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/*
* Copyright (C) 2013 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.
*/
#include "stream_wrapper.h"
const int32_t StreamWrapper::END_OF_STREAM = -1;
const int32_t StreamWrapper::DEFAULT_BUFFER_SIZE = 1 << 16; // 64Kb
StreamWrapper::StreamWrapper() : mEnv(NULL),
mStream(NULL),
mByteArray(NULL),
mBytes(NULL),
mByteArrayLen(0) {}
StreamWrapper::~StreamWrapper() {
cleanup();
}
void StreamWrapper::updateEnv(JNIEnv *env) {
if (env == NULL) {
LOGE("Cannot update StreamWrapper with a null JNIEnv pointer!");
return;
}
mEnv = env;
}
bool StreamWrapper::init(JNIEnv *env, jobject stream) {
if (mEnv != NULL) {
LOGW("StreamWrapper already initialized!");
return false;
}
mEnv = env;
mStream = env->NewGlobalRef(stream);
if (mStream == NULL || env->ExceptionCheck()) {
cleanup();
return false;
}
mByteArrayLen = DEFAULT_BUFFER_SIZE;
jbyteArray tmp = env->NewByteArray(getBufferSize());
if (tmp == NULL || env->ExceptionCheck()){
cleanup();
return false;
}
mByteArray = reinterpret_cast<jbyteArray>(env->NewGlobalRef(tmp));
if (mByteArray == NULL || env->ExceptionCheck()){
cleanup();
return false;
}
mBytes = env->GetByteArrayElements(mByteArray, NULL);
if (mBytes == NULL || env->ExceptionCheck()){
cleanup();
return false;
}
return true;
}
void StreamWrapper::cleanup() {
if (mEnv != NULL) {
if (mStream != NULL) {
mEnv->DeleteGlobalRef(mStream);
mStream = NULL;
}
if (mByteArray != NULL) {
if (mBytes != NULL) {
mEnv->ReleaseByteArrayElements(mByteArray, mBytes, JNI_ABORT);
mBytes = NULL;
}
mEnv->DeleteGlobalRef(mByteArray);
mByteArray = NULL;
} else {
mBytes = NULL;
}
mByteArrayLen = 0;
mEnv = NULL;
}
}
int32_t StreamWrapper::getBufferSize() {
return mByteArrayLen;
}
jbyte* StreamWrapper::getBufferPtr() {
return mBytes;
}
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