class/OpenTF.Common/FileTypeDatabase.cs

   1 //
   2 // filetype.cs
   3 //
   4 // Authors:
   5 //      Joel Reed (joelwreed@gmail.com)
   6 //
   7
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Collections.Generic;
  31 using System.IO;
  32 using System.Runtime.InteropServices;
  33 using Mono.Unix;
  34
  35 namespace OpenTF.Common
  36 {
  37         public class FileTypeDatabase
  38         {
  39                 [DllImport("magic")]
  40                 private extern static IntPtr magic_open(int flags);
  41
  42                 [DllImport("magic")]
  43                 private extern static void magic_close(IntPtr magic_cookie);
  44
  45                 [DllImport("magic")]
  46                 private extern static IntPtr magic_file(IntPtr magic_cookie, string filename);
  47
  48                 [DllImport("magic")]
  49                 private extern static int magic_load(IntPtr magic_cookie, IntPtr x);
  50
  51                 private static IntPtr _magic = IntPtr.Zero;
  52
  53                 static FileTypeDatabase()
  54                 {
  55                         _magic = magic_open(0);
  56                         if (_magic == IntPtr.Zero)
  57                                 {
  58                                         Console.WriteLine("Warning: failed to open libmagic database");
  59                                         return;
  60                                 }
  61
  62                         magic_load(_magic, IntPtr.Zero);
  63                 }
  64
  65                 ~FileTypeDatabase()
  66                 {
  67                         if (_magic != IntPtr.Zero)
  68                                 magic_close(_magic);
  69                 }
  70
  71                 public static bool ShouldBeExecutable(string filename)
  72                 {
  73                         if (_magic == IntPtr.Zero) return false;
  74                         string desc = Marshal.PtrToStringAuto(magic_file(_magic, filename));
  75                         if (String.IsNullOrEmpty(desc))
  76                                 {
  77                                         Console.WriteLine("Error querying file type for " + filename);
  78                                         return false;
  79                                 }
  80
  81                         return desc.Contains("executable");
  82                 }
  83         }
  84
  85         public class FileType
  86         {
  87                 public static void MakeExecutable(string filename)
  88                 {
  89                         Mono.Unix.Native.Stat stat;
  90                         if (0 == Mono.Unix.Native.Syscall.stat(filename, out stat))
  91                                 {
  92                                         Mono.Unix.Native.FilePermissions fp = stat.st_mode | Mono.Unix.Native.FilePermissions.S_IXUSR;
  93                                         Mono.Unix.Native.Syscall.chmod(filename, fp);
  94                                 }
  95                 }
  96         }
  97 }