n2hexstr.hh

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/*
 * Copyright 2021 Assured Information Security, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <string>
 
namespace introvirt {
 
template <typename I>
std::string n2hexstr(I w, size_t hex_len = sizeof(I) << 1) {
    static const char* digits = "0123456789ABCDEF";
    std::string rc(hex_len + 2, '0');
    rc[1] = 'x';
    for (size_t i = 0, j = (hex_len - 1) * 4; i < hex_len; ++i, j -= 4)
        rc[i + 2] = digits[(w >> j) & 0x0f];
    return rc;
}
 
} // namespace introvirt