From 6d85ac486546bde6f68f48d0c90d5eb854883573 Mon Sep 17 00:00:00 2001
From: lukellmann <lukellmann@gmail.com>
Date: Wed, 30 Aug 2023 18:52:38 +0200
Subject: [PATCH] Use jextract to generate bindings

---
 .github/workflows/ci.yml                      |  10 +
 .idea/gradle.xml                              |   1 +
 app/desktop/build.gradle.kts                  |  11 +-
 .../tonbrett/app/desktop/NativeUtil.java      |  74 ----
 app/desktop/src/main/kotlin/ConfigFile.kt     |  12 +-
 app/desktop/src/main/kotlin/NativeUtil.kt     |  37 ++
 app/desktop/src/main/kotlin/URIUtil.kt        |   2 +-
 app/desktop/uwp_helper/Cargo.lock             | 357 ++++++++++++++++--
 app/desktop/uwp_helper/Cargo.toml             |   9 +-
 app/desktop/uwp_helper/build.gradle.kts       |  47 +++
 app/desktop/uwp_helper/build.rs               |  35 ++
 app/desktop/uwp_helper/src/lib.rs             |  50 +--
 build.gradle.kts                              |   8 +-
 settings.gradle.kts                           |   2 +-
 14 files changed, 504 insertions(+), 151 deletions(-)
 delete mode 100644 app/desktop/src/main/java/dev/schlaubi/tonbrett/app/desktop/NativeUtil.java
 create mode 100644 app/desktop/src/main/kotlin/NativeUtil.kt
 create mode 100644 app/desktop/uwp_helper/build.gradle.kts
 create mode 100644 app/desktop/uwp_helper/build.rs

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1ab71ac..0305375 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -49,6 +49,16 @@ jobs:
         if: matrix.os == 'windows-latest'
         with:
           toolchain: 'stable'
+      - name: Setup jextract
+        if: matrix.os == 'windows-latest'
+        shell: powershell
+        run: |
+          Invoke-WebRequest https://download.java.net/java/early_access/jextract/1/openjdk-20-jextract+1-2_windows-x64_bin.tar.gz -OutFile jextract.tar.gz
+
+          tar xzvf jextract.tar.gz
+
+          $path = (Resolve-Path jextract-20\bin).Path
+          echo $path | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
       - name: Setup MacOS signing
         if: matrix.os == 'macos-latest'
         env:
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 5a9c276..73f8aed 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -14,6 +14,7 @@
             <option value="$PROJECT_DIR$/app" />
             <option value="$PROJECT_DIR$/app/android" />
             <option value="$PROJECT_DIR$/app/desktop" />
+            <option value="$PROJECT_DIR$/app/desktop/uwp_helper" />
             <option value="$PROJECT_DIR$/app/ios" />
             <option value="$PROJECT_DIR$/app/shared" />
             <option value="$PROJECT_DIR$/app/web" />
diff --git a/app/desktop/build.gradle.kts b/app/desktop/build.gradle.kts
index fcc1674..99b38f6 100644
--- a/app/desktop/build.gradle.kts
+++ b/app/desktop/build.gradle.kts
@@ -9,6 +9,7 @@ plugins {
 
 dependencies {
     implementation(projects.app.shared)
+    implementation(projects.app.desktop.uwpHelper)
     implementation(compose.desktop.currentOs)
     implementation(libs.logback)
     implementation(libs.ktor.server.netty)
@@ -79,16 +80,8 @@ tasks {
         archiveExtension = "tar.gz"
     }
 
