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164 lines
7.7 KiB
C#
164 lines
7.7 KiB
C#
#region copyright
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//------------------------------------------------------------------------------
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// 此代码版权声明为全文件覆盖，如有原作者特别声明，会在下方手动补充
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// 此代码版权（除特别声明外的代码）归作者本人Diego所有
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// 源代码使用协议遵循本仓库的开源协议及附加协议
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// Gitee源代码仓库：https://gitee.com/diego2098/ThingsGateway
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// Github源代码仓库：https://github.com/kimdiego2098/ThingsGateway
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// 使用文档：https://diego2098.gitee.io/thingsgateway-docs/
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// QQ群：605534569
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//------------------------------------------------------------------------------
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#endregion
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namespace ThingsGateway.Foundation.Adapter.Siemens;
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/// <summary>
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/// https://github.com/S7NetPlus/s7netplus/blob/develop/S7.Net/Types/DateTime.cs
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/// Contains the methods to convert between <see cref="T:System.DateTime"/> and S7 representation of datetime values.
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/// </summary>
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public static class DateTime
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{
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/// <summary>
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/// The maximum <see cref="T:System.DateTime"/> value supported by the specification.
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/// </summary>
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public static readonly System.DateTime SpecMaximumDateTime = new(2089, 12, 31, 23, 59, 59, 999);
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/// <summary>
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/// The minimum <see cref="T:System.DateTime"/> value supported by the specification.
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/// </summary>
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public static readonly System.DateTime SpecMinimumDateTime = new(1990, 1, 1);
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/// <summary>
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/// Parses a <see cref="T:System.DateTime"/> value from bytes.
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/// </summary>
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/// <param name="bytes">Input bytes read from PLC.</param>
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/// <returns>A <see cref="T:System.DateTime"/> object representing the value read from PLC.</returns>
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/// <exception cref="ArgumentOutOfRangeException">Thrown when the length of
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/// <paramref name="bytes"/> is not 8 or any value in <paramref name="bytes"/>
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/// is outside the valid range of values.</exception>
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public static System.DateTime FromByteArray(byte[] bytes)
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{
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return FromByteArrayImpl(bytes);
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}
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/// <summary>
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/// Parses an array of <see cref="T:System.DateTime"/> values from bytes.
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/// </summary>
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/// <param name="bytes">Input bytes read from PLC.</param>
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/// <returns>An array of <see cref="T:System.DateTime"/> objects representing the values read from PLC.</returns>
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/// <exception cref="ArgumentOutOfRangeException">Thrown when the length of
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/// <paramref name="bytes"/> is not a multiple of 8 or any value in
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/// <paramref name="bytes"/> is outside the valid range of values.</exception>
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public static System.DateTime[] ToArray(byte[] bytes)
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{
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if (bytes.Length % 8 != 0)
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throw new ArgumentOutOfRangeException(nameof(bytes), bytes.Length,
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$"Parsing an array of DateTime requires a multiple of 8 bytes of input data, input data is '{bytes.Length}' long.");
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var cnt = bytes.Length / 8;
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var result = new System.DateTime[bytes.Length / 8];
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for (var i = 0; i < cnt; i++)
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result[i] = FromByteArrayImpl(new ArraySegment<byte>(bytes, i * 8, 8));
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return result;
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}
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/// <summary>
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/// Converts a <see cref="T:System.DateTime"/> value to a byte array.
