mirror of https://github.com/SixLabors/ImageSharp
James South
12 years ago
18 changed files with 305 additions and 100 deletions
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// --------------------------------------------------------------------------------------------------------------------
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// <copyright file="ImageProcessorNativeBinaryModule.cs" company="James South">
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// Copyright (c) James South.
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// Licensed under the Apache License, Version 2.0.
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// </copyright>
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// <summary>
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// The image processing native binary module.
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// </summary>
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// --------------------------------------------------------------------------------------------------------------------
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namespace ImageProcessor.Web.HttpModules |
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{ |
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using System; |
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using System.Collections.Generic; |
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using System.IO; |
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using System.Linq; |
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using System.Reflection; |
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using System.Web; |
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using ImageProcessor.Web.Helpers; |
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/// <summary>
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/// Controls the loading and unloading of any native binaries required by ImageProcessor.Web.
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/// </summary>
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public sealed class ImageProcessorNativeBinaryModule : IHttpModule |
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{ |
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/// <summary>
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/// Whether the process is running in 64bit mode. Used for calling the correct dllimport method.
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/// </summary>
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private static readonly bool Is64Bit = Environment.Is64BitProcess; |
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/// <summary>
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/// The object to lock against.
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/// </summary>
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private static readonly object SyncRoot = new object(); |
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/// <summary>
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/// The native binaries.
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/// </summary>
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private static readonly List<IntPtr> NativeBinaries = new List<IntPtr>(); |
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/// <summary>
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/// A value indicating whether this instance of the given entity has been disposed.
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/// </summary>
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/// <value><see langword="true"/> if this instance has been disposed; otherwise, <see langword="false"/>.</value>
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/// <remarks>
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/// If the entity is disposed, it must not be disposed a second
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/// time. The isDisposed field is set the first time the entity
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/// is disposed. If the isDisposed field is true, then the Dispose()
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/// method will not dispose again. This help not to prolong the entity's
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/// life in the Garbage Collector.
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/// </remarks>
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private bool isDisposed; |
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/// <summary>
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/// Disposes of the resources (other than memory) used by the module that implements
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/// <see cref="T:System.Web.IHttpModule" />.
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/// </summary>
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public void Dispose() |
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{ |
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if (this.isDisposed) |
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{ |
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return; |
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} |
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// Call the appropriate methods to clean up
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// unmanaged resources here.
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lock (SyncRoot) |
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{ |
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this.FreeNativeBinaries(); |
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} |
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// Note disposing is done.
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this.isDisposed = true; |
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} |
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/// <summary>
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/// Initializes a module and prepares it to handle requests.
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/// </summary>
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/// <param name="context">An <see cref="T:System.Web.HttpApplication" /> that provides access to
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/// the methods, properties, and events common to all application objects within an ASP.NET application</param>
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public void Init(HttpApplication context) |
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{ |
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} |
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/// <summary>
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/// Loads any native ImageProcessor binaries.
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/// </summary>
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public void LoadNativeBinaries() |
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{ |
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lock (SyncRoot) |
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{ |
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this.RegisterNativeBinaries(); |
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} |
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} |
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/// <summary>
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/// Registers any native binaries.
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/// </summary>
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/// <exception cref="ApplicationException">
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/// Thrown when a native binary cannot be loaded.
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/// </exception>
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private void RegisterNativeBinaries() |
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{ |
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if (NativeBinaries.Any()) |
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{ |
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return; |
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} |
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string folder = Is64Bit ? "x64" : "x86"; |
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string sourcePath = HttpContext.Current.Server.MapPath("~/bin/" + folder); |
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string targetBasePath = new Uri(Assembly.GetExecutingAssembly().Location).LocalPath; |
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DirectoryInfo directoryInfo = new DirectoryInfo(sourcePath); |
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if (directoryInfo.Exists) |
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{ |
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foreach (FileInfo fileInfo in directoryInfo.EnumerateFiles("*.dll")) |
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{ |
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if (fileInfo.Name.ToUpperInvariant().StartsWith("IMAGEPROCESSOR")) |
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{ |
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IntPtr pointer; |
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string targetPath = Path.GetFullPath(Path.Combine(targetBasePath, "..\\" + folder + "\\" + fileInfo.Name)); |
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File.Copy(sourcePath, targetPath, true); |
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try |
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{ |
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// Load the binary into memory.
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pointer = NativeMethods.LoadLibrary(targetPath); |
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} |
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catch (Exception ex) |
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{ |
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throw new ApplicationException(ex.Message); |
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} |
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if (pointer == IntPtr.Zero) |
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{ |
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throw new ApplicationException("Cannot load " + fileInfo.Name); |
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} |
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NativeBinaries.Add(pointer); |
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} |
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} |
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} |
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} |
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/// <summary>
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/// Frees the reference to the native binaries.
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/// </summary>
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private void FreeNativeBinaries() |
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{ |
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foreach (IntPtr nativeBinary in NativeBinaries) |
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{ |
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// According to http://stackoverflow.com/a/2445558/427899 you need to call this twice.
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NativeMethods.FreeLibrary(nativeBinary); |
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NativeMethods.FreeLibrary(nativeBinary); |
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} |
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} |
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} |
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} |
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