コード例 #1
0
ファイル: Block.cpp プロジェクト: dioptre/libcoin
int Block::getHeight() const {
    Script coinbase = getTransaction(0).getInput(0).signature();
    Script::const_iterator cbi = coinbase.begin();
    opcodetype opcode;
    std::vector<unsigned char> data;
    // We simply ignore the first opcode and data, however, it is the height...
    coinbase.getOp(cbi, opcode, data);
    if (opcode < OP_PUSHDATA1) {
        CBigNum height;
        height.setvch(data);
        int h = height.getint();
        return h;
    }
    return 0;
}
コード例 #2
0
ファイル: Address.cpp プロジェクト: dianna-project/libcoin
inline string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend)
{
    CAutoBN_CTX pctx;
    CBigNum bn58 = 58;
    CBigNum bn0 = 0;
    
    // Convert big endian data to little endian
    // Extra zero at the end make sure bignum will interpret as a positive number
    vector<unsigned char> vchTmp(pend-pbegin+1, 0);
    reverse_copy(pbegin, pend, vchTmp.begin());
    
    // Convert little endian data to bignum
    CBigNum bn;
    bn.setvch(vchTmp);
    
    // Convert bignum to string
    string str;
    // Expected size increase from base58 conversion is approximately 137%
    // use 138% to be safe
    str.reserve((pend - pbegin) * 138 / 100 + 1);
    CBigNum dv;
    CBigNum rem;
    while (bn > bn0)
        {
        if (!BN_div(&dv, &rem, &bn, &bn58, pctx))
            throw bignum_error("EncodeBase58 : BN_div failed");
        bn = dv;
        unsigned int c = rem.getulong();
        str += pszBase58[c];
        }
    
    // Leading zeroes encoded as base58 zeros
    for (const unsigned char* p = pbegin; p < pend && *p == 0; p++)
        str += pszBase58[0];
    
    // Convert little endian string to big endian
    reverse(str.begin(), str.end());
    return str;
}