Port extension code for zlib constant names from UnshieldSharp

SabreTools.Compression/zlib/zlibConst.cs

@@ -19,5 +19,29 @@ namespace SabreTools.Compression.zlib
         public const int Z_MEM_ERROR = (-4);
         public const int Z_BUF_ERROR = (-5);
         public const int Z_VERSION_ERROR = (-6);
+
+        /// <summary>
+        /// Get the zlib result name from an integer
+        /// </summary>
+        /// <param name="result">Integer to translate to the result name</param>
+        /// <returns>Name of the result, the integer as a string otherwise</returns>
+        public static string ToZlibConstName(this int result)
+        {
+            return result switch
+            {
+                0 => "Z_OK",
+                1 => "Z_STREAM_END",
+                2 => "Z_NEED_DICT",
+
+                -1 => "Z_ERRNO",
+                -2 => "Z_STREAM_ERROR",
+                -3 => "Z_DATA_ERROR",
+                -4 => "Z_MEM_ERROR",
+                -5 => "Z_BUF_ERROR",
+                -6 => "Z_VERSION_ERROR",
+
+                _ => result.ToString(),
+            };
+        }
     }
 }