| /* |
| * Copyright (C) 2007 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. |
| */ |
| |
| /* |
| * JNI helper functions. |
| * |
| * This file may be included by C or C++ code, which is trouble because jni.h |
| * uses different typedefs for JNIEnv in each language. |
| */ |
| #pragma once |
| |
| #include <sys/cdefs.h> |
| |
| #include <jni.h> |
| |
| #include <nativehelper/JNIHelp.h> |
| |
| __BEGIN_DECLS |
| |
| /* |
| * Returns a new java.io.FileDescriptor for the given int fd. |
| */ |
| jobject jniCreateFileDescriptor(C_JNIEnv* env, int fd); |
| |
| /* |
| * Returns the int fd from a java.io.FileDescriptor. |
| */ |
| int jniGetFDFromFileDescriptor(C_JNIEnv* env, jobject fileDescriptor); |
| |
| /* |
| * Sets the int fd in a java.io.FileDescriptor. Throws java.lang.NullPointerException |
| * if fileDescriptor is null. |
| */ |
| void jniSetFileDescriptorOfFD(C_JNIEnv* env, jobject fileDescriptor, int value); |
| |
| /* |
| * Gets the managed heap array backing a java.nio.Buffer instance. |
| * |
| * Returns nullptr if there is no array backing. |
| * |
| * This method performs a JNI call to java.nio.NIOAccess.getBaseArray(). |
| */ |
| jarray jniGetNioBufferBaseArray(C_JNIEnv* env, jobject nioBuffer); |
| |
| /* |
| * Gets the offset of the current buffer position in bytes from the start of the managed heap |
| * array backing the buffer. |
| * |
| * Returns 0 if there is no array backing. |
| * |
| * This method performs a JNI call to java.nio.NIOAccess.getBaseArrayOffset(). |
| */ |
| jint jniGetNioBufferBaseArrayOffset(C_JNIEnv* env, jobject nioBuffer); |
| |
| /* |
| * Gets field information from a java.nio.Buffer instance. |
| * |
| * Reads the |position|, |limit|, and |elementSizeShift| fields from the buffer instance. |
| * |
| * Returns the |address| field of the java.nio.Buffer instance which is only valid (non-zero) when |
| * the buffer is backed by a direct buffer. |
| */ |
| jlong jniGetNioBufferFields(C_JNIEnv* env, |
| jobject nioBuffer, |
| /*out*/jint* position, |
| /*out*/jint* limit, |
| /*out*/jint* elementSizeShift); |
| |
| /* |
| * Gets the current position from a java.nio.Buffer as a pointer to memory in a fixed buffer. |
| * |
| * Returns 0 if |nioBuffer| is not backed by a direct buffer. |
| * |
| * This method reads the |address|, |position|, and |elementSizeShift| fields from the |
| * java.nio.Buffer instance to calculate the pointer address for the current position. |
| */ |
| jlong jniGetNioBufferPointer(C_JNIEnv* env, jobject nioBuffer); |
| |
| /* |
| * Clear the cache of constants libnativehelper is using. |
| */ |
| void jniUninitializeConstants(); |
| |
| __END_DECLS |
| |
| /* |
| * For C++ code, we provide inlines that map to the C functions. g++ always |
| * inlines these, even on non-optimized builds. |
| */ |
| #if defined(__cplusplus) |
| |
| inline jobject jniCreateFileDescriptor(JNIEnv* env, int fd) { |
| return jniCreateFileDescriptor(&env->functions, fd); |
| } |
| |
| inline int jniGetFDFromFileDescriptor(JNIEnv* env, jobject fileDescriptor) { |
| return jniGetFDFromFileDescriptor(&env->functions, fileDescriptor); |
| } |
| |
| inline void jniSetFileDescriptorOfFD(JNIEnv* env, jobject fileDescriptor, int value) { |
| jniSetFileDescriptorOfFD(&env->functions, fileDescriptor, value); |
| } |
| |
| inline jarray jniGetNioBufferBaseArray(JNIEnv* env, jobject nioBuffer) { |
| return jniGetNioBufferBaseArray(&env->functions, nioBuffer); |
| } |
| |
| inline jint jniGetNioBufferBaseArrayOffset(JNIEnv* env, jobject nioBuffer) { |
| return jniGetNioBufferBaseArrayOffset(&env->functions, nioBuffer); |
| } |
| |
| inline jlong jniGetNioBufferFields(JNIEnv* env, jobject nioBuffer, |
| jint* position, jint* limit, jint* elementSizeShift) { |
| return jniGetNioBufferFields(&env->functions, nioBuffer, |
| position, limit, elementSizeShift); |
| } |
| |
| inline jlong jniGetNioBufferPointer(JNIEnv* env, jobject nioBuffer) { |
| return jniGetNioBufferPointer(&env->functions, nioBuffer); |
| } |
| |
| #endif // defined(__cplusplus) |