1 /* 2 * Copyright (c) Facebook, Inc. and its affiliates. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <fbjni/fbjni.h> 20 21 namespace facebook { 22 namespace jni { 23 24 class JBuffer : public JavaClass<JBuffer> { 25 public: 26 static constexpr const char* kJavaDescriptor = "Ljava/nio/Buffer;"; 27 28 void rewind() const; 29 bool isDirect() const; 30 void* getDirectAddress() const; 31 size_t getDirectCapacity() const; 32 }; 33 34 class JByteOrder : public JavaClass<JByteOrder> { 35 public: 36 constexpr static const char* kJavaDescriptor = "Ljava/nio/ByteOrder;"; 37 38 static local_ref<JByteOrder> nativeOrder(); 39 static local_ref<JByteOrder> bigEndian(); 40 static local_ref<JByteOrder> littleEndian(); 41 }; 42 43 // JNI's NIO support has some awkward preconditions and error reporting. This 44 // class provides much more user-friendly access. 45 class JByteBuffer : public JavaClass<JByteBuffer, JBuffer> { 46 public: 47 static constexpr const char* kJavaDescriptor = "Ljava/nio/ByteBuffer;"; 48 49 static local_ref<JByteBuffer> wrapBytes(uint8_t* data, size_t size); 50 static local_ref<JByteBuffer> allocateDirect(jint size); 51 52 local_ref<JByteBuffer> order(alias_ref<JByteOrder>); 53 getDirectBytes()54 uint8_t* getDirectBytes() const { 55 return static_cast<uint8_t*>(getDirectAddress()); 56 } 57 getDirectSize()58 size_t getDirectSize() const { 59 return getDirectCapacity(); 60 } 61 }; 62 63 } // namespace jni 64 } // namespace facebook 65