Feature/multirar (#43)

* Implementation of multi-volume archive support, RAR test case

Author: jas88

CHANGELOG.md

@@ -0,0 +1,15 @@
+v0.1.4 - Jun 28 2023
+
+- Add support for multi-volume archives
+
+v0.1.3 - Dec 23 2022
+
+- Add optional argument to LibArchiveReader to configure blocksize, default 1MiB
+
+v0.1.2 - Oct 27 2022
+
+- Fix memory leak on Linux in musl-libc malloc
+
+v0.1.1 - Sep 22 2022
+
+- First full release, supporting Linux, Windows and MacOS x64 plus MacOS ARM64

LibArchive.Net/LibArchiveReader.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Runtime.InteropServices;
 using Microsoft.Win32.SafeHandles;
 
@@ -52,7 +53,20 @@ public LibArchiveReader(string filename,uint blockSize = 1<<20) : base(true)
         archive_read_support_filter_all(handle);
         archive_read_support_format_all(handle);
         if (archive_read_open_filename(handle, uName.Ptr, (int)blockSize) != 0)
-            throw new ApplicationException("TODO: Archive open failed");
+            Throw();
+    }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public LibArchiveReader(string[] filenames,uint blockSize=1<<20) : base(true)
+    {
+        using var names = new DisposableStringArray(filenames);
+        handle = archive_read_new();
+        archive_read_support_filter_all(handle);
+        archive_read_support_format_all(handle);
+        if (archive_read_open_filenames(handle, names.Ptr, (int)blockSize) != 0)
+            Throw();
     }
 
     private void Throw()
@@ -147,6 +161,9 @@ public override long Position
     [DllImport("archive")]
     private static extern int archive_read_open_filename(IntPtr a, IntPtr filename, int blocksize);
 
+    [DllImport("archive")]
+    private static extern int archive_read_open_filenames(IntPtr a, IntPtr filename, int blocksize);
+
     [DllImport("archive")]
     private static extern int archive_read_data(IntPtr a, ref byte buff, int size);
 
@@ -162,3 +179,30 @@ public override long Position
     [DllImport("archive")]
     private static extern IntPtr archive_error_string(IntPtr a);
 }
+
+public class DisposableStringArray : IDisposable
+{
+    private readonly IntPtr[] backing;
+    private readonly GCHandle handle;
+    private readonly SafeStringBuffer[] strings;
+
+    public DisposableStringArray(string[] a)
+    {
+        backing = new IntPtr[a.Length+1];
+        strings = a.Select(s => new SafeStringBuffer(s)).ToArray();
+        for (int i=0;i<strings.Length;i++)
+            backing[i] = strings[i].Ptr;
+        backing[strings.Length] = IntPtr.Zero;
+        handle = GCHandle.Alloc(backing, GCHandleType.Pinned);
+    }
+
+    public IntPtr Ptr => handle.AddrOfPinnedObject();
+
+    public void Dispose()
+    {
+        GC.SuppressFinalize(this);
+        handle.Free();
+        foreach (var s in strings)
+            s.Dispose();
+    }
+}

LibArchive.Net/SafeStringBuffer.cs

@@ -11,7 +11,7 @@ public class SafeStringBuffer : SafeHandleZeroOrMinusOneIsInvalid
     public SafeStringBuffer(string s) : base(true)
     {
         if (s is null)
-            throw new ArgumentException(nameof(s));
+            throw new ArgumentNullException(nameof(s));
         handle = Marshal.StringToCoTaskMemUTF8(s);
     }
 

Test.LibArchive.Net/7zTests.cs

@@ -0,0 +1,49 @@
+using System.Security.Cryptography;
+using System.Text;
+using LibArchive.Net;
+using NUnit.Framework;
+
+namespace Test.LibArchive.Net;
+
+public class SevenZipTests
+{
+    private readonly SHA256 hash = SHA256.Create();
+
+    [Test]
+    public void Test7z()
+    {
+        using var lar = new LibArchiveReader("7ztest.7z");
+        foreach (var e in lar.Entries())
+        {
+            using var s = e.Stream;
+            StringBuilder sb = new(e.Name,e.Name.Length+33);
+            sb.Append(' ');
+            foreach (var d in hash.ComputeHash(s))
+            {
+                sb.Append(d.ToString("x2"));
+            }
+            Console.WriteLine(sb);
+        }
+        Assert.Pass();
+    }
+
+    [Test]
+    public void TestMultiRar()
+    {
+        var files = Directory.GetFiles(TestContext.CurrentContext.TestDirectory, "rartest*.rar");
+        Array.Sort(files);
+        Assert.That(files, Has.Length.EqualTo(4), "Expected 4 RAR segments");
+        using var rar = new LibArchiveReader(files);
+        foreach (var e in rar.Entries())
+        {
+            using var s = e.Stream;
+            StringBuilder sb = new(e.Name, e.Name.Length + 33);
+            sb.Append(' ');
+            foreach (var d in hash.ComputeHash(s))
+            {
+                sb.Append(d.ToString("x2"));
+            }
+            Console.WriteLine(sb);
+        }
+    }
+}

Test.LibArchive.Net/ReaderTests.cs

@@ -17,5 +17,9 @@
     </ItemGroup>
     <ItemGroup>
         <None Update="7ztest.7z" CopyToOutputDirectory="PreserveNewest" />
+        <None Update="rartest.part00001.rar" CopyToOutputDirectory="PreserveNewest" />
+        <None Update="rartest.part00002.rar" CopyToOutputDirectory="PreserveNewest" />
+        <None Update="rartest.part00003.rar" CopyToOutputDirectory="PreserveNewest" />
+        <None Update="rartest.part00004.rar" CopyToOutputDirectory="PreserveNewest" />
     </ItemGroup>
 </Project>