Initial commit

2026-09-03 19:32:46 +08:00
commit b3583ba48d
@@ -0,0 +1,49 @@
 .gradle
 build/
 !gradle/wrapper/gradle-wrapper.jar
 !**/src/main/**/build/
 !**/src/test/**/build/
 ### IntelliJ IDEA ###
 .idea/modules.xml
 .idea/jarRepositories.xml
 .idea/compiler.xml
 .idea/libraries/
 *.iws
 *.iml
 *.ipr
 out/
 !**/src/main/**/out/
 !**/src/test/**/out/
 ### Kotlin ###
 .kotlin
 ### Eclipse ###
 .apt_generated
 .classpath
 .factorypath
 .project
 .settings
 .springBeans
 .sts4-cache
 bin/
 !**/src/main/**/bin/
 !**/src/test/**/bin/
 ### NetBeans ###
 /nbproject/private/
 /nbbuild/
 /dist/
 /nbdist/
 /.nb-gradle/
 ### VS Code ###
 .vscode/
 ### Mac OS ###
 .DS_Store
 .idea/
 .kotlin/
 **/build/*
@@ -0,0 +1,201 @@
                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/
   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
   1. Definitions.
      "License" shall mean the terms and conditions for use, reproduction,
      and distribution as defined by Sections 1 through 9 of this document.
      "Licensor" shall mean the copyright owner or entity authorized by
      the copyright owner that is granting the License.
      "Legal Entity" shall mean the union of the acting entity and all
      other entities that control, are controlled by, or are under common
      control with that entity. For the purposes of this definition,
      "control" means (i) the power, direct or indirect, to cause the
      direction or management of such entity, whether by contract or
      otherwise, or (ii) ownership of fifty percent (50%) or more of the
      outstanding shares, or (iii) beneficial ownership of such entity.
      "You" (or "Your") shall mean an individual or Legal Entity
      exercising permissions granted by this License.
      "Source" form shall mean the preferred form for making modifications,
      including but not limited to software source code, documentation
      source, and configuration files.
      "Object" form shall mean any form resulting from mechanical
      transformation or translation of a Source form, including but
      not limited to compiled object code, generated documentation,
      and conversions to other media types.
      "Work" shall mean the work of authorship, whether in Source or
      Object form, made available under the License, as indicated by a
      copyright notice that is included in or attached to the work
      (an example is provided in the Appendix below).
      "Derivative Works" shall mean any work, whether in Source or Object
      form, that is based on (or derived from) the Work and for which the
      editorial revisions, annotations, elaborations, or other modifications
      represent, as a whole, an original work of authorship. For the purposes
      of this License, Derivative Works shall not include works that remain
      separable from, or merely link (or bind by name) to the interfaces of,
      the Work and Derivative Works thereof.
      "Contribution" shall mean any work of authorship, including
      the original version of the Work and any modifications or additions
      to that Work or Derivative Works thereof, that is intentionally
      submitted to Licensor for inclusion in the Work by the copyright owner
      or by an individual or Legal Entity authorized to submit on behalf of
      the copyright owner. For the purposes of this definition, "submitted"
      means any form of electronic, verbal, or written communication sent
      to the Licensor or its representatives, including but not limited to
      communication on electronic mailing lists, source code control systems,
      and issue tracking systems that are managed by, or on behalf of, the
      Licensor for the purpose of discussing and improving the Work, but
      excluding communication that is conspicuously marked or otherwise
      designated in writing by the copyright owner as "Not a Contribution."
      "Contributor" shall mean Licensor and any individual or Legal Entity
      on behalf of whom a Contribution has been received by Licensor and
      subsequently incorporated within the Work.
   2. Grant of Copyright License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      copyright license to reproduce, prepare Derivative Works of,
      publicly display, publicly perform, sublicense, and distribute the
      Work and such Derivative Works in Source or Object form.
   3. Grant of Patent License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      (except as stated in this section) patent license to make, have made,
      use, offer to sell, sell, import, and otherwise transfer the Work,
      where such license applies only to those patent claims licensable
      by such Contributor that are necessarily infringed by their
      Contribution(s) alone or by combination of their Contribution(s)
      with the Work to which such Contribution(s) was submitted. If You
      institute patent litigation against any entity (including a
      cross-claim or counterclaim in a lawsuit) alleging that the Work
      or a Contribution incorporated within the Work constitutes direct
      or contributory patent infringement, then any patent licenses
      granted to You under this License for that Work shall terminate
      as of the date such litigation is filed.
