Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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48 lines
1.3 KiB
48 lines
1.3 KiB
package org.openrs2.protocol
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import io.netty.buffer.ByteBuf
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import io.netty.buffer.ByteBufAllocator
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import org.openrs2.crypto.StreamCipher
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public abstract class PacketCodec<T : Packet>(
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public val type: Class<T>,
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public val opcode: Int,
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public val length: Int
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) {
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init {
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require(opcode in 0 until 256)
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require(length >= PacketLength.VARIABLE_SHORT)
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}
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public abstract fun decode(input: ByteBuf, cipher: StreamCipher): T
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public abstract fun encode(input: T, output: ByteBuf, cipher: StreamCipher)
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public open fun getLength(input: T): Int {
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return length
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}
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public fun allocateBuffer(alloc: ByteBufAllocator, input: T, preferDirect: Boolean): ByteBuf {
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val payloadLen = getLength(input)
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if (payloadLen < 0) {
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return if (preferDirect) {
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alloc.ioBuffer()
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} else {
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alloc.heapBuffer()
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}
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}
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val headerLen = when (length) {
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PacketLength.VARIABLE_BYTE -> 2
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PacketLength.VARIABLE_SHORT -> 3
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else -> 1
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}
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val totalLen = headerLen + payloadLen
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return if (preferDirect) {
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alloc.ioBuffer(totalLen, totalLen)
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} else {
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alloc.heapBuffer(totalLen, totalLen)
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}
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}
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}
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