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forked from tomap/SevenZipSharp
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LibraryManager.cs
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LibraryManager.cs
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namespace SevenZip
{
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Diagnostics;
using System.Security.Permissions;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
#if UNMANAGED
/// <summary>
/// 7-zip library low-level wrapper.
/// </summary>
internal static class SevenZipLibraryManager
{
/// <summary>
/// Synchronization root for all locking.
/// </summary>
private static readonly object _syncRoot = new object();
/// <summary>
/// Path to the 7-zip dll.
/// </summary>
/// <remarks>7zxa.dll supports only decoding from .7z archives.
/// Features of 7za.dll:
/// - Supporting 7z format;
/// - Built encoders: LZMA, PPMD, BCJ, BCJ2, COPY, AES-256 Encryption.
/// - Built decoders: LZMA, PPMD, BCJ, BCJ2, COPY, AES-256 Encryption, BZip2, Deflate.
/// 7z.dll (from the 7-zip distribution) supports every InArchiveFormat for encoding and decoding.
/// </remarks>
private static string _libraryFileName = DetermineLibraryFilePath();
private static string DetermineLibraryFilePath()
{
if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["7zLocation"]))
{
return ConfigurationManager.AppSettings["7zLocation"];
}
return Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), Environment.Is64BitProcess ? "7z64.dll" : "7z.dll");
}
/// <summary>
/// 7-zip library handle.
/// </summary>
private static IntPtr _modulePtr;
/// <summary>
/// 7-zip library features.
/// </summary>
private static LibraryFeature? _features;
private static Dictionary<object, Dictionary<InArchiveFormat, IInArchive>> _inArchives;
private static Dictionary<object, Dictionary<OutArchiveFormat, IOutArchive>> _outArchives;
private static int _totalUsers;
// private static string _LibraryVersion;
private static bool? _modifyCapable;
private static void InitUserInFormat(object user, InArchiveFormat format)
{
if (!_inArchives.ContainsKey(user))
{
_inArchives.Add(user, new Dictionary<InArchiveFormat, IInArchive>());
}
if (!_inArchives[user].ContainsKey(format))
{
_inArchives[user].Add(format, null);
_totalUsers++;
}
}
private static void InitUserOutFormat(object user, OutArchiveFormat format)
{
if (!_outArchives.ContainsKey(user))
{
_outArchives.Add(user, new Dictionary<OutArchiveFormat, IOutArchive>());
}
if (!_outArchives[user].ContainsKey(format))
{
_outArchives[user].Add(format, null);
_totalUsers++;
}
}
private static void Init()
{
_inArchives = new Dictionary<object, Dictionary<InArchiveFormat, IInArchive>>();
_outArchives = new Dictionary<object, Dictionary<OutArchiveFormat, IOutArchive>>();
}
/// <summary>
/// Loads the 7-zip library if necessary and adds user to the reference list
/// </summary>
/// <param name="user">Caller of the function</param>
/// <param name="format">Archive format</param>
public static void LoadLibrary(object user, Enum format)
{
lock (_syncRoot)
{
if (_inArchives == null || _outArchives == null)
{
Init();
}
if (_modulePtr == IntPtr.Zero)
{
if (!File.Exists(_libraryFileName))
{
throw new SevenZipLibraryException("DLL file does not exist.");
}
if ((_modulePtr = NativeMethods.LoadLibrary(_libraryFileName)) == IntPtr.Zero)
{
throw new SevenZipLibraryException($"failed to load library from \"{_libraryFileName}\".");
}
if (NativeMethods.GetProcAddress(_modulePtr, "GetHandlerProperty") == IntPtr.Zero)
{
NativeMethods.FreeLibrary(_modulePtr);
throw new SevenZipLibraryException("library is invalid.");
}
}
if (format is InArchiveFormat archiveFormat)
{
InitUserInFormat(user, archiveFormat);
return;
}
if (format is OutArchiveFormat outArchiveFormat)
{
InitUserOutFormat(user, outArchiveFormat);
return;
}
throw new ArgumentException(
"Enum " + format + " is not a valid archive format attribute!");
}
}
/// <summary>
/// Gets the value indicating whether the library supports modifying archives.
