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170 lines
6.8 KiB
170 lines
6.8 KiB
// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the Andrey N. Sabelnikov nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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#pragma once
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#include "misc_language.h"
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#include "portable_storage_base.h"
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#include "warnings.h"
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namespace epee
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{
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namespace serialization
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{
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#define ASSERT_AND_THROW_WRONG_CONVERSION() ASSERT_MES_AND_THROW("WRONG DATA CONVERSION: from type=" << typeid(from).name() << " to type " << typeid(to).name())
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template<typename from_type, typename to_type>
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void convert_int_to_uint(const from_type& from, to_type& to)
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{
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PUSH_WARNINGS
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DISABLE_VS_WARNINGS(4018)
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CHECK_AND_ASSERT_THROW_MES(from >=0, "unexpected int value with signed storage value less than 0, and unsigned receiver value");
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DISABLE_GCC_AND_CLANG_WARNING(sign-compare)
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CHECK_AND_ASSERT_THROW_MES(from <= std::numeric_limits<to_type>::max(), "int value overhead: try to set value " << from << " to type " << typeid(to_type).name() << " with max possible value = " << std::numeric_limits<to_type>::max());
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to = static_cast<to_type>(from);
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POP_WARNINGS
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}
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template<typename from_type, typename to_type>
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void convert_int_to_int(const from_type& from, to_type& to)
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{
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CHECK_AND_ASSERT_THROW_MES(from >= boost::numeric::bounds<to_type>::lowest(), "int value overhead: try to set value " << from << " to type " << typeid(to_type).name() << " with lowest possible value = " << boost::numeric::bounds<to_type>::lowest());
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PUSH_WARNINGS
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DISABLE_CLANG_WARNING(tautological-constant-out-of-range-compare)
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CHECK_AND_ASSERT_THROW_MES(from <= std::numeric_limits<to_type>::max(), "int value overhead: try to set value " << from << " to type " << typeid(to_type).name() << " with max possible value = " << std::numeric_limits<to_type>::max());
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POP_WARNINGS
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to = static_cast<to_type>(from);
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}
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template<typename from_type, typename to_type>
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void convert_uint_to_any_int(const from_type& from, to_type& to)
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{
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PUSH_WARNINGS
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DISABLE_VS_WARNINGS(4018)
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DISABLE_CLANG_WARNING(tautological-constant-out-of-range-compare)
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CHECK_AND_ASSERT_THROW_MES(from <= std::numeric_limits<to_type>::max(), "uint value overhead: try to set value " << from << " to type " << typeid(to_type).name() << " with max possible value = " << std::numeric_limits<to_type>::max());
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to = static_cast<to_type>(from);
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POP_WARNINGS
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}
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template<typename from_type, typename to_type, bool, bool> //is from signed, is from to signed
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struct convert_to_signed_unsigned;
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template<typename from_type, typename to_type>
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struct convert_to_signed_unsigned<from_type, to_type, true, true>
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{
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static void convert(const from_type& from, to_type& to)
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{//from signed to signed
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convert_int_to_int(from, to);
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}
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};
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template<typename from_type, typename to_type>
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struct convert_to_signed_unsigned<from_type, to_type, true, false>
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{
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static void convert(const from_type& from, to_type& to)
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{//from signed to unsigned
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convert_int_to_uint(from, to);
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}
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};
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template<typename from_type, typename to_type>
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struct convert_to_signed_unsigned<from_type, to_type, false, true>
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{
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static void convert(const from_type& from, to_type& to)
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{//from unsigned to signed
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convert_uint_to_any_int(from, to);
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}
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};
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template<typename from_type, typename to_type>
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struct convert_to_signed_unsigned<from_type, to_type, false, false>
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{
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static void convert(const from_type& from, to_type& to)
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{
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//from unsigned to unsigned
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convert_uint_to_any_int(from, to);
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}
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};
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template<typename from_type, typename to_type, bool>
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struct convert_to_integral;
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template<typename from_type, typename to_type>
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struct convert_to_integral<from_type, to_type, true>
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{
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static void convert(const from_type& from, to_type& to)
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{
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convert_to_signed_unsigned<from_type, to_type, std::is_signed<from_type>::value, std::is_signed<to_type>::value>::convert(from, to);
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}
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};
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template<typename from_type, typename to_type>
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struct convert_to_integral<from_type, to_type, false>
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{
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static void convert(const from_type& from, to_type& to)
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{
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ASSERT_AND_THROW_WRONG_CONVERSION();
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}
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};
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template<class from_type, class to_type>
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struct is_convertable: std::integral_constant<bool,
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std::is_integral<to_type>::value &&
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std::is_integral<from_type>::value &&
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!std::is_same<from_type, bool>::value &&
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!std::is_same<to_type, bool>::value > {};
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template<typename from_type, typename to_type, bool>
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struct convert_to_same;
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template<typename from_type, typename to_type>
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struct convert_to_same<from_type, to_type, true>
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{
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static void convert(const from_type& from, to_type& to)
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{
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to = from;
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}
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};
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template<typename from_type, typename to_type>
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struct convert_to_same<from_type, to_type, false>
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{
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static void convert(const from_type& from, to_type& to)
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{
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convert_to_integral<from_type, to_type, is_convertable<from_type, to_type>::value>::convert(from, to);// ASSERT_AND_THROW_WRONG_CONVERSION();
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}
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};
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template<class from_type, class to_type>
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void convert_t(const from_type& from, to_type& to)
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{
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convert_to_same<from_type, to_type, std::is_same<to_type, from_type>::value>::convert(from, to);
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}
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}
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}
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