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/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;
using System.Collections.Generic;
namespace Tizen.Runtime.Coreclr
{
public class AssemblyLoader : AssemblyLoadContext
{
private const string NativeAssemblyInfix = ".ni";
private const string DllAssemblySuffix = ".dll";
private const string NativeDllAssemblySuffix = NativeAssemblyInfix + DllAssemblySuffix;
private static readonly string[] s_suffixes = new string[] { NativeDllAssemblySuffix, DllAssemblySuffix };
private SortedSet<string> _dllDirectories = new SortedSet<string>();
private SortedSet<string> _nativeDirectories = new SortedSet<string>();
private HashSet<FileInfo> _dllCache = new HashSet<FileInfo>();
public AssemblyLoader()
{
AssemblyLoadContext.Default.Resolving += OnResolving;
}
public IEnumerable<string> DllDirectories
{
get { return _dllDirectories; }
}
public IEnumerable<string> NativeDirectories
{
get { return _nativeDirectories; }
}
public void AddSearchableDirectory(string directory)
{
if (Directory.Exists(directory))
{
_dllDirectories.Add(directory);
_nativeDirectories.Add(directory);
foreach (var file in Directory.GetFiles(directory))
{
var info = new FileInfo(file);
if (info.Extension == DllAssemblySuffix)
{
_dllCache.Add(info);
}
}
}
}
public void RemoveSearchableDirectory(string directory)
{
_dllDirectories.Remove(directory);
_nativeDirectories.Remove(directory);
_dllCache.RemoveWhere(x => x.DirectoryName == directory);
}
public Assembly LoadFromPath(string path)
{
if (0 == string.Compare(path, // strA
path.Length - NativeDllAssemblySuffix.Length, // indexA
NativeAssemblyInfix, // strB
0, // indexB
NativeAssemblyInfix.Length, // length
StringComparison.OrdinalIgnoreCase)) // options
{
return LoadFromNativeImagePath(path, null);
}
else
{
return LoadFromAssemblyPath(path);
}
}
protected override Assembly Load(AssemblyName assemblyName)
{
return Resolve(assemblyName);
}
protected override IntPtr LoadUnmanagedDll(string unmanagedDllName)
{
IntPtr native = base.LoadUnmanagedDll(unmanagedDllName);
if (native == IntPtr.Zero)
{
foreach (string dir in NativeDirectories)
{
FileInfo f = new FileInfo(Path.Combine(dir, unmanagedDllName));
if (File.Exists(f.FullName))
{
native = LoadUnmanagedDllFromPath(f.FullName);
break;
}
}
}
return native;
}
private Assembly Resolve(AssemblyName assemblyName)
{
foreach (string suffix in s_suffixes)
{
var info = _dllCache.FirstOrDefault(x => x.Name == assemblyName.Name + suffix);
if (info != null)
{
return LoadFromPath(info.FullName);
}
}
return null;
}
private Assembly OnResolving(AssemblyLoadContext context, AssemblyName assemblyName)
{
return Resolve(assemblyName);
}
}
}
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