Fix set compresion, added nbt and snbt(wip) lib

libmc-common/src/commonMain/kotlin/cn/rtast/libmc/common/zlib.kt

@@ -12,3 +12,7 @@ public expect fun ByteArray.zlibDecompress(): ByteArray
 public expect fun ByteArray.zlibDecompress(expectedSize: Int): ByteArray
 
 public expect fun ByteArray.zlibCompress(): ByteArray
+
+public expect fun ByteArray.gzipCompress(): ByteArray
+
+public expect fun ByteArray.gzipDecompress(): ByteArray

libmc-common/src/jvmMain/kotlin/cn/rtast/libmc/common/zlib.jvm.kt

@@ -10,6 +10,7 @@ import java.io.ByteArrayInputStream
 import java.io.ByteArrayOutputStream
 import java.util.zip.Deflater
 import java.util.zip.GZIPInputStream
+import java.util.zip.GZIPOutputStream
 import java.util.zip.Inflater
 
 public actual fun ByteArray.zlibDecompress(): ByteArray {
@@ -29,28 +30,18 @@ public actual fun ByteArray.zlibDecompress(): ByteArray {
     }
 }
 
-private fun ByteArray.gzipDecompress(): ByteArray {
-    if (isEmpty()) return byteArrayOf()
-    ByteArrayInputStream(this).use { bais ->
-        GZIPInputStream(bais).use { gzis ->
-            val outputStream = ByteArrayOutputStream(this.size * 2)
-            val buffer = ByteArray(1024)
-            var len: Int
-            while (gzis.read(buffer).also { len = it } != -1) {
-                outputStream.write(buffer, 0, len)
-            }
-            return outputStream.toByteArray()
-        }
-    }
-}
-
 public actual fun ByteArray.zlibDecompress(expectedSize: Int): ByteArray {
     val inflater = Inflater()
     inflater.setInput(this)
     val result = ByteArray(expectedSize)
+    var totalRead = 0
     try {
-        val resultLength = inflater.inflate(result)
-        check(resultLength == expectedSize) { "Decompression failed: expected $expectedSize bytes, but got $resultLength" }
+        while (!inflater.finished() && totalRead < expectedSize) {
+            val read = inflater.inflate(result, totalRead, expectedSize - totalRead)
+            if (read == 0) break
+            totalRead += read
+        }
+        check(totalRead == expectedSize) { "Decompression failed: expected $expectedSize bytes, but got $totalRead" }
         return result
     } finally {
         inflater.end()
@@ -61,8 +52,22 @@ public actual fun ByteArray.zlibCompress(): ByteArray {
     val deflater = Deflater()
     deflater.setInput(this)
     deflater.finish()
-    val output = ByteArray(this.size + 64)
-    val compressedSize = deflater.deflate(output)
+    val bos = ByteArrayOutputStream(this.size)
+    val buffer = ByteArray(1024)
+    while (!deflater.finished()) {
+        val count = deflater.deflate(buffer)
+        if (count > 0) bos.write(buffer, 0, count)
+    }
     deflater.end()
-    return output.copyOf(compressedSize)
+    return bos.toByteArray()
+}
+
+public actual fun ByteArray.gzipCompress(): ByteArray {
+    val bos = ByteArrayOutputStream()
+    GZIPOutputStream(bos).use { it.write(this) }
+    return bos.toByteArray()
+}
+
+public actual fun ByteArray.gzipDecompress(): ByteArray {
+    return GZIPInputStream(ByteArrayInputStream(this)).use { it.readBytes() }
 }

libmc-common/src/nativeMain/kotlin/cn/rtast/libmc/common/zlib.native.kt

@@ -1,104 +1,131 @@
 /*
- * Copyright © 2026 RTAkland
- * Author: RTAkland
- * Date: 2026/9/4
+ * Copyright © 2025-2026 RTAkland
+ * Open Source Under Apache-2.0 License
+ * https://www.apache.org/licenses/LICENSE-2.0
  */
 
-@file:OptIn(ExperimentalForeignApi::class, UnsafeNumber::class)
+@file:OptIn(ExperimentalForeignApi::class)
 
 package cn.rtast.libmc.common
 
 import kotlinx.cinterop.*
-import platform.posix.u_longVar
 import platform.zlib.*
 
-private const val ENABLE_ZLIB_GZIP_HEADER = 15 + 32
+private const val MAX_WBITS = 15
+private const val DEFAULT_BUFFER_SIZE = 4096
 
-public actual fun ByteArray.zlibDecompress(): ByteArray {
-    if (isEmpty()) return ByteArray(0)
-    return memScoped {
-        val stream = alloc<z_stream>()
-        stream.zalloc = null
-        stream.zfree = null
-        stream.opaque = null
+private inline fun ByteArray.processDecompress(initStream: (CPointer<z_stream>) -> Unit): ByteArray = memScoped {
+    val stream = alloc<z_stream>()
+    stream.zalloc = null
+    stream.zfree = null
+    stream.opaque = null
+    initStream(stream.ptr)
+    stream.next_in = this@processDecompress.refTo(0).getPointer(this).reinterpret()
+    stream.avail_in = this@processDecompress.size.toUInt()
+    val output = mutableListOf<Byte>()
+    val tempBuffer = ByteArray(DEFAULT_BUFFER_SIZE)
 
-        val initResult = inflateInit2_(
-            stream.ptr,
-            ENABLE_ZLIB_GZIP_HEADER,
-            ZLIB_VERSION,
-            sizeOf<z_stream>().toInt()
-        )
-        check(initResult == Z_OK) { "inflateInit2_ failed with code: $initResult" }
+    try {
+        do {
+            stream.next_out = tempBuffer.refTo(0).getPointer(this).reinterpret()
+            stream.avail_out = DEFAULT_BUFFER_SIZE.toUInt()
+            val result = inflate(stream.ptr, Z_NO_FLUSH)
+            check(result == Z_OK || result == Z_STREAM_END) { "inflate error: $result" }
+            val bytesDecompressed = DEFAULT_BUFFER_SIZE - stream.avail_out.toInt()
+            output.addAll(tempBuffer.take(bytesDecompressed))
 
-        val inputPinned = this@zlibDecompress.pin()
-        try {
-            stream.next_in = inputPinned.addressOf(0).reinterpret()
-            stream.avail_in = this@zlibDecompress.size.toUInt()
-
-            val bufferSize = 4096
-            val tempBuffer = ByteArray(bufferSize)
-            val tempPinned = tempBuffer.pin()
-            val output = ArrayList<Byte>(this@zlibDecompress.size * 3)
-
-            try {
-                var result: Int
-                do {
-                    stream.next_out = tempPinned.addressOf(0).reinterpret()
-                    stream.avail_out = bufferSize.toUInt()
-
-                    result = inflate(stream.ptr, Z_NO_FLUSH)
-                    check(result == Z_OK || result == Z_STREAM_END) { "inflate error: $result" }
-
-                    val bytesDecompressed = bufferSize - stream.avail_out.toInt()
-                    for (i in 0 until bytesDecompressed) {
-                        output.add(tempBuffer[i])
-                    }
-
-                    if (result == Z_STREAM_END) break
-                } while (stream.avail_in > 0u || stream.avail_out == 0u)
-            } finally {
-                tempPinned.unpin()
-            }
-
-            inflateEnd(stream.ptr)
-            return@memScoped output.toByteArray()
-        } finally {
-            inputPinned.unpin()
-        }
+            if (result == Z_STREAM_END) break
+        } while (stream.avail_out == 0u)
+    } finally {
+        inflateEnd(stream.ptr)
     }
+    return output.toByteArray()
 }
 
-public actual fun ByteArray.zlibDecompress(expectedSize: Int): ByteArray {
+private inline fun ByteArray.processCompress(initStream: (CPointer<z_stream>) -> Unit): ByteArray = memScoped {
+    val stream = alloc<z_stream>()
+    stream.zalloc = null
+    stream.zfree = null
+    stream.opaque = null
+    initStream(stream.ptr)
+    stream.next_in = this@processCompress.refTo(0).getPointer(this).reinterpret()
+    stream.avail_in = this@processCompress.size.toUInt()
+    val output = mutableListOf<Byte>()
+    val tempBuffer = ByteArray(DEFAULT_BUFFER_SIZE)
+    try {
+        do {
+            stream.next_out = tempBuffer.refTo(0).getPointer(this).reinterpret()
+            stream.avail_out = DEFAULT_BUFFER_SIZE.toUInt()
+            val result = deflate(stream.ptr, Z_FINISH)
+            check(result == Z_OK || result == Z_STREAM_END) { "deflate error: $result" }
+            val have = DEFAULT_BUFFER_SIZE - stream.avail_out.toInt()
+            output.addAll(tempBuffer.take(have))
+        } while (stream.avail_out == 0u)
+    } finally {
+        deflateEnd(stream.ptr)
+    }
+
+    return output.toByteArray()
+}
+
+public actual fun ByteArray.zlibDecompress(expectedSize: Int): ByteArray = memScoped {
+    val stream = alloc<z_stream>()
+    stream.zalloc = null
+    stream.zfree = null
+    stream.opaque = null
+    check(inflateInit_(stream.ptr, ZLIB_VERSION, sizeOf<z_stream>().toInt()) == Z_OK) { "inflateInit_ failed" }
     val result = ByteArray(expectedSize)
-    if (this.isEmpty()) return result
-    memScoped {
-        val destLen = alloc<u_longVar>()
-        destLen.value = expectedSize.toUInt()
-        val res = uncompress(
-            result.refTo(0).getPointer(this).reinterpret(),
-            destLen.ptr,
-            this@zlibDecompress.refTo(0).getPointer(this).reinterpret(),
-            this@zlibDecompress.size.toUInt()
-        )
-        check(res == Z_OK) { "zlib uncompress failed with error code: $res" }
+    try {
+        stream.next_in = this@zlibDecompress.refTo(0).getPointer(this).reinterpret()
+        stream.avail_in = this@zlibDecompress.size.toUInt()
+        stream.next_out = result.refTo(0).getPointer(this).reinterpret()
+        stream.avail_out = expectedSize.toUInt()
+        var totalRead = 0
+        while (stream.avail_in > 0u && totalRead < expectedSize) {
+            val status = inflate(stream.ptr, Z_NO_FLUSH)
+            check(status == Z_STREAM_END || status == Z_OK) { "inflate failed with status: $status" }
+            val decompressedThisTurn = expectedSize - totalRead - stream.avail_out.toInt()
+            totalRead += decompressedThisTurn
+            if (status == Z_STREAM_END) break
+        }
+        check(totalRead == expectedSize) {
+            "Decompression failed: expected $expectedSize bytes, but got $totalRead"
+        }
+        return result
+    } finally {
+        inflateEnd(stream.ptr)
     }
-    return result
 }
 
