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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Linq;
using IPA.Logging;
using Mono.Cecil;
#if NET3
using Net3_Proxy;
using Directory = Net3_Proxy.Directory;
using Path = Net3_Proxy.Path;
using File = Net3_Proxy.File;
#endif
namespace IPA.Loader
{
internal class CecilLibLoader : BaseAssemblyResolver
{
public override AssemblyDefinition Resolve(AssemblyNameReference name, ReaderParameters parameters)
{
LibLoader.SetupAssemblyFilenames();
if (LibLoader.FilenameLocations.TryGetValue($"{name.Name}.{name.Version}.dll", out var path))
{
if (File.Exists(path))
return AssemblyDefinition.ReadAssembly(path, parameters);
}
else if (LibLoader.FilenameLocations.TryGetValue($"{name.Name}.dll", out path))
{
if (File.Exists(path))
return AssemblyDefinition.ReadAssembly(path, parameters);
}
return base.Resolve(name, parameters);
}
}
internal static class LibLoader
{
internal static string LibraryPath => Path.Combine(Environment.CurrentDirectory, "Libs");
internal static string NativeLibraryPath => Path.Combine(LibraryPath, "Native");
internal static Dictionary<string, string> FilenameLocations;
internal static void Configure()
{
AppDomain.CurrentDomain.AssemblyResolve -= AssemblyLibLoader;
AppDomain.CurrentDomain.AssemblyResolve += AssemblyLibLoader;
SetupAssemblyFilenames(true);
}
internal static void SetupAssemblyFilenames(bool force = false)
{
if (FilenameLocations == null || force)
{
FilenameLocations = new Dictionary<string, string>();
foreach (var fn in TraverseTree(LibraryPath, s => s != NativeLibraryPath))
if (FilenameLocations.ContainsKey(fn.Name))
Log(Logger.Level.Critical, $"Multiple instances of {fn.Name} exist in Libs! Ignoring {fn.FullName}");
else FilenameLocations.Add(fn.Name, fn.FullName);
if (!SetDefaultDllDirectories(LoadLibraryFlags.LOAD_LIBRARY_SEARCH_USER_DIRS | LoadLibraryFlags.LOAD_LIBRARY_SEARCH_SYSTEM32
| LoadLibraryFlags.LOAD_LIBRARY_SEARCH_DEFAULT_DIRS | LoadLibraryFlags.LOAD_LIBRARY_SEARCH_APPLICATION_DIR))
{
var err = new Win32Exception();
Log(Logger.Level.Critical, $"Error configuring DLL search path");
Log(Logger.Level.Critical, err);
return;
}
void AddDir(string path)
{
var retPtr = AddDllDirectory(path);
if (retPtr == IntPtr.Zero)
{
var err = new Win32Exception();
Log(Logger.Level.Warning, $"Could not add DLL directory");
Log(Logger.Level.Warning, err);
}
}
if (Directory.Exists(NativeLibraryPath))
{
AddDir(NativeLibraryPath);
TraverseTree(NativeLibraryPath, dir =>
{ // this is a terrible hack for iterating directories
AddDir(dir); return true;
}).All(f => true); // force it to iterate all
}
var unityData = Directory.EnumerateDirectories(Environment.CurrentDirectory, "*_Data").First();
AddDir(Path.Combine(unityData, "Plugins"));
foreach (var dir in Environment.GetEnvironmentVariable("path").Split(Path.PathSeparator))
AddDir(dir);
}
}
public static Assembly AssemblyLibLoader(object source, ResolveEventArgs e)
{
var asmName = new AssemblyName(e.Name);
return LoadLibrary(asmName);
}
internal static Assembly LoadLibrary(AssemblyName asmName)
{
Log(Logger.Level.Debug, $"Resolving library {asmName}");
SetupAssemblyFilenames();
var testFile = $"{asmName.Name}.{asmName.Version}.dll";
Log(Logger.Level.Debug, $"Looking for file {testFile}");
if (FilenameLocations.TryGetValue(testFile, out var path))
{
Log(Logger.Level.Debug, $"Found file {testFile} as {path}");
if (File.Exists(path))
return Assembly.LoadFrom(path);
Log(Logger.Level.Critical, $"but {path} no longer exists!");
}
else if (FilenameLocations.TryGetValue(testFile = $"{asmName.Name}.dll", out path))
{
Log(Logger.Level.Debug, $"Found file {testFile} as {path}");
if (File.Exists(path))
return Assembly.LoadFrom(path);
Log(Logger.Level.Critical, $"but {path} no longer exists!");
}
Log(Logger.Level.Critical, $"No library {asmName} found");
return null;
}
internal static void Log(Logger.Level lvl, string message)
{ // multiple proxy methods to delay loading of assemblies until it's done
if (Logger.LogCreated)
AssemblyLibLoaderCallLogger(lvl, message);
else
if (((byte)lvl & (byte)StandardLogger.PrintFilter) != 0)
Console.WriteLine($"[{lvl}] {message}");
}
internal static void Log(Logger.Level lvl, Exception message)
{ // multiple proxy methods to delay loading of assemblies until it's done
if (Logger.LogCreated)
AssemblyLibLoaderCallLogger(lvl, message);
else
if (((byte)lvl & (byte)StandardLogger.PrintFilter) != 0)
Console.WriteLine($"[{lvl}] {message}");
}
private static void AssemblyLibLoaderCallLogger(Logger.Level lvl, string message) => Logger.libLoader.Log(lvl, message);
private static void AssemblyLibLoaderCallLogger(Logger.Level lvl, Exception message) => Logger.libLoader.Log(lvl, message);
// https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/file-system/how-to-iterate-through-a-directory-tree
private static IEnumerable<FileInfo> TraverseTree(string root, Func<string, bool> dirValidator = null)
{
if (dirValidator == null) dirValidator = s => true;
Stack<string> dirs = new Stack<string>(32);
if (!Directory.Exists(root))
throw new ArgumentException();
dirs.Push(root);
while (dirs.Count > 0)
{
string currentDir = dirs.Pop();
string[] subDirs;
try
{
subDirs = Directory.GetDirectories(currentDir);
}
catch (UnauthorizedAccessException)
{ continue; }
catch (DirectoryNotFoundException)
{ continue; }
string[] files;
try
{
files = Directory.GetFiles(currentDir);
}
catch (UnauthorizedAccessException)
{ continue; }
catch (DirectoryNotFoundException)
{ continue; }
foreach (string str in subDirs)
if (dirValidator(str)) dirs.Push(str);
foreach (string file in files)
{
FileInfo nextValue;
try
{
nextValue = new FileInfo(file);
}
catch (FileNotFoundException)
{ continue; }
yield return nextValue;
}
}
}
[DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
private static extern IntPtr AddDllDirectory(string lpPathName);
[Flags]
[SuppressMessage("ReSharper", "InconsistentNaming")]
[SuppressMessage("ReSharper", "UnusedMember.Local")]
private enum LoadLibraryFlags : uint
{
None = 0,
LOAD_LIBRARY_SEARCH_APPLICATION_DIR = 0x00000200,
LOAD_LIBRARY_SEARCH_DEFAULT_DIRS = 0x00001000,
LOAD_LIBRARY_SEARCH_SYSTEM32 = 0x00000800,
LOAD_LIBRARY_SEARCH_USER_DIRS = 0x00000400,
}
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool SetDefaultDllDirectories(LoadLibraryFlags dwFlags);
}
}