mirror of
https://github.com/mfontanini/libtins
synced 2026-01-23 02:35:57 +01:00
96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
/*
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* libtins is a net packet wrapper library for crafting and
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* interpreting sniffed packets.
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*
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* Copyright (C) 2011 Nasel
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef TINS_SMALL_UINT_H
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#define TINS_SMALL_UINT_H
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#include <stdint.h>
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#include <stdexcept>
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namespace Tins {
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template<size_t n>
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class small_uint {
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private:
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template<bool cond, typename OnTrue, typename OnFalse>
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struct if_then_else {
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typedef OnTrue type;
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};
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template<typename OnTrue, typename OnFalse>
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struct if_then_else<false, OnTrue, OnFalse> {
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typedef OnFalse type;
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};
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template<size_t i>
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struct best_type {
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typedef typename if_then_else<
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(i <= 8),
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uint8_t,
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typename if_then_else<
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(i <= 16),
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uint16_t,
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typename if_then_else<
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(i <= 32),
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uint32_t,
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uint64_t
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>::type
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>::type
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>::type type;
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};
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template<uint64_t base, uint64_t pow>
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struct power {
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static const uint64_t value = base * power<base, pow - 1>::value;
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};
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template<uint64_t base>
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struct power<base, 0> {
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static const uint64_t value = 1;
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};
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public:
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class value_to_large : public std::exception {
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public:
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const char *what() const throw() {
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return "Value is too large";
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}
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};
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typedef typename best_type<n>::type repr_type;
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static const repr_type max_value = power<2, n>::value - 1;
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small_uint() : value() {}
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small_uint(repr_type val) {
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if(val > max_value)
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throw value_to_large();
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value = val;
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}
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operator repr_type() const {
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return value;
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}
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private:
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repr_type value;
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};
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} // namespace Tins
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#endif // TINS_SMALL_UINT_H
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