-    val buildUwpHelper by registering(Exec::class) {
-        inputs.dir("uwp_helper/src")
-        outputs.dir("uwp_helper/target")
-
-        workingDir = file("uwp_helper")
-        commandLine("cargo", "build", "--release")
-    }
-
     val prepareUwpWorkspace by registering(Copy::class) {
-        dependsOn(buildUwpHelper)
+        dependsOn("uwp_helper:compileRust")
         from(named("packageReleaseAppImage")) {
             eachFile {
                 path = path.substringAfter("Tonbrett")
diff --git a/app/desktop/src/main/java/dev/schlaubi/tonbrett/app/desktop/NativeUtil.java b/app/desktop/src/main/java/dev/schlaubi/tonbrett/app/desktop/NativeUtil.java
deleted file mode 100644
index c5df211..0000000
--- a/app/desktop/src/main/java/dev/schlaubi/tonbrett/app/desktop/NativeUtil.java
+++ /dev/null
@@ -1,74 +0,0 @@
-package dev.schlaubi.tonbrett.app.desktop;
-
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.lang.foreign.*;
-import java.lang.invoke.MethodHandle;
-import java.net.URI;
-import java.util.Objects;
-
-/**
- * Utility class for calling {@code uwp_helper} functions.
- * <p>
- * Implemented in Java because {@code @PolymorphicSignature} doesn't seem to work in Kotlin
- */
-public class NativeUtil {
-
-    private static final NativeUtil instance = new NativeUtil();
-    private final Linker linker = Linker.nativeLinker();
-    private final SymbolLookup uwpHelper = SymbolLookup.libraryLookup("uwp_helper", SegmentScope.auto());
-
-    private final MethodHandle launchUriMethod = linker.downcallHandle(
-            uwpHelper.find("launch_uri").orElseThrow(),
-            FunctionDescriptor.ofVoid(ValueLayout.ADDRESS)
-    );
-
-    private final MethodHandle getAppdataFolder = linker.downcallHandle(
-            uwpHelper.find("get_appdata_folder").orElseThrow(),
-            FunctionDescriptor.ofVoid(ValueLayout.ADDRESS)
-    );
-
-    private final MethodHandle getAppdataFolderPathLength = linker.downcallHandle(
-            uwpHelper.find("get_appdata_folder_path_length").orElseThrow(),
-            FunctionDescriptor.of(ValueLayout.JAVA_LONG)
-    );
-
-    /**
-     * Tries to launch the URI using the UWP {@code Launcher}.
-     *
-     * @param uri the {@link URI} to launch
-     * @throws Throwable if an error occurs
-     */
-    public static void launchUri(@NotNull URI uri) throws Throwable {
-        Objects.requireNonNull(uri, "uri must not be null");
-        try (var arena = Arena.openConfined()) {
-            var url = arena.allocateUtf8String(uri.toString());
-
-            instance.launchUriMethod.invoke(url);
-        }
-    }
-
-    private static long getAppdataFolderLength() throws Throwable {
-        return (long) instance.getAppdataFolderPathLength.invoke();
-    }
-
-    /**
-     * Tries to retrieve the current UWP app data folder.
-     *
-     * @return the absolute path to the folder
-     * @throws Throwable if an error occurs
-     */
-    @Nullable
-    public static String getAppdataFolder() throws Throwable {
-        var length = getAppdataFolderLength();
-        if (length == 0) {
-            return null;
-        }
-        try(var arena = Arena.openConfined()) {
-            var buffer = arena.allocateArray(ValueLayout.JAVA_CHAR, length);
-            instance.getAppdataFolder.invoke(buffer);
-            return new String(buffer.toArray(ValueLayout.JAVA_CHAR));
-        }
-    }
-}
diff --git a/app/desktop/src/main/kotlin/ConfigFile.kt b/app/desktop/src/main/kotlin/ConfigFile.kt
index eff3956..eeec0c2 100644
--- a/app/desktop/src/main/kotlin/ConfigFile.kt
+++ b/app/desktop/src/main/kotlin/ConfigFile.kt
@@ -13,15 +13,9 @@ import java.nio.file.StandardOpenOption
 import kotlin.io.path.*
 
 val windowsAppDataFolder: String? by lazy {
-    val result = runCatching {
-        NativeUtil.getAppdataFolder()
-    }
-
-    if (result.isFailure) {
-        result.exceptionOrNull()!!.printStackTrace()
-    }
-
-    result.getOrNull()
+    runCatching { getAppDataRoaming() }
+        .onFailure(Throwable::printStackTrace)
+        .getOrNull()
 }
 