   4. Redistribution. You may reproduce and distribute copies of the
      Work or Derivative Works thereof in any medium, with or without
      modifications, and in Source or Object form, provided that You
      meet the following conditions:
      (a) You must give any other recipients of the Work or
          Derivative Works a copy of this License; and
      (b) You must cause any modified files to carry prominent notices
          stating that You changed the files; and
      (c) You must retain, in the Source form of any Derivative Works
          that You distribute, all copyright, patent, trademark, and
          attribution notices from the Source form of the Work,
          excluding those notices that do not pertain to any part of
          the Derivative Works; and
      (d) If the Work includes a "NOTICE" text file as part of its
          distribution, then any Derivative Works that You distribute must
          include a readable copy of the attribution notices contained
          within such NOTICE file, excluding those notices that do not
          pertain to any part of the Derivative Works, in at least one
          of the following places: within a NOTICE text file distributed
          as part of the Derivative Works; within the Source form or
          documentation, if provided along with the Derivative Works; or,
          within a display generated by the Derivative Works, if and
          wherever such third-party notices normally appear. The contents
          of the NOTICE file are for informational purposes only and
          do not modify the License. You may add Your own attribution
          notices within Derivative Works that You distribute, alongside
          or as an addendum to the NOTICE text from the Work, provided
          that such additional attribution notices cannot be construed
          as modifying the License.
      You may add Your own copyright statement to Your modifications and
      may provide additional or different license terms and conditions
      for use, reproduction, or distribution of Your modifications, or
      for any such Derivative Works as a whole, provided Your use,
      reproduction, and distribution of the Work otherwise complies with
      the conditions stated in this License.
   5. Submission of Contributions. Unless You explicitly state otherwise,
      any Contribution intentionally submitted for inclusion in the Work
      by You to the Licensor shall be under the terms and conditions of
      this License, without any additional terms or conditions.
      Notwithstanding the above, nothing herein shall supersede or modify
      the terms of any separate license agreement you may have executed
      with Licensor regarding such Contributions.
   6. Trademarks. This License does not grant permission to use the trade
      names, trademarks, service marks, or product names of the Licensor,
      except as required for reasonable and customary use in describing the
      origin of the Work and reproducing the content of the NOTICE file.
   7. Disclaimer of Warranty. Unless required by applicable law or
      agreed to in writing, Licensor provides the Work (and each
      Contributor provides its Contributions) on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
      implied, including, without limitation, any warranties or conditions
      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
      PARTICULAR PURPOSE. You are solely responsible for determining the
      appropriateness of using or redistributing the Work and assume any
      risks associated with Your exercise of permissions under this License.
   8. Limitation of Liability. In no event and under no legal theory,
      whether in tort (including negligence), contract, or otherwise,
      unless required by applicable law (such as deliberate and grossly
      negligent acts) or agreed to in writing, shall any Contributor be
      liable to You for damages, including any direct, indirect, special,
      incidental, or consequential damages of any character arising as a
      result of this License or out of the use or inability to use the
      Work (including but not limited to damages for loss of goodwill,
      work stoppage, computer failure or malfunction, or any and all
      other commercial damages or losses), even if such Contributor
      has been advised of the possibility of such damages.
   9. Accepting Warranty or Additional Liability. While redistributing
      the Work or Derivative Works thereof, You may choose to offer,
      and charge a fee for, acceptance of support, warranty, indemnity,
      or other liability obligations and/or rights consistent with this
      License. However, in accepting such obligations, You may act only
      on Your own behalf and on Your sole responsibility, not on behalf
      of any other Contributor, and only if You agree to indemnify,
      defend, and hold each Contributor harmless for any liability
      incurred by, or claims asserted against, such Contributor by reason
      of your accepting any such warranty or additional liability.
   END OF TERMS AND CONDITIONS
   APPENDIX: How to apply the Apache License to your work.
