univalue_get.cpp

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// Copyright 2014 BitPay Inc.
// Copyright 2015 Bitcoin Core Developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or https://opensource.org/licenses/mit-license.php.
 
#include <univalue.h>
 
#include <cerrno>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <limits>
#include <locale>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
 
namespace {
static bool ParsePrechecks(const std::string &str) {
    if (str.empty()) {
        // No empty string allowed
        return false;
    }
    if (str.size() >= 1 &&
        (json_isspace(str[0]) || json_isspace(str[str.size() - 1]))) {
        // No padding allowed
        return false;
    }
    if (str.size() != strlen(str.c_str())) {
        // No embedded NUL characters allowed
        return false;
    }
    return true;
}
 
bool ParseDouble(const std::string &str, double *out) {
    if (!ParsePrechecks(str)) {
        return false;
    }
    if (str.size() >= 2 && str[0] == '0' && str[1] == 'x') {
        // No hexadecimal floats allowed
        return false;
    }
    std::istringstream text(str);
    text.imbue(std::locale::classic());
    double result;
    text >> result;
    if (out) {
        *out = result;
    }
    return text.eof() && !text.fail();
}
} // namespace
 
const std::vector<std::string> &UniValue::getKeys() const {
    checkType(VOBJ);
    return keys;
}
 
const std::vector<UniValue> &UniValue::getValues() const {
    if (typ != VOBJ && typ != VARR) {
        throw std::runtime_error(
            "JSON value is not an object or array as expected");
    }
    return values;
}
 
bool UniValue::get_bool() const {
    checkType(VBOOL);
    return isTrue();
}
 
const std::string &UniValue::get_str() const {
    checkType(VSTR);
    return getValStr();
}
 
double UniValue::get_real() const {
    checkType(VNUM);
    double retval;
    if (!ParseDouble(getValStr(), &retval)) {
        throw std::runtime_error("JSON double out of range");
    }
    return retval;
}
 
const UniValue &UniValue::get_obj() const {
    checkType(VOBJ);
    return *this;
}
 
const UniValue &UniValue::get_array() const {
    checkType(VARR);
    return *this;
}