 @Serializable
diff --git a/app/desktop/src/main/kotlin/NativeUtil.kt b/app/desktop/src/main/kotlin/NativeUtil.kt
new file mode 100644
index 0000000..ae5301e
--- /dev/null
+++ b/app/desktop/src/main/kotlin/NativeUtil.kt
@@ -0,0 +1,37 @@
+package dev.schlaubi.tonbrett.app.desktop
+
+import dev.schlaubi.tonbrett.app.desktop.uwp_helper.AppDataRoamingResult.`is_error$get`
+import dev.schlaubi.tonbrett.app.desktop.uwp_helper.AppDataRoamingResult.`length$get`
+import dev.schlaubi.tonbrett.app.desktop.uwp_helper.UwpHelper.*
+import java.lang.foreign.Arena
+import java.net.URI
+
+/**
+ * Tries to launch the URI using the UWP `Launcher`.
+ *
+ * @param uri the [URI] to launch
+ */
+fun launchUri(uri: URI) = Arena.openConfined().use { arena ->
+    val url = arena.allocateUtf8String(uri.toString())
+    launch_uri(url)
+}
+
+/**
+ * Tries to retrieve the current UWP app data folder.
+ *
+ * @return the absolute path to the folder
+ */
+fun getAppDataRoaming() = Arena.openConfined().use { arena ->
+    val result = get_app_data_roaming(arena)
+    val isError = `is_error$get`(result)
+    val length = `length$get`(result).coerceAtLeast(0)
+    val buffer = arena.allocateArray(uint16_t, length)
+    copy_string_from_get_app_data_roaming_result_into_buffer(result, buffer)
+    val shortArray = buffer.toArray(uint16_t)
+    val charArray = CharArray(shortArray.size)
+    for ((index, short) in shortArray.withIndex()) {
+        charArray[index] = short.toInt().toChar()
+    }
+    val string = String(charArray)
+    if (isError) throw Exception(string) else string
+}
diff --git a/app/desktop/src/main/kotlin/URIUtil.kt b/app/desktop/src/main/kotlin/URIUtil.kt
index 2d2fa1a..c581db6 100644
--- a/app/desktop/src/main/kotlin/URIUtil.kt
+++ b/app/desktop/src/main/kotlin/URIUtil.kt
@@ -5,7 +5,7 @@ import java.net.URI
 
 fun browseUrl(url: URI) {
     if (System.getProperty("os.name").contains("windows", ignoreCase = true) && windowsAppDataFolder != null) {
-        NativeUtil.launchUri(url)
+        launchUri(url)
     } else {
         val desktop = Desktop.getDesktop()
         if (desktop.isSupported(Desktop.Action.BROWSE)) {
diff --git a/app/desktop/uwp_helper/Cargo.lock b/app/desktop/uwp_helper/Cargo.lock
index 056c9d1..f899096 100644
--- a/app/desktop/uwp_helper/Cargo.lock
+++ b/app/desktop/uwp_helper/Cargo.lock
@@ -17,6 +17,23 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi 0.1.19",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
 [[package]]
 name = "backtrace"
 version = "0.3.68"
@@ -32,6 +49,37 @@ dependencies = [
  "rustc-demangle",
 ]
 
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "bitflags"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4682ae6287fcf752ecaabbfcc7b6f9b72aa33933dc23a554d853aea8eea8635"
+
+[[package]]
+name = "cbindgen"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "faeaa693e5a727975a79211b8f35c0cb09b031fdb6eaa4a788bc6713d01488ca"
+dependencies = [
+ "clap",
+ "heck",
+ "indexmap",
+ "log",
+ "proc-macro2",
+ "quote",
+ "serde",
+ "serde_json",
+ "syn 1.0.109",
+ "tempfile",
+ "toml",
+]
+
 [[package]]
 name = "cc"
 version = "1.0.82"
@@ -47,12 +95,84 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "clap"
+version = "3.2.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ea181bf566f71cb9a5d17a59e1871af638180a18fb0035c92ae62b705207123"
+dependencies = [
+ "atty",
+ "bitflags 1.3.2",
+ "clap_lex",
+ "indexmap",
+ "strsim",
+ "termcolor",
+ "textwrap",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
+dependencies = [
+ "os_str_bytes",
+]
+
+[[package]]
+name = "errno"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "136526188508e25c6fef639d7927dfb3e0e3084488bf202267829cf7fc23dbdd"
+dependencies = [
+ "errno-dragonfly",
+ "libc",
+ "windows-sys",
+]
+
+[[package]]
+name = "errno-dragonfly"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa68f1b12764fab894d2755d2518754e71b4fd80ecfb822714a1206c2aab39bf"
+dependencies = [
+ "cc",
+ "libc",
+]
+
+[[package]]
+name = "fastrand"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6999dc1837253364c2ebb0704ba97994bd874e8f195d665c50b7548f6ea92764"
+
 [[package]]
 name = "gimli"
 version = "0.27.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6c80984affa11d98d1b88b66ac8853f143217b399d3c74116778ff8fdb4ed2e"
 