      To apply the Apache License to your work, attach the following
      boilerplate notice, with the fields enclosed by brackets "{}"
      replaced with your own identifying information. (Don't include
      the brackets!)  The text should be enclosed in the appropriate
      comment syntax for the file format. We also recommend that a
      file or class name and description of purpose be included on the
      same "printed page" as the copyright notice for easier
      identification within third-party archives.
   Copyright 2026 RTAkland
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
       http://www.apache.org/licenses/LICENSE-2.0
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
@@ -0,0 +1,42 @@
 # mcping
 A lightweight motd ping library for kotlin multiplatform and java,
 no dependencies in `jvm` target except `kotlin-stdlib`
 native platforms required `ktor-network` and `kotlinx-io`
 # Supported targets
 - jvm 1.8
 - mingwX64
 - linuxArm64
 - liunxX64
 - iosArm64
 - iosSimulatorArm64
 - macosArm64
 # Get started
 ```kotlin
 repositories {
    maven("https://repo.rtast.cn/packages")
 }
 dependencies {
    implementation("cn.rtast.mcping:mcping:0.0.1")
 }
 ```
 ```kotlin
 fun main() {
    // return a json respose
    val response: String = mcping("org.mc-complex.com", 25565)
    println(response)
 }
 ```
 > An example json response can be found at [ping-response-example](example/java-ping-response.json) (Formatted)
 # Open Source
 Open source under [Apache-2.0](LICENSE)
@@ -0,0 +1,57 @@
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 plugins {
    kotlin("multiplatform") version "2.4.10"
    id("maven-publish")
 }
 group = "cn.rtast.mcping"
 version = "0.0.1"
 repositories {
    mavenCentral()
 }
 kotlin {
    explicitApi()
    linuxX64()
    linuxArm64()
    macosArm64()
    mingwX64()
    iosArm64()
    iosSimulatorArm64()
    jvm { compilerOptions.jvmTarget = JvmTarget.JVM_1_8 }
    sourceSets {
        jvmMain.dependencies {
            // no dependencies needed
        }
        nativeMain.dependencies {
            implementation("io.ktor:ktor-network:3.5.2")
            implementation("org.jetbrains.kotlinx:kotlinx-io-core:0.9.1")
        }
        commonTest.dependencies {
            implementation(kotlin("test"))
            implementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.11.0")
        }
    }
    compilerOptions.freeCompilerArgs.addAll("-Xexpect-actual-classes")
 }
 publishing {
    repositories {
        maven("https://repo.rtast.cn/packages") {
            credentials(HttpHeaderCredentials::class) {
                name = "Authorization"
                value = "Bearer ${System.getenv("PUBLISH_TOKEN")}"
            }
            authentication {
                create<HttpHeaderAuthentication>("header")
            }
        }
    }
 }
@@ -0,0 +1,5 @@
 kotlin.code.style=official
 kotlin.native.ignoreDisabledTargets=true
 kotlin.native.enableKlibsCrossCompilation=true
 kotlin.daemon.jvmargs=-Xmx2048M
 org.gradle.jvmargs=-Xmx3g -Dfile.encoding=UTF-8
@@ -0,0 +1,6 @@
 #Thu Sep 03 17:39:51 CST 2026
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.5-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
@@ -0,0 +1,234 @@
 #!/bin/sh
 #
 # Copyright © 2015-2021 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      https://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
