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      1 /* //device/libs/android_runtime/android_text_AndroidBidi.cpp
      2 **
      3 ** Copyright 2010, The Android Open Source Project
      4 **
      5 ** Licensed under the Apache License, Version 2.0 (the "License");
      6 ** you may not use this file except in compliance with the License.
      7 ** You may obtain a copy of the License at
      8 **
      9 **     http://www.apache.org/licenses/LICENSE-2.0
     10 **
     11 ** Unless required by applicable law or agreed to in writing, software
     12 ** distributed under the License is distributed on an "AS IS" BASIS,
     13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 ** See the License for the specific language governing permissions and
     15 ** limitations under the License.
     16 */
     17 
     18 #define LOG_TAG "AndroidUnicode"
     19 
     20 #include "JNIHelp.h"
     21 #include "core_jni_helpers.h"
     22 #include "utils/misc.h"
     23 #include "utils/Log.h"
     24 #include "unicode/ubidi.h"
     25 
     26 namespace android {
     27 
     28 static jint runBidi(JNIEnv* env, jobject obj, jint dir, jcharArray chsArray,
     29                     jbyteArray infoArray, jint n, jboolean haveInfo)
     30 {
     31     // Parameters are checked on java side
     32     // Failures from GetXXXArrayElements indicate a serious out-of-memory condition
     33     // that we don't bother to report, we're probably dead anyway.
     34     jint result = 0;
     35     jchar* chs = env->GetCharArrayElements(chsArray, NULL);
     36     if (chs != NULL) {
     37         jbyte* info = env->GetByteArrayElements(infoArray, NULL);
     38         if (info != NULL) {
     39             UErrorCode status = U_ZERO_ERROR;
     40             UBiDi* bidi = ubidi_openSized(n, 0, &status);
     41             ubidi_setPara(bidi, chs, n, dir, NULL, &status);
     42             if (U_SUCCESS(status)) {
     43                 for (int i = 0; i < n; ++i) {
     44                   info[i] = ubidi_getLevelAt(bidi, i);
     45                 }
     46                 result = ubidi_getParaLevel(bidi);
     47             } else {
     48                 jniThrowException(env, "java/lang/RuntimeException", NULL);
     49             }
     50             ubidi_close(bidi);
     51 
     52             env->ReleaseByteArrayElements(infoArray, info, 0);
     53         }
     54         env->ReleaseCharArrayElements(chsArray, chs, JNI_ABORT);
     55     }
     56     return result;
     57 }
     58 
     59 static JNINativeMethod gMethods[] = {
     60         { "runBidi", "(I[C[BIZ)I", (void*) runBidi }
     61 };
     62 
     63 int register_android_text_AndroidBidi(JNIEnv* env)
     64 {
     65     return RegisterMethodsOrDie(env, "android/text/AndroidBidi", gMethods, NELEM(gMethods));
     66 }
     67 
     68 }
     69