+[[package]]
+name = "hashbrown"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+
+[[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
+[[package]]
+name = "hermit-abi"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "hermit-abi"
 version = "0.3.2"
@@ -60,10 +180,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
 
 [[package]]
-name = "lazy_static"
-version = "1.4.0"
+name = "indexmap"
+version = "1.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
+dependencies = [
+ "autocfg",
+ "hashbrown",
+]
+
+[[package]]
+name = "itoa"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
 [[package]]
 name = "libc"
@@ -71,6 +201,18 @@ version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
+[[package]]
+name = "linux-raw-sys"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57bcfdad1b858c2db7c38303a6d2ad4dfaf5eb53dfeb0910128b2c26d6158503"
+
+[[package]]
+name = "log"
+version = "0.4.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
+
 [[package]]
 name = "memchr"
 version = "2.5.0"
@@ -92,7 +234,7 @@ version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
 dependencies = [
- "hermit-abi",
+ "hermit-abi 0.3.2",
  "libc",
 ]
 
@@ -105,6 +247,12 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "os_str_bytes"
+version = "6.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d5d9eb14b174ee9aa2ef96dc2b94637a2d4b6e7cb873c7e171f0c20c6cf3eac"
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.12"
@@ -129,12 +277,88 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
+dependencies = [
+ "bitflags 1.3.2",
+]
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
 
+[[package]]
+name = "rustix"
+version = "0.38.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed6248e1caa625eb708e266e06159f135e8c26f2bb7ceb72dc4b2766d0340964"
+dependencies = [
+ "bitflags 2.4.0",
+ "errno",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys",
+]
+
+[[package]]
+name = "ryu"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ad4cc8da4ef723ed60bced201181d83791ad433213d8c24efffda1eec85d741"
+
+[[package]]
+name = "serde"
+version = "1.0.188"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf9e0fcba69a370eed61bcf2b728575f726b50b55cba78064753d708ddc7549e"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.188"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4eca7ac642d82aa35b60049a6eccb4be6be75e599bd2e9adb5f875a737654af2"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.28",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "693151e1ac27563d6dbcec9dee9fbd5da8539b20fa14ad3752b2e6d363ace360"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.28"
@@ -146,6 +370,34 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tempfile"
+version = "3.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb94d2f3cc536af71caac6b6fcebf65860b347e7ce0cc9ebe8f70d3e521054ef"
+dependencies = [
+ "cfg-if",
+ "fastrand",
+ "redox_syscall",
+ "rustix",
+ "windows-sys",
+]
+
+[[package]]
+name = "termcolor"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be55cf8942feac5c765c2c993422806843c9a9a45d4d5c407ad6dd2ea95eb9b6"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "222a222a5bfe1bba4a77b45ec488a741b3cb8872e5e499451fd7d0129c9c7c3d"
+
 [[package]]
 name = "tokio"
 version = "1.31.0"
@@ -166,7 +418,16 @@ checksum = "630bdcf245f78637c13ec01ffae6187cca34625e8c63150d424b59e55af2675e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.28",
+]
+
+[[package]]
+name = "toml"
+version = "0.5.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4f7f0dd8d50a853a531c426359045b1998f04219d88799810762cd4ad314234"
+dependencies = [
+ "serde",
 ]
 
 [[package]]
@@ -179,25 +440,75 @@ checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 name = "uwp_helper"
 version = "0.1.0"
 dependencies = [
- "lazy_static",
+ "cbindgen",
  "tokio",
  "windows",
 ]
 
+[[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 = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+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"
+version = "0.51.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca229916c5ee38c2f2bc1e9d8f04df975b4bd93f9955dc69fabb5d91270045c9"
+dependencies = [
+ "windows-core",
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-core"
+version = "0.51.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1f8cf84f35d2db49a46868f947758c7a1138116f7fac3bc844f43ade1292e64"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-sys"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
 dependencies = [
  "windows-targets",
 ]
 