 ##############################################################################
 #
 #   Gradle start up script for POSIX generated by Gradle.
 #
 #   Important for running:
 #
 #   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
 #       noncompliant, but you have some other compliant shell such as ksh or
 #       bash, then to run this script, type that shell name before the whole
 #       command line, like:
 #
 #           ksh Gradle
 #
 #       Busybox and similar reduced shells will NOT work, because this script
 #       requires all of these POSIX shell features:
 #         * functions;
 #         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
 #           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
 #         * compound commands having a testable exit status, especially «case»;
 #         * various built-in commands including «command», «set», and «ulimit».
 #
 #   Important for patching:
 #
 #   (2) This script targets any POSIX shell, so it avoids extensions provided
 #       by Bash, Ksh, etc; in particular arrays are avoided.
 #
 #       The "traditional" practice of packing multiple parameters into a
 #       space-separated string is a well documented source of bugs and security
 #       problems, so this is (mostly) avoided, by progressively accumulating
 #       options in "$@", and eventually passing that to Java.
 #
 #       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
 #       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
 #       see the in-line comments for details.
 #
 #       There are tweaks for specific operating systems such as AIX, CygWin,
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
 #       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
 #
 ##############################################################################
 # Attempt to set APP_HOME
 # Resolve links: $0 may be a link
 app_path=$0
 # Need this for daisy-chained symlinks.
 while
    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
    [ -h "$app_path" ]
 do
    ls=$( ls -ld "$app_path" )
    link=${ls#*' -> '}
    case $link in             #(
      /*)   app_path=$link ;; #(
      *)    app_path=$APP_HOME$link ;;
    esac
 done
 APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 APP_NAME="Gradle"
 APP_BASE_NAME=${0##*/}
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
 warn () {
    echo "$*"
 } >&2
 die () {
    echo
    echo "$*"
    echo
    exit 1
 } >&2
 # OS specific support (must be 'true' or 'false').
 cygwin=false
 msys=false
 darwin=false
 nonstop=false
 case "$( uname )" in                #(
  CYGWIN* )         cygwin=true  ;; #(
  Darwin* )         darwin=true  ;; #(
  MSYS* | MINGW* )  msys=true    ;; #(
  NONSTOP* )        nonstop=true ;;
 esac
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 # Determine the Java command to use to start the JVM.
 if [ -n "$JAVA_HOME" ] ; then
    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
        # IBM's JDK on AIX uses strange locations for the executables
        JAVACMD=$JAVA_HOME/jre/sh/java
    else
        JAVACMD=$JAVA_HOME/bin/java
    fi
    if [ ! -x "$JAVACMD" ] ; then
        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
    fi
 else
    JAVACMD=java
    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
 fi
 # Increase the maximum file descriptors if we can.
 if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
    case $MAX_FD in #(
      max*)
        MAX_FD=$( ulimit -H -n ) ||
            warn "Could not query maximum file descriptor limit"
    esac
    case $MAX_FD in  #(
      '' | soft) :;; #(
      *)
        ulimit -n "$MAX_FD" ||
            warn "Could not set maximum file descriptor limit to $MAX_FD"
    esac
 fi
 # Collect all arguments for the java command, stacking in reverse order:
 #   * args from the command line
 #   * the main class name
 #   * -classpath
 #   * -D...appname settings
 #   * --module-path (only if needed)
 #   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
 # For Cygwin or MSYS, switch paths to Windows format before running java
 if "$cygwin" || "$msys" ; then
    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
    JAVACMD=$( cygpath --unix "$JAVACMD" )
    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    for arg do
        if
            case $arg in                                #(
              -*)   false ;;                            # don't mess with options #(
              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
                    [ -e "$t" ] ;;                      #(
              *)    false ;;
            esac
        then
            arg=$( cygpath --path --ignore --mixed "$arg" )
        fi
        # Roll the args list around exactly as many times as the number of
        # args, so each arg winds up back in the position where it started, but
        # possibly modified.
        #
        # NB: a `for` loop captures its iteration list before it begins, so
        # changing the positional parameters here affects neither the number of
        # iterations, nor the values presented in `arg`.
        shift                   # remove old arg
        set -- "$@" "$arg"      # push replacement arg
    done
 fi
 # Collect all arguments for the java command;
 #   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
 #     shell script including quotes and variable substitutions, so put them in
 #     double quotes to make sure that they get re-expanded; and
 #   * put everything else in single quotes, so that it's not re-expanded.
 set -- \
        "-Dorg.gradle.appname=$APP_BASE_NAME" \
        -classpath "$CLASSPATH" \
        org.gradle.wrapper.GradleWrapperMain \
        "$@"
