Implement alternative string conversion functions in net/ on Android,

net/base/net_string_util_icu_alternatives_android.cc

+// Copyright 2014 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 "net/base/net_string_util_icu_alternatives_android.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
+#include "jni/NetStringUtil_jni.h"
+#include "net/base/net_string_util.h"
+
+namespace net {
+
+namespace {
+
+// Attempts to convert |text| encoded in |charset| to a jstring (Java unicode
+// string).  Returns the result jstring, or NULL on failure.
+ScopedJavaLocalRef<jstring> ConvertToJstring(const std::string& text,
+                                             const char* charset) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  jobject java_byte_buffer =
+      env->NewDirectByteBuffer(const_cast<char*>(text.data()), text.length());
+  base::android::ScopedJavaLocalRef<jstring> java_charset =
+      base::android::ConvertUTF8ToJavaString(env, base::StringPiece(charset));
+  ScopedJavaLocalRef<jstring> java_result =
+      android::Java_NetStringUtil_convertToUnicode(env, java_byte_buffer,
+                                                   java_charset.obj());
+  return java_result;
+}
+
+// Attempts to convert |text| encoded in |charset| to a jstring (Java unicode
+// string) and then normalizes the string.  Returns the result jstring, or NULL
+// on failure.
+ScopedJavaLocalRef<jstring> ConvertToNormalizedJstring(
+    const std::string& text, const char* charset) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  jobject java_byte_buffer =
+      env->NewDirectByteBuffer(const_cast<char*>(text.data()), text.length());
+  base::android::ScopedJavaLocalRef<jstring> java_charset =
+      base::android::ConvertUTF8ToJavaString(env, base::StringPiece(charset));
+  ScopedJavaLocalRef<jstring> java_result =
+      android::Java_NetStringUtil_convertToUnicodeAndNormalize(
+          env, java_byte_buffer, java_charset.obj());
+  return java_result;
+}
+
+// Converts |text| encoded in |charset| to a jstring (Java unicode string).
+// Any characters that can not be converted are replaced with U+FFFD.
+ScopedJavaLocalRef<jstring> ConvertToJstringWithSubstitutions(
+    const std::string& text, const char* charset) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  jobject java_byte_buffer =
+      env->NewDirectByteBuffer(const_cast<char*>(text.data()), text.length());
+  base::android::ScopedJavaLocalRef<jstring> java_charset =
+      base::android::ConvertUTF8ToJavaString(env, base::StringPiece(charset));
+  ScopedJavaLocalRef<jstring> java_result =
+      android::Java_NetStringUtil_convertToUnicodeWithSubstitutions(
+          env, java_byte_buffer, java_charset.obj());
+  return java_result;
+}
+
+}  // namespace
+
+const char* const kCharsetLatin1 = "ISO-8859-1";
+
+bool ConvertToUtf8(const std::string& text, const char* charset,
+                   std::string* output) {
+  output->clear();
+  ScopedJavaLocalRef<jstring> java_result = ConvertToJstring(text, charset);
+  if (java_result.is_null())
+    return false;
+  *output = base::android::ConvertJavaStringToUTF8(java_result);
+  return true;
+}
+
+bool ConvertToUtf8AndNormalize(const std::string& text, const char* charset,
+                               std::string* output) {
+  output->clear();
+  ScopedJavaLocalRef<jstring> java_result = ConvertToNormalizedJstring(
+      text, charset);
+  if (java_result.is_null())
+    return false;
+  *output = base::android::ConvertJavaStringToUTF8(java_result);
+  return true;
+}
+
+bool ConvertToUTF16(const std::string& text, const char* charset,
+                    base::string16* output) {
+  output->clear();
+  ScopedJavaLocalRef<jstring> java_result = ConvertToJstring(text, charset);
+  if (java_result.is_null())
+    return false;
+  *output = base::android::ConvertJavaStringToUTF16(java_result);
+  return true;
+}
+
+bool ConvertToUTF16WithSubstitutions(const std::string& text,
+                                     const char* charset,
+                                     base::string16* output) {
+  output->clear();
+  ScopedJavaLocalRef<jstring> java_result =
+     ConvertToJstringWithSubstitutions(text, charset);
+  if (java_result.is_null())
+    return false;
+  *output = base::android::ConvertJavaStringToUTF16(java_result);
+  return true;
+}
+
+bool RegisterNetStringUtils(JNIEnv* env) {
+  return android::RegisterNativesImpl(env);
+}
+
+}  // namespace net