Android's paths and message loop implementation with JNI

base/android/jni_string.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/android/jni_string.h"
+
+#include "base/android/jni_android.h"
+#include "base/logging.h"
+#include "base/utf_string_conversions.h"
+
+namespace base {
+namespace android {
+
+std::string ConvertJavaStringToUTF8(JNIEnv* env, jstring str) {
+  // JNI's GetStringUTFChars() returns strings in Java-modified UTF8, so we

[M-A Ruel, 2011/11/11 13:09:07]

This seems relatively inefficient in a potentially hot function, why aren't you
using the base::android::ConvertJavaStringToUTF8() function?

+  // instead get the String in UTF16 and convert using our own utility function.
+  return UTF16ToUTF8(ConvertJavaStringToUTF16(env, str));
+}
+
+jstring ConvertUTF8ToJavaString(JNIEnv* env, const std::string& str) {
+  jstring result = env->NewStringUTF(str.c_str());
+  CheckException(env);
+  return result;
+}
+
+string16 ConvertJavaStringToUTF16(JNIEnv* env, jstring str) {
+  const jchar* chars = env->GetStringChars(str, NULL);
+  DCHECK(chars);
+  // GetStringChars isn't required to NULL-terminate the strings
+  // it returns, so the length must be explicitly checked.
+  string16 result(chars, env->GetStringLength(str));
+  env->ReleaseStringChars(str, chars);
+  CheckException(env);
+  return result;
+}
+
+jstring ConvertUTF16ToJavaString(JNIEnv* env, const string16& str) {
+  jstring result = env->NewString(str.data(), str.length());
+  CheckException(env);
+  return result;
+}
+
+}  // namespace android
+}  // namespace base