19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#ifndef android_nio_utils_DEFINED 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#define android_nio_utils_DEFINED 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <android_runtime/AndroidRuntime.h> 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectnamespace android { 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Given an nio.Buffer, return a pointer to it, beginning at its current 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * position. The returned pointer is only valid for the current JNI stack-frame. 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * For performance, it does not create any global references, so the getPointer 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (and releasePointer if array is returned non-null) must be done in the 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * same JNI stack-frame. 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param env The current JNI env 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param buffer The nio.Buffer object 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param array REQUIRED. Output. If on return it is set to non-null, then 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * nio_releasePointer must be called with the array 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * and the returned pointer when the caller is through with it. 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If on return it is set to null, do not call 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * nio_releasePointer. 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The pointer to the memory in the buffer object 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectvoid* nio_getPointer(JNIEnv *env, jobject buffer, jarray *array); 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Call this if android_nio_getPointer returned non-null in its array parameter. 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Pass that array and the returned pointer when you are done accessing the 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pointer. If called (i.e. array is non-null), it must be called in the same 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * JNI stack-frame as getPointer 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param env The current JNI env 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param buffer The array returned from android_nio_getPointer (!= null) 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param pointer The pointer returned by android_nio_getPointer 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param commit JNI_FALSE if the pointer was just read, and JNI_TRUE if 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the pointer was written to. 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectvoid nio_releasePointer(JNIEnv *env, jarray array, void *pointer, 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jboolean commit); 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectclass AutoBufferPointer { 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic: 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project AutoBufferPointer(JNIEnv* env, jobject nioBuffer, jboolean commit); 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ~AutoBufferPointer(); 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project void* pointer() const { return fPointer; } 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectprivate: 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project JNIEnv* fEnv; 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project void* fPointer; 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jarray fArray; 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jint fRemaining; 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jboolean fCommit; 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project}; 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} /* namespace android */ 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#endif 75