Implemented Mac OS X getxattr(2), setxattr(2), removexattr(2)

and listxattr(2).

Claunia.IO/ChangeLog

@@ -1,3 +1,10 @@
+2015-04-25  Natalia Portillo  <claunia@claunia.com>
+
+	* Claunia.IO.csproj:
+	* Interop/Apple/Interop.Apple.xattr.cs:
+	  Implemented Mac OS X getxattr(2), setxattr(2),
+	  removexattr(2) and listxattr(2).
+
 2015-04-25  Natalia Portillo  <claunia@claunia.com>
 
 	* Interop/Apple/Interop.Apple.getattrlist.cs:

Claunia.IO/Claunia.IO.csproj

@@ -54,6 +54,7 @@
     <Compile Include="Interop\Linux\Interop.Linux.uname.cs" />
     <Compile Include="Tests\Interop.Linux.cs" />
     <Compile Include="Interop\Apple\Interop.Apple.getattrlist.cs" />
+    <Compile Include="Interop\Apple\Interop.Apple.xattr.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

Claunia.IO/Interop/Apple/Interop.Apple.xattr.cs

@@ -0,0 +1,126 @@
+//
+// Interop.Apple.xattr.cs
+//
+// Author:
+//       Natalia Portillo <claunia@claunia.com>
+//
+// Copyright (c) 2015 © Claunia.com
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+using System.Runtime.InteropServices;
+
+internal static partial class Interop
+{
+    internal static partial class Apple
+    {
+        enum xattrOptions : int
+        {
+            /// <summary>
+            /// Don't follow symbolic links
+            /// </summary>
+            XATTR_NOFOLLOW = 0x0001,
+            /// <summary>
+            /// Set the value and fail if the xattr already exists
+            /// </summary>
+            XATTR_CREATE = 0x0002,
+            /// <summary>
+            /// Set the value and fail if the xattr does not exist
+            /// </summary>
+            XATTR_REPLACE = 0x0004,
+            /// <summary>
+            /// Bypass authorization checking
+            /// </summary>
+            XATTR_NOSECURITY = 0x0008,
+            /// <summary>
+            /// Bypass default extended attribute file (._file)
+            /// </summary>
+            XATTR_NODEFAULT = 0x0010,
+            /// <summary>
+            /// Expose the HFS+ compression extended attributes
+            /// </summary>
+            XATTR_SHOWCOMPRESSION = 0x0020
+        }
+
+        /// <summary>
+        /// Maximum length of xattr name
+        /// </summary>
+        const int XATTR_MAXNAMELEN = 127;
+
+        /// <summary>
+        /// Name for <see cref="Claunia.IO.FinderInfo"/> as a xattr
+        /// </summary>
+        const int XATTR_FINDERINFO_NAME = "com.apple.FinderInfo";
+        /// <summary>
+        /// Name for resource fork as a xattr
+        /// </summary>
+        const int XATTR_RESOURCEFORK_NAME = "com.apple.ResourceFork";
+
+        /// <summary>
+        /// Gets an extended attribute value
+        /// </summary>
+        /// <param name="path">Path to the file.</param>
+        /// <param name="name">Name of the extended attribute.</param>
+        /// <param name="value">Pointer to a buffer where to store the extended attribute.</param>
+        /// <param name="size">Size of the allocated buffer.</param>
+        /// <param name="position">Offset of the extended attribute where to start reading, valid only for resource forks, 0 for rest.</param>
+        /// <param name="options"><see cref="xattrOptions"/>.</param>
+        /// <returns>Size of the extended attribute. On failure, -1, and errno is set</returns>
+        [DllImport(Libraries.Libc, SetLastError = true)]
+        public static extern int getxattr(string path, string name, IntPtr value, UInt32 size, UInt32 position, xattrOptions options);
+
+        /// <summary>
+        /// Sets an extended attribute value
+        /// </summary>
+        /// <param name="path">Path to the file.</param>
+        /// <param name="name">Name of the extended attribute.</param>
+        /// <param name="value">Pointer to a buffer where the extended attribute is stored.</param>
+        /// <param name="size">Size of the allocated buffer.</param>
+        /// <param name="position">Offset of the extended attribute where to start writing, valid only for resource forks, 0 for rest.</param>
+        /// <param name="options"><see cref="xattrOptions"/>.</param>
+        /// <returns>On success, 0. On failure, -1, and errno is set</returns>
+        [DllImport(Libraries.Libc, SetLastError = true)]
+        public static extern int getxattr(string path, string name, IntPtr value, UInt32 size, UInt32 position, xattrOptions options);
+
+        /// <summary>
+        /// Removes an extended attribute
+        /// </summary>
+        /// <param name="path">Path to the file.</param>
+        /// <param name="name">Name of the extended attribute.</param>
+        /// <param name="options"><see cref="xattrOptions"/>.</param>
+        /// <returns>On success, 0. On failure, -1, and errno is set</returns>
+        [DllImport(Libraries.Libc, SetLastError = true)]
+        public static extern int removexattr(string path, string name, xattrOptions options);
+
+        /// <summary>
+        /// Lists the extended attributes from a file
+        /// </summary>
+        /// <param name="path">Path to the file.</param>
+        /// <param name="namebuf">Pointer to a buffer where an unordered list of null terminated UTF-8 strings wth the extended attributes names is to be stored.</param>
+        /// <param name="size">Size of the allocated buffer.</param>
+        /// <param name="options"><see cref="xattrOptions"/>.</param>
+        /// <returns>If <paramref name="namebuf"/> is set to null, the needed size to store the whole list.
+        /// On success, the size of the list.
+        /// If the file has no extended attributes, 0.
+        /// On failure, -1, and errno is set</returns>
+        [DllImport(Libraries.Libc, SetLastError = true)]
+        public static extern int listxattr(string path, IntPtr namebuf, UInt32 size, xattrOptions options);
+    }
+}
+