Justin Marshall
52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
#pragma once
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#include <algorithm>
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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#include <type_traits>
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class idSwap {
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public:
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template<typename type>
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static void Little(type&) {
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static_assert(!std::is_pointer<type>::value,
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"serialized pointers cannot be endian swapped");
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}
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template<typename type>
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static void Big(type& value) {
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static_assert(!std::is_pointer<type>::value,
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"serialized pointers cannot be endian swapped");
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unsigned char* bytes = reinterpret_cast<unsigned char*>(&value);
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std::reverse(bytes, bytes + sizeof(type));
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}
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template<typename type>
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static void LittleArray(type*, int) {
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}
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template<typename type>
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static void BigArray(type* values, const int count) {
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for (int index = 0; index < count; ++index) Big(values[index]);
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}
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static void SixtetsForInt(unsigned char* output, const int source) {
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const unsigned int value = static_cast<unsigned int>(source);
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output[0] = static_cast<unsigned char>((value >> 18) & 0x3F);
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output[1] = static_cast<unsigned char>((value >> 12) & 0x3F);
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output[2] = static_cast<unsigned char>((value >> 6) & 0x3F);
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output[3] = static_cast<unsigned char>(value & 0x3F);
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}
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static int IntForSixtets(const unsigned char* input) {
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return static_cast<int>((static_cast<unsigned int>(input[0]) << 18)
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| (static_cast<unsigned int>(input[1]) << 12)
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| (static_cast<unsigned int>(input[2]) << 6)
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| static_cast<unsigned int>(input[3]));
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}
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};
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static_assert(sizeof(idSwap) == 1, "Recovered idSwap must remain empty");
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