 # Use "xargs" to parse quoted args.
 #
 # With -n1 it outputs one arg per line, with the quotes and backslashes removed.
 #
 # In Bash we could simply go:
 #
 #   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
 #   set -- "${ARGS[@]}" "$@"
 #
 # but POSIX shell has neither arrays nor command substitution, so instead we
 # post-process each arg (as a line of input to sed) to backslash-escape any
 # character that might be a shell metacharacter, then use eval to reverse
 # that process (while maintaining the separation between arguments), and wrap
 # the whole thing up as a single "set" statement.
 #
 # This will of course break if any of these variables contains a newline or
 # an unmatched quote.
 #
 eval "set -- $(
        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
        xargs -n1 |
        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
        tr '\n' ' '
    )" '"$@"'
 exec "$JAVACMD" "$@"
@@ -0,0 +1,89 @@
@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem      https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@if "%DEBUG%" == "" @echo off
@rem ##########################################################################
@rem
@rem  Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
 if "%OS%"=="Windows_NT" setlocal
 set DIRNAME=%~dp0
 if "%DIRNAME%" == "" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
 for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if "%ERRORLEVEL%" == "0" goto execute
 echo.
 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 echo.
 echo Please set the JAVA_HOME variable in your environment to match the
 echo location of your Java installation.
 goto fail
 :findJavaFromJavaHome
 set JAVA_HOME=%JAVA_HOME:"=%
 set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 if exist "%JAVA_EXE%" goto execute
 echo.
 echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
 echo.
 echo Please set the JAVA_HOME variable in your environment to match the
 echo location of your Java installation.
 goto fail
 :execute
@rem Setup the command line
 set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
 "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
 :end
@rem End local scope for the variables with windows NT shell
 if "%ERRORLEVEL%"=="0" goto mainEnd
 :fail
 rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
 rem the _cmd.exe /c_ return code!
 if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
 exit /b 1
 :mainEnd
 if "%OS%"=="Windows_NT" endlocal
 :omega
@@ -0,0 +1,4 @@
 plugins {
    id("org.gradle.toolchains.foojay-resolver-convention") version "0.8.0"
 }
 rootProject.name = "mcping"
@@ -0,0 +1,48 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping
 import cn.rtast.mcping.platform.PlatformBuffer
 import cn.rtast.mcping.platform.PlatformReadChannel
 internal fun PlatformBuffer.writeVarInt(value: Int) {
    var v = value
    while (true) {
        if ((v and 0x7F.inv()) == 0) {
            this.writeByte(v.toByte())
            return
        }
        this.writeByte(((v and 0x7F) or 0x80).toByte())
        v = v ushr 7
    }
 }
 internal fun PlatformReadChannel.readVarInt(): Int {
    var value = 0
    var position = 0
    while (true) {
        val currentByte = this.readByte().toInt() and 0xFF
        value = value or ((currentByte and 0x7F) shl position)
        if ((currentByte and 0x80) == 0) break
        position += 7
        if (position >= 35) throw IllegalArgumentException("VarInt too long")
    }
    return value
 }
 internal fun PlatformBuffer.writeMcString(value: String) {
    val bytes = value.encodeToByteArray()
    this.writeVarInt(bytes.size)
    this.writeBytes(bytes)
 }
 internal fun PlatformReadChannel.readMcString(): String {
    val length = this.readVarInt()
    val bytes = this.readBytes(length)
    return bytes.decodeToString()
 }
@@ -0,0 +1,35 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping
 import cn.rtast.mcping.platform.PlatformSocket
 public fun mcping(host: String, port: Int): String {
    val socket = PlatformSocket(host, port)
    val receiveChannel = socket.openReadChannel()
    val sendChannel = socket.openWriteChannel()
    return try {
        val handshakePacket = HandshakePacket(
            protocolVersion = -1,
            serverAddress = host,
            serverPort = port.toUShort(),
            nextState = 1
        )
        sendChannel.sendPacket(handshakePacket)
