mirror of https://github.com/dahall/Vanara.git
Added time_t class with conversion support to/from DateTime
dahall
parent
131d4db65a
commit
5dd910e41c
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using System;
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using System.ComponentModel;
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using System.Globalization;
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using System.Runtime.InteropServices;
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namespace Vanara.PInvoke
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{
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/// <summary>Managed instance of the time_t type.</summary>
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[StructLayout(LayoutKind.Sequential), Serializable]
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[TypeConverter(typeof(time_tTypeConverter))]
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#pragma warning disable IDE1006 // Naming Styles
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public struct time_t : IEquatable<time_t>, IComparable<time_t>, IEquatable<DateTime>, IComparable<DateTime>, IConvertible, IComparable
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#pragma warning restore IDE1006 // Naming Styles
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{
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private static readonly DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Local);
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private readonly long val;
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/// <summary>Initializes a new instance of the <see cref="time_t"/> struct.</summary>
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/// <param name="ticks">
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/// The number of seconds since the start of the epoch: midnight UTC of January 1, 1970 (not counting leap seconds).
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/// </param>
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public time_t(long ticks) => val = ticks;
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/// <summary>Initializes a new instance of the <see cref="time_t"/> struct.</summary>
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/// <param name="dateTime">The date.</param>
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public time_t(DateTime dateTime) => val = (long)(dateTime.ToLocalTime() - epoch).TotalSeconds;
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/// <summary>
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/// Represents the largest possible value of <see cref="time_t"/>. This property is determined by the maximum bit-size of a pointer.
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/// </summary>
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public static readonly time_t MaxValue = (time_t)long.MaxValue;
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/// <summary>Represents the smallest possible value of <see cref="time_t"/>. This field is constant.</summary>
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public static readonly time_t MinValue = (time_t)long.MinValue;
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/// <summary>Represents the zero value of <see cref="time_t"/>. This field is constant.</summary>
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public static readonly time_t Zero = default;
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/// <summary>Gets the value.</summary>
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/// <value>The value.</value>
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public DateTime Value => epoch.AddSeconds(val);
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/// <summary>Performs an explicit conversion from <see cref="System.Int64"/> to <see cref="time_t"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The result of the conversion.</returns>
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public static explicit operator time_t(long value) => new time_t(value);
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/// <summary>Performs an explicit conversion from <see cref="time_t"/> to <see cref="System.Int64"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The result of the conversion.</returns>
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public static explicit operator long(time_t value) => value.val;
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/// <summary>Performs an implicit conversion from <see cref="DateTime"/> to <see cref="time_t"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The resulting <see cref="time_t"/> instance from the conversion.</returns>
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public static implicit operator time_t(DateTime value) => new time_t(value);
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/// <summary>Performs an implicit conversion from <see cref="time_t"/> to <see cref="DateTime"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The resulting <see cref="DateTime"/> instance from the conversion.</returns>
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public static implicit operator DateTime(time_t value) => value.Value;
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/// <summary>Indicates whether two <see cref="time_t"/> instances are not equal.</summary>
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/// <param name="s1">The first integral size to compare.</param>
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/// <param name="s2">The second integral size to compare.</param>
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/// <returns>
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/// <see langword="true"/> if the value of <paramref name="s1"/> is not equal to the value of <paramref name="s2"/>; otherwise, <see langword="false"/>.
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/// </returns>
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public static bool operator !=(time_t s1, time_t s2) => !s1.Equals(s2);
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/// <summary>Indicates whether a specified <see cref="time_t"/> is less than another specified <see cref="time_t"/>.</summary>
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/// <param name="s1">The first integral size to compare.</param>
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/// <param name="s2">The second integral size to compare.</param>
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/// <returns>
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/// <see langword="true"/> if the value of <paramref name="s1"/> is less than the value of <paramref name="s2"/>; otherwise, <see langword="false"/>.
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/// </returns>
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public static bool operator <(time_t s1, time_t s2) => (s1.CompareTo(s2) < 0);
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/// <summary>Indicates whether a specified <see cref="time_t"/> is less than or equal to another specified <see cref="time_t"/>.</summary>
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/// <param name="s1">The first integral size to compare.</param>
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/// <param name="s2">The second integral size to compare.</param>
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/// <returns>
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/// <see langword="true"/> if the value of <paramref name="s1"/> is less than or equal to the value of <paramref name="s2"/>;
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/// otherwise, <see langword="false"/>.
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/// </returns>
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public static bool operator <=(time_t s1, time_t s2) => (s1.CompareTo(s2) <= 0);
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/// <summary>Indicates whether two <see cref="time_t"/> instances are equal.</summary>
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/// <param name="s1">The first integral size to compare.</param>
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/// <param name="s2">The second integral size to compare.</param>
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/// <returns>
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/// <see langword="true"/> if the value of <paramref name="s1"/> is equal to the value of <paramref name="s2"/>; otherwise, <see langword="false"/>.