-public actual fun ByteArray.zlibCompress(): ByteArray {
-    if (this.isEmpty()) return byteArrayOf()
-    val maxCompressedLen = compressBound(this.size.toUInt()).toInt()
-    val output = ByteArray(maxCompressedLen)
-    memScoped {
-        val destLen = alloc<u_longVar>()
-        destLen.value = maxCompressedLen.toUInt()
-        val res = compress(
-            output.refTo(0).getPointer(this).reinterpret(),
-            destLen.ptr,
-            this@zlibCompress.refTo(0).getPointer(this).reinterpret(),
-            this@zlibCompress.size.toUInt()
-        )
-        check(res == Z_OK) { "zlib compress failed with error code: $res" }
-        return output.copyOf(destLen.value.toInt())
-    }
+public actual fun ByteArray.gzipCompress(): ByteArray = processCompress { ptr ->
+    check(
+        deflateInit2_(
+            ptr, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
+            16 + MAX_WBITS, 8, Z_DEFAULT_STRATEGY, ZLIB_VERSION, sizeOf<z_stream>().toInt()
+        ) == Z_OK
+    ) { "deflateInit2_ failed" }
+}
+
+public actual fun ByteArray.gzipDecompress(): ByteArray = processDecompress { ptr ->
+    check(
+        inflateInit2_(
+            ptr, 16 + MAX_WBITS, ZLIB_VERSION, sizeOf<z_stream>().toInt()
+        ) == Z_OK
+    ) { "inflateInit2_ failed" }
+}
+
+public actual fun ByteArray.zlibCompress(): ByteArray = processCompress { ptr ->
+    check(
+        deflateInit_(
+            ptr, Z_DEFAULT_COMPRESSION, ZLIB_VERSION, sizeOf<z_stream>().toInt()
+        ) == Z_OK
+    ) { "deflateInit_ failed" }
+}
+
+public actual fun ByteArray.zlibDecompress(): ByteArray = processDecompress { ptr ->
+    check(
+        inflateInit_(
+            ptr, ZLIB_VERSION, sizeOf<z_stream>().toInt()
+        ) == Z_OK
+    ) { "inflateInit_ failed" }
 }

libmc-nbt/build.gradle.kts

@@ -14,7 +14,7 @@ kotlin {
 
     sourceSets {
         commonMain.dependencies {
-            implementation(project(":common"))
+            api(project(":common"))
         }
 
         jvmMain.dependencies {

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/BytesBufferNBTInput.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/9/5
+ */
+
+
+package cn.rtast.libmc.nbt
+
+import cn.rtast.libmc.common.ByteOrder
+import cn.rtast.libmc.common.BytesBuffer
+
+public class BytesBufferNBTInput(override val order: ByteOrder, private val buffer: BytesBuffer) : NBTInput {
+    override fun readByte(): Byte = buffer.readByte()
+    override fun readBytes(count: Int): ByteArray = buffer.readBytes(count)
+}
+
+public fun BytesBuffer.toNBTInput(order: ByteOrder = ByteOrder.BIG_ENDIAN): BytesBufferNBTInput =
+    BytesBufferNBTInput(order, this)

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/BytesBufferNBTOutput.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/9/5
+ */
+
+
+package cn.rtast.libmc.nbt
+
+import cn.rtast.libmc.common.ByteOrder
+import cn.rtast.libmc.common.BytesBuffer
+
+public class BytesBufferNBTOutput(
+    override val order: ByteOrder,
+    override val root: NBTTag.CompoundTag,
+    private val buffer: BytesBuffer,
+) : NBTOutput {
+    override fun writeByte(value: Byte): Unit = buffer.writeByte(value)
+    override fun writeBytes(value: ByteArray): Unit = buffer.writeBytes(value)
+    override fun toByteArray(): ByteArray = buffer.toByteArray()
+}
+
+public fun BytesBuffer.toNBTOutput(
+    root: NBTTag.CompoundTag,
+    order: ByteOrder = ByteOrder.BIG_ENDIAN,
+): BytesBufferNBTOutput =
+    BytesBufferNBTOutput(order, root, this)

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/CompressionType.kt

@@ -0,0 +1,14 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/1/27
+ */
+
+
+package cn.rtast.libmc.nbt
+
+public enum class CompressionType(internal val compressor: NbtCompressor?) {
+    Zlib(NbtCompressor.ZlibCompressor),
+    Gzip(NbtCompressor.GZipCompressor),
+    Raw(null)
+}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/NBTCompound.kt

@@ -0,0 +1,10 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/9/5
+ */
+
+
+package cn.rtast.libmc.nbt
+
+public data class NBTCompound(val root: String, val element: NBTTag)

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/NBTCompoundBuilder.kt

@@ -0,0 +1,83 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/1/25
+ */
+
+
+package cn.rtast.libmc.nbt
+
+@DslMarker
+public annotation class NbtDsl
+
+@NbtDsl
+public class CompoundBuilder {
+    private val tags = mutableMapOf<String, NBTTag>()
+
+
+    public infix fun String.byte(value: Byte) {
+        tags[this] = NBTTag.ByteTag(value)
+    }
+
+    public infix fun String.short(value: Short) {
+        tags[this] = NBTTag.ShortTag(value)
+    }
+
+    public infix fun String.int(value: Int) {
+        tags[this] = NBTTag.IntTag(value)
+    }
+
+    public infix fun String.long(value: Long) {
+        tags[this] = NBTTag.LongTag(value)
+    }
+
+    public infix fun String.float(value: Float) {
+        tags[this] = NBTTag.FloatTag(value)
+    }
+
+    public infix fun String.double(value: Double) {
+        tags[this] = NBTTag.DoubleTag(value)
+    }
+
+    public infix fun String.byteArray(value: ByteArray) {
+        tags[this] = NBTTag.ByteArrayTag(value)
+    }
+
+    public infix fun String.intArray(value: IntArray) {
+        tags[this] = NBTTag.IntArrayTag(value)
+    }
+
+    public infix fun String.longArray(value: LongArray) {
+        tags[this] = NBTTag.LongArrayTag(value)
+    }
+
+    public infix fun String.string(value: String) {
+        tags[this] = NBTTag.StringTag(value)
+    }
+
+    public infix fun String.compound(block: CompoundBuilder.() -> Unit) {
+        tags[this] = nbtCompound(block)
+    }
+
+    @Suppress("FunctionName")
+    private fun _list(
+        elementType: NBTType,
+        block: NBTListBuilder.() -> Unit,
+    ): NBTTag.ListTag {
+        val builder = NBTListBuilder(elementType)
+        builder.block()
+        return builder.build()
+    }
+
+    public fun String.list(elementType: NBTType, block: NBTListBuilder.() -> Unit) {
+        tags[this] = _list(elementType, block)
+    }
+
+    public fun build(): NBTTag.CompoundTag = NBTTag.CompoundTag(tags)
+}
+
+public fun nbtCompound(block: CompoundBuilder.() -> Unit): NBTTag.CompoundTag {
+    val builder = CompoundBuilder()
+    builder.block()
+    return builder.build()
+}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/NBTInput.kt

@@ -0,0 +1,67 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/1/25
+ */
+
+
+package cn.rtast.libmc.nbt
+
+import cn.rtast.libmc.common.ByteOrder
+
+public interface NBTInput {
+    public val order: ByteOrder
+
+    public fun readByte(): Byte
+    public fun readBytes(count: Int): ByteArray
+
+    public fun readLong(): Long = if (order == ByteOrder.BIG_ENDIAN) readLongBE() else readLongLE()
+    public fun readFloat(): Float = if (order == ByteOrder.BIG_ENDIAN) readFloatBE() else readFloatLE()
+    public fun readDouble(): Double = if (order == ByteOrder.BIG_ENDIAN) readDoubleBE() else readDoubleLE()
+    public fun readShort(): Short = if (order == ByteOrder.BIG_ENDIAN) readShortBE() else readShortLE()
+    public fun readInt(): Int = if (order == ByteOrder.BIG_ENDIAN) readIntBE() else readIntLE()
+
+    // big endian
+    public fun readLongBE(): Long =
+        (readIntBE().toLong() shl 32) or (readIntBE().toLong() and 0xFFFFFFFFL)
+
+    public fun readFloatBE(): Float = Float.fromBits(readIntBE())
+    public fun readDoubleBE(): Double = Double.fromBits(readLongBE())
+    public fun readShortBE(): Short {
+        val b1 = readByte().toInt() and 0xFF
+        val b2 = readByte().toInt() and 0xFF
+        return ((b1 shl 8) or b2).toShort()
+    }
+
+    public fun readIntBE(): Int {
+        return ((readByte().toInt() and 0xFF) shl 24) or
+                ((readByte().toInt() and 0xFF) shl 16) or
+                ((readByte().toInt() and 0xFF) shl 8) or
+                (readByte().toInt() and 0xFF)
+    }
+
+    // little endian
+    public fun readLongLE(): Long {
+        return ((readByte().toInt() and 0xFF).toLong() shl 0) or
+                ((readByte().toInt() and 0xFF).toLong() shl 8) or
+                ((readByte().toInt() and 0xFF).toLong() shl 16) or
+                ((readByte().toInt() and 0xFF).toLong() shl 24) or
+                ((readByte().toInt() and 0xFF).toLong() shl 32) or
+                ((readByte().toInt() and 0xFF).toLong() shl 40) or
+                ((readByte().toInt() and 0xFF).toLong() shl 48) or
+                (readByte().toInt() and 0xFF).toLong()
+    }
+
+    public fun readFloatLE(): Float = Float.fromBits(readIntLE())
+
+    public fun readDoubleLE(): Double = Double.fromBits(readLongLE())
+
+    public fun readShortLE(): Short =
+        ((readByte().toInt() and 0xFF) or (readByte().toInt() and 0xFF shl 8)).toShort()
+
+    public fun readIntLE(): Int =
+        ((readByte().toInt() and 0xFF)) or
+                ((readByte().toInt() and 0xFF) shl 8) or
+                ((readByte().toInt() and 0xFF) shl 16) or
+                ((readByte().toInt() and 0xFF) shl 24)
+}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/NBTListBuilder.kt