/// </summary>
public static bool ModifyCapable
{
get
{
lock (_syncRoot)
{
if (!_modifyCapable.HasValue)
{
FileVersionInfo dllVersionInfo = FileVersionInfo.GetVersionInfo(_libraryFileName);
_modifyCapable = dllVersionInfo.FileMajorPart >= 9;
}
return _modifyCapable.Value;
}
}
}
static readonly string Namespace = Assembly.GetExecutingAssembly().GetManifestResourceNames()[0].Split('.')[0];
private static string GetResourceString(string str)
{
return Namespace + ".arch." + str;
}
private static bool ExtractionBenchmark(string archiveFileName, Stream outStream,
ref LibraryFeature? features, LibraryFeature testedFeature)
{
var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(
GetResourceString(archiveFileName));
try
{
using (var extr = new SevenZipExtractor(stream))
{
extr.ExtractFile(0, outStream);
}
}
catch (Exception)
{
return false;
}
features |= testedFeature;
return true;
}
private static bool CompressionBenchmark(Stream inStream, Stream outStream,
OutArchiveFormat format, CompressionMethod method,
ref LibraryFeature? features, LibraryFeature testedFeature)
{
try
{
var compr = new SevenZipCompressor { ArchiveFormat = format, CompressionMethod = method };
compr.CompressStream(inStream, outStream);
}
catch (Exception)
{
return false;
}
features |= testedFeature;
return true;
}
public static LibraryFeature CurrentLibraryFeatures
{
get
{
lock (_syncRoot)
{
if (_features != null && _features.HasValue)
{
return _features.Value;
}
_features = LibraryFeature.None;
#region Benchmark
#region Extraction features
using (var outStream = new MemoryStream())
{
ExtractionBenchmark("Test.lzma.7z", outStream, ref _features, LibraryFeature.Extract7z);
ExtractionBenchmark("Test.lzma2.7z", outStream, ref _features, LibraryFeature.Extract7zLZMA2);
var i = 0;
if (ExtractionBenchmark("Test.bzip2.7z", outStream, ref _features, _features.Value))
{
i++;
}
if (ExtractionBenchmark("Test.ppmd.7z", outStream, ref _features, _features.Value))
{
i++;
if (i == 2 && (_features & LibraryFeature.Extract7z) != 0 &&
(_features & LibraryFeature.Extract7zLZMA2) != 0)
{
_features |= LibraryFeature.Extract7zAll;
}
}
ExtractionBenchmark("Test.rar", outStream, ref _features, LibraryFeature.ExtractRar);
ExtractionBenchmark("Test.tar", outStream, ref _features, LibraryFeature.ExtractTar);
ExtractionBenchmark("Test.txt.bz2", outStream, ref _features, LibraryFeature.ExtractBzip2);
ExtractionBenchmark("Test.txt.gz", outStream, ref _features, LibraryFeature.ExtractGzip);
ExtractionBenchmark("Test.txt.xz", outStream, ref _features, LibraryFeature.ExtractXz);
ExtractionBenchmark("Test.zip", outStream, ref _features, LibraryFeature.ExtractZip);
}
#endregion
#region Compression features
using (var inStream = new MemoryStream())
{
inStream.Write(Encoding.UTF8.GetBytes("Test"), 0, 4);
using (var outStream = new MemoryStream())
{
CompressionBenchmark(inStream, outStream,
OutArchiveFormat.SevenZip, CompressionMethod.Lzma,
ref _features, LibraryFeature.Compress7z);
CompressionBenchmark(inStream, outStream,
OutArchiveFormat.SevenZip, CompressionMethod.Lzma2,
ref _features, LibraryFeature.Compress7zLZMA2);
var i = 0;
if (CompressionBenchmark(inStream, outStream,
OutArchiveFormat.SevenZip, CompressionMethod.BZip2,
ref _features, _features.Value))
{
i++;
}
if (CompressionBenchmark(inStream, outStream,
OutArchiveFormat.SevenZip, CompressionMethod.Ppmd,
ref _features, _features.Value))
{
i++;
if (i == 2 && (_features & LibraryFeature.Compress7z) != 0 &&
(_features & LibraryFeature.Compress7zLZMA2) != 0)
{
_features |= LibraryFeature.Compress7zAll;
}
}
CompressionBenchmark(inStream, outStream,
OutArchiveFormat.Zip, CompressionMethod.Default,
ref _features, LibraryFeature.CompressZip);
CompressionBenchmark(inStream, outStream,
OutArchiveFormat.BZip2, CompressionMethod.Default,
ref _features, LibraryFeature.CompressBzip2);
CompressionBenchmark(inStream, outStream,
OutArchiveFormat.GZip, CompressionMethod.Default,
ref _features, LibraryFeature.CompressGzip);
CompressionBenchmark(inStream, outStream,
OutArchiveFormat.Tar, CompressionMethod.Default,
ref _features, LibraryFeature.CompressTar);
CompressionBenchmark(inStream, outStream,
OutArchiveFormat.XZ, CompressionMethod.Default,
ref _features, LibraryFeature.CompressXz);
}
}
#endregion
#endregion
if (ModifyCapable && (_features.Value & LibraryFeature.Compress7z) != 0)
{
_features |= LibraryFeature.Modify;
}
return _features.Value;
}
}
}
