osu! pp and difficulty calculator. pure java implementation of https://github.com/Francesco149/oppai-ng .
this is meant to be a small (~1500 LOC including documentation) standalone single-file library that's as portable as possible, using only java built-ins without any extra dependency.
it works even on legacy deprecated runtimes such as jamvm (which is what I developed it on).
please don't come ask me for more java projects or associate me with it. I don't like the language and I was half-memeing with this project although it's fully functional.
just drop Koohii.java into your project's folder and you are ready to go.
on a linux system (or git bash for windows) it can be done in two commands like so:
cd my/project
curl https://raw.githubusercontent.com/Francesco149/koohii/master/src/main/java/com/github/francesco149/koohii/Koohii.java -Ofor full documentation, read Koohii.java or
javadoc Koohii.java
to generate HTML documentation.
If you know any plain text javadoc generator or anything that can be browsed without a GUI or third party software please let me know and I will add instructions.
if you prefer using maven, koohii is now also available on
maven central, add this to the <dependencies> section of your
pom.xml:
<dependency>
<groupId>com.github.francesco149</groupId>
<artifactId>koohii</artifactId>
<version>1.0.12</version>
</dependency>package com.example;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import com.github.francesco149.koohii.*;
class Example {
public static
void main(String[] args) throws java.io.IOException
{
BufferedReader stdin =
new BufferedReader(new InputStreamReader(System.in)
);
Koohii.Map beatmap = new Koohii.Parser().map(stdin);
Koohii.DiffCalc stars = new Koohii.DiffCalc().calc(beatmap);
System.out.printf("%s stars\n", stars.total);
Koohii.PPv2 pp = new Koohii.PPv2(
stars.aim, stars.speed, beatmap
);
System.out.printf("%s pp\n", pp.total);
}
}javac -d . Koohii.java
javac -d . Example.java
cat /path/to/file.osu | java com.example.Example
old compilers might require -1.5 to properly build this.
if you are stuck with jamvm, replace java with jamvm
when running the test suite, speed is roughly equivalent to the C implementation, but peak memory usage is almost 80 times higher. if you are on a system with limited resources or you don't want to spend time installing and setting up java, you can use the C implementation which doesn't depend on any third party software.
test were performed on a i7-4790k inside a qemu + kvm debian virtual machine (since I don't want to bootstrap jdk on my daily driver musl-based distro).
openjdk:
$ java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-2-b11)
OpenJDK Server VM (build 25.131-b11, mixed mode)
$ cd ~/src/Koohii
$ javac Test.java
$ busybox time -v java Test
...
Command being timed: "java Test"
User time (seconds): 9.16
System time (seconds): 0.57
Percent of CPU this job got: 119%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 8.18s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 799408
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 48411
Voluntary context switches: 3188
Involuntary context switches: 1277
Swaps: 0
File system inputs: 0
File system outputs: 1416
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0oracle jdk:
$ java -version
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) Server VM (build 25.144-b01, mixed mode)
$ cd ~/src/Koohii
$ javac Test.java
$ busybox time -v java Test
...
Command being timed: "java Test"
User time (seconds): 9.17
System time (seconds): 0.67
Percent of CPU this job got: 118%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 8.30s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 796384
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 48012
Voluntary context switches: 3543
Involuntary context switches: 1139
Swaps: 0
File system inputs: 0
File system outputs: 1424
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0oppai-ng (C version):
$ cd ~/src/oppai-ng/test/
$ ./build
$ time -v ./oppai_test
...
Command being timed: "./oppai_test"
User time (seconds): 9.09
System time (seconds): 0.06
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 9.15s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 11840
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 304
Voluntary context switches: 1
Involuntary context switches: 39
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0