android_text_AndroidBidi.cpp revision f5df700e6ce056ebfa322314d970e52d6facc35a 
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 <android_runtime/AndroidRuntime.h>
22#include "utils/misc.h"
23#include "utils/Log.h"
24#include "unicode/ubidi.h"
25
26namespace android {
27
28static 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
59static JNINativeMethod gMethods[] = {
60        { "runBidi", "(I[C[BIZ)I",
61        (void*) runBidi }
62};
63
64int register_android_text_AndroidBidi(JNIEnv* env)
65{
66    return AndroidRuntime::registerNativeMethods(env, "android/text/AndroidBidi",
67            gMethods, NELEM(gMethods));
68}
69
70}
71