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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "stream_wrapper.h"
     18 
     19 const int32_t StreamWrapper::END_OF_STREAM = -1;
     20 const int32_t StreamWrapper::DEFAULT_BUFFER_SIZE = 1 << 16;  // 64Kb
     21 
     22 StreamWrapper::StreamWrapper() : mEnv(NULL),
     23                                  mStream(NULL),
     24                                  mByteArray(NULL),
     25                                  mBytes(NULL),
     26                                  mByteArrayLen(0) {}
     27 
     28 StreamWrapper::~StreamWrapper() {
     29     cleanup();
     30 }
     31 
     32 void StreamWrapper::updateEnv(JNIEnv *env) {
     33     if (env == NULL) {
     34         LOGE("Cannot update StreamWrapper with a null JNIEnv pointer!");
     35         return;
     36     }
     37     mEnv = env;
     38 }
     39 
     40 bool StreamWrapper::init(JNIEnv *env, jobject stream) {
     41     if (mEnv != NULL) {
     42         LOGW("StreamWrapper already initialized!");
     43         return false;
     44     }
     45     mEnv = env;
     46     mStream = env->NewGlobalRef(stream);
     47     if (mStream == NULL || env->ExceptionCheck()) {
     48         cleanup();
     49         return false;
     50     }
     51     mByteArrayLen = DEFAULT_BUFFER_SIZE;
     52     jbyteArray tmp = env->NewByteArray(getBufferSize());
     53     if (tmp == NULL || env->ExceptionCheck()){
     54         cleanup();
     55         return false;
     56     }
     57     mByteArray = reinterpret_cast<jbyteArray>(env->NewGlobalRef(tmp));
     58     if (mByteArray == NULL || env->ExceptionCheck()){
     59         cleanup();
     60         return false;
     61     }
     62     mBytes = env->GetByteArrayElements(mByteArray, NULL);
     63     if (mBytes == NULL || env->ExceptionCheck()){
     64         cleanup();
     65         return false;
     66     }
     67     return true;
     68 }
     69 
     70 void StreamWrapper::cleanup() {
     71     if (mEnv != NULL) {
     72         if (mStream != NULL) {
     73             mEnv->DeleteGlobalRef(mStream);
     74             mStream = NULL;
     75         }
     76         if (mByteArray != NULL) {
     77             if (mBytes != NULL) {
     78                 mEnv->ReleaseByteArrayElements(mByteArray, mBytes, JNI_ABORT);
     79                 mBytes = NULL;
     80             }
     81             mEnv->DeleteGlobalRef(mByteArray);
     82             mByteArray = NULL;
     83         } else {
     84             mBytes = NULL;
     85         }
     86         mByteArrayLen = 0;
     87         mEnv = NULL;
     88     }
     89 }
     90 
     91 int32_t StreamWrapper::getBufferSize() {
     92     return mByteArrayLen;
     93 }
     94 
     95 jbyte* StreamWrapper::getBufferPtr() {
     96     return mBytes;
     97 }
     98