Add cabinet finding

BurnOutSharp/FileType/MicrosoftCAB.cs

@@ -269,6 +269,18 @@ namespace BurnOutSharp.FileType
 
             #region Public Functionality
 
+            /// <summary>
+            /// Find the start of an MS-CAB cabinet in a set of data, if possible
+            /// </summary>
+            public int FindCabinet(byte[] data)
+            {
+                if (data == null || data.Length < CFHEADER.SignatureBytes.Length)
+                    return -1;
+
+                bool found = data.FirstPosition(CFHEADER.SignatureBytes, out int index);
+                return found ? index : -1;
+            }
+
             /// <summary>
             /// Extract a single file from the archive to <paramref name="outputDirectory"/>
             /// </summary>

BurnOutSharp/Tools/Extensions.cs

@@ -164,6 +164,15 @@ namespace BurnOutSharp.Tools
             return positions;
         }
 
+        /// <summary>
+        /// Find the first position of one array in another, if possible
+        /// </summary>
+        public static bool FirstPosition(this byte[] stack, byte[] needle, out int position, int start = 0, int end = -1)
+        {
+            byte?[] nullableNeedle = needle != null ? needle.Select(b => (byte?)b).ToArray() : null;
+            return stack.FirstPosition(nullableNeedle, out position, start, end);
+        }
+
         /// <summary>
         /// Find the first position of one array in another, if possible
         /// </summary>