@@ -0,0 +1,67 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/1/25
+ */
+
+
+package cn.rtast.libmc.nbt
+
+@NbtDsl
+public class NBTListBuilder(
+    private val elementType: NBTType,
+) {
+    private val elements = mutableListOf<NBTTag>()
+
+    private fun checkType(expected: NBTType) =
+        require(elementType == expected) { "TAG_List element type must same: expected $elementType, got $expected" }
+
+    public fun byte(value: Byte) {
+        checkType(NBTType.Byte)
+        elements += NBTTag.ByteTag(value)
+    }
+
+    public fun short(value: Short) {
+        checkType(NBTType.Short)
+        elements += NBTTag.ShortTag(value)
+    }
+
+    public fun int(value: Int) {
+        checkType(NBTType.Int)
+        elements += NBTTag.IntTag(value)
+    }
+
+    public fun long(value: Long) {
+        checkType(NBTType.Long)
+        elements += NBTTag.LongTag(value)
+    }
+
+    public fun float(value: Float) {
+        checkType(NBTType.Float)
+        elements += NBTTag.FloatTag(value)
+    }
+
+    public fun double(value: Double) {
+        checkType(NBTType.Double)
+        elements += NBTTag.DoubleTag(value)
+    }
+
+    public fun string(value: String) {
+        checkType(NBTType.String)
+        elements += NBTTag.StringTag(value)
+    }
+
+    public fun compound(block: CompoundBuilder.() -> Unit) {
+        checkType(NBTType.Compound)
+        elements += nbtCompound(block)
+    }
+
+    public fun list(elementType: NBTType, block: NBTListBuilder.() -> Unit) {
+        checkType(NBTType.List)
+        val builder = NBTListBuilder(elementType)
+        builder.block()
+        elements += builder.build()
+    }
+
+    public fun build(): NBTTag.ListTag = NBTTag.ListTag(elementType, elements)
+}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/NBTOutput.kt

@@ -0,0 +1,96 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/1/25
+ */
+
+
+package cn.rtast.libmc.nbt
+
+import cn.rtast.libmc.common.ByteOrder
+
+public interface NBTOutput {
+    public val order: ByteOrder
+    public val root: NBTTag.CompoundTag
+
+    public fun writeByte(value: Byte)
+    public fun writeBytes(value: ByteArray)
+
+    public fun writeShort(value: Short): Unit =
+        if (order == ByteOrder.BIG_ENDIAN) writeShortBE(value) else writeShortLE(value)
+
+    public fun writeInt(value: Int): Unit =
+        if (order == ByteOrder.BIG_ENDIAN) writeIntBE(value) else writeIntLE(value)
+
+    public fun writeLong(value: Long): Unit =
+        if (order == ByteOrder.BIG_ENDIAN) writeLongBE(value) else writeLongLE(value)
+
+    public fun writeFloat(value: Float): Unit =
+        if (order == ByteOrder.BIG_ENDIAN) writeFloatBE(value) else writeFloatLE(value)
+
+    public fun writeDouble(value: Double): Unit =
+        if (order == ByteOrder.BIG_ENDIAN) writeDoubleBE(value) else writeDoubleLE(value)
+
+    // big endian
+    public fun writeShortBE(value: Short) {
+        writeByte(((value.toInt() shr 8) and 0xFF).toByte())
+        writeByte((value.toInt() and 0xFF).toByte())
+    }
+
+    public fun writeIntBE(value: Int) {
+        writeByte(((value shr 24) and 0xFF).toByte())
+        writeByte(((value shr 16) and 0xFF).toByte())
+        writeByte(((value shr 8) and 0xFF).toByte())
+        writeByte((value and 0xFF).toByte())
+    }
+
+    public fun writeLongBE(value: Long) {
+        writeByte(((value shr 56).toInt() and 0xFF).toByte())
+        writeByte(((value shr 48).toInt() and 0xFF).toByte())
+        writeByte(((value shr 40).toInt() and 0xFF).toByte())
+        writeByte(((value shr 32).toInt() and 0xFF).toByte())
+        writeByte(((value shr 24).toInt() and 0xFF).toByte())
+        writeByte(((value shr 16).toInt() and 0xFF).toByte())
+        writeByte(((value shr 8).toInt() and 0xFF).toByte())
+        writeByte((value.toInt() and 0xFF).toByte())
+    }
+
+    public fun writeFloatBE(value: Float) {
+        writeIntBE(value.toBits())
+    }
+
+    public fun writeDoubleBE(value: Double) {
+        writeLongBE(value.toBits())
+    }
+
+    // Little Endian
+    public fun writeShortLE(value: Short) {
+        writeByte((value.toInt() and 0xFF).toByte())
+        writeByte(((value.toInt() shr 8) and 0xFF).toByte())
+    }
+
+    public fun writeIntLE(value: Int) {
+        writeByte((value and 0xFF).toByte())
+        writeByte(((value shr 8) and 0xFF).toByte())
+        writeByte(((value shr 16) and 0xFF).toByte())
+        writeByte(((value shr 24) and 0xFF).toByte())
+    }
+
+    public fun writeLongLE(value: Long) {
+        writeByte(((value and 0xFF).toInt()).toByte())
+        writeByte((((value shr 8) and 0xFF).toInt()).toByte())
+        writeByte((((value shr 16) and 0xFF).toInt()).toByte())
+        writeByte((((value shr 24) and 0xFF).toInt()).toByte())
+        writeByte((((value shr 32) and 0xFF).toInt()).toByte())
+        writeByte((((value shr 40) and 0xFF).toInt()).toByte())
+        writeByte((((value shr 48) and 0xFF).toInt()).toByte())
+        writeByte((((value shr 56) and 0xFF).toInt()).toByte())
+    }
+
+    public fun writeFloatLE(value: Float): Unit = writeIntLE(value.toBits())
+
+    public fun writeDoubleLE(value: Double): Unit = writeLongLE(value.toBits())
+
+
+    public fun toByteArray(): ByteArray
+}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/NBTReader.kt

@@ -0,0 +1,82 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/1/25
+ */
+
+
+package cn.rtast.libmc.nbt
+
+public fun NBTInput.readStringTag(): String {
+    val length = readShort().toInt() and 0xFFFF
+    val bytes = readBytes(length)
+    return bytes.decodeToString()
+}
+
+public fun NBTInput.readListTag(): NBTTag.ListTag {
+    val elementTypeId = readByte().toInt() and 0xFF
+    val elementType = NBTType.fromId(elementTypeId)
+    val length = readInt()
+    val list = ArrayList<NBTTag>(length)
+    repeat(length) { list += readTagPayload(elementType) }
+    return NBTTag.ListTag(elementType, list)
+}
+
+public fun NBTInput.readCompoundTag(): NBTTag.CompoundTag {
+    val map = LinkedHashMap<String, NBTTag>()
+    while (true) {
+        val typeId = readByte().toInt() and 0xFF
+        if (typeId == 0) break // TAG_End
+        val name = readStringTag()
+        val type = NBTType.fromId(typeId)
+        val payload = readTagPayload(type)
+        map[name] = payload
+    }
+    return NBTTag.CompoundTag(map)
+}
+
+public fun NBTInput.readTagPayload(type: NBTType): NBTTag =
+    when (type) {
+        NBTType.Byte -> NBTTag.ByteTag(readByte())
+        NBTType.Short -> NBTTag.ShortTag(readShort())
+        NBTType.Int -> NBTTag.IntTag(readInt())
+        NBTType.Long -> NBTTag.LongTag(readLong())
+        NBTType.Float -> NBTTag.FloatTag(readFloat())
+        NBTType.Double -> NBTTag.DoubleTag(readDouble())
+        NBTType.String -> NBTTag.StringTag(readStringTag())
+        NBTType.ByteArray -> NBTTag.ByteArrayTag(readBytes(readInt()))
+        NBTType.IntArray -> NBTTag.IntArrayTag(IntArray(readInt()) { readInt() })
+        NBTType.LongArray -> NBTTag.LongArrayTag(LongArray(readInt()) { readLong() })
+        NBTType.List -> readListTag()
+        NBTType.Compound -> readCompoundTag()
+        NBTType.End -> error("TAG_End no payload")
+    }
+
+public fun NBTInput.readCompound(): NBTTag {
+    val map = LinkedHashMap<String, NBTTag>()
+    while (true) {
+        val typeId = readByte().toInt()
+        val type = NBTType.fromId(typeId)
+        if (type == NBTType.End) break
+        val nameLen = readShort().toInt() and 0xFFFF
+        val nameBytes = readBytes(nameLen)
+        val name = nameBytes.decodeToString()
+        val value = readTagPayload(type)
+        map[name] = value
+    }
+    return NBTTag.ListTag(NBTType.Compound, map.values.toMutableList())
+}
+
+public fun NBTInput.readRootCompound(): NBTCompound {
+    val rootType = NBTType.fromId(readByte().toInt())
+    require(rootType == NBTType.Compound) { "Root tag must be TAG_Compound" }
+    val nameLen = readShort().toInt() and 0xFFFF
+    val name = readBytes(nameLen).decodeToString()
+    val root = readCompound()
+    return NBTCompound(name, root)
+}
+
+public fun NBTInput.readNetworkCompound(): NBTCompound {
+    val root = readCompound()
+    return NBTCompound("", root)
+}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/NBTTag.kt