/// <summary>
/// Removes user from reference list and frees the 7-zip library if it becomes empty
/// </summary>
/// <param name="user">Caller of the function</param>
/// <param name="format">Archive format</param>
public static void FreeLibrary(object user, Enum format)
{
var sp = new SecurityPermission(SecurityPermissionFlag.UnmanagedCode);
sp.Demand();
lock (_syncRoot)
{
if (_modulePtr != IntPtr.Zero)
{
if (format is InArchiveFormat archiveFormat)
{
if (_inArchives != null && _inArchives.ContainsKey(user) &&
_inArchives[user].ContainsKey(archiveFormat) &&
_inArchives[user][archiveFormat] != null)
{
try
{
Marshal.ReleaseComObject(_inArchives[user][archiveFormat]);
}
catch (InvalidComObjectException) {}
_inArchives[user].Remove(archiveFormat);
_totalUsers--;
if (_inArchives[user].Count == 0)
{
_inArchives.Remove(user);
}
}
}
if (format is OutArchiveFormat outArchiveFormat)
{
if (_outArchives != null && _outArchives.ContainsKey(user) &&
_outArchives[user].ContainsKey(outArchiveFormat) &&
_outArchives[user][outArchiveFormat] != null)
{
try
{
Marshal.ReleaseComObject(_outArchives[user][outArchiveFormat]);
}
catch (InvalidComObjectException) {}
_outArchives[user].Remove(outArchiveFormat);
_totalUsers--;
if (_outArchives[user].Count == 0)
{
_outArchives.Remove(user);
}
}
}
if ((_inArchives == null || _inArchives.Count == 0) && (_outArchives == null || _outArchives.Count == 0))
{
_inArchives = null;
_outArchives = null;
if (_totalUsers == 0)
{
NativeMethods.FreeLibrary(_modulePtr);
_modulePtr = IntPtr.Zero;
}
}
}
}
}
/// <summary>
/// Gets IInArchive interface to extract 7-zip archives.
/// </summary>
/// <param name="format">Archive format.</param>
/// <param name="user">Archive format user.</param>
public static IInArchive InArchive(InArchiveFormat format, object user)
{
lock (_syncRoot)
{
if (_inArchives[user][format] == null)
{
var sp = new SecurityPermission(SecurityPermissionFlag.UnmanagedCode);
sp.Demand();
if (_modulePtr == IntPtr.Zero)
{
LoadLibrary(user, format);
if (_modulePtr == IntPtr.Zero)
{
throw new SevenZipLibraryException();
}
}
var createObject = (NativeMethods.CreateObjectDelegate)
Marshal.GetDelegateForFunctionPointer(
NativeMethods.GetProcAddress(_modulePtr, "CreateObject"),
typeof(NativeMethods.CreateObjectDelegate));
if (createObject == null)
{
throw new SevenZipLibraryException();
}
object result;
Guid interfaceId = typeof(IInArchive).GUID;
Guid classID = Formats.InFormatGuids[format];
try
{
createObject(ref classID, ref interfaceId, out result);
}
catch (Exception)
{
throw new SevenZipLibraryException("Your 7-zip library does not support this archive type.");
}
InitUserInFormat(user, format);
_inArchives[user][format] = result as IInArchive;
}
return _inArchives[user][format];
}
}
/// <summary>
/// Gets IOutArchive interface to pack 7-zip archives.
/// </summary>
/// <param name="format">Archive format.</param>
/// <param name="user">Archive format user.</param>
public static IOutArchive OutArchive(OutArchiveFormat format, object user)
{
lock (_syncRoot)
{
if (_outArchives[user][format] == null)
{
var sp = new SecurityPermission(SecurityPermissionFlag.UnmanagedCode);
sp.Demand();
if (_modulePtr == IntPtr.Zero)
{
throw new SevenZipLibraryException();
}
var createObject = (NativeMethods.CreateObjectDelegate)
Marshal.GetDelegateForFunctionPointer(
NativeMethods.GetProcAddress(_modulePtr, "CreateObject"),
typeof(NativeMethods.CreateObjectDelegate));
object result;
Guid interfaceId = typeof(IOutArchive).GUID;
Guid classID = Formats.OutFormatGuids[format];
try
{
createObject(ref classID, ref interfaceId, out result);
}
catch (Exception)
{
throw new SevenZipLibraryException("Your 7-zip library does not support this archive type.");
}
InitUserOutFormat(user, format);
_outArchives[user][format] = result as IOutArchive;
}
return _outArchives[user][format];
}
}
public static void SetLibraryPath(string libraryPath)
{
if (_modulePtr != IntPtr.Zero && !Path.GetFullPath(libraryPath).Equals(
Path.GetFullPath(_libraryFileName), StringComparison.OrdinalIgnoreCase))
{
throw new SevenZipLibraryException(
"can not change the library path while the library \"" + _libraryFileName + "\" is being used.");
}
if (!File.Exists(libraryPath))
{
throw new SevenZipLibraryException(
"can not change the library path because the file \"" + libraryPath + "\" does not exist.");
}
_libraryFileName = libraryPath;
_features = null;
}
}
#endif
}