115 lines
3.8 KiB
C++
115 lines
3.8 KiB
C++
/*
|
|
* 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"
|
|
|
|
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 (void *) (jint) 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);
|
|
}
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
static jclass findClass(JNIEnv* env, const char name[]) {
|
|
jclass c = env->FindClass(name);
|
|
LOG_FATAL_IF(!c, "Unable to find class %s", name);
|
|
return c;
|
|
}
|
|
|
|
static jmethodID findStaticMethod(JNIEnv* env, jclass c, const char method[],
|
|
const char params[]) {
|
|
jmethodID m = env->GetStaticMethodID(c, method, params);
|
|
LOG_FATAL_IF(!m, "Unable to find method %s", method);
|
|
return m;
|
|
}
|
|
|
|
static jfieldID getFieldID(JNIEnv* env, jclass c, const char name[],
|
|
const char type[]) {
|
|
jfieldID f = env->GetFieldID(c, name, type);
|
|
LOG_FATAL_IF(!f, "Unable to find field %s", name);
|
|
return f;
|
|
}
|
|
|
|
namespace android {
|
|
|
|
int register_android_nio_utils(JNIEnv* env);
|
|
int register_android_nio_utils(JNIEnv* env) {
|
|
jclass localClass = findClass(env, "java/nio/NIOAccess");
|
|
gNioJNI.getBasePointerID = findStaticMethod(env, localClass,
|
|
"getBasePointer", "(Ljava/nio/Buffer;)J");
|
|
gNioJNI.getBaseArrayID = findStaticMethod(env, localClass,
|
|
"getBaseArray", "(Ljava/nio/Buffer;)Ljava/lang/Object;");
|
|
gNioJNI.getBaseArrayOffsetID = findStaticMethod(env, localClass,
|
|
"getBaseArrayOffset", "(Ljava/nio/Buffer;)I");
|
|
|
|
// now record a permanent version of the class ID
|
|
gNioJNI.nioAccessClass = (jclass) env->NewGlobalRef(localClass);
|
|
|
|
return 0;
|
|
}
|
|
|
|
}
|