Open-source multiplayer game server compatible with the RuneScape client https://www.openrs2.org/
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openrs2/asm/src/main/java/dev/openrs2/asm/io/Pack200LibraryWriter.kt

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package dev.openrs2.asm.io
import dev.openrs2.asm.classpath.ClassPath
import dev.openrs2.asm.classpath.Library
import dev.openrs2.compress.gzip.Gzip
import dev.openrs2.util.io.DeterministicJarOutputStream
import java.io.OutputStream
import java.nio.file.Files
import java.util.jar.JarInputStream
import java.util.jar.Pack200
class Pack200LibraryWriter(private val output: OutputStream) : LibraryWriter {
override fun write(classPath: ClassPath, library: Library) {
val tempJar = Files.createTempFile(TEMP_PREFIX, JAR_SUFFIX)
try {
DeterministicJarOutputStream(Files.newOutputStream(tempJar)).use { tempOutput ->
JarLibraryWriter(tempOutput).write(classPath, library)
}
JarInputStream(Files.newInputStream(tempJar)).use { input ->
Gzip.createHeaderlessOutputStream(output).use { gzip ->
Pack200.newPacker().pack(input, gzip)
}
}
} finally {
Files.deleteIfExists(tempJar)
}
}
private companion object {
private const val TEMP_PREFIX = "tmp"
private const val JAR_SUFFIX = ".jar"
}
}