/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "android_os_NativeHandle.h"
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#include <nativehelper/JNIHelp.h>
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#include <nativehelper/ScopedLocalRef.h>
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#include "core_jni_helpers.h"
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#define PACKAGE_PATH "android/os"
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#define CLASS_NAME "NativeHandle"
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#define CLASS_PATH PACKAGE_PATH "/" CLASS_NAME
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namespace android {
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static struct {
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jclass clazz;
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jmethodID constructID; // NativeHandle(int[] fds, int[] ints, boolean owns)
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jmethodID getFdsID; // int[] NativeHandle.getFds()
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jmethodID getIntsID; // int[] NativeHandle.getInts()
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} gNativeHandleFields;
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jobject JNativeHandle::MakeJavaNativeHandleObj(
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JNIEnv *env, const native_handle_t *handle) {
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if (handle == nullptr) { return nullptr; }
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const int numFds = handle->numFds;
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ScopedLocalRef<jintArray> fds(env, env->NewIntArray(numFds));
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env->SetIntArrayRegion(fds.get(), 0, numFds, &(handle->data[0]));
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const int numInts = handle->numInts;
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ScopedLocalRef<jintArray> ints(env, env->NewIntArray(numInts));
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env->SetIntArrayRegion(ints.get(), 0, numInts, &(handle->data[numFds]));
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return env->NewObject(gNativeHandleFields.clazz,
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gNativeHandleFields.constructID, fds.get(), ints.get(), false /*own*/);
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}
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native_handle_t *JNativeHandle::MakeCppNativeHandle(
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JNIEnv *env, jobject jHandle, EphemeralStorage *storage) {
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if (jHandle == nullptr) { return nullptr; }
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if (!env->IsInstanceOf(jHandle, gNativeHandleFields.clazz)) {
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jniThrowException(env, "java/lang/ClassCastException",
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"jHandle must be an instance of NativeHandle.");
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return nullptr;
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}
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ScopedLocalRef<jintArray> fds(env, (jintArray) env->CallObjectMethod(
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jHandle, gNativeHandleFields.getFdsID));
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ScopedLocalRef<jintArray> ints(env, (jintArray) env->CallObjectMethod(
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jHandle, gNativeHandleFields.getIntsID));
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const int numFds = (int) env->GetArrayLength(fds.get());
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const int numInts = (int) env->GetArrayLength(ints.get());
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native_handle_t *handle = (storage == nullptr)
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? native_handle_create(numFds, numInts)
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: storage->allocTemporaryNativeHandle(numFds, numInts);
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if (handle != nullptr) {
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env->GetIntArrayRegion(fds.get(), 0, numFds, &(handle->data[0]));
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env->GetIntArrayRegion(ints.get(), 0, numInts, &(handle->data[numFds]));
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} else {
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jniThrowException(env, "java/lang/OutOfMemoryError",
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"Failed to allocate memory for native_handle_t.");
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}
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return handle;
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}
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jobjectArray JNativeHandle::AllocJavaNativeHandleObjArray(JNIEnv *env, jsize length) {
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return env->NewObjectArray(length, gNativeHandleFields.clazz, nullptr);
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}
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int register_android_os_NativeHandle(JNIEnv *env) {
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jclass clazz = FindClassOrDie(env, CLASS_PATH);
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gNativeHandleFields.clazz = MakeGlobalRefOrDie(env, clazz);
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gNativeHandleFields.constructID = GetMethodIDOrDie(env, clazz, "<init>", "([I[IZ)V");
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gNativeHandleFields.getFdsID = GetMethodIDOrDie(env, clazz, "getFdsAsIntArray", "()[I");
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gNativeHandleFields.getIntsID = GetMethodIDOrDie(env, clazz, "getInts", "()[I");
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return 0;
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}
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}
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