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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "net/base/net_string_util_icu_alternatives_android.h"
      6 
      7 #include "base/android/jni_android.h"
      8 #include "base/android/jni_string.h"
      9 #include "base/strings/string16.h"
     10 #include "base/strings/string_piece.h"
     11 #include "jni/NetStringUtil_jni.h"
     12 #include "net/base/net_string_util.h"
     13 
     14 namespace net {
     15 
     16 namespace {
     17 
     18 // Attempts to convert |text| encoded in |charset| to a jstring (Java unicode
     19 // string).  Returns the result jstring, or NULL on failure.
     20 ScopedJavaLocalRef<jstring> ConvertToJstring(const std::string& text,
     21                                              const char* charset) {
     22   JNIEnv* env = base::android::AttachCurrentThread();
     23   jobject java_byte_buffer =
     24       env->NewDirectByteBuffer(const_cast<char*>(text.data()), text.length());
     25   base::android::ScopedJavaLocalRef<jstring> java_charset =
     26       base::android::ConvertUTF8ToJavaString(env, base::StringPiece(charset));
     27   ScopedJavaLocalRef<jstring> java_result =
     28       android::Java_NetStringUtil_convertToUnicode(env, java_byte_buffer,
     29                                                    java_charset.obj());
     30   return java_result;
     31 }
     32 
     33 // Attempts to convert |text| encoded in |charset| to a jstring (Java unicode
     34 // string) and then normalizes the string.  Returns the result jstring, or NULL
     35 // on failure.
     36 ScopedJavaLocalRef<jstring> ConvertToNormalizedJstring(
     37     const std::string& text, const char* charset) {
     38   JNIEnv* env = base::android::AttachCurrentThread();
     39   jobject java_byte_buffer =
     40       env->NewDirectByteBuffer(const_cast<char*>(text.data()), text.length());
     41   base::android::ScopedJavaLocalRef<jstring> java_charset =
     42       base::android::ConvertUTF8ToJavaString(env, base::StringPiece(charset));
     43   ScopedJavaLocalRef<jstring> java_result =
     44       android::Java_NetStringUtil_convertToUnicodeAndNormalize(
     45           env, java_byte_buffer, java_charset.obj());
     46   return java_result;
     47 }
     48 
     49 // Converts |text| encoded in |charset| to a jstring (Java unicode string).
     50 // Any characters that can not be converted are replaced with U+FFFD.
     51 ScopedJavaLocalRef<jstring> ConvertToJstringWithSubstitutions(
     52     const std::string& text, const char* charset) {
     53   JNIEnv* env = base::android::AttachCurrentThread();
     54   jobject java_byte_buffer =
     55       env->NewDirectByteBuffer(const_cast<char*>(text.data()), text.length());
     56   base::android::ScopedJavaLocalRef<jstring> java_charset =
     57       base::android::ConvertUTF8ToJavaString(env, base::StringPiece(charset));
     58   ScopedJavaLocalRef<jstring> java_result =
     59       android::Java_NetStringUtil_convertToUnicodeWithSubstitutions(
     60           env, java_byte_buffer, java_charset.obj());
     61   return java_result;
     62 }
     63 
     64 }  // namespace
     65 
     66 const char* const kCharsetLatin1 = "ISO-8859-1";
     67 
     68 bool ConvertToUtf8(const std::string& text, const char* charset,
     69                    std::string* output) {
     70   output->clear();
     71   ScopedJavaLocalRef<jstring> java_result = ConvertToJstring(text, charset);
     72   if (java_result.is_null())
     73     return false;
     74   *output = base::android::ConvertJavaStringToUTF8(java_result);
     75   return true;
     76 }
     77 
     78 bool ConvertToUtf8AndNormalize(const std::string& text, const char* charset,
     79                                std::string* output) {
     80   output->clear();
     81   ScopedJavaLocalRef<jstring> java_result = ConvertToNormalizedJstring(
     82       text, charset);
     83   if (java_result.is_null())
     84     return false;
     85   *output = base::android::ConvertJavaStringToUTF8(java_result);
     86   return true;
     87 }
     88 
     89 bool ConvertToUTF16(const std::string& text, const char* charset,
     90                     base::string16* output) {
     91   output->clear();
     92   ScopedJavaLocalRef<jstring> java_result = ConvertToJstring(text, charset);
     93   if (java_result.is_null())
     94     return false;
     95   *output = base::android::ConvertJavaStringToUTF16(java_result);
     96   return true;
     97 }
     98 
     99 bool ConvertToUTF16WithSubstitutions(const std::string& text,
    100                                      const char* charset,
    101                                      base::string16* output) {
    102   output->clear();
    103   ScopedJavaLocalRef<jstring> java_result =
    104      ConvertToJstringWithSubstitutions(text, charset);
    105   if (java_result.is_null())
    106     return false;
    107   *output = base::android::ConvertJavaStringToUTF16(java_result);
    108   return true;
    109 }
    110 
    111 bool RegisterNetStringUtils(JNIEnv* env) {
    112   return android::RegisterNativesImpl(env);
    113 }
    114 
    115 }  // namespace net
    116