Use zstd

examples/rules_foreign_cc/WORKSPACE

@@ -17,8 +17,8 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 http_archive(
     name = "rules_foreign_cc",
-    strip_prefix = "rules_foreign_cc-e5c7d6df6132ed88bb3a67f05dad188f4754474c",
-    url = "https://github.com/bazelbuild/rules_foreign_cc/archive/e5c7d6df6132ed88bb3a67f05dad188f4754474c.tar.gz",
+    strip_prefix = "rules_foreign_cc-d33d862abb4ce3ba178547ef58c9fcb24cec38ca",
+    url = "https://github.com/bazelbuild/rules_foreign_cc/archive/d33d862abb4ce3ba178547ef58c9fcb24cec38ca.tar.gz",
 )
 
 load("@rules_foreign_cc//foreign_cc:repositories.bzl", "rules_foreign_cc_dependencies")

examples/rules_foreign_cc/java/com/app/BUILD

@@ -24,12 +24,14 @@ cc_library(
     srcs = ["jni.cc"],
     deps = [
         ":jni_dep",
-        "@com_github_facebook_zstd//:zstd",
     ],
 )
 
 cc_library(
     name = "jni_dep",
     srcs = ["jni_dep.cc"],
     hdrs = ["jni_dep.h"],
+    deps = [
+        "@com_github_facebook_zstd//:zstd",
+    ],
 )

examples/rules_foreign_cc/java/com/app/Jni.java

@@ -1,21 +1,19 @@
-// Copyright 2022 The Bazel Authors. All rights reserved.
-// 
+// Copyright 2023 The Bazel Authors. All rights reserved.
+//
 // 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.
 
-
 package com.app;
 
 public class Jni {
-  public static native int getValue(int a);
+  public static native String getString();
 }
-

examples/rules_foreign_cc/java/com/app/MainActivity.java

@@ -1,11 +1,11 @@
-// Copyright 2022 The Bazel Authors. All rights reserved.
-// 
+// Copyright 2023 The Bazel Authors. All rights reserved.
+//
 // 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.
@@ -30,7 +30,7 @@ public void onCreate(Bundle savedInstanceState) {
 
     System.loadLibrary("app");
 
-    int valueFromNative = Jni.getValue(2);
+    String valueFromNative = Jni.getString();
 
     ((TextView) findViewById(R.id.text_from_native))
         .setText("Result from JNI: " + valueFromNative);

examples/rules_foreign_cc/java/com/app/jni.cc

@@ -1,11 +1,11 @@
-// Copyright 2022 The Bazel Authors. All rights reserved.
-// 
+// Copyright 2023 The Bazel Authors. All rights reserved.
+//
 // 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.
@@ -17,7 +17,7 @@
 
 #include "java/com/app/jni_dep.h"
 
-extern "C" JNIEXPORT int JNICALL
-Java_com_app_Jni_getValue(JNIEnv *env, jclass clazz, jint a) {
-  return calculate((int)a, 2);
+extern "C" JNIEXPORT jstring JNICALL
+Java_com_app_Jni_getString(JNIEnv *env, jclass clazz, jint a) {
+  return env->NewStringUTF(get_string().c_str());
 }

examples/rules_foreign_cc/java/com/app/jni_dep.cc

@@ -1,19 +1,32 @@
-// Copyright 2022 The Bazel Authors. All rights reserved.
-// 
+// Copyright 2023 The Bazel Authors. All rights reserved.
+//
 // 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.
 
+#include <vector>
+#include "zstd.h"
 #include "java/com/app/jni_dep.h"
 
-int calculate(int a, int b) {
-  return a + b * 20;
+std::string get_string() {
+  std::vector<char> input_buffer = {'H', 'e', 'l', 'l', 'o', ',', ' ', 'W', 'o', 'r', 'l', 'd', '!'};
+  std::vector<char> compressed_buffer(ZSTD_compressBound(input_buffer.size()));
+
+  // Compress the input buffer into the compressed buffer
+  size_t compressed_size = ZSTD_compress(compressed_buffer.data(), compressed_buffer.size(),
+      input_buffer.data(), input_buffer.size(), 1);
+
+  std::vector<char> decompressed_buffer(input_buffer.size());
+  size_t decompressed_size = ZSTD_decompress(decompressed_buffer.data(), decompressed_buffer.size(),
+      compressed_buffer.data(), compressed_size);
+
+  return std::string(decompressed_buffer.data(), decompressed_size);
 }

examples/rules_foreign_cc/java/com/app/jni_dep.h

@@ -1,11 +1,11 @@
-// Copyright 2022 The Bazel Authors. All rights reserved.
-// 
+// Copyright 2023 The Bazel Authors. All rights reserved.
+//
 // 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.
@@ -14,4 +14,6 @@
 
 #pragma once
 
-int calculate(int a, int b);
+#include <string>
+
+std::string get_string();