Port NBT impl from LibAC Dart

NBT/API/SnbtIo.cs

@@ -0,0 +1,92 @@
+using System;
+using System.IO;
+using System.Threading.Tasks;
+using System.Text;
+using LibAC.NBT.API;
+
+namespace LibAC.NBT.API
+{
+    public static class SnbtIo
+    {
+        /// <summary>
+        /// Writes a CompoundTag to a file in SNBT format.
+        /// </summary>
+        /// <param name="file">The file path to write to.</param>
+        /// <param name="tag">The CompoundTag to write.</param>
+        public static async Task WriteToFile(string file, CompoundTag tag)
+        {
+            var fileInfo = new FileInfo(file);
+
+            if (fileInfo.Exists)
+            {
+                fileInfo.Delete(); // Ensure the file is reset to 0 bytes.
+            }
+
+            var builder = new StringBuilder();
+            Tag.WriteStringifiedNamedTag(tag, builder, 0);
+
+            using (var writer = new StreamWriter(file))
+            {
+                await writer.WriteAsync(builder.ToString());
+            }
+        }
+
+        /// <summary>
+        /// Reads a tag from a file in SNBT format.
+        /// </summary>
+        /// <param name="file">The file path to read from.</param>
+        /// <returns>A Task resolving to the read Tag.</returns>
+        public static async Task<Tag> ReadFromFile(string file)
+        {
+            var fileInfo = new FileInfo(file);
+            if (!fileInfo.Exists)
+            {
+                throw new FileNotFoundException($"File not found: {file}");
+            }
+
+            string data;
+            using (var reader = new StreamReader(file))
+            {
+                data = await reader.ReadToEndAsync();
+            }
+
+            var stringReader = new StringReader(data);
+            Tag tag = new CompoundTag();
+
+            try
+            {
+                tag = Tag.ReadStringifiedNamedTag(stringReader);
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"FATAL ERROR OCCURRED AT LOCATION:\n{stringReader.GetSnapshot()}");
+                Console.WriteLine(ex);
+            }
+
+            return tag;
+        }
+
+        /// <summary>
+        /// Converts a CompoundTag to its SNBT string representation.
+        /// </summary>
+        /// <param name="tag">The CompoundTag to convert.</param>
+        /// <returns>A string representing the CompoundTag in SNBT format.</returns>
+        public static string WriteToString(CompoundTag tag)
+        {
+            var builder = new StringBuilder();
+            Tag.WriteStringifiedNamedTag(tag, builder, 0);
+            return builder.ToString();
+        }
+
+        /// <summary>
+        /// Reads a Tag from an SNBT string.
+        /// </summary>
+        /// <param name="data">The SNBT string to read.</param>
+        /// <returns>A Task resolving to the read Tag.</returns>
+        public static Task<Tag> ReadFromString(string data)
+        {
+            var stringReader = new StringReader(data);
+            return Task.FromResult(Tag.ReadStringifiedNamedTag(stringReader));
+        }
+    }
+}