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      1 /* //device/libs/android_runtime/android_util_StringBlock.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 "StringBlock"
     19 
     20 #include "jni.h"
     21 #include <nativehelper/JNIHelp.h>
     22 #include <utils/misc.h>
     23 #include <core_jni_helpers.h>
     24 #include <utils/Log.h>
     25 
     26 #include <androidfw/ResourceTypes.h>
     27 
     28 #include <stdio.h>
     29 
     30 namespace android {
     31 
     32 // ----------------------------------------------------------------------------
     33 
     34 static jlong android_content_StringBlock_nativeCreate(JNIEnv* env, jobject clazz,
     35                                                   jbyteArray bArray,
     36                                                   jint off, jint len)
     37 {
     38     if (bArray == NULL) {
     39         jniThrowNullPointerException(env, NULL);
     40         return 0;
     41     }
     42 
     43     jsize bLen = env->GetArrayLength(bArray);
     44     if (off < 0 || off >= bLen || len < 0 || len > bLen || (off+len) > bLen) {
     45         jniThrowException(env, "java/lang/IndexOutOfBoundsException", NULL);
     46         return 0;
     47     }
     48 
     49     jbyte* b = env->GetByteArrayElements(bArray, NULL);
     50     ResStringPool* osb = new ResStringPool(b+off, len, true);
     51     env->ReleaseByteArrayElements(bArray, b, 0);
     52 
     53     if (osb == NULL || osb->getError() != NO_ERROR) {
     54         jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
     55         delete osb;
     56         return 0;
     57     }
     58 
     59     return reinterpret_cast<jlong>(osb);
     60 }
     61 
     62 static jint android_content_StringBlock_nativeGetSize(JNIEnv* env, jobject clazz,
     63                                                    jlong token)
     64 {
     65     ResStringPool* osb = reinterpret_cast<ResStringPool*>(token);
     66     if (osb == NULL) {
     67         jniThrowNullPointerException(env, NULL);
     68         return 0;
     69     }
     70 
     71     return osb->size();
     72 }
     73 
     74 static jstring android_content_StringBlock_nativeGetString(JNIEnv* env, jobject clazz,
     75                                                         jlong token, jint idx)
     76 {
     77     ResStringPool* osb = reinterpret_cast<ResStringPool*>(token);
     78     if (osb == NULL) {
     79         jniThrowNullPointerException(env, NULL);
     80         return 0;
     81     }
     82 
     83     size_t len;
     84     const char* str8 = osb->string8At(idx, &len);
     85     if (str8 != NULL) {
     86         return env->NewStringUTF(str8);
     87     }
     88 
     89     const char16_t* str = osb->stringAt(idx, &len);
     90     if (str == NULL) {
     91         jniThrowException(env, "java/lang/IndexOutOfBoundsException", NULL);
     92         return 0;
     93     }
     94 
     95     return env->NewString((const jchar*)str, len);
     96 }
     97 
     98 static jintArray android_content_StringBlock_nativeGetStyle(JNIEnv* env, jobject clazz,
     99                                                          jlong token, jint idx)
    100 {
    101     ResStringPool* osb = reinterpret_cast<ResStringPool*>(token);
    102     if (osb == NULL) {
    103         jniThrowNullPointerException(env, NULL);
    104         return NULL;
    105     }
    106 
    107     const ResStringPool_span* spans = osb->styleAt(idx);
    108     if (spans == NULL) {
    109         return NULL;
    110     }
    111 
    112     const ResStringPool_span* pos = spans;
    113     int num = 0;
    114     while (pos->name.index != ResStringPool_span::END) {
    115         num++;
    116         pos++;
    117     }
    118 
    119     if (num == 0) {
    120         return NULL;
    121     }
    122 
    123     jintArray array = env->NewIntArray((num*sizeof(ResStringPool_span))/sizeof(jint));
    124     if (array == NULL) { // NewIntArray already threw OutOfMemoryError.
    125         return NULL;
    126     }
    127 
    128     num = 0;
    129     static const int numInts = sizeof(ResStringPool_span)/sizeof(jint);
    130     while (spans->name.index != ResStringPool_span::END) {
    131         env->SetIntArrayRegion(array,
    132                                   num*numInts, numInts,
    133                                   (jint*)spans);
    134         spans++;
    135         num++;
    136     }
    137 
    138     return array;
    139 }
    140 
    141 static void android_content_StringBlock_nativeDestroy(JNIEnv* env, jobject clazz,
    142                                                    jlong token)
    143 {
    144     ResStringPool* osb = reinterpret_cast<ResStringPool*>(token);
    145     if (osb == NULL) {
    146         jniThrowNullPointerException(env, NULL);
    147         return;
    148     }
    149 
    150     delete osb;
    151 }
    152 
    153 // ----------------------------------------------------------------------------
    154 
    155 /*
    156  * JNI registration.
    157  */
    158 static const JNINativeMethod gStringBlockMethods[] = {
    159     /* name, signature, funcPtr */
    160     { "nativeCreate",      "([BII)J",
    161             (void*) android_content_StringBlock_nativeCreate },
    162     { "nativeGetSize",      "(J)I",
    163             (void*) android_content_StringBlock_nativeGetSize },
    164     { "nativeGetString",    "(JI)Ljava/lang/String;",
    165             (void*) android_content_StringBlock_nativeGetString },
    166     { "nativeGetStyle",    "(JI)[I",
    167             (void*) android_content_StringBlock_nativeGetStyle },
    168     { "nativeDestroy",      "(J)V",
    169             (void*) android_content_StringBlock_nativeDestroy },
    170 };
    171 
    172 int register_android_content_StringBlock(JNIEnv* env)
    173 {
    174     return RegisterMethodsOrDie(env,
    175             "android/content/res/StringBlock", gStringBlockMethods, NELEM(gStringBlockMethods));
    176 }
    177 
    178 }; // namespace android
    179