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/// </summary>
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/// <param name="dateTime">The DateTime value to convert.</param>
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/// <returns>A byte array containing the S7 date time representation of <paramref name="dateTime"/>.</returns>
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/// <exception cref="ArgumentOutOfRangeException">Thrown when the value of
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/// <paramref name="dateTime"/> is before <see cref="P:SpecMinimumDateTime"/>
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/// or after <see cref="P:SpecMaximumDateTime"/>.</exception>
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public static byte[] ToByteArray(System.DateTime dateTime)
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{
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byte EncodeBcd(int value)
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{
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return (byte)((value / 10 << 4) | value % 10);
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}
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if (dateTime < SpecMinimumDateTime)
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throw new ArgumentOutOfRangeException(nameof(dateTime), dateTime,
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$"Date time '{dateTime}' is before the minimum '{SpecMinimumDateTime}' supported in S7 date time representation.");
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if (dateTime > SpecMaximumDateTime)
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throw new ArgumentOutOfRangeException(nameof(dateTime), dateTime,
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$"Date time '{dateTime}' is after the maximum '{SpecMaximumDateTime}' supported in S7 date time representation.");
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byte MapYear(int year) => (byte)(year < 2000 ? year - 1900 : year - 2000);
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int DayOfWeekToInt(DayOfWeek dayOfWeek) => (int)dayOfWeek + 1;
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return new[]
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{
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EncodeBcd(MapYear(dateTime.Year)),
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EncodeBcd(dateTime.Month),
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EncodeBcd(dateTime.Day),
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EncodeBcd(dateTime.Hour),
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EncodeBcd(dateTime.Minute),
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EncodeBcd(dateTime.Second),
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EncodeBcd(dateTime.Millisecond / 10),
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(byte) (dateTime.Millisecond % 10 << 4 | DayOfWeekToInt(dateTime.DayOfWeek))
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};
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}
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/// <summary>
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/// Converts an array of <see cref="T:System.DateTime"/> values to a byte array.
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/// </summary>
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/// <param name="dateTimes">The DateTime values to convert.</param>
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/// <returns>A byte array containing the S7 date time representations of <paramref name="dateTimes"/>.</returns>
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/// <exception cref="ArgumentOutOfRangeException">Thrown when any value of
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/// <paramref name="dateTimes"/> is before <see cref="P:SpecMinimumDateTime"/>
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/// or after <see cref="P:SpecMaximumDateTime"/>.</exception>
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public static byte[] ToByteArray(System.DateTime[] dateTimes)
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{
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var bytes = new List<byte>(dateTimes.Length * 8);
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foreach (var dateTime in dateTimes) bytes.AddRange(ToByteArray(dateTime));
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return bytes.ToArray();
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}
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private static System.DateTime FromByteArrayImpl(IList<byte> bytes)
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{
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if (bytes.Count != 8)
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throw new ArgumentOutOfRangeException(nameof(bytes), bytes.Count,
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$"Parsing a DateTime requires exactly 8 bytes of input data, input data is {bytes.Count} bytes long.");
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int DecodeBcd(byte input) => 10 * (input >> 4) + (input & 0b00001111);
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int ByteToYear(byte bcdYear)
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{
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var input = DecodeBcd(bcdYear);
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if (input < 90) return input + 2000;
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if (input < 100) return input + 1900;
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throw new ArgumentOutOfRangeException(nameof(bcdYear), bcdYear,
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$"Value '{input}' is higher than the maximum '99' of S7 date and time representation.");
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}
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int AssertRangeInclusive(int input, byte min, byte max, string field)
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{
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if (input < min)
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throw new ArgumentOutOfRangeException(nameof(input), input,
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$"Value '{input}' is lower than the minimum '{min}' allowed for {field}.");
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if (input > max)
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throw new ArgumentOutOfRangeException(nameof(input), input,
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$"Value '{input}' is higher than the maximum '{max}' allowed for {field}.");
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return input;
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}
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var year = ByteToYear(bytes[0]);
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var month = AssertRangeInclusive(DecodeBcd(bytes[1]), 1, 12, "month");
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var day = AssertRangeInclusive(DecodeBcd(bytes[2]), 1, 31, "day of month");
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var hour = AssertRangeInclusive(DecodeBcd(bytes[3]), 0, 23, "hour");
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var minute = AssertRangeInclusive(DecodeBcd(bytes[4]), 0, 59, "minute");
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var second = AssertRangeInclusive(DecodeBcd(bytes[5]), 0, 59, "second");
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var hsec = AssertRangeInclusive(DecodeBcd(bytes[6]), 0, 99, "first two millisecond digits");
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var msec = AssertRangeInclusive(bytes[7] >> 4, 0, 9, "third millisecond digit");
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_ = AssertRangeInclusive(bytes[7] & 0b00001111, 1, 7, "day of week");
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return new System.DateTime(year, month, day, hour, minute, second, hsec * 10 + msec);
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}
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} |