@@ -0,0 +1,77 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/1/25
+ */
+
+
+package cn.rtast.libmc.nbt
+
+public sealed class NBTTag(public val type: NBTType) {
+    public data class ByteTag(val value: Byte) : NBTTag(NBTType.Byte)
+    public data class ShortTag(val value: Short) : NBTTag(NBTType.Short)
+    public data class IntTag(val value: Int) : NBTTag(NBTType.Int)
+    public data class LongTag(val value: Long) : NBTTag(NBTType.Long)
+    public data class FloatTag(val value: Float) : NBTTag(NBTType.Float)
+    public data class DoubleTag(val value: Double) : NBTTag(NBTType.Double)
+    public data class StringTag(val value: String) : NBTTag(NBTType.String)
+    public data class CompoundTag(val value: MutableMap<String, NBTTag>) : NBTTag(NBTType.Compound)
+    public data class ListTag(val elementType: NBTType, val value: MutableList<NBTTag>) : NBTTag(NBTType.List) {
+        public val length: Int get() = value.size
+    }
+
+    public data class IntArrayTag(val value: IntArray) : NBTTag(NBTType.IntArray) {
+        public val length: Int get() = value.size
+        override fun equals(other: Any?): Boolean {
+            if (this === other) return true
+            if (other == null || this::class != other::class) return false
+            other as IntArrayTag
+            if (!value.contentEquals(other.value)) return false
+            if (length != other.length) return false
+            return true
+        }
+
+        override fun hashCode(): Int {
+            var result = value.contentHashCode()
+            result = 31 * result + length
+            return result
+        }
+    }
+
+    public data class LongArrayTag(val value: LongArray) : NBTTag(NBTType.LongArray) {
+        public val length: Int get() = value.size
+        override fun equals(other: Any?): Boolean {
+            if (this === other) return true
+            if (other == null || this::class != other::class) return false
+            other as LongArrayTag
+            if (!value.contentEquals(other.value)) return false
+            if (length != other.length) return false
+            return true
+        }
+
+        override fun hashCode(): Int {
+            var result = value.contentHashCode()
+            result = 31 * result + length
+            return result
+        }
+
+    }
+
+    public data class ByteArrayTag(val value: ByteArray) : NBTTag(NBTType.ByteArray) {
+        public val length: Int get() = value.size
+        override fun equals(other: Any?): Boolean {
+            if (this === other) return true
+            if (other == null || this::class != other::class) return false
+            other as ByteArrayTag
+            if (!value.contentEquals(other.value)) return false
+            if (length != other.length) return false
+            return true
+        }
+
+        override fun hashCode(): Int {
+            var result = value.contentHashCode()
+            result = 31 * result + length
+            return result
+        }
+    }
+}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/NBTType.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/1/25
+ */
+
+
+package cn.rtast.libmc.nbt
+
+public enum class NBTType(public val id: Byte) {
+    End(0), Byte(1), Short(2), Int(3),
+    Long(4), Float(5), Double(6), ByteArray(7),
+    String(8), List(9), Compound(10),
+    IntArray(11), LongArray(12);
+
+    public companion object {
+        public fun fromId(id: Int): NBTType =
+            entries.firstOrNull { it.id.toInt() == id } ?: error("Unknown NBT type id: $id")
+    }
+}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/NBTWriter.kt

@@ -0,0 +1,64 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/1/25
+ */
+
+
+package cn.rtast.libmc.nbt
+
+
+public fun NBTOutput.writeStringTag(value: String) {
+    val bytes = value.encodeToByteArray()
+    writeShort(bytes.size.toShort())
+    writeBytes(bytes)
+}
+
+public fun NBTOutput.writeTagPayload(tag: NBTTag) {
+    when (tag) {
+        is NBTTag.ByteTag -> writeByte(tag.value)
+        is NBTTag.ShortTag -> writeShort(tag.value)
+        is NBTTag.IntTag -> writeInt(tag.value)
+        is NBTTag.LongTag -> writeLong(tag.value)
+        is NBTTag.FloatTag -> writeInt(tag.value.toBits())
+        is NBTTag.DoubleTag -> writeLong(tag.value.toBits())
+        is NBTTag.StringTag -> writeStringTag(tag.value)
+
+        is NBTTag.ByteArrayTag -> {
+            writeInt(tag.length)
+            writeBytes(tag.value)
+        }
+
+        is NBTTag.IntArrayTag -> {
+            writeInt(tag.length)
+            tag.value.forEach { writeInt(it) }
+        }
+
+        is NBTTag.LongArrayTag -> {
+            writeInt(tag.length)
+            tag.value.forEach { writeLong(it) }
+        }
+
+        is NBTTag.ListTag -> {
+            writeByte(tag.elementType.id)
+            writeInt(tag.length)
+            tag.value.forEach { writeTagPayload(it) }
+        }
+
+        is NBTTag.CompoundTag -> {
+            for ((name, value) in tag.value) {
+                writeByte(value.type.id)
+                writeStringTag(name)
+                writeTagPayload(value)
+            }
+            writeByte(NBTType.End.id)
+        }
+    }
+}
+
+public fun NBTOutput.writeRootNBTCompound(name: String = ""): ByteArray {
+    writeByte(NBTType.Compound.id)
+    writeStringTag(name)
+    writeTagPayload(root)
+    return toByteArray()
+}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/NbtCompressor.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/1/25
+ */
+
+
+package cn.rtast.libmc.nbt
+
+import cn.rtast.libmc.common.gzipCompress
+import cn.rtast.libmc.common.gzipDecompress
+import cn.rtast.libmc.common.zlibCompress
+import cn.rtast.libmc.common.zlibDecompress
+
+public sealed interface NbtCompressor {
+    public fun compress(input: ByteArray): ByteArray
+    public fun decompress(input: ByteArray): ByteArray
+
+    public object GZipCompressor : NbtCompressor {
+        override fun compress(input: ByteArray): ByteArray = input.gzipCompress()
+        override fun decompress(input: ByteArray): ByteArray = input.gzipDecompress()
+    }
+
+    public object ZlibCompressor : NbtCompressor {
+        override fun compress(input: ByteArray): ByteArray = input.zlibCompress()
+        override fun decompress(input: ByteArray): ByteArray = input.zlibDecompress()
+    }
+}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/nbt_reader.kt

@@ -1,95 +0,0 @@
-/*
- * Copyright © 2026 RTAkland
- * Author: RTAkland
- * Date: 2026/9/4
- */
-
-
-package cn.rtast.libmc.nbt
-
-import cn.rtast.libmc.common._Buffer
-import cn.rtast.libmc.common.readVarInt
-
-public class NbtReader(
-    private val buffer: _Buffer,
-    private val variant: NbtVariant = NbtVariant.JAVA,
-) {
-    private fun readShort(): Short = buffer.readShort(variant.order)
-    private fun readInt(): Int = buffer.readInt(variant.order)
-    private fun readLong(): Long = buffer.readLong(variant.order)
-    private fun readFloat(): Float = Float.fromBits(readInt())
-    private fun readDouble(): Double = Double.fromBits(readLong())
-
-    private fun readString(): String {
-        val length = if (variant.isNetwork) buffer.readVarInt() else readShort().toInt() and 0xFFFF
-        if (length == 0) return ""
-        return buffer.readBytes(length).decodeToString()
-    }
-
-    private fun readTagType(): Byte = if (variant.isNetwork) buffer.readVarInt().toByte() else buffer.readByte()
-
-    public fun readRoot(): Pair<String, NbtCompound> {
-        val type = readTagType()
-        require(type == NBTType.COMPOUND) { "Expected Compound Tag (10), got $type" }
-        val name = readString()
-        val root = readCompound()
-        return name to root
-    }
-
-    private fun readCompound(): NbtCompound {
-        val map = mutableMapOf<String, NBTElement>()
-        while (true) {
-            val type = readTagType()
-            if (type == NBTType.END) break
-
-            val name = readString()
-            map[name] = readPayload(type)
-        }
-        return NbtCompound(map)
-    }
-
-    private fun readList(): NbtList {
-        val elementType = readTagType()
-        val size = if (variant.isNetwork) buffer.readVarInt() else readInt()
-        if (size <= 0) return NbtList(elementType, emptyList())
-        val list = mutableListOf<NBTElement>()
-        (0 until size).forEach { _ -> list.add(readPayload(elementType)) }
-        return NbtList(elementType, list)
-    }
-
-    private fun readPayload(type: Byte): NBTElement {
-        return when (type) {
-            NBTType.BYTE -> NbtByte(buffer.readByte())
-            NBTType.SHORT -> NbtShort(readShort())
-            NBTType.INT -> {
-                val value = if (variant.isNetwork) buffer.readVarInt().decodeZigZag() else readInt()
-                NbtInt(value)
-            }
-
-            NBTType.LONG -> NbtLong(readLong())
-            NBTType.FLOAT -> NbtFloat(readFloat())
-            NBTType.DOUBLE -> NbtDouble(readDouble())
-            NBTType.BYTE_ARRAY -> {
-                val len = if (variant.isNetwork) buffer.readVarInt() else readInt()
-                NbtByteArray(buffer.readBytes(len))
-            }
-
-            NBTType.STRING -> NbtString(readString())
-            NBTType.LIST -> readList()
-            NBTType.COMPOUND -> readCompound()
-            NBTType.INT_ARRAY -> {
-                val len = if (variant.isNetwork) buffer.readVarInt() else readInt()
-                val array = IntArray(len) { readInt() }
-                NbtIntArray(array)
-            }
-
-            NBTType.LONG_ARRAY -> {
-                val len = if (variant.isNetwork) buffer.readVarInt() else readInt()
-                val array = LongArray(len) { readLong() }
-                NbtLongArray(array)
-            }
-
-            else -> throw IllegalArgumentException("Unknown Tag type: $type")
-        }
-    }
-}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/nbt_tags.kt

@@ -1,66 +0,0 @@
-/*
- * Copyright © 2026 RTAkland
- * Author: RTAkland
- * Date: 2026/9/4
- */
-
-
-package cn.rtast.libmc.nbt
-
-public sealed interface NBTElement {
-    public val typeId: NBTTypeID
-}
-
-public data class NbtByte(val value: Byte) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.BYTE
-}
-
-public data class NbtShort(val value: Short) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.SHORT
-}
-
-public data class NbtInt(val value: Int) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.INT
-}
-
-public data class NbtLong(val value: Long) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.LONG
-}
-
-public data class NbtFloat(val value: Float) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.FLOAT
-}
-
-public data class NbtDouble(val value: Double) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.DOUBLE
-}
-
-public data class NbtByteArray(val value: ByteArray) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.BYTE_ARRAY
-    override fun equals(other: Any?): Boolean = other is NbtByteArray && value.contentEquals(other.value)
-    override fun hashCode(): Int = value.contentHashCode()
-}
-
-public data class NbtString(val value: String) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.STRING
-}
-
-public data class NbtList(val elementType: Byte, val elements: List<NBTElement>) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.LIST
-}
-
-public data class NbtCompound(val map: Map<String, NBTElement>) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.COMPOUND
-}
-
-public data class NbtIntArray(val value: IntArray) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.INT_ARRAY
-    override fun equals(other: Any?): Boolean = other is NbtIntArray && value.contentEquals(other.value)
-    override fun hashCode(): Int = value.contentHashCode()
-}
-
-public data class NbtLongArray(val value: LongArray) : NBTElement {
-    override val typeId: NBTTypeID = NBTType.LONG_ARRAY
-    override fun equals(other: Any?): Boolean = other is NbtLongArray && value.contentEquals(other.value)
-    override fun hashCode(): Int = value.contentHashCode()
-}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/nbt_type.kt

