Complete all serverbound packets at PLAY state

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

@@ -56,9 +56,52 @@ public fun BytesBuffer.readUuid(): Uuid {
 public fun BytesBuffer.writeVarInt(value: Int): Unit = VarIntCodec.encode(this, value)
 public fun BytesBuffer.readVarInt(): Int = VarIntCodec.decode(this)
 
+public fun BytesBuffer.writeVarLong(value: Long): Unit = VarLongCodec.encode(this, value)
+public fun BytesBuffer.readVarLong(): Long = VarLongCodec.decode(this)
+
 public fun BytesBuffer.writeMcString(value: String): Unit = McStringCodec.encode(this, value)
 public fun BytesBuffer.readMcString(): String = McStringCodec.decode(this)
 
+public fun BytesBuffer.readPrefixedByteArray(): ByteArray {
+    val length = this.readVarInt()
+    val data = this.readBytes(length)
+    return data
+}
+
+public fun BytesBuffer.writePrefixedByteArray(data: ByteArray) {
+    this.writeVarInt(data.size)
+    this.writeBytes(data)
+}
+
+public fun BytesBuffer.readPrefixedVarIntArray(): List<Int> {
+    val length = readVarInt()
+    val list = ArrayList<Int>(length)
+    repeat(length) { list.add(readVarInt()) }
+    return list
+}
+
+public fun BytesBuffer.writePrefixedVarIntArray(value: List<Int>) {
+    writeVarInt(value.size)
+    for (item in value) writeVarInt(item)
+}
+
+public fun BytesBuffer.readPrefixedStringArray(): List<String> {
+    val length = readVarInt()
+    val list = ArrayList<String>(length)
+    repeat(length) { list.add(readMcString()) }
+    return list
+}
+
+public fun BytesBuffer.writePrefixedStringArray(value: List<String>) {
+    writeVarInt(value.size)
+    for (item in value) writeMcString(item)
+}
+
+public inline fun <T> BytesBuffer.writePrefixedArray(value: List<T>, writeItem: BytesBuffer.(T) -> Unit) {
+    writeVarInt(value.size)
+    for (item in value) writeItem(item)
+}
+
 public fun ReadChannel.readPacketFrame(): BytesBuffer {
     val length = this.readVarInt()
     return this.readBytes(length).wrap()

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

@@ -34,6 +34,34 @@ public object VarIntCodec : PacketCodec<Int> {
     }
 }
 
+public object VarLongCodec : PacketCodec<Long> {
+    override fun encode(buffer: BytesBuffer, value: Long) {
+        var v = value
+        while (true) {
+            if ((v and 0x7FL.inv()) == 0L) {
+                buffer.writeByte(v.toByte())
+                return
+            }
+            buffer.writeByte(((v and 0x7F) or 0x80).toByte())
+            v = v ushr 7
+        }
+    }
+
+    override fun decode(buffer: BytesBuffer): Long {
+        var numRead = 0
+        var result = 0L
+        var read: Byte
+        do {
+            read = buffer.readByte()
+            val value = (read.toLong() and 0x7F)
+            result = result or (value shl (7 * numRead))
+            numRead++
+            if (numRead > 10) throw IllegalArgumentException("VarLong is too big")
+        } while ((read.toInt() and 0x80) != 0)
+        return result
+    }
+}
+
 public object McStringCodec : PacketCodec<String> {
     override fun encode(buffer: BytesBuffer, value: String) {
         val bytes = value.encodeToByteArray()