Add support for accessing native bidi implementation via jni.

Include a simple test to verify that the bidi code works.

1 files changed, 81 insertions, 0 deletions

diff --git a/core/jni/android_text_AndroidBidi.cpp b/core/jni/android_text_AndroidBidi.cpp
new file mode 100644
index 0000000..7696bb3
--- /dev/null
+++ b/core/jni/android_text_AndroidBidi.cpp
@@ -0,0 +1,81 @@
+/* //device/libs/android_runtime/android_text_AndroidBidi.cpp
+**
+** Copyright 2010, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#define LOG_TAG "AndroidUnicode"
+
+#include <jni.h>
+#include <android_runtime/AndroidRuntime.h>
+#include "utils/misc.h"
+#include "utils/Log.h"
+#include "unicode/ubidi.h"
+
+namespace android {
+    
+static void jniThrowException(JNIEnv* env, const char* exc, const char* msg = NULL)
+{
+    jclass excClazz = env->FindClass(exc);
+    LOG_ASSERT(excClazz, "Unable to find class %s", exc);
+
+    env->ThrowNew(excClazz, msg);
+}
+
+static jint runBidi(JNIEnv* env, jobject obj, jint dir, jcharArray chsArray, 
+                    jbyteArray infoArray, int n, jboolean haveInfo)
+{
+    // Parameters are checked on java side
+    // Failures from GetXXXArrayElements indicate a serious out-of-memory condition
+    // that we don't bother to report, we're probably dead anyway.
+    jint result = 0;
+    jchar* chs = env->GetCharArrayElements(chsArray, NULL);
+    if (chs != NULL) {
+        jbyte* info = env->GetByteArrayElements(infoArray, NULL);
+        if (info != NULL) {
+            UErrorCode status = U_ZERO_ERROR;
+            UBiDi* bidi = ubidi_openSized(n, 0, &status);
+            ubidi_setPara(bidi, chs, n, dir, NULL, &status);
+            if (U_SUCCESS(status)) {
+                for (int i = 0; i < n; ++i) {
+                  info[i] = ubidi_getLevelAt(bidi, i);
+                }
+                result = ubidi_getParaLevel(bidi);
+            } else {
+                jniThrowException(env, "java/lang/RuntimeException", NULL);
+            }
+            ubidi_close(bidi);
+
+            env->ReleaseByteArrayElements(infoArray, info, 0);
+        }
+        env->ReleaseCharArrayElements(chsArray, chs, JNI_ABORT);
+    }
+    return result;
+}
+
+static JNINativeMethod gMethods[] = {
+        { "runBidi", "(I[C[BIZ)I",
+        (void*) runBidi }
+};
+
+int register_android_text_AndroidBidi(JNIEnv* env)
+{
+    jclass clazz = env->FindClass("android/text/AndroidBidi");
+    LOG_ASSERT(clazz, "Cannot find android/text/AndroidBidi");
+    
+    return AndroidRuntime::registerNativeMethods(env, "android/text/AndroidBidi",
+            gMethods, NELEM(gMethods));
+}
+
+}