Try LayoutKind.Explicit

Author: dellis1972

CompressionMethod.cs

@@ -121,6 +121,26 @@ public enum CompressionMethod : short
 		/// </summary>
 		LZ77           = 19,
 
+		/// <summary>
+		/// LZMA2 Compressed data
+		/// </summary>
+		LZMA2          = 33,
+
+		/// <summary>
+		/// Zstandard compressed data
+		/// </summary>
+		ZSTD           = 93,
+
+		/// <summary>
+		/// XZ compressed data
+		/// </summary>
+		XZ             = 95,
+
+		/// <summary>
+		/// Compressed Jpeg data
+		/// </summary>
+		JPEG           = 96,
+
 		/// <summary>
 		/// WavPack compressed data
 		/// </summary>

LibZipSharp.UnitTest/ZipTests.cs

@@ -216,7 +216,6 @@ public void UpdateEntryCompressionMethod ()
 		}
 
 		[Test]
-		[Repeat (100)]
 		public void CheckForUnknownCompressionMethods ()
 		{
 			string filePath = Path.GetFullPath ("packaged_resources");

Native.cs

@@ -47,17 +47,28 @@ public struct zip_source_args_seek_t
 			public int whence;
 		};
 
+		[StructLayout(LayoutKind.Explicit)]
 		public struct zip_stat_t
 		{
+			[FieldOffset (0)]
 			public UInt64 valid;                 /* which fields have valid values */
+			[FieldOffset (8)]
 			public IntPtr name;                  /* name of the file (char *) */
+			[FieldOffset (16)]
 			public UInt64 index;                 /* index within archive */
+			[FieldOffset (24)]
 			public UInt64 size;                  /* size of file (uncompressed) */
+			[FieldOffset (32)]
 			public UInt64 comp_size;             /* size of file (compressed) */
+			[FieldOffset (40)]
 			public IntPtr mtime;                 /* modification time (time_t) */
+			[FieldOffset (48)]
 			public UInt32 crc;                   /* crc of file data */
+			[FieldOffset (52)]
 			public Int16  comp_method;           /* compression method used */
+			[FieldOffset (56)]
 			public UInt16 encryption_method;     /* encryption method used */
+			[FieldOffset (60)]
 			public UInt32 flags;                 /* reserved for future use */
 		};
 

ZipEntry.cs

@@ -139,6 +139,7 @@ internal void Init ()
 		{
 			valid = (StatFlags)stat.valid;
 
+
 			// We mustn't free stat.name, it's handled by libzip and freeing it here would cause a crash.
 			FullName = Utilities.SanitizeFilePath (GetStatField (StatFlags.Name, () => Utilities.GetStringFromNativeAnsi (stat.name), String.Empty));
 			Index = GetStatField (StatFlags.Index, () => stat.index);
@@ -151,7 +152,6 @@ internal void Init ()
 			CompressionMethod = GetStatField (StatFlags.CompMethod, () => {
 				if (Enum.IsDefined (typeof (CompressionMethod), stat.comp_method))
 					return (CompressionMethod)stat.comp_method;
-				Console.WriteLine ($"CompressionMethod for {FullName} was Unknown. value = {stat.comp_method}.");
 				return CompressionMethod.Unknown;
 			});
 			EncryptionMethod = GetStatField (StatFlags.EncryptionMethod, () => {
@@ -160,7 +160,6 @@ internal void Init ()
 				return EncryptionMethod.Unknown;
 			});
 			IsDirectory = Size == 0 && FullName.EndsWith ("/", StringComparison.Ordinal);
-
 			byte opsys;
 			uint xattr;
 			if (Native.zip_file_get_external_attributes (archive.ArchivePointer, Index, OperationFlags.None, out opsys, out xattr) == 0) {