@@ -1,26 +0,0 @@
-/*
- * Copyright © 2026 RTAkland
- * Author: RTAkland
- * Date: 2026/9/4
- */
-
-
-package cn.rtast.libmc.nbt
-
-public typealias NBTTypeID = Byte
-
-public object NBTType {
-    public const val END: NBTTypeID = 0
-    public const val BYTE: NBTTypeID = 1
-    public const val SHORT: NBTTypeID = 2
-    public const val INT: NBTTypeID = 3
-    public const val LONG: NBTTypeID = 4
-    public const val FLOAT: NBTTypeID = 5
-    public const val DOUBLE: NBTTypeID = 6
-    public const val BYTE_ARRAY: NBTTypeID = 7
-    public const val STRING: NBTTypeID = 8
-    public const val LIST: NBTTypeID = 9
-    public const val COMPOUND: NBTTypeID = 10
-    public const val INT_ARRAY: NBTTypeID = 11
-    public const val LONG_ARRAY: NBTTypeID = 12
-}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/nbt_variant.kt

@@ -1,19 +0,0 @@
-/*
- * Copyright © 2026 RTAkland
- * Author: RTAkland
- * Date: 2026/9/4
- */
-
-
-package cn.rtast.libmc.nbt
-
-import cn.rtast.libmc.common.ByteOrder
-
-public enum class NbtVariant(
-    public val order: ByteOrder,
-    public val isNetwork: Boolean,
-) {
-    JAVA(ByteOrder.BIG_ENDIAN, isNetwork = false),
-    BEDROCK_DISK(ByteOrder.LITTLE_ENDIAN, isNetwork = false),
-    BEDROCK_NETWORK(ByteOrder.LITTLE_ENDIAN, isNetwork = true)
-}

libmc-nbt/src/commonMain/kotlin/cn/rtast/libmc/nbt/varint.kt

@@ -1,11 +0,0 @@
-/*
- * Copyright © 2026 RTAkland
- * Author: RTAkland
- * Date: 2026/9/4
- */
-
-
-package cn.rtast.libmc.nbt
-
-internal fun Int.decodeZigZag(): Int = (this ushr 1) xor -(this and 1)
-internal fun Int.encodeZigZag(): Int = (this shl 1) xor (this shr 31)

libmc-protocol/build.gradle.kts

@@ -19,6 +19,7 @@ kotlin {
     sourceSets {
         commonMain.dependencies {
             api(project(":common"))
+            api(project(":nbt"))
             api(libs.kotlinx.serialization.core)
             api(libs.kotlinx.serialization.json)
             api(libs.kotlinx.coroutines)

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/client/InternalPacketDispatcher.kt

@@ -9,9 +9,7 @@ package cn.rtast.libmc.protocol.client
 
 import cn.rtast.libmc.common.packet.MinecraftPacket
 import cn.rtast.libmc.protocol.packet.configuration.*
-import cn.rtast.libmc.protocol.packet.login.ClientboundDisconnectLoginPacket
-import cn.rtast.libmc.protocol.packet.login.ClientboundLoginSuccessPacket
-import cn.rtast.libmc.protocol.packet.login.ServerboundLoginAcknowledgedPacket
+import cn.rtast.libmc.protocol.packet.login.*
 import cn.rtast.libmc.protocol.packet.play.*
 import cn.rtast.libmc.protocol.protocol.state.ProtocolState
 
@@ -21,53 +19,75 @@ internal class InternalPacketDispatcher(private val client: MinecraftClient) {
     suspend fun handleIncomingPackets(packet: MinecraftPacket) {
         this.dispatchEvent(packet)
         when (packet) {
+            is ClientboundLoginPacket -> this.handleLoginPackets(packet)
+            is ClientboundConfigurationPacket -> this.handleConfigurationPackets(packet)
+            is ClientboundPlayPacket -> this.handlePlayPackets(packet)
+        }
+    }
+
+    private fun handleLoginPackets(packet: ClientboundLoginPacket) {
+        when (packet) {
+            is ClientboundDisconnectLoginPacket -> {
+                println("Login denied: ${packet.reason}")
+                client.close()
+            }
+
+            is ClientboundSetCompressionPacket -> client.networkChannel.setCompression(packet.threshold)
             is ClientboundLoginSuccessPacket -> {
                 client.networkChannel.sendPacket(ServerboundLoginAcknowledgedPacket)
                 client.stateMachine.transitionTo(ProtocolState.CONFIGURATION)
             }
+        }
+    }
 
-            is ClientboundDisconnectLoginPacket -> {
-                println("Login denied: ${packet.reason}")
-//                close()
+    private fun handleConfigurationPackets(packet: ClientboundConfigurationPacket) {
+        when (packet) {
+            is ClientboundCookieRequestPacket -> {
+                // TODO
             }
 
-            is ClientboundSelectKnownPacksPacket -> {
-                client.networkChannel.sendPacket(ServerboundSelectKnownPacksPacket(emptyList()))  // TODO empty resource packs list
-            }
-
-            is ClientboundPingPacket -> client.networkChannel.sendPacket(ServerboundPongPacket(packet.id))
-
-            is ClientboundKeepAliveConfigurationPacket -> {
-                client.networkChannel.sendPacket(ServerboundKeepAliveConfigurationPacket(packet.id))
-            }
-
-            is ClientboundFinishConfigurationPacket -> {
-                client.networkChannel.sendPacket(ServerboundAckFinishConfigurationPacket)
-                client.stateMachine.transitionTo(ProtocolState.PLAY)
+            is ClientboundCustomPayloadPacket -> {
+                // TODO
             }
 
             is ClientboundDisconnectConfigurationPacket -> {
                 println("Configuration disconnected: ${packet.reason}")
-//                close()
             }
 
-            is ClientboundLoginPlayPacket -> {
-                println("Successfully joined world! Entity ID: ${packet.entityId}")
+            ClientboundFinishConfigurationPacket -> {
+                client.networkChannel.sendPacket(ServerboundAckFinishConfigurationPacket)
+                client.stateMachine.transitionTo(ProtocolState.PLAY)
             }
 
-            is ClientboundKeepAlivePlayPacket -> {
-                client.networkChannel.sendPacket(ServerboundKeepAlivePlayPacket(id = packet.id))
+            is ClientboundKeepAliveConfigurationPacket -> client.networkChannel.sendPacket(
+                ServerboundKeepAliveConfigurationPacket(packet.id)
+            )
+
+            is ClientboundPingConfigurationPacket -> client.networkChannel.sendPacket(
+                ServerboundPongConfigurationPacket(packet.id)
+            )
+
+            is ClientboundSelectKnownPacksPacket -> {
+                client.networkChannel.sendPacket(ServerboundSelectKnownPacksPacket(emptyList()))  // TODO empty resource packs list
+            }
+        }
+    }
+
+    private fun handlePlayPackets(packet: ClientboundPlayPacket) {
+        when (packet) {
+            is ClientboundDisconnectPlayPacket -> client.close()
+            is ClientboundKeepAlivePlayPacket -> client.networkChannel.sendPacket(ServerboundKeepAlivePlayPacket(id = packet.id))
+            is ClientboundLoginPlayPacket -> println("Successfully joined world Entity ID: ${packet.entityId}")
+            is ClientboundPingPlayPacket -> client.networkChannel.sendPacket(ServerboundPongPlayPacket(packet.id))
+            is ClientboundPlayerChatMessagePacket -> {
+                println("Received player chat message $packet")
+                // TODO
             }
 
-            is ClientboundStartConfigurationPacket -> {
+            ClientboundStartConfigurationPacket -> {
                 client.networkChannel.sendPacket(ServerboundConfigurationAcknowledgedPacket)
                 client.stateMachine.transitionTo(ProtocolState.CONFIGURATION)
             }
-
-            is ClientboundDisconnectPlayPacket -> {
-                println("Disconnected from play session: ${packet.reason}")
-//                close()
-            }
         }
     }
 }

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/network/NetworkChannel.kt

@@ -10,6 +10,7 @@ import cn.rtast.libmc.common.*
 import cn.rtast.libmc.common.packet.MinecraftPacket
 import cn.rtast.libmc.protocol.client.ClientStateMachine
 import cn.rtast.libmc.protocol.protocol.GameProtocols
+import kotlin.concurrent.Volatile
 
 internal class NetworkChannel(
     private val host: String,
@@ -20,6 +21,8 @@ internal class NetworkChannel(
     private var socket: Socket? = null
     private var readChannel: ReadChannel? = null
     private var writeChannel: WriteChannel? = null
+
+    @Volatile
     private var threshold = -1
 
     fun connect() {
@@ -37,46 +40,43 @@ internal class NetworkChannel(
         val channel = requireNotNull(readChannel) { "ReadChannel not connected" }
         val packetLength = channel.readVarInt()
         val rawFrameBytes = channel.readBytes(packetLength)
-        val payloadBuf = if (threshold < 0) rawFrameBytes.wrap() else {
-            val frameBuf = rawFrameBytes.wrap()
+        val frameBuf = rawFrameBytes.wrap()
+        val payloadBuf = if (threshold < 0) frameBuf else {
             val dataLength = frameBuf.readVarInt()
-            if (dataLength == 0) {
-                frameBuf.readBytes(frameBuf.remaining.toInt()).wrap()
-            } else frameBuf.readBytes(frameBuf.remaining.toInt()).zlibDecompress(dataLength).wrap()
+            val remainingBytes = frameBuf.readBytes(frameBuf.remaining.toInt())
+            if (dataLength == 0) remainingBytes.wrap() else remainingBytes.zlibDecompress(dataLength).wrap()
         }
-
         val currentState = stateMachine.currentState
         val packetId = payloadBuf.readVarInt()
-        return GameProtocols.clientboundGameProtocols.getRegistry(currentState).decodePacket(packetId, payloadBuf)
+        val packet = GameProtocols.clientboundGameProtocols
+            .getRegistry(currentState)
+            .decodePacket(packetId, payloadBuf)
+        return packet
     }
 
