[ZOO] Implement GetEntryNumber.

Aaru.Archives/Zoo/Files.cs

@@ -26,6 +26,7 @@
 // Copyright © 2011-2025 Natalia Portillo
 // ****************************************************************************/
 
+using System;
 using System.IO;
 using System.Runtime.InteropServices;
 using Aaru.CommonTypes.Enums;
@@ -110,5 +111,29 @@ public sealed partial class Zoo
         return ErrorNumber.NoError;
     }
 
+    /// <inheritdoc />
+    public ErrorNumber GetEntryNumber(string fileName, bool caseInsensitiveMatch, out int entryNumber)
+    {
+        // This can be done faster, it's 7am, gimme a break
+        entryNumber = -1;
+
+        if(!Opened) return ErrorNumber.NotOpened;
+
+        StringComparison comparison = caseInsensitiveMatch
+                                          ? StringComparison.CurrentCultureIgnoreCase
+                                          : StringComparison.CurrentCulture;
+
+        for(int i = 0, count = _files.Count; i < count; i++)
+        {
+            if(GetFilename(i, out string name) != ErrorNumber.NoError || !name.Equals(fileName, comparison)) continue;
+
+            entryNumber = i;
+
+            return ErrorNumber.NoError;
+        }
+
+        return ErrorNumber.NoSuchFile;
+    }
+
 #endregion
 }

Aaru.Archives/Zoo/Unimplemented.cs

@@ -37,11 +37,6 @@ public sealed partial class Zoo
 {
 #region IArchive Members
 
-    /// <inheritdoc />
-    public ErrorNumber GetEntryNumber(string fileName, bool caseInsensitiveMatch, out int entryNumber) =>
-        throw new NotImplementedException();
-
-
     /// <inheritdoc />
     public ErrorNumber Stat(int entryNumber, out FileEntryInfo stat) => throw new NotImplementedException();