1 files changed, 63 insertions, 0 deletions
diff --git a/samples/android_helper.cc b/samples/android_helper.cc
new file mode 100644
index 0000000..7da69ad
--- /dev/null
+++ b/samples/android_helper.cc
@@ -0,0 +1,63 @@
+// Copyright 2019 The Amber Authors.
+//
+// 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 <jni.h>
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+extern int android_main(int argc, const char** argv);
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wmissing-prototypes"
+#pragma ide diagnostic ignored "OCUnusedGlobalDeclarationInspection"
+
+extern "C" JNIEXPORT JNICALL int Java_com_google_amber_Amber_androidHelper(
+    JNIEnv* env,
+    jobject,
+    jobjectArray args,
+    jstring stdoutFile,
+    jstring stderrFile) {
+  const char* stdout_file_cstr = env->GetStringUTFChars(stdoutFile, nullptr);
+  const char* stderr_file_cstr = env->GetStringUTFChars(stderrFile, nullptr);
+
+  // Redirect std output to a file
+  freopen(stdout_file_cstr, "w", stdout);
+  freopen(stderr_file_cstr, "w", stderr);
+
+  env->ReleaseStringUTFChars(stdoutFile, stdout_file_cstr);
+  env->ReleaseStringUTFChars(stderrFile, stderr_file_cstr);
+
+  jsize arg_count = env->GetArrayLength(args);
+
+  std::vector<std::string> argv_string;
+  argv_string.push_back("amber");
+
+  for (jsize i = 0; i < arg_count; i++) {
+    jstring js = static_cast<jstring>(env->GetObjectArrayElement(args, i));
+    const char* arg_cstr = env->GetStringUTFChars(js, nullptr);
+    argv_string.push_back(arg_cstr);
+    env->ReleaseStringUTFChars(js, arg_cstr);
+  }
+
+  std::vector<const char*> argv;
+
+  for (const std::string& arg : argv_string)
+    argv.push_back(arg.c_str());
+
+  return android_main(static_cast<int>(argv.size()), argv.data());
+}
+
+#pragma clang diagnostic pop