     fun sendPacket(packet: MinecraftPacket) {
         val channel = requireNotNull(writeChannel) { "WriteChannel not connected" }
-        val bodyBuffer = BytesBuffer()
-        GameProtocols.serverboundGameProtocols.getRegistry(stateMachine.currentState).encodePacket(bodyBuffer, packet)
-        val frameBuffer = BytesBuffer().apply {
-            if (threshold < 0) {
-                writeVarInt(bodyBuffer.size)
-                writeBuffer(bodyBuffer)
+        val uncompressedBodyBuf = BytesBuffer()
+        GameProtocols.serverboundGameProtocols
+            .getRegistry(stateMachine.currentState)
+            .encodePacket(uncompressedBodyBuf, packet)
+        val uncompressedData = uncompressedBodyBuf.toByteArray()
+        val frameBuffer = BytesBuffer()
+        if (threshold < 0) {
+            frameBuffer.writeVarInt(uncompressedData.size)
+            frameBuffer.writeBytes(uncompressedData)
+        } else {
+            val contentBuf = BytesBuffer()
+            if (uncompressedData.size < threshold) {
+                contentBuf.writeVarInt(0)
+                contentBuf.writeBytes(uncompressedData)
             } else {
-                val uncompressedData = bodyBuffer.toByteArray()
-                if (uncompressedData.size < threshold) {
-                    val contentBuf = BytesBuffer().apply {
-                        writeVarInt(0)
-                        writeBytes(uncompressedData)
-                    }
-                    writeVarInt(contentBuf.size)
-                    writeBuffer(contentBuf)
-                } else {
-                    val compressedData = uncompressedData.zlibCompress()
-                    val contentBuf = BytesBuffer().apply {
-                        writeVarInt(uncompressedData.size)
-                        writeBytes(compressedData)
-                    }
-                    writeVarInt(contentBuf.size)
-                    writeBuffer(contentBuf)
-                }
+                val compressedData = uncompressedData.zlibCompress()
+                contentBuf.writeVarInt(uncompressedData.size)
+                contentBuf.writeBytes(compressedData)
             }
+            frameBuffer.writeVarInt(contentBuf.size)
+            frameBuffer.writeBuffer(contentBuf)
         }
         channel.writeFully(frameBuffer.toByteArray())
         channel.flush()

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/configuration/ClientboundConfigurationPacket.kt

@@ -0,0 +1,12 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/9/5
+ */
+
+
+package cn.rtast.libmc.protocol.packet.configuration
+
+import cn.rtast.libmc.common.packet.MinecraftPacket
+
+public sealed interface ClientboundConfigurationPacket : MinecraftPacket

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/configuration/ClientboundCookieRequestPacket.kt

@@ -9,12 +9,11 @@ package cn.rtast.libmc.protocol.packet.configuration
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 import cn.rtast.libmc.protocol.protocol.game.Identifier
 import cn.rtast.libmc.protocol.protocol.game.readIdentifier
 import cn.rtast.libmc.protocol.protocol.game.writeIdentifier
 
-public data class ClientboundCookieRequestPacket(val key: Identifier) : MinecraftPacket {
+public data class ClientboundCookieRequestPacket(val key: Identifier) : ClientboundConfigurationPacket {
     public companion object Codec : PacketCodec<ClientboundCookieRequestPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundCookieRequestPacket) {
             buffer.writeIdentifier(value.key)

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/configuration/ClientboundCustomPayloadPacket.kt

@@ -9,12 +9,12 @@ package cn.rtast.libmc.protocol.packet.configuration
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 import cn.rtast.libmc.protocol.protocol.game.Identifier
 import cn.rtast.libmc.protocol.protocol.game.readIdentifier
 import cn.rtast.libmc.protocol.protocol.game.writeIdentifier
 
-public data class ClientboundCustomPayloadPacket(val channel: Identifier, val data: ByteArray) : MinecraftPacket {
+public data class ClientboundCustomPayloadPacket(val channel: Identifier, val data: ByteArray) :
+    ClientboundConfigurationPacket {
     public companion object Codec : PacketCodec<ClientboundCustomPayloadPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundCustomPayloadPacket) {
             buffer.writeIdentifier(value.channel)

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/configuration/ClientboundDisconnectConfigurationPacket.kt

@@ -7,17 +7,16 @@
 
 package cn.rtast.libmc.protocol.packet.configuration
 
-import cn.rtast.libmc.protocol.util.readMinimalTextNbt
-import cn.rtast.libmc.common.packet.MinecraftPacket
-import cn.rtast.libmc.common.PacketCodec
 import cn.rtast.libmc.common.BytesBuffer
+import cn.rtast.libmc.common.PacketCodec
+import cn.rtast.libmc.nbt.NBTCompound
+import cn.rtast.libmc.protocol.protocol.util.readNetworkNBTCompound
 
-public data class ClientboundDisconnectConfigurationPacket(val reason: String) : MinecraftPacket {
+public data class ClientboundDisconnectConfigurationPacket(val reason: NBTCompound) : ClientboundConfigurationPacket {
     public companion object Codec : PacketCodec<ClientboundDisconnectConfigurationPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundDisconnectConfigurationPacket) {}
         override fun decode(buffer: BytesBuffer): ClientboundDisconnectConfigurationPacket {
-            val reasonText = buffer.readMinimalTextNbt()
-            return ClientboundDisconnectConfigurationPacket(reason = reasonText)
+            return ClientboundDisconnectConfigurationPacket(reason = buffer.readNetworkNBTCompound())
         }
     }
 }

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/configuration/ClientboundFinishConfigurationPacket.kt

@@ -9,9 +9,8 @@ package cn.rtast.libmc.protocol.packet.configuration
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 
-public data object ClientboundFinishConfigurationPacket : MinecraftPacket,
+public data object ClientboundFinishConfigurationPacket : ClientboundConfigurationPacket,
     PacketCodec<ClientboundFinishConfigurationPacket> {
     override fun encode(buffer: BytesBuffer, value: ClientboundFinishConfigurationPacket) {}
     override fun decode(buffer: BytesBuffer): ClientboundFinishConfigurationPacket {

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/configuration/ClientboundKeepAliveConfigurationPacket.kt

@@ -9,9 +9,8 @@ package cn.rtast.libmc.protocol.packet.configuration
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 
-public data class ClientboundKeepAliveConfigurationPacket(val id: Long) : MinecraftPacket {
+public data class ClientboundKeepAliveConfigurationPacket(val id: Long) : ClientboundConfigurationPacket {
     public companion object Codec : PacketCodec<ClientboundKeepAliveConfigurationPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundKeepAliveConfigurationPacket) {
             buffer.writeLong(value.id)

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/configuration/ClientboundPingConfigurationPacket.kt

@@ -9,14 +9,13 @@ package cn.rtast.libmc.protocol.packet.configuration
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 
-public data class ClientboundPingPacket(val id: Int) : MinecraftPacket {
-    public companion object Codec : PacketCodec<ClientboundPingPacket> {
-        override fun encode(buffer: BytesBuffer, value: ClientboundPingPacket) {
+public data class ClientboundPingConfigurationPacket(val id: Int) : ClientboundConfigurationPacket {
+    public companion object Codec : PacketCodec<ClientboundPingConfigurationPacket> {
+        override fun encode(buffer: BytesBuffer, value: ClientboundPingConfigurationPacket) {
             buffer.writeInt(value.id)
         }
 
-        override fun decode(buffer: BytesBuffer): ClientboundPingPacket = ClientboundPingPacket(buffer.readInt())
+        override fun decode(buffer: BytesBuffer): ClientboundPingConfigurationPacket = ClientboundPingConfigurationPacket(buffer.readInt())
     }
 }

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/configuration/ClientboundSelectKnownPacksPacket.kt

@@ -9,11 +9,10 @@ package cn.rtast.libmc.protocol.packet.configuration
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 import cn.rtast.libmc.common.readVarInt
 import cn.rtast.libmc.common.writeVarInt
 
-public data class ClientboundSelectKnownPacksPacket(val knownPacks: List<KnownPacks>) : MinecraftPacket {
+public data class ClientboundSelectKnownPacksPacket(val knownPacks: List<KnownPacks>) : ClientboundConfigurationPacket {
     public companion object Codec : PacketCodec<ClientboundSelectKnownPacksPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundSelectKnownPacksPacket) {
             buffer.writeVarInt(value.knownPacks.size)

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/configuration/KnownPacks.kt

@@ -7,13 +7,11 @@
 
 package cn.rtast.libmc.protocol.packet.configuration
 
-import cn.rtast.libmc.common.PacketCodec
 import cn.rtast.libmc.common.BytesBuffer
+import cn.rtast.libmc.common.PacketCodec
 import cn.rtast.libmc.common.readMcString
 import cn.rtast.libmc.common.writeMcString
-import kotlinx.serialization.Serializable
 
-@Serializable
 public data class KnownPacks(val namespace: String, val id: String, val version: String) {
     public companion object Codec : PacketCodec<KnownPacks> {
         override fun encode(buffer: BytesBuffer, value: KnownPacks) {

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/configuration/ServerboundPongConfigurationPacket.kt

@@ -11,12 +11,12 @@ import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
 import cn.rtast.libmc.common.packet.MinecraftPacket
 
-public data class ServerboundPongPacket(val id: Int) : MinecraftPacket {
-    public companion object Codec : PacketCodec<ServerboundPongPacket> {
-        override fun encode(buffer: BytesBuffer, value: ServerboundPongPacket) {
+public data class ServerboundPongConfigurationPacket(val id: Int) : MinecraftPacket {
+    public companion object Codec : PacketCodec<ServerboundPongConfigurationPacket> {
+        override fun encode(buffer: BytesBuffer, value: ServerboundPongConfigurationPacket) {
             buffer.writeInt(value.id)
         }
 
-        override fun decode(buffer: BytesBuffer): ServerboundPongPacket = ServerboundPongPacket(buffer.readInt())
+        override fun decode(buffer: BytesBuffer): ServerboundPongConfigurationPacket = ServerboundPongConfigurationPacket(buffer.readInt())
     }
 }

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/login/ClientboundDisconnectLoginPacket.kt

@@ -9,10 +9,9 @@ package cn.rtast.libmc.protocol.packet.login
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 import cn.rtast.libmc.common.readMcString
 
-public data class ClientboundDisconnectLoginPacket(val reason: String) : MinecraftPacket {
+public data class ClientboundDisconnectLoginPacket(val reason: String) : ClientboundLoginPacket {
     public companion object Codec : PacketCodec<ClientboundDisconnectLoginPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundDisconnectLoginPacket) {}
         override fun decode(buffer: BytesBuffer): ClientboundDisconnectLoginPacket {

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/login/ClientboundLoginPacket.kt

