Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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45 lines
1.5 KiB
45 lines
1.5 KiB
package org.openrs2.protocol.js5
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import io.netty.buffer.ByteBuf
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import io.netty.channel.ChannelHandler
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import io.netty.channel.ChannelHandlerContext
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import io.netty.handler.codec.EncoderException
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import io.netty.handler.codec.MessageToByteEncoder
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import kotlin.math.min
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@ChannelHandler.Sharable
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public object Js5ResponseEncoder : MessageToByteEncoder<Js5Response>(Js5Response::class.java) {
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override fun encode(ctx: ChannelHandlerContext, msg: Js5Response, out: ByteBuf) {
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out.writeByte(msg.archive)
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out.writeShort(msg.group)
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if (!msg.data.isReadable) {
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// TOOD(gpe): check if the entire container is well-formed?
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throw EncoderException("Missing compression byte")
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}
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var compression = msg.data.readUnsignedByte().toInt()
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if (msg.prefetch) {
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compression = compression or 0x80
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}
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out.writeByte(compression)
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out.writeBytes(msg.data, min(msg.data.readableBytes(), 508))
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while (msg.data.isReadable) {
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out.writeByte(0xFF)
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out.writeBytes(msg.data, min(msg.data.readableBytes(), 511))
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}
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}
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override fun allocateBuffer(ctx: ChannelHandlerContext, msg: Js5Response, preferDirect: Boolean): ByteBuf {
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val dataLen = msg.data.readableBytes()
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val len = 3 + dataLen + (2 + dataLen) / 511
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return if (preferDirect) {
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ctx.alloc().ioBuffer(len, len)
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} else {
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ctx.alloc().heapBuffer(len, len)
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}
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}
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}
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