This commit is contained in:
femsci 2024-03-28 20:32:46 +01:00
parent 3ffc40596a
commit 252c144431
Signed by: femsci
GPG key ID: 21AC2CC03E5BBCD6
5 changed files with 376 additions and 1 deletions

View file

@ -1,5 +1,7 @@
# PPJ
This branch contains the solution for the **nth task**.
This branch contains the solution for the **1st task**.
This solution contains Rust code :333c
[Go back to main](/femsci/ppj/src/branch/nya)

243
j1-rs/Cargo.lock generated Normal file
View file

@ -0,0 +1,243 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "bytes"
version = "1.5.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
[[package]]
name = "cesu8"
version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6d43a04d8753f35258c91f8ec639f792891f748a1edbd759cf1dcea3382ad83c"
[[package]]
name = "cfg-if"
version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
[[package]]
name = "combine"
version = "4.6.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "35ed6e9d84f0b51a7f52daf1c7d71dd136fd7a3f41a8462b8cdb8c78d920fad4"
dependencies = [
"bytes",
"memchr",
]
[[package]]
name = "j1-rs"
version = "0.1.0"
dependencies = [
"jni",
]
[[package]]
name = "jni"
version = "0.21.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1a87aa2bb7d2af34197c04845522473242e1aa17c12f4935d5856491a7fb8c97"
dependencies = [
"cesu8",
"cfg-if",
"combine",
"jni-sys",
"log",
"thiserror",
"walkdir",
"windows-sys",
]
[[package]]
name = "jni-sys"
version = "0.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8eaf4bc02d17cbdd7ff4c7438cafcdf7fb9a4613313ad11b4f8fefe7d3fa0130"
[[package]]
name = "log"
version = "0.4.21"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "90ed8c1e510134f979dbc4f070f87d4313098b704861a105fe34231c70a3901c"
[[package]]
name = "memchr"
version = "2.7.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"
[[package]]
name = "proc-macro2"
version = "1.0.78"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
dependencies = [
"unicode-ident",
]
[[package]]
name = "quote"
version = "1.0.35"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
dependencies = [
"proc-macro2",
]
[[package]]
name = "same-file"
version = "1.0.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
dependencies = [
"winapi-util",
]
[[package]]
name = "syn"
version = "2.0.52"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b699d15b36d1f02c3e7c69f8ffef53de37aefae075d8488d4ba1a7788d574a07"
dependencies = [
"proc-macro2",
"quote",
"unicode-ident",
]
[[package]]
name = "thiserror"
version = "1.0.57"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1e45bcbe8ed29775f228095caf2cd67af7a4ccf756ebff23a306bf3e8b47b24b"
dependencies = [
"thiserror-impl",
]
[[package]]
name = "thiserror-impl"
version = "1.0.57"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a953cb265bef375dae3de6663da4d3804eee9682ea80d8e2542529b73c531c81"
dependencies = [
"proc-macro2",
"quote",
"syn",
]
[[package]]
name = "unicode-ident"
version = "1.0.12"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
[[package]]
name = "walkdir"
version = "2.5.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "29790946404f91d9c5d06f9874efddea1dc06c5efe94541a7d6863108e3a5e4b"
dependencies = [
"same-file",
"winapi-util",
]
[[package]]
name = "winapi"
version = "0.3.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
dependencies = [
"winapi-i686-pc-windows-gnu",
"winapi-x86_64-pc-windows-gnu",
]
[[package]]
name = "winapi-i686-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
[[package]]
name = "winapi-util"
version = "0.1.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f29e6f9198ba0d26b4c9f07dbe6f9ed633e1f3d5b8b414090084349e46a52596"
dependencies = [
"winapi",
]
[[package]]
name = "winapi-x86_64-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
[[package]]
name = "windows-sys"
version = "0.45.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
dependencies = [
"windows-targets",
]
[[package]]
name = "windows-targets"
version = "0.42.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
dependencies = [
"windows_aarch64_gnullvm",
"windows_aarch64_msvc",
"windows_i686_gnu",
"windows_i686_msvc",
"windows_x86_64_gnu",
"windows_x86_64_gnullvm",
"windows_x86_64_msvc",
]
[[package]]
name = "windows_aarch64_gnullvm"
version = "0.42.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
[[package]]
name = "windows_aarch64_msvc"
version = "0.42.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
[[package]]
name = "windows_i686_gnu"
version = "0.42.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
[[package]]
name = "windows_i686_msvc"
version = "0.42.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
[[package]]
name = "windows_x86_64_gnu"
version = "0.42.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
[[package]]
name = "windows_x86_64_gnullvm"
version = "0.42.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
[[package]]
name = "windows_x86_64_msvc"
version = "0.42.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"

