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Diffstat (limited to 'src/mscorlib/corefx/System/IO/PathInternal.Unix.cs')
-rw-r--r-- | src/mscorlib/corefx/System/IO/PathInternal.Unix.cs | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/mscorlib/corefx/System/IO/PathInternal.Unix.cs b/src/mscorlib/corefx/System/IO/PathInternal.Unix.cs new file mode 100644 index 0000000000..6c39f99556 --- /dev/null +++ b/src/mscorlib/corefx/System/IO/PathInternal.Unix.cs @@ -0,0 +1,122 @@ +// Licensed to the .NET Foundation under one or more agreements. +// The .NET Foundation licenses this file to you under the MIT license. +// See the LICENSE file in the project root for more information. + +using System.Diagnostics; +using System.Text; + +namespace System.IO +{ + /// <summary>Contains internal path helpers that are shared between many projects.</summary> + internal static partial class PathInternal + { + // There is only one invalid path character in Unix + private const char InvalidPathChar = '\0'; + internal static char[] GetInvalidPathChars() => new char[] { InvalidPathChar }; + + internal static readonly int MaxComponentLength = Interop.Sys.MaxName; + + internal const string ParentDirectoryPrefix = @"../"; + + /// <summary>Returns a value indicating if the given path contains invalid characters.</summary> + internal static bool HasIllegalCharacters(string path) + { + Debug.Assert(path != null); + return path.IndexOf(InvalidPathChar) >= 0; + } + + internal static int GetRootLength(string path) + { + return path.Length > 0 && IsDirectorySeparator(path[0]) ? 1 : 0; + } + + internal static bool IsDirectorySeparator(char c) + { + // The alternate directory separator char is the same as the directory separator, + // so we only need to check one. + Debug.Assert(Path.DirectorySeparatorChar == Path.AltDirectorySeparatorChar); + return c == Path.DirectorySeparatorChar; + } + + /// <summary> + /// Returns true if the path is too long + /// </summary> + internal static bool IsPathTooLong(string fullPath) + { + return fullPath.Length >= Interop.Sys.MaxPath; + } + + /// <summary> + /// Returns true if the directory is too long + /// </summary> + internal static bool IsDirectoryTooLong(string fullPath) + { + return fullPath.Length >= Interop.Sys.MaxPath; + } + + /// <summary> + /// Normalize separators in the given path. Compresses forward slash runs. + /// </summary> + internal static string NormalizeDirectorySeparators(string path) + { + if (string.IsNullOrEmpty(path)) return path; + + // Make a pass to see if we need to normalize so we can potentially skip allocating + bool normalized = true; + + for (int i = 0; i < path.Length; i++) + { + if (IsDirectorySeparator(path[i]) + && (i + 1 < path.Length && IsDirectorySeparator(path[i + 1]))) + { + normalized = false; + break; + } + } + + if (normalized) return path; + + StringBuilder builder = new StringBuilder(path.Length); + + for (int i = 0; i < path.Length; i++) + { + char current = path[i]; + + // Skip if we have another separator following + if (IsDirectorySeparator(current) + && (i + 1 < path.Length && IsDirectorySeparator(path[i + 1]))) + continue; + + builder.Append(current); + } + + return builder.ToString(); + } + + /// <summary> + /// Returns true if the character is a directory or volume separator. + /// </summary> + /// <param name="ch">The character to test.</param> + internal static bool IsDirectoryOrVolumeSeparator(char ch) + { + // The directory separator, volume separator, and the alternate directory + // separator should be the same on Unix, so we only need to check one. + Debug.Assert(Path.DirectorySeparatorChar == Path.AltDirectorySeparatorChar); + Debug.Assert(Path.DirectorySeparatorChar == Path.VolumeSeparatorChar); + return ch == Path.DirectorySeparatorChar; + } + + internal static bool HasInvalidVolumeSeparator(string path) + { + // This is only ever true for Windows + return false; + } + + internal static bool IsPartiallyQualified(string path) + { + // This is much simpler than Windows where paths can be rooted, but not fully qualified (such as Drive Relative) + // As long as the path is rooted in Unix it doesn't use the current directory and therefore is fully qualified. + return !Path.IsPathRooted(path); + } + } +} |