48 lines
1.2 KiB
Kotlin
48 lines
1.2 KiB
Kotlin
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/*
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* Copyright © 2026 RTAkland
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* Author: RTAkland
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* Date: 2026/9/3
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*/
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package cn.rtast.mcping
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import cn.rtast.mcping.platform.PlatformBuffer
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import cn.rtast.mcping.platform.PlatformReadChannel
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internal fun PlatformBuffer.writeVarInt(value: Int) {
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var v = value
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while (true) {
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if ((v and 0x7F.inv()) == 0) {
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this.writeByte(v.toByte())
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return
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}
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this.writeByte(((v and 0x7F) or 0x80).toByte())
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v = v ushr 7
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}
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}
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internal fun PlatformReadChannel.readVarInt(): Int {
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var value = 0
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var position = 0
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while (true) {
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val currentByte = this.readByte().toInt() and 0xFF
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value = value or ((currentByte and 0x7F) shl position)
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if ((currentByte and 0x80) == 0) break
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position += 7
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if (position >= 35) throw IllegalArgumentException("VarInt too long")
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}
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return value
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}
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internal fun PlatformBuffer.writeMcString(value: String) {
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val bytes = value.encodeToByteArray()
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this.writeVarInt(bytes.size)
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this.writeBytes(bytes)
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}
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internal fun PlatformReadChannel.readMcString(): String {
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val length = this.readVarInt()
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val bytes = this.readBytes(length)
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return bytes.decodeToString()
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}
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