@@ -0,0 +1,12 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/9/5
+ */
+
+
+package cn.rtast.libmc.protocol.packet.login
+
+import cn.rtast.libmc.common.packet.MinecraftPacket
+
+public sealed interface ClientboundLoginPacket : MinecraftPacket

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/login/ClientboundLoginSuccessPacket.kt

@@ -9,12 +9,12 @@ package cn.rtast.libmc.protocol.packet.login
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 import cn.rtast.libmc.common.readUuid
 import cn.rtast.libmc.protocol.profile.GameProfile
 import kotlin.uuid.Uuid
 
-public data class ClientboundLoginSuccessPacket(val gameProfile: GameProfile, val sessionId: Uuid) : MinecraftPacket {
+public data class ClientboundLoginSuccessPacket(val gameProfile: GameProfile, val sessionId: Uuid) :
+    ClientboundLoginPacket {
     public companion object Codec : PacketCodec<ClientboundLoginSuccessPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundLoginSuccessPacket) {}
         override fun decode(buffer: BytesBuffer): ClientboundLoginSuccessPacket {

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/login/ClientboundSetCompressionPacket.kt

@@ -9,11 +9,10 @@ package cn.rtast.libmc.protocol.packet.login
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 import cn.rtast.libmc.common.readVarInt
 import cn.rtast.libmc.common.writeVarInt
 
-public data class ClientboundSetCompressionPacket(val threshold: Int) : MinecraftPacket {
+public data class ClientboundSetCompressionPacket(val threshold: Int) : ClientboundLoginPacket {
     public companion object Codec : PacketCodec<ClientboundSetCompressionPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundSetCompressionPacket) {
             buffer.writeVarInt(value.threshold)

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/login/ServerboundLoginAcknowledgedPacket.kt

@@ -13,7 +13,6 @@ import cn.rtast.libmc.common.packet.MinecraftPacket
 
 public data object ServerboundLoginAcknowledgedPacket : MinecraftPacket,
     PacketCodec<ServerboundLoginAcknowledgedPacket> {
-
     override fun encode(buffer: BytesBuffer, value: ServerboundLoginAcknowledgedPacket) {}
     override fun decode(buffer: BytesBuffer): ServerboundLoginAcknowledgedPacket = throw UnsupportedOperationException()
 }

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/play/ClientboundDisconnectPlayPacket.kt

@@ -7,17 +7,16 @@
 
 package cn.rtast.libmc.protocol.packet.play
 
-import cn.rtast.libmc.protocol.util.readMinimalTextNbt
-import cn.rtast.libmc.common.packet.MinecraftPacket
-import cn.rtast.libmc.common.PacketCodec
 import cn.rtast.libmc.common.BytesBuffer
+import cn.rtast.libmc.common.PacketCodec
+import cn.rtast.libmc.nbt.NBTCompound
+import cn.rtast.libmc.protocol.protocol.util.readNetworkNBTCompound
 
-public data class ClientboundDisconnectPlayPacket(val reason: String) : MinecraftPacket {
+public data class ClientboundDisconnectPlayPacket(val reason: NBTCompound) : ClientboundPlayPacket {
     public companion object Codec : PacketCodec<ClientboundDisconnectPlayPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundDisconnectPlayPacket) {}
         override fun decode(buffer: BytesBuffer): ClientboundDisconnectPlayPacket {
-            val reasonText = buffer.readMinimalTextNbt()
-            return ClientboundDisconnectPlayPacket(reason = reasonText)
+            return ClientboundDisconnectPlayPacket(reason = buffer.readNetworkNBTCompound())
         }
     }
 }

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/play/ClientboundKeepAlivePlayPacket.kt

@@ -9,9 +9,8 @@ package cn.rtast.libmc.protocol.packet.play
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 
-public data class ClientboundKeepAlivePlayPacket(val id: Long) : MinecraftPacket {
+public data class ClientboundKeepAlivePlayPacket(val id: Long) : ClientboundPlayPacket {
     public companion object Codec : PacketCodec<ClientboundKeepAlivePlayPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundKeepAlivePlayPacket) {
             buffer.writeLong(value.id)

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/play/ClientboundLoginPlayPacket.kt

@@ -7,15 +7,10 @@
 
 package cn.rtast.libmc.protocol.packet.play
 
-import cn.rtast.libmc.common.packet.MinecraftPacket
-import cn.rtast.libmc.common.PacketCodec
 import cn.rtast.libmc.common.BytesBuffer
+import cn.rtast.libmc.common.PacketCodec
 import cn.rtast.libmc.common.readVarInt
-import cn.rtast.libmc.protocol.protocol.game.BlockPos
-import cn.rtast.libmc.protocol.protocol.game.GameMode
-import cn.rtast.libmc.protocol.protocol.game.Identifier
-import cn.rtast.libmc.protocol.protocol.game.readBlockPos
-import cn.rtast.libmc.protocol.protocol.game.readIdentifier
+import cn.rtast.libmc.protocol.protocol.game.*
 
 public data class ClientboundLoginPlayPacket(
     val entityId: Int,
@@ -41,7 +36,7 @@ public data class ClientboundLoginPlayPacket(
     val seaLevel: Int,
     val isOnlineMode: Boolean,
     val enforceSecureChat: Boolean,
-) : MinecraftPacket {
+) : ClientboundPlayPacket {
     public companion object Codec : PacketCodec<ClientboundLoginPlayPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundLoginPlayPacket) {}
         override fun decode(buffer: BytesBuffer): ClientboundLoginPlayPacket {

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/play/ClientboundPingPlayPacket.kt

@@ -9,9 +9,8 @@ package cn.rtast.libmc.protocol.packet.play
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 
-public data class ClientboundPingPlayPacket(val id: Int) : MinecraftPacket {
+public data class ClientboundPingPlayPacket(val id: Int) : ClientboundPlayPacket {
     public companion object Codec : PacketCodec<ClientboundPingPlayPacket> {
         override fun encode(buffer: BytesBuffer, value: ClientboundPingPlayPacket) {
             buffer.writeInt(value.id)

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/play/ClientboundPlayPacket.kt

@@ -0,0 +1,12 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/9/5
+ */
+
+
+package cn.rtast.libmc.protocol.packet.play
+
+import cn.rtast.libmc.common.packet.MinecraftPacket
+
+public sealed interface ClientboundPlayPacket : MinecraftPacket

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/play/ClientboundPlayerChatMessagePacket.kt

@@ -8,10 +8,13 @@
 package cn.rtast.libmc.protocol.packet.play
 
 import cn.rtast.libmc.common.*
-import cn.rtast.libmc.common.packet.MinecraftPacket
-import cn.rtast.libmc.protocol.util.writeMinimalTextNbt
+import cn.rtast.libmc.nbt.NBTCompound
+import cn.rtast.libmc.protocol.protocol.util.readNetworkNBTCompound
 import kotlin.uuid.Uuid
 
+/**
+ * ref: https://minecraft.wiki/w/Java_Edition_protocol/Packets#Player_Chat_Message
+ */
 public data class ClientboundPlayerChatMessagePacket(
     val globalIndex: Int,
     val sender: Uuid,
@@ -21,13 +24,13 @@ public data class ClientboundPlayerChatMessagePacket(
     val timestamp: Long,
     val salt: Long,
     val previousMessages: List<PreviousMessageEntry>,
-    val unsignedContent: String?,
+    val unsignedContent: NBTCompound?,
     val filterType: ChatFilterType,
     val filterMaskBits: LongArray?,
     val chatType: Int,
-    val senderName: String,
-    val targetName: String?,
-) : MinecraftPacket {
+    val senderName: NBTCompound,
+    val targetName: NBTCompound?,
+) : ClientboundPlayPacket {
     public enum class ChatFilterType(public val id: Int) {
         PASS_THROUGH(0),
         FULLY_FILTERED(1),
@@ -39,32 +42,22 @@ public data class ClientboundPlayerChatMessagePacket(
         }
     }
 
-    public data class PreviousMessageEntry(
-        val messageId: Int,
-        val signature: ByteArray?,
-    ) {
+    public data class PreviousMessageEntry(val messageId: Int, val signature: ByteArray?) {
         public companion object Codec : PacketCodec<PreviousMessageEntry> {
-            override fun encode(buffer: BytesBuffer, value: PreviousMessageEntry) {
-                buffer.writeVarInt(value.messageId)
-                if (value.messageId == 0) {
-                    val sig = requireNotNull(value.signature) { "signature must be present when messageId is 0" }
-                    require(sig.size == 256)
-                    buffer.writeBytes(sig)
-                }
+            override fun encode(buffer: BytesBuffer, value: PreviousMessageEntry) {}
+            override fun decode(buffer: BytesBuffer): PreviousMessageEntry {
+                val messageId = buffer.readVarInt()
+                val signature = if (messageId == 0) buffer.readBytes(256) else null
+                return PreviousMessageEntry(messageId, signature)
             }
-
-            override fun decode(buffer: BytesBuffer): PreviousMessageEntry = throw UnsupportedOperationException()  // TODO
         }
 
         override fun equals(other: Any?): Boolean {
             if (this === other) return true
             if (other == null || this::class != other::class) return false
-
             other as PreviousMessageEntry
-
             if (messageId != other.messageId) return false
             if (!signature.contentEquals(other.signature)) return false
-
             return true
         }
 
@@ -76,43 +69,46 @@ public data class ClientboundPlayerChatMessagePacket(
     }
 
     public companion object Codec : PacketCodec<ClientboundPlayerChatMessagePacket> {
-        override fun encode(buffer: BytesBuffer, value: ClientboundPlayerChatMessagePacket) {
-            buffer.writeVarInt(value.globalIndex)
-            buffer.writeUuid(value.sender)
-            buffer.writeVarInt(value.index)
-            val hasSignature = value.messageSignature != null
-            buffer.writeBoolean(hasSignature)
-            if (hasSignature) buffer.writeBytes(requireNotNull(value.messageSignature))
+        override fun encode(buffer: BytesBuffer, value: ClientboundPlayerChatMessagePacket) {}
+        override fun decode(buffer: BytesBuffer): ClientboundPlayerChatMessagePacket {
+            val globalIndex = buffer.readVarInt()
+            val sender = buffer.readUuid()
+            val index = buffer.readVarInt()
+            val hasSignature = buffer.readBoolean()
+            val messageSignature = if (hasSignature) buffer.readBytes(256) else null
 
-            buffer.writeMcString(value.message)
-            buffer.writeLong(value.timestamp)
-            buffer.writeLong(value.salt)
+            val message = buffer.readMcString()
+            val timestamp = buffer.readLong()
+            val salt = buffer.readLong()
 
-            require(value.previousMessages.size == 20)
-            buffer.writeVarInt(value.previousMessages.size)
-            value.previousMessages.forEach { entry -> PreviousMessageEntry.encode(buffer, entry) }
+            val prevMessageCount = buffer.readVarInt()
+            val prevMessages = List(prevMessageCount) { PreviousMessageEntry.decode(buffer) }
 
-            val hasUnsignedContent = value.unsignedContent != null
-            buffer.writeBoolean(hasUnsignedContent)
-            value.unsignedContent?.let { buffer.writeMinimalTextNbt(it) }
+            val hasUnsignedContent = buffer.readBoolean()
+            val unsignedContent = if (hasUnsignedContent) buffer.readNetworkNBTCompound() else null  // ?
 
