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