 [[package]]
 name = "windows-targets"
-version = "0.48.2"
+version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d1eeca1c172a285ee6c2c84c341ccea837e7c01b12fbb2d0fe3c9e550ce49ec8"
+checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
 dependencies = [
  "windows_aarch64_gnullvm",
  "windows_aarch64_msvc",
@@ -210,42 +521,42 @@ dependencies = [
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.48.2"
+version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b10d0c968ba7f6166195e13d593af609ec2e3d24f916f081690695cf5eaffb2f"
+checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.48.2"
+version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "571d8d4e62f26d4932099a9efe89660e8bd5087775a2ab5cdd8b747b811f1058"
+checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.48.2"
+version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2229ad223e178db5fbbc8bd8d3835e51e566b8474bfca58d2e6150c48bb723cd"
+checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.48.2"
+version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "600956e2d840c194eedfc5d18f8242bc2e17c7775b6684488af3a9fff6fe3287"
+checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.48.2"
+version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea99ff3f8b49fb7a8e0d305e5aec485bd068c2ba691b6e277d29eaeac945868a"
+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.48.2"
+version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f1a05a1ece9a7a0d5a7ccf30ba2c33e3a61a30e042ffd247567d1de1d94120d"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.48.2"
+version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d419259aba16b663966e29e6d7c6ecfa0bb8425818bb96f6f1f3c3eb71a6e7b9"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
diff --git a/app/desktop/uwp_helper/Cargo.toml b/app/desktop/uwp_helper/Cargo.toml
index 3783d16..86d740a 100644
--- a/app/desktop/uwp_helper/Cargo.toml
+++ b/app/desktop/uwp_helper/Cargo.toml
@@ -2,17 +2,18 @@
 name = "uwp_helper"
 version = "0.1.0"
 edition = "2021"
+build = "build.rs"
 
 [lib]
 crate-type = ["cdylib"]
 
-[dependencies]
-lazy_static = "1.4.0"
-
 [dependencies.windows]
-version = "0.48.0"
+version = "0.51.1"
 features = ["System", "Foundation", "Storage", "Win32_Foundation"]
 
 [dependencies.tokio]
 version = "1.29.1"
 features = ["macros", "rt-multi-thread"]
+
+[build-dependencies]
+cbindgen = "0.25.0"
diff --git a/app/desktop/uwp_helper/build.gradle.kts b/app/desktop/uwp_helper/build.gradle.kts
new file mode 100644
index 0000000..4aba333
--- /dev/null
+++ b/app/desktop/uwp_helper/build.gradle.kts
@@ -0,0 +1,47 @@
+plugins {
+    java
+}
+
+val jextractOutput: Provider<Directory> = layout.buildDirectory.dir("generated/jextract/main/java")
+
+sourceSets {
+    main {
+        java.srcDir(jextractOutput)
+    }
+}
+
+tasks {
+    val compileRust by registering(Exec::class) {
+        inputs.dir("src")
+        outputs.dir("target")
+
+        commandLine("cargo", "build", "--release")
+    }
+
+    val generateBindingsWithJextract by registering(Exec::class) {
+        dependsOn(compileRust)
+        val header = "target/uwp_helper.h"
+        inputs.file(header)
+        outputs.dir(jextractOutput)
+
+        commandLine(
+            "jextract",
+            "--header-class-name", "UwpHelper",
+            "--target-package", "dev.schlaubi.tonbrett.app.desktop.uwp_helper",
+            "--library", "uwp_helper",
+            "--output", jextractOutput.get().asFile.absolutePath,
+            "--source",
+            "--include-function", "launch_uri",
+            "--include-function", "get_app_data_roaming",
+            "--include-function", "copy_string_from_get_app_data_roaming_result_into_buffer",
+            "--include-struct", "AppDataRoamingResult",
+            "--include-typedef", "uint16_t",
+            header,
+        )
+    }
+
+    compileJava {
+        dependsOn(generateBindingsWithJextract)
+        options.compilerArgs.add("--enable-preview")
+    }
+}
diff --git a/app/desktop/uwp_helper/build.rs b/app/desktop/uwp_helper/build.rs
new file mode 100644
index 0000000..10b45f1
--- /dev/null
+++ b/app/desktop/uwp_helper/build.rs
@@ -0,0 +1,35 @@
+extern crate cbindgen;
+
+use std::env;
+use std::path::PathBuf;
+
+use cbindgen::{Config, Language};
+
+fn main() {
+    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+
+    let package_name = env::var("CARGO_PKG_NAME").unwrap();
+    let output_file = target_dir()
+        .join(format!("{}.h", package_name))
+        .display()
+        .to_string();
+
+    let mut config = Config::default();
+    config.language = Language::C;
+    config.includes.push(String::from("Hstring.h"));
+
+    cbindgen::generate_with_config(&crate_dir, config)
+        .unwrap()
+        .write_to_file(&output_file);
+}
+
+/// Find the location of the `target/` directory. Note that this may be
+/// overridden by `cmake`, so we also need to check the `CARGO_TARGET_DIR`
+/// variable.
+fn target_dir() -> PathBuf {
+    if let Ok(target) = env::var("CARGO_TARGET_DIR") {
+        PathBuf::from(target)
+    } else {
+        PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap()).join("target")
+    }
+}
diff --git a/app/desktop/uwp_helper/src/lib.rs b/app/desktop/uwp_helper/src/lib.rs
index 2a7762d..82e54b4 100644
--- a/app/desktop/uwp_helper/src/lib.rs
+++ b/app/desktop/uwp_helper/src/lib.rs
@@ -1,6 +1,3 @@
-#[macro_use]
-extern crate lazy_static;
-
 use std::ffi::{c_char, CStr};
 
