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98 lines
2.1 KiB
C++
98 lines
2.1 KiB
C++
#pragma once
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#include <stdint.h>
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namespace PortabilityLayer
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{
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struct CombinedTimestamp
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{
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uint8_t m_macEpochTimestamp[8];
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uint8_t m_localYear[4];
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uint8_t m_localMonth;
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uint8_t m_localDay;
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uint8_t m_localHour;
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uint8_t m_localMinute;
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uint8_t m_localSecond;
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uint8_t m_padding[3];
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static const int32_t kMacEpochToUTC = 2082844800;
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int64_t GetMacEpochTime() const;
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void SetMacEpochTime(int64_t timestamp);
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int32_t GetLocalYear() const;
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void SetLocalYear(int32_t year);
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void GetAsMSDOSTimestamp(uint16_t &msdosDate, uint16_t &msdosTime) const;
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};
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inline int64_t CombinedTimestamp::GetMacEpochTime() const
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{
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int64_t result = 0;
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for (int i = 0; i < 8; i++)
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result |= static_cast<int64_t>(m_macEpochTimestamp[i]) << (i * 8);
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return result;
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}
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inline void CombinedTimestamp::SetMacEpochTime(int64_t timestamp)
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{
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for (int i = 0; i < 8; i++)
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m_macEpochTimestamp[i] = static_cast<uint8_t>((timestamp >> (i * 8)) & 0xff);
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}
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inline int32_t CombinedTimestamp::GetLocalYear() const
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{
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int32_t result = 0;
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for (int i = 0; i < 4; i++)
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result |= static_cast<int32_t>(m_localYear[i]) << (i * 8);
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return result;
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}
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inline void CombinedTimestamp::SetLocalYear(int32_t timestamp)
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{
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for (int i = 0; i < 4; i++)
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m_localYear[i] = static_cast<uint8_t>((timestamp >> (i * 8)) & 0xff);
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}
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inline void CombinedTimestamp::GetAsMSDOSTimestamp(uint16_t &msdosDate, uint16_t &msdosTime) const
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{
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int32_t localYear = this->GetLocalYear();
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uint8_t month = this->m_localMonth;
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uint8_t day = this->m_localDay;
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uint8_t hour = this->m_localHour;
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uint8_t minute = this->m_localMinute;
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uint8_t second = this->m_localSecond;
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int32_t yearsSince1980 = localYear - 1980;
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if (localYear < 1980)
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{
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// Time machine
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yearsSince1980 = 0;
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second = 0;
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minute = 0;
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hour = 0;
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day = 1;
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month = 1;
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}
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else if (localYear > 1980 + 127)
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{
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yearsSince1980 = 127;
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second = 59;
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minute = 59;
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hour = 23;
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day = 31;
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month = 12;
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}
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msdosTime = (second / 2) | (minute << 5) | (hour << 11);
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msdosDate = day | (month << 5) | (yearsSince1980 << 9);
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}
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}
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