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/// </returns>
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public static bool operator ==(time_t s1, time_t s2) => s1.Equals(s2);
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/// <summary>Indicates whether a specified <see cref="time_t"/> is greater than another specified <see cref="time_t"/>.</summary>
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/// <param name="s1">The first integral size to compare.</param>
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/// <param name="s2">The second integral size to compare.</param>
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/// <returns>
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/// <see langword="true"/> if the value of <paramref name="s1"/> is greater than the value of <paramref name="s2"/>; otherwise, <see langword="false"/>.
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/// </returns>
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public static bool operator >(time_t s1, time_t s2) => (s1.CompareTo(s2) > 0);
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/// <summary>Indicates whether a specified <see cref="time_t"/> is greater than or equal to another specified <see cref="time_t"/>.</summary>
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/// <param name="s1">The first integral size to compare.</param>
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/// <param name="s2">The second integral size to compare.</param>
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/// <returns>
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/// <see langword="true"/> if the value of <paramref name="s1"/> is greater than or equal to the value of <paramref name="s2"/>;
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/// otherwise, <see langword="false"/>.
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/// </returns>
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public static bool operator >=(time_t s1, time_t s2) => (s1.CompareTo(s2) >= 0);
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/// <inheritdoc/>
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public int CompareTo(time_t other) => val.CompareTo(other.val);
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/// <inheritdoc/>
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public int CompareTo(DateTime other) => Value.CompareTo(other);
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/// <inheritdoc/>
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public override bool Equals(object obj) => obj is time_t s ? Equals(s) : Value.Equals(obj);
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/// <inheritdoc/>
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public bool Equals(time_t other) => val.Equals(other.val);
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/// <inheritdoc/>
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public bool Equals(DateTime other) => Value.Equals(other);
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/// <inheritdoc/>
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public override int GetHashCode() => val.GetHashCode();
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/// <inheritdoc/>
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public TypeCode GetTypeCode() => val.GetTypeCode();
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/// <inheritdoc/>
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public override string ToString() => ToString(null);
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/// <inheritdoc/>
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public string ToString(IFormatProvider provider) => Value.ToString(provider);
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/// <inheritdoc/>
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int IComparable.CompareTo(object obj) => Value.CompareTo(Convert.ChangeType(obj, typeof(DateTime)));
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/// <inheritdoc/>
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bool IConvertible.ToBoolean(IFormatProvider provider) => ((IConvertible)Value).ToBoolean(provider);
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/// <inheritdoc/>
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byte IConvertible.ToByte(IFormatProvider provider) => ((IConvertible)Value).ToByte(provider);
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/// <inheritdoc/>
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char IConvertible.ToChar(IFormatProvider provider) => ((IConvertible)Value).ToChar(provider);
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/// <inheritdoc/>
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DateTime IConvertible.ToDateTime(IFormatProvider provider) => Value;
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/// <inheritdoc/>
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decimal IConvertible.ToDecimal(IFormatProvider provider) => ((IConvertible)Value).ToDecimal(provider);
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/// <inheritdoc/>
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double IConvertible.ToDouble(IFormatProvider provider) => ((IConvertible)Value).ToDouble(provider);
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/// <inheritdoc/>
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short IConvertible.ToInt16(IFormatProvider provider) => ((IConvertible)Value).ToInt16(provider);
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/// <inheritdoc/>
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int IConvertible.ToInt32(IFormatProvider provider) => ((IConvertible)Value).ToInt32(provider);
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/// <inheritdoc/>
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long IConvertible.ToInt64(IFormatProvider provider) => ((IConvertible)Value).ToInt64(provider);
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/// <inheritdoc/>
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sbyte IConvertible.ToSByte(IFormatProvider provider) => ((IConvertible)Value).ToSByte(provider);
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/// <inheritdoc/>
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float IConvertible.ToSingle(IFormatProvider provider) => ((IConvertible)Value).ToSingle(provider);
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/// <inheritdoc/>
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object IConvertible.ToType(Type conversionType, IFormatProvider provider) => ((IConvertible)Value).ToType(conversionType, provider);
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/// <inheritdoc/>
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ushort IConvertible.ToUInt16(IFormatProvider provider) => ((IConvertible)Value).ToUInt16(provider);
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/// <inheritdoc/>
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uint IConvertible.ToUInt32(IFormatProvider provider) => ((IConvertible)Value).ToUInt32(provider);
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/// <inheritdoc/>
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ulong IConvertible.ToUInt64(IFormatProvider provider) => ((IConvertible)Value).ToUInt64(provider);
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#pragma warning disable IDE1006 // Naming Styles
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internal class time_tTypeConverter : DateTimeConverter
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#pragma warning restore IDE1006 // Naming Styles
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{
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public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
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{
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if (value is not time_t sz) throw new ArgumentException();
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return base.ConvertTo(context, culture, sz.Value, destinationType);
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}
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public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) =>
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new time_t((DateTime)base.ConvertFrom(context, culture, value));
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}
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}
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}
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