-            buffer.writeVarInt(value.filterType.id)
-            if (value.filterType == ChatFilterType.PARTIALLY_FILTERED) {
-                val mask = requireNotNull(value.filterMaskBits)
-                buffer.writeVarInt(mask.size)
-                mask.forEach { buffer.writeLong(it) }
-            }
+            val filterTypeId = buffer.readVarInt()
+            val filterType = ChatFilterType.fromId(filterTypeId)
 
-            buffer.writeVarInt(value.chatType)
-            buffer.writeMinimalTextNbt(value.senderName)
+            val filterMaskBits = if (filterType == ChatFilterType.PARTIALLY_FILTERED) {
+                val bitSetLen = buffer.readVarInt()
+                LongArray(bitSetLen) { buffer.readLong() }
+            } else null
 
-            val hasTargetName = value.targetName != null
-            buffer.writeBoolean(hasTargetName)
-            value.targetName?.let { buffer.writeMinimalTextNbt(it) }
+            val chatType = buffer.readVarInt()
+            val senderName = buffer.readNetworkNBTCompound() // ?
+
+            val hasTargetName = buffer.readBoolean()
+            val targetName = if (hasTargetName) buffer.readNetworkNBTCompound() else null // ?
+            return ClientboundPlayerChatMessagePacket(
+                globalIndex, sender, index,
+                messageSignature, message,
+                timestamp, salt, prevMessages,
+                unsignedContent, filterType,
+                filterMaskBits, chatType,
+                senderName, targetName
+            )
         }
-
-        override fun decode(buffer: BytesBuffer): ClientboundPlayerChatMessagePacket =
-            throw UnsupportedOperationException()  // TODO
     }
 
     override fun equals(other: Any?): Boolean {

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/play/ClientboundStartConfigurationPacket.kt

@@ -9,9 +9,8 @@ package cn.rtast.libmc.protocol.packet.play
 
 import cn.rtast.libmc.common.BytesBuffer
 import cn.rtast.libmc.common.PacketCodec
-import cn.rtast.libmc.common.packet.MinecraftPacket
 
-public data object ClientboundStartConfigurationPacket : MinecraftPacket,
+public data object ClientboundStartConfigurationPacket : ClientboundPlayPacket,
     PacketCodec<ClientboundStartConfigurationPacket> {
     override fun encode(buffer: BytesBuffer, value: ClientboundStartConfigurationPacket) {}
     override fun decode(buffer: BytesBuffer): ClientboundStartConfigurationPacket {

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/protocol/GameProtocols.kt

@@ -25,7 +25,7 @@ internal object GameProtocols {
             register(0x02, ClientboundDisconnectConfigurationPacket)
             register(0x03, ClientboundFinishConfigurationPacket)
             register(0x04, ClientboundKeepAliveConfigurationPacket)
-            register(0x05, ClientboundPingPacket)
+            register(0x05, ClientboundPingConfigurationPacket)
             register(0x0e, ClientboundSelectKnownPacksPacket)
         }
         register(ProtocolState.LOGIN) {
@@ -34,6 +34,7 @@ internal object GameProtocols {
             register(0x03, ClientboundSetCompressionPacket)
         }
         register(ProtocolState.PLAY) {
+            register(0x20, ClientboundDisconnectPlayPacket)
             register(0x2c, ClientboundKeepAlivePlayPacket)
             register(0x31, ClientboundLoginPlayPacket)
             register(0x3d, ClientboundPingPlayPacket)
@@ -49,7 +50,7 @@ internal object GameProtocols {
         register(ProtocolState.CONFIGURATION) {
             register(0x03, ServerboundAckFinishConfigurationPacket)
             register(0x04, ServerboundKeepAliveConfigurationPacket)
-            register(0x05, ServerboundPongPacket)
+            register(0x05, ServerboundPongConfigurationPacket)
             register(0x07, ServerboundSelectKnownPacksPacket)
         }
         register(ProtocolState.LOGIN) {

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/protocol/game/GameMode.kt

@@ -17,7 +17,7 @@ public enum class GameMode(public val id: Byte) {
     /**
      * reserved
      */
-    Unknown(-99);
+    Unknown(-128);
 
     public companion object {
         public fun fromID(id: Byte): GameMode = entries.firstOrNull { it.id == id } ?: Unknown

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/protocol/game/Identifier.kt

@@ -7,19 +7,21 @@
 
 package cn.rtast.libmc.protocol.protocol.game
 
-import cn.rtast.libmc.common.PacketCodec
 import cn.rtast.libmc.common.BytesBuffer
+import cn.rtast.libmc.common.PacketCodec
 import cn.rtast.libmc.common.readMcString
 import cn.rtast.libmc.common.writeMcString
+import kotlinx.serialization.Serializable
 import kotlin.jvm.JvmInline
 
 /**
  * ref: https://minecraft.wiki/w/Java_Edition_protocol/Packets#Identifier
  */
 @JvmInline
-public value class Identifier(public val full: String) {
-    public val namespace: String get() = if (full.contains(':')) full.substringBefore(':') else "minecraft"
-    public val path: String get() = if (full.contains(':')) full.substringAfter(':') else full
+@Serializable
+public value class Identifier internal constructor(public val raw: String) {
+    public val namespace: String get() = if (raw.contains(':')) raw.substringBefore(':') else "minecraft"
+    public val path: String get() = if (raw.contains(':')) raw.substringAfter(':') else raw
 
     override fun toString(): String = "$namespace:$path"
 

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/protocol/util/nbt.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/9/5
+ */
+
+
+package cn.rtast.libmc.protocol.protocol.util
+
+import cn.rtast.libmc.common.BytesBuffer
+import cn.rtast.libmc.nbt.NBTCompound
+import cn.rtast.libmc.nbt.readNetworkCompound
+import cn.rtast.libmc.nbt.readRootCompound
+import cn.rtast.libmc.nbt.toNBTInput
+
+internal fun BytesBuffer.readNBTCompound(): NBTCompound =
+    this.toNBTInput().readRootCompound()
+
+internal fun BytesBuffer.readNetworkNBTCompound(): NBTCompound =
+    this.toNBTInput().readNetworkCompound()

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/util/nbt.kt

@@ -1,43 +0,0 @@
-/*
- * Copyright © 2026 RTAkland
- * Author: RTAkland
- * Date: 2026/9/4
- */
-
-
-package cn.rtast.libmc.protocol.util
-
-import cn.rtast.libmc.common.BytesBuffer
-
-/**
- * tmp
- */
-internal fun BytesBuffer.writeMinimalTextNbt(text: String) {
-    writeByte(0x0A)
-    writeByte(0x08)
-    val keyBytes = "text".encodeToByteArray()
-    writeShort(keyBytes.size.toShort())
-    writeBytes(keyBytes)
-    val valBytes = text.encodeToByteArray()
-    require(valBytes.size <= 32767)
-    writeShort(valBytes.size.toShort())
-    writeBytes(valBytes)
-    writeByte(0x00)
-}
-
-internal fun BytesBuffer.readMinimalTextNbt(): String {
-    val rootTagType = readByte().toInt()
-    if (rootTagType != 0x0A) return ""
-    var resultText = ""
-    while (true) {
-        val tagType = readByte().toInt()
-        if (tagType == 0x00) break
-        val keyLength = readShort().toInt()
-        val key = readBytes(keyLength).decodeToString()
-        if (tagType == 0x08 && key == "text") {
-            val valLength = readShort().toInt()
-            resultText = readBytes(valLength).decodeToString()
-        } else break
-    }
-    return resultText
-}

libmc-protocol/src/commonTest/kotlin/test/TestClient.kt

@@ -8,6 +8,7 @@
 package test
 
 import cn.rtast.libmc.protocol.client.createMinecraftClient
+import cn.rtast.libmc.protocol.packet.play.ClientboundLoginPlayPacket
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.runTest
 import kotlin.test.Test
@@ -19,6 +20,9 @@ class TestClient {
         val cli = createMinecraftClient("127.0.0.1", 25565, "123")
         cli.launch { cli.connect() }
 
+        cli.on<ClientboundLoginPlayPacket> {
+            println(it)
+        }
         while (true) {
         }
     }

libmc-rconlib/build.gradle.kts

@@ -14,7 +14,7 @@ kotlin {
 
     sourceSets {
         commonMain.dependencies {
-            implementation(project(":common"))
+            api(project(":common"))
         }
 
         jvmMain.dependencies {

libmc-snbt/build.gradle.kts

@@ -0,0 +1,29 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+kotlin {
+    explicitApi()
+    withSourcesJar()
+
+    linuxX64()
+    linuxArm64()
+    macosArm64()
+    mingwX64()
+    iosArm64()
+    iosSimulatorArm64()
+    jvm { compilerOptions.jvmTarget = JvmTarget.JVM_1_8 }
+
+    sourceSets {
+        commonMain.dependencies {
+            api(project(":common"))
+        }
+
+        jvmMain.dependencies {
+
+        }
+
+        commonTest.dependencies {
+            implementation(kotlin("test"))
+            implementation(libs.kotlinx.coroutines.test)
+        }
+    }
+}

settings.gradle.kts

@@ -7,8 +7,9 @@ includeSubModule(":common")
 includeSubModule(":mcping")
 includeSubModule(":rconlib")
 includeSubModule(":protocol")
-//includeSubModule(":nbt")
+includeSubModule(":nbt")
+includeSubModule(":snbt")
 
-fun includeSubModule(name: String) = include(name).also {
-    project(name).projectDir = file("libmc-${name.removePrefix(":")}")
+fun includeSubModule(name: String, path: String? = null) = include(name).also {
+    project(name).projectDir = file(path ?: "libmc-${name.removePrefix(":")}")
 }