10
j1-rs/Cargo.toml Normal file
View file

@ -0,0 +1,10 @@
[package]
name = "j1-rs"
version = "0.1.0"
edition = "2021"
[lib]
crate_type = ["cdylib"]
[dependencies]
jni = "0.21.1"

32
j1-rs/src/lib.rs Normal file
View file

@ -0,0 +1,32 @@
use jni::{objects::JClass, sys::jstring, JNIEnv};
#[no_mangle]
pub extern "system" fn Java_dev_femsci_pjatk1_Main_histogen(
env: JNIEnv,
_class: JClass,
data: i32,
) -> jstring {
let shift = |s: u8| ((data & (0xff << s)) >> s) as u8;
let (i0, i1, i2): (u8, u8, u8) = (shift(16), shift(8), shift(0));
let max = i0.max(i1.max(i2));
let mut buf = String::new();
for i in 0..max {
let f_ast = |num: u8| {
let idx = max - i;
match idx <= num {
true => '*',
false => ' ',
}
};
buf.push_str(&format!("{}{}{}\n", f_ast(i0), f_ast(i1), f_ast(i2)));
}
let str_f = env
.new_string(buf.trim_end())
.expect("Cannot create string.");
str_f.into_raw()
}

View file

@ -0,0 +1,88 @@
package dev.femsci.pjatk1;
import java.util.function.BiFunction;
/*
by femsci
*/
public class Main {
public Main() {
}
//jni ref
public static native String histogen(int data);
/*
Task 1
the premise: under some constraints, print a histogram
solution:
- parse the input
- get the greatest input value, use it as histogram bar height
- iterate over the height, inverse printing bars (bottom up) when value >= index
// // // Rust > C# >>>>> java
*/
//some brief validation messages conveying low-quality reports
public static void main(String[] args) {
if(args.length != 3) {
System.err.println("No valid arguments provided.");
System.exit(1);
return;
}
byte i0, i1, i2;
try {
i1 = Byte.parseByte(args[1]);
i0 = Byte.parseByte(args[0]);
i2 = Byte.parseByte(args[2]);
} catch(NumberFormatException _e) {
System.err.println("Provided arguments are invalid.");
System.exit(1);
return;
}
System.out.println("executing the task...");
try {
System.loadLibrary("j1_rs");
long t1 = System.nanoTime();
via_jni(i0, i1, i2);
long t2 = System.nanoTime();
System.out.printf("operation took %dµs %n", Math.ceilDiv(t2 - t1, 1000));
} catch (UnsatisfiedLinkError _e) {
System.err.println("cannot locate the library to perform jni variant");
}
long t1 = System.nanoTime();
via_plain_java(i0, i1, i2);
long t2 = System.nanoTime();
System.out.printf("operation took %dµs %n", Math.ceilDiv(t2 - t1, 1000));
}
private static void via_jni(byte i0, byte i1, byte i2) {
System.out.println("\nvia JNI to a Rust lib:");
int data = (i0 << 16) | (i1 << 8) | i2;
//can also directly write to stdout in the rust lib
System.out.println(histogen(data));
}
private static void via_plain_java(byte i0, byte i1, byte i2) {
System.out.println("\nvia the plain old Java:");
int max = Math.max(i0, Math.max(i1, i2));
//cant use primitives in lambdas
BiFunction<Integer, Byte, Character> ast = (idx, b) -> b > idx ? '*' : ' ';
//i hate java for lack of delegates and proper closures
for(int i = max - 1; i >= 0; --i) {
System.out.printf("%s%s%s%n", ast.apply(i, i0), ast.apply(i, i1), ast.apply(i, i2));
}
}
}