mirror of
https://github.com/ciphervance/supercell-wx.git
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62 lines
1.2 KiB
C++
62 lines
1.2 KiB
C++
#include <scwx/util/float.hpp>
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#include <cmath>
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#ifdef WIN32
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# include <WinSock2.h>
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#else
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# include <arpa/inet.h>
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#endif
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namespace scwx
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{
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namespace util
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{
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float DecodeFloat16(uint16_t hex)
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{
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static constexpr uint16_t S_MASK = 0x8000;
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static constexpr uint16_t S_LSB = 0;
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static constexpr uint16_t S_SHIFT = 15 - S_LSB;
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static constexpr uint16_t E_MASK = 0x7a00;
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static constexpr uint16_t E_LSB = 5;
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static constexpr uint16_t E_SHIFT = 15 - E_LSB;
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static constexpr uint16_t F_MASK = 0x03ff;
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static constexpr uint16_t F_LSB = 15;
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static constexpr uint16_t F_SHIFT = 15 - F_LSB;
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uint16_t sHex = (hex & S_MASK) >> S_SHIFT;
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uint16_t eHex = (hex & E_MASK) >> E_SHIFT;
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uint16_t fHex = (hex & F_MASK) >> F_SHIFT;
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float value;
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float s = std::pow(-1.0f, static_cast<float>(sHex));
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float e;
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float f;
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if (eHex == 0)
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{
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e = 2.0f;
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f = (fHex / std::pow(2.0f, 10.0f));
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}
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else
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{
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e = std::pow(2.0f, eHex - 16.0f);
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f = (1 + fHex / std::pow(2.0f, 10.0f));
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}
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value = s * e * f;
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return value;
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}
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float DecodeFloat32(uint16_t msw, uint16_t lsw)
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{
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uint32_t value = msw << 16 | lsw;
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return reinterpret_cast<float&>(value);
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}
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} // namespace util
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} // namespace scwx
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