mirror of https://github.com/dahall/Vanara.git
123 lines
5.1 KiB
C#
123 lines
5.1 KiB
C#
using System.IO;
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namespace Vanara.RunTimeLib;
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/// <summary>Extension methods for CRT enumerations to convert to .NET enumerations.</summary>
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public static class ConstantConversionExtensions
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{
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/// <summary>Converts a <see cref="FileAttributeConstant"/> value to <see cref="FileAccess"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The result.</returns>
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public static FileAccess ToFileAccess(this FileAttributeConstant value)
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{
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// Note: This is not done in a switch because the order of tests matters.
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if ((FileAttributeConstant._A_RDONLY | FileAttributeConstant._A_NORMAL) == (value & (FileAttributeConstant._A_RDONLY | FileAttributeConstant._A_NORMAL)))
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return FileAccess.ReadWrite;
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else if (0 != (value & FileAttributeConstant._A_RDONLY))
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return FileAccess.Read;
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else if (0 != (value & FileAttributeConstant._A_NORMAL))
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return FileAccess.Write;
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else
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return FileAccess.Read;
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}
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/// <summary>Converts a <see cref="FilePermissionConstant"/> value to <see cref="FileAccess"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The result.</returns>
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public static FileAccess ToFileAccess(this FilePermissionConstant value)
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{
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// Note: This is not done in a switch because the order of tests matters.
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if ((value & (FilePermissionConstant._S_IWRITE | FilePermissionConstant._S_IREAD)) != 0)
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return FileAccess.ReadWrite;
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else if ((value & FilePermissionConstant._S_IWRITE) != 0)
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return FileAccess.Write;
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else
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return FileAccess.Read;
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}
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/// <summary>Converts a <see cref="FileAttributeConstant"/> value to <see cref="FileAttributes"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The result.</returns>
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public static FileAttributes ToFileAttributes(this FileAttributeConstant value)
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{
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FileAttributes ret = 0;
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if ((value & FileAttributeConstant._A_SUBDIR) != 0)
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ret |= FileAttributes.Directory;
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if ((value & FileAttributeConstant._A_RDONLY) != 0)
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ret |= FileAttributes.ReadOnly;
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if ((value & FileAttributeConstant._A_HIDDEN) != 0)
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ret |= FileAttributes.Hidden;
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if ((value & FileAttributeConstant._A_SYSTEM) != 0)
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ret |= FileAttributes.System;
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if ((value & FileAttributeConstant._A_ARCH) != 0)
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ret |= FileAttributes.Archive;
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return ret;
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}
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/// <summary>Converts a <see cref="FileOpConstant"/> value to <see cref="FileMode"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The result.</returns>
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public static FileMode ToFileMode(this FileOpConstant value)
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{
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// Note: This is not done in a switch because the order of tests matters.
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if ((FileOpConstant._O_CREAT | FileOpConstant._O_EXCL) == (value & (FileOpConstant._O_CREAT | FileOpConstant._O_EXCL)))
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return FileMode.CreateNew;
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else if ((FileOpConstant._O_CREAT | FileOpConstant._O_TRUNC) == (value & (FileOpConstant._O_CREAT | FileOpConstant._O_TRUNC)))
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return FileMode.OpenOrCreate;
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else if (0 != (value & FileOpConstant._O_APPEND))
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return FileMode.Append;
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else if (0 != (value & FileOpConstant._O_CREAT))
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return FileMode.Create;
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else if (0 != (value & FileOpConstant._O_RDWR))
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return FileMode.Open;
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else if (0 != (value & FileOpConstant._O_TRUNC))
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return FileMode.Truncate;
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else
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return FileMode.OpenOrCreate; // This seemed the safest way to handled unrecognized types
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}
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/// <summary>Converts a <see cref="FileOpConstant"/> value to <see cref="FileOptions"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The result.</returns>
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public static FileOptions ToFileOptions(this FileOpConstant value)
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{
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FileOptions ret = 0;
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if ((value & FileOpConstant._O_RANDOM) != 0)
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ret |= FileOptions.RandomAccess;
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if ((value & FileOpConstant._O_TEMPORARY) != 0)
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ret |= FileOptions.DeleteOnClose;
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if ((value & FileOpConstant._O_SEQUENTIAL) != 0)
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ret |= FileOptions.SequentialScan;
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return ret;
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}
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/// <summary>Converts a <see cref="FileAttributeConstant"/> value to <see cref="FileShare"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The result.</returns>
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public static FileShare ToFileShare(this FileAttributeConstant value)
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{
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// Note: This is not done in a switch because the order of tests matters.
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if ((FileAttributeConstant._A_RDONLY | FileAttributeConstant._A_NORMAL) == (value & (FileAttributeConstant._A_RDONLY | FileAttributeConstant._A_NORMAL)))
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return FileShare.ReadWrite;
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else if (0 != (value & FileAttributeConstant._A_RDONLY))
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return FileShare.Read;
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else if (0 != (value & FileAttributeConstant._A_NORMAL))
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return FileShare.Write;
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else
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return FileShare.Read;
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}
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/// <summary>Converts a <see cref="FilePermissionConstant"/> value to <see cref="FileShare"/>.</summary>
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/// <param name="value">The value.</param>
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/// <returns>The result.</returns>
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public static FileShare ToFileShare(this FilePermissionConstant value)
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{
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// Note: This is not done in a switch because the order of tests matters.
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if ((value & (FilePermissionConstant._S_IWRITE | FilePermissionConstant._S_IREAD)) != 0)
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return FileShare.ReadWrite;
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else if ((value & FilePermissionConstant._S_IWRITE) != 0)
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return FileShare.Write;
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else
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return FileShare.Read;
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}
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} |