 use windows::{
@@ -12,11 +9,6 @@ use windows::{
     Win32::Foundation::E_FAIL,
 };
 
-lazy_static! {
-    static ref APPDATA_FOLDER: Result<HSTRING> =
-        ApplicationData::Current()?.RoamingFolder()?.Path();
-}
-
 #[tokio::main]
 #[no_mangle]
 pub async unsafe extern "C" fn launch_uri(uri: *const c_char) {
@@ -24,23 +16,6 @@ pub async unsafe extern "C" fn launch_uri(uri: *const c_char) {
     _launch_uri(uri_str).await.unwrap()
 }
 
-#[no_mangle]
-pub extern "C" fn get_appdata_folder_path_length() -> usize {
-    APPDATA_FOLDER
-        .as_ref()
-        .map(|value| value.len())
-        .unwrap_or_else(|error| {
-            eprintln!("{}", error);
-            0
-        })
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn get_appdata_folder(buf: *mut u16) {
-    let result = APPDATA_FOLDER.as_ref().unwrap();
-    buf.copy_from(result.as_ptr(), result.len())
-}
-
 async fn _launch_uri(uri: &str) -> Result<()> {
     let actual_uri = Uri::CreateUri(&HSTRING::from(uri))?;
 
@@ -48,3 +23,28 @@ async fn _launch_uri(uri: &str) -> Result<()> {
 
     result.then(|| {}).ok_or(Error::from(E_FAIL))
 }
+
+#[repr(C)]
+pub struct AppDataRoamingResult {
+    is_error: bool,
+    length: usize,
+    string: HSTRING,
+}
+
+#[no_mangle]
+pub extern "C" fn get_app_data_roaming() -> AppDataRoamingResult {
+    let (string, is_error) = ApplicationData::Current()
+        .and_then(|ad| ad.RoamingFolder())
+        .and_then(|sf| sf.Path())
+        .map(|p| (p, false))
+        .unwrap_or_else(|e| (e.message(), true));
+    AppDataRoamingResult { is_error, length: string.len(), string }
+}
+
+#[no_mangle]
+pub extern "C" fn copy_string_from_get_app_data_roaming_result_into_buffer(
+    result: AppDataRoamingResult,
+    buffer: *mut u16,
+) {
+    unsafe { buffer.copy_from(result.string.as_ptr(), result.length) }
+}
diff --git a/build.gradle.kts b/build.gradle.kts
index ecf7ff0..2442791 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -18,11 +18,9 @@ allprojects {
 }
 
 subprojects {
-    if (name != "app") {
-        afterEvaluate {
-            configure<KotlinTopLevelExtension> {
-                jvmToolchain(20)
-            }
+    afterEvaluate {
+        extensions.findByType<KotlinTopLevelExtension>()?.apply {
+            jvmToolchain(20)
         }
     }
 }
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 8180d3f..f86e95e 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -22,7 +22,7 @@ include(
     ":app:shared",
     ":app:web",
     ":app:desktop",
+    ":app:desktop:uwp_helper",
     ":app:android",
     ":app:ios"
 )
-