        sendChannel.sendPacket(StatusRequestPacket)
        receiveChannel.readVarInt()  // consume a varint
        val packetId = receiveChannel.readVarInt()
        if (packetId == StatusRequestPacket.packetId) receiveChannel.readMcString()
        else throw IllegalStateException("Server does not respond correct packet id, expected ${StatusRequestPacket.packetId} but got $packetId")
    } finally {
        socket.close()
    }
 }
@@ -0,0 +1,43 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping
 import cn.rtast.mcping.platform.PlatformBuffer
 internal interface MinecraftPacket {
    val packetId: Int
    fun writePayload(buffer: PlatformBuffer)
 }
 // ref https://minecraft.wiki/w/Java_Edition_protocol/Packets#Handshake
 internal data class HandshakePacket(
    val protocolVersion: Int,
    val serverAddress: String,
    val serverPort: UShort,
    // 1 -> Status
    val nextState: Int,
 ) : MinecraftPacket {
    override val packetId: Int = 0x00
    override fun writePayload(buffer: PlatformBuffer) {
        buffer.writeVarInt(protocolVersion)
        buffer.writeMcString(serverAddress)
        // write UShort
        // write 2 bytes big endian
        buffer.writeByte((serverPort.toInt() shr 8).toByte())
        buffer.writeByte(serverPort.toByte())
        buffer.writeVarInt(nextState)
    }
 }
 // ref https://minecraft.wiki/w/Java_Edition_protocol/Packets#Status
 internal data object StatusRequestPacket : MinecraftPacket {
    override val packetId: Int = 0x00
    override fun writePayload(buffer: PlatformBuffer) {}
 }
@@ -0,0 +1,23 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping
 import cn.rtast.mcping.platform.PlatformBuffer
 import cn.rtast.mcping.platform.PlatformWriteChannel
 internal fun PlatformWriteChannel.sendPacket(packet: MinecraftPacket) {
    val bodyBuffer = PlatformBuffer()
    bodyBuffer.writeVarInt(packet.packetId)
    packet.writePayload(bodyBuffer)
    val frameBuffer = PlatformBuffer()
    frameBuffer.writeVarInt(bodyBuffer.size)
    frameBuffer.writeBytes(bodyBuffer.toByteArray())
    val bytes = frameBuffer.toByteArray()
    this.writeFully(bytes, 0, bytes.size)
    this.flush()
 }
@@ -0,0 +1,17 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping.platform
 internal expect class PlatformBuffer() {
    fun writeByte(value: Byte)
    fun writeBytes(bytes: ByteArray)
    fun readByte(): Byte
    fun readBytes(length: Int): ByteArray
    fun toByteArray(): ByteArray
    val size: Int
 }
@@ -0,0 +1,19 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping.platform
 internal expect class PlatformReadChannel {
    fun readByte(): Byte
    fun readBytes(length: Int): ByteArray
    fun readFully(out: ByteArray, start: Int = 0, end: Int = out.size)
 }
 internal expect class PlatformWriteChannel {
    fun writeFully(value: ByteArray, startIndex: Int = 0, endIndex: Int = value.size)
    fun flush()
 }
@@ -0,0 +1,14 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping.platform
 internal expect class PlatformSocket internal constructor(host: String, port: Int){
    fun openReadChannel(): PlatformReadChannel
    fun openWriteChannel(): PlatformWriteChannel
    fun close()
 }
@@ -0,0 +1,21 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package test
 import cn.rtast.mcping.mcping
 import kotlinx.coroutines.test.runTest
 import kotlin.test.Test
 class TestPing {
    @Test
    fun `test ping java server`() = runTest {
        val response = mcping("org.mc-complex.com", 25565)
        println(response)
    }
 }
@@ -0,0 +1,35 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping.platform
 import java.io.ByteArrayOutputStream
 internal actual class PlatformBuffer actual constructor() {
    private val stream = ByteArrayOutputStream()
    private var readOffset = 0
    actual fun writeByte(value: Byte) = stream.write(value.toInt())
    actual fun writeBytes(bytes: ByteArray) = stream.write(bytes)
    actual fun readByte(): Byte {
        val array = stream.toByteArray()
        if (readOffset >= array.size) throw IndexOutOfBoundsException("Buffer underflow")
        return array[readOffset++]
    }
    actual fun readBytes(length: Int): ByteArray {
        val array = stream.toByteArray()
        if (readOffset + length > array.size) throw IndexOutOfBoundsException("Buffer underflow")
        val result = array.copyOfRange(readOffset, readOffset + length)
