<unsigned char>& vch)
{
    assert(vch.size() == sizeof(data));
    memcpy(data, &vch[0], sizeof(data));
}

template <unsigned int BITS>
std::string base_blob<BITS>::GetHex() const
{
    return HexStr(std::reverse_iterator<const uint8_t*>(data + sizeof(data)), std::reverse_iterator<const uint8_t*>(data));
}

template <unsigned int BITS>
std::string base_blob<BITS>::GetReverseHex() const
{
    char psz[sizeof(data) * 2 + 1];
    int j=0;
    for (int i = sizeof(data)-1; i >= 0; i--) {
        sprintf(psz + j * 2, "%02x", data[sizeof(data) - i - 1]);
        j++;
    }
    return std::string(psz, psz + sizeof(data) * 2);
}

template <unsigned int BITS>
void base_blob<BITS>::SetHex(const char* psz)
{
    memset(data, 0, sizeof(data));

    // skip leading spaces
    while (isspace(*psz))
        psz++;

    // skip 0x
    if (psz[0] == '0' && tolower(psz[1]) == 'x')
        psz += 2;

    // hex string to uint
    const char* pbegin = psz;
    while (::HexDigit(*psz) != -1)
        psz++;
    psz--;
    unsigned char* p1 = (unsigned char*)data;
    unsigned char* pend = p1 + WIDTH;
    while (psz >= pbegin && p1 < pend) {
        *p1 = ::HexDigit(*psz--);
        if (psz >= pbegin) {
            *p1 |= ((unsigned char)::HexDigit(*psz--) << 4);
            p1++;
        }
    }
}

template <unsigned int BITS>
void base_blob<BITS>::SetHex(const std::string& str)
{
    SetHex(str.c_str());
}

template <unsigned int BITS>
void base_blob<BITS>::SetReverseHex(const char* psz)
{
    SetHex(psz);
    //reverse in-place
    int left = 0;
    int right = size()-1;
    unsigned char* p1 = (unsigned char*)data;
    while(left < right){
        int temp=p1[left];
        p1[left++] = p1[right];
        p1[right--] = temp;
    }
}

template <unsigned int BITS>
void base_blob<BITS>::SetReverseHex(const std::string& str)
{
    SetReverseHex(str.c_str());
}

template <unsigned int BITS>
std::string base_blob<BITS>::ToString() const
{
    return (GetHex());
}

// Explicit instantiations for base_blob<160>
template base_blob<160>::base_blob(const std::vector<unsigned char>&);
template std::string base_blob<160>::GetHex() const;
template std::string base_blob<160>::ToString() const;
template void base_blob<160>::SetHex(const char*);
template void base_blob<160>::SetHex(const std::string&);
template std::string base_blob<160>::GetReverseHex() const;
template void base_blob<160>::SetReverseHex(const char*);
template void base_blob<160>::SetReverseHex(const std::string&);

// Explicit instantiations for base_blob<256>
template base_blob<256>::base_blob(const std::vector<unsigned char>&);
template std::string base_blob<256>::GetHex() const;
template std::string base_blob<256>::ToString() const;
template void base_blob<256>::SetHex(const char*);
template void base_blob<256>::SetHex(const std::string&);
template std::string base_blob<256>::GetReverseHex() const;
template void base_blob<256>::SetReverseHex(const char*);
template void base_blob<256>::SetReverseHex(const std::string&);