android_text_AndroidCharacter.cpp revision 54b6cfa9a9e5b861a9930af873580d6dc20f773c
1/* //device/libs/android_runtime/android_text_AndroidCharacter.cpp 2** 3** Copyright 2006, 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 <jni.h> 21#include <android_runtime/AndroidRuntime.h> 22#include "utils/misc.h" 23#include "utils/AndroidUnicode.h" 24#include "utils/Log.h" 25 26namespace android { 27 28static void jniThrowException(JNIEnv* env, const char* exc, const char* msg = NULL) 29{ 30 jclass excClazz = env->FindClass(exc); 31 LOG_ASSERT(excClazz, "Unable to find class %s", exc); 32 33 env->ThrowNew(excClazz, msg); 34} 35 36static void getDirectionalities(JNIEnv* env, jobject obj, jcharArray srcArray, jbyteArray destArray, int count) 37{ 38 jchar* src = env->GetCharArrayElements(srcArray, NULL); 39 jbyte* dest = env->GetByteArrayElements(destArray, NULL); 40 if (src == NULL || dest == NULL) { 41 jniThrowException(env, "java/lang/NullPointerException", NULL); 42 goto DIRECTION_END; 43 } 44 45 if (env->GetArrayLength(srcArray) < count || env->GetArrayLength(destArray) < count) { 46 jniThrowException(env, "java/lang/ArrayIndexException", NULL); 47 goto DIRECTION_END; 48 } 49 50 for (int i = 0; i < count; i++) { 51 if (src[i] >= 0xD800 && src[i] <= 0xDBFF && 52 i + 1 < count && 53 src[i + 1] >= 0xDC00 && src[i + 1] <= 0xDFFF) { 54 int c = 0x00010000 + ((src[i] - 0xD800) << 10) + 55 (src[i + 1] & 0x3FF); 56 int dir = android::Unicode::getDirectionality(c); 57 58 dest[i++] = dir; 59 dest[i] = dir; 60 } else { 61 int c = src[i]; 62 int dir = android::Unicode::getDirectionality(c); 63 64 dest[i] = dir; 65 } 66 } 67 68DIRECTION_END: 69 env->ReleaseCharArrayElements(srcArray, src, JNI_ABORT); 70 env->ReleaseByteArrayElements(destArray, dest, JNI_ABORT); 71} 72 73static jboolean mirror(JNIEnv* env, jobject obj, jcharArray charArray, int start, int count) 74{ 75 jchar* data = env->GetCharArrayElements(charArray, NULL); 76 bool ret = false; 77 78 if (data == NULL) { 79 jniThrowException(env, "java/lang/NullPointerException", NULL); 80 goto MIRROR_END; 81 } 82 83 if (start > start + count || env->GetArrayLength(charArray) < count) { 84 jniThrowException(env, "java/lang/ArrayIndexException", NULL); 85 goto MIRROR_END; 86 } 87 88 for (int i = start; i < start + count; i++) { 89 // XXX this thinks it knows that surrogates are never mirrored 90 91 int c1 = data[i]; 92 int c2 = android::Unicode::toMirror(c1); 93 94 if (c1 != c2) { 95 data[i] = c2; 96 ret = true; 97 } 98 } 99 100MIRROR_END: 101 env->ReleaseCharArrayElements(charArray, data, JNI_ABORT); 102 return ret; 103} 104 105static jchar getMirror(JNIEnv* env, jobject obj, jchar c) 106{ 107 return android::Unicode::toMirror(c); 108} 109 110static JNINativeMethod gMethods[] = { 111 { "getDirectionalities", "([C[BI)V", 112 (void*) getDirectionalities }, 113 { "mirror", "([CII)Z", 114 (void*) mirror }, 115 { "getMirror", "(C)C", 116 (void*) getMirror } 117}; 118 119int register_android_text_AndroidCharacter(JNIEnv* env) 120{ 121 jclass clazz = env->FindClass("android/text/AndroidCharacter"); 122 LOG_ASSERT(clazz, "Cannot find android/text/AndroidCharacter"); 123 124 return AndroidRuntime::registerNativeMethods(env, "android/text/AndroidCharacter", 125 gMethods, NELEM(gMethods)); 126} 127 128} 129