        readOffset += length
        return result
    }
    actual fun toByteArray(): ByteArray = stream.toByteArray()
    actual val size: Int
        get() = stream.size()
 }
@@ -0,0 +1,44 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping.platform
 import java.io.InputStream
 import java.io.OutputStream
 internal actual class PlatformReadChannel {
    private val _inputStream: InputStream
    constructor(inputStream: InputStream) {
        _inputStream = inputStream
    }
    actual fun readByte(): Byte = _inputStream.read().toByte()
    actual fun readBytes(length: Int): ByteArray = _inputStream.readNBytes(length)
    actual fun readFully(out: ByteArray, start: Int, end: Int) {
        var bytesRead = 0
        val length = end - start
        while (bytesRead < length) {
            val read = _inputStream.read(out, start + bytesRead, length - bytesRead)
            if (read == -1) throw IllegalStateException("End of stream")
            bytesRead += read
        }
    }
 }
 internal actual class PlatformWriteChannel {
    private val _outputStream: OutputStream
    constructor(outputStream: OutputStream) {
        _outputStream = outputStream
    }
    actual fun writeFully(value: ByteArray, startIndex: Int, endIndex: Int) =
        _outputStream.write(value, startIndex, endIndex - startIndex)
    actual fun flush() = _outputStream.flush()
 }
@@ -0,0 +1,17 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping.platform
 import java.net.Socket
 internal actual class PlatformSocket internal actual constructor(host: String, port: Int) {
    private val socket = Socket(host, port)
    actual fun openReadChannel(): PlatformReadChannel = PlatformReadChannel(socket.getInputStream())
    actual fun openWriteChannel(): PlatformWriteChannel = PlatformWriteChannel(socket.getOutputStream())
    actual fun close() = socket.close()
 }
@@ -0,0 +1,24 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping.platform
 import kotlinx.io.Buffer
 import kotlinx.io.readByteArray
 internal actual class PlatformBuffer actual constructor() {
    private val _delegateBuf = Buffer()
    actual fun writeByte(value: Byte) = _delegateBuf.writeByte(value)
    actual fun writeBytes(bytes: ByteArray) = _delegateBuf.write(bytes)
    actual fun readByte(): Byte = _delegateBuf.readByte()
    actual fun readBytes(length: Int): ByteArray = _delegateBuf.readByteArray(length)
    actual fun toByteArray(): ByteArray = _delegateBuf.peek().readByteArray()
    actual val size: Int
        get() = _delegateBuf.size.toInt()
 }
@@ -0,0 +1,35 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping.platform
 import io.ktor.utils.io.*
 import kotlinx.coroutines.runBlocking
 internal actual class PlatformReadChannel {
    private val _readChannel: ByteReadChannel
    constructor(readChannel: ByteReadChannel) {
        _readChannel = readChannel
    }
    actual fun readByte(): Byte = runBlocking { _readChannel.readByte() }
    actual fun readBytes(length: Int): ByteArray = runBlocking { _readChannel.readByteArray(length) }
    actual fun readFully(out: ByteArray, start: Int, end: Int) = runBlocking { _readChannel.readFully(out, start, end) }
 }
 internal actual class PlatformWriteChannel {
    private val _writeChannel: ByteWriteChannel
    constructor(writeChannel: ByteWriteChannel) {
        _writeChannel = writeChannel
    }
    actual fun writeFully(value: ByteArray, startIndex: Int, endIndex: Int) =
        runBlocking { _writeChannel.writeFully(value, startIndex, endIndex) }
    actual fun flush() = runBlocking { _writeChannel.flush() }
 }
@@ -0,0 +1,28 @@
 /*
 * Copyright © 2026 RTAkland
 * Author: RTAkland
 * Date: 2026/9/3
 */
 package cn.rtast.mcping.platform
 import io.ktor.network.selector.*
 import io.ktor.network.sockets.*
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.IO
 import kotlinx.coroutines.runBlocking
 internal actual class PlatformSocket internal actual constructor(host: String, port: Int) {
    private val sm = SelectorManager(Dispatchers.IO)
    private val socket = runBlocking { aSocket(sm).tcp().connect(host, port) }
    actual fun openReadChannel(): PlatformReadChannel = PlatformReadChannel(socket.openReadChannel())
    actual fun openWriteChannel(): PlatformWriteChannel =
        PlatformWriteChannel(socket.openWriteChannel(autoFlush = true))
    actual fun close() {
        socket.close()
        sm.close()
    }
 }