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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #define LOG_TAG "NativeIDN"
     18 
     19 #include "ErrorCode.h"
     20 #include "JNIHelp.h"
     21 #include "JniConstants.h"
     22 #include "ScopedJavaUnicodeString.h"
     23 #include "unicode/uidna.h"
     24 
     25 static bool isLabelSeparator(const UChar ch) {
     26     switch (ch) {
     27     case 0x3002: // ideographic full stop
     28     case 0xff0e: // fullwidth full stop
     29     case 0xff61: // halfwidth ideographic full stop
     30         return true;
     31     default:
     32         return false;
     33     }
     34 }
     35 
     36 static jstring NativeIDN_convertImpl(JNIEnv* env, jclass, jstring s, jint flags, jboolean toAscii) {
     37     ScopedJavaUnicodeString sus(env, s);
     38     const UChar* src = sus.unicodeString().getBuffer();
     39     const size_t srcLength = sus.unicodeString().length();
     40     UChar dst[256];
     41     UErrorCode status = U_ZERO_ERROR;
     42     size_t resultLength = toAscii
     43             ? uidna_IDNToASCII(src, srcLength, &dst[0], sizeof(dst), flags, NULL, &status)
     44             : uidna_IDNToUnicode(src, srcLength, &dst[0], sizeof(dst), flags, NULL, &status);
     45     if (U_FAILURE(status)) {
     46         jniThrowException(env, "java/lang/IllegalArgumentException", u_errorName(status));
     47         return NULL;
     48     }
     49     if (!toAscii) {
     50         // ICU only translates separators to ASCII for toASCII.
     51         // Java expects the translation for toUnicode too.
     52         // We may as well do this here, while the string is still mutable.
     53         for (size_t i = 0; i < resultLength; ++i) {
     54             if (isLabelSeparator(dst[i])) {
     55                 dst[i] = '.';
     56             }
     57         }
     58     }
     59     return env->NewString(&dst[0], resultLength);
     60 }
     61 
     62 static JNINativeMethod gMethods[] = {
     63     NATIVE_METHOD(NativeIDN, convertImpl, "(Ljava/lang/String;IZ)Ljava/lang/String;"),
     64 };
     65 int register_libcore_icu_NativeIDN(JNIEnv* env) {
     66     return jniRegisterNativeMethods(env, "libcore/icu/NativeIDN", gMethods, NELEM(gMethods));
     67 }
     68