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/*
* Copyright (C) 2008 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 "android_nio_utils.h"
#include "core_jni_helpers.h"
struct NioJNIData {
jclass nioAccessClass;
jmethodID getBasePointerID;
jmethodID getBaseArrayID;
jmethodID getBaseArrayOffsetID;
};
static NioJNIData gNioJNI;
void* android::nio_getPointer(JNIEnv *_env, jobject buffer, jarray *array) {
assert(array);
jlong pointer;
jint offset;
void *data;
pointer = _env->CallStaticLongMethod(gNioJNI.nioAccessClass,
gNioJNI.getBasePointerID, buffer);
if (pointer != 0L) {
*array = NULL;
return reinterpret_cast<void *>(pointer);
}
*array = (jarray) _env->CallStaticObjectMethod(gNioJNI.nioAccessClass,
gNioJNI.getBaseArrayID, buffer);
offset = _env->CallStaticIntMethod(gNioJNI.nioAccessClass,
gNioJNI.getBaseArrayOffsetID, buffer);
data = _env->GetPrimitiveArrayCritical(*array, (jboolean *) 0);
return (void *) ((char *) data + offset);
}
void android::nio_releasePointer(JNIEnv *_env, jarray array, void *data,
jboolean commit) {
_env->ReleasePrimitiveArrayCritical(array, data,
commit ? 0 : JNI_ABORT);
}
///////////////////////////////////////////////////////////////////////////////
android::AutoBufferPointer::AutoBufferPointer(JNIEnv* env, jobject nioBuffer,
jboolean commit) {
fEnv = env;
fCommit = commit;
fPointer = android::nio_getPointer(env, nioBuffer, &fArray);
}
android::AutoBufferPointer::~AutoBufferPointer() {
if (NULL != fArray) {
android::nio_releasePointer(fEnv, fArray, fPointer, fCommit);
}
}
///////////////////////////////////////////////////////////////////////////////
namespace android {
int register_android_nio_utils(JNIEnv* env) {
jclass localClass = FindClassOrDie(env, "java/nio/NIOAccess");
gNioJNI.getBasePointerID = GetStaticMethodIDOrDie(env, localClass, "getBasePointer",
"(Ljava/nio/Buffer;)J");
gNioJNI.getBaseArrayID = GetStaticMethodIDOrDie(env, localClass, "getBaseArray",
"(Ljava/nio/Buffer;)Ljava/lang/Object;");
gNioJNI.getBaseArrayOffsetID = GetStaticMethodIDOrDie(env, localClass, "getBaseArrayOffset",
"(Ljava/nio/Buffer;)I");
// now record a permanent version of the class ID
gNioJNI.nioAccessClass = MakeGlobalRefOrDie(env, localClass);
return 0;
}
}
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