The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 The Android Open Source Project |
| 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 | #include "android_nio_utils.h" |
| 18 | |
Andreas Gampe | 987f79f | 2014-11-18 17:29:46 -0800 | [diff] [blame] | 19 | #include "core_jni_helpers.h" |
| 20 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 21 | struct NioJNIData { |
| 22 | jclass nioAccessClass; |
| 23 | |
| 24 | jmethodID getBasePointerID; |
| 25 | jmethodID getBaseArrayID; |
| 26 | jmethodID getBaseArrayOffsetID; |
| 27 | }; |
| 28 | |
| 29 | static NioJNIData gNioJNI; |
| 30 | |
| 31 | void* android::nio_getPointer(JNIEnv *_env, jobject buffer, jarray *array) { |
| 32 | assert(array); |
| 33 | |
| 34 | jlong pointer; |
| 35 | jint offset; |
| 36 | void *data; |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 37 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 38 | pointer = _env->CallStaticLongMethod(gNioJNI.nioAccessClass, |
| 39 | gNioJNI.getBasePointerID, buffer); |
| 40 | if (pointer != 0L) { |
| 41 | *array = NULL; |
Ashok Bhat | f5df700 | 2014-03-25 20:51:35 +0000 | [diff] [blame] | 42 | return reinterpret_cast<void *>(pointer); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 43 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 44 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 45 | *array = (jarray) _env->CallStaticObjectMethod(gNioJNI.nioAccessClass, |
| 46 | gNioJNI.getBaseArrayID, buffer); |
| 47 | offset = _env->CallStaticIntMethod(gNioJNI.nioAccessClass, |
| 48 | gNioJNI.getBaseArrayOffsetID, buffer); |
| 49 | data = _env->GetPrimitiveArrayCritical(*array, (jboolean *) 0); |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 50 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 51 | return (void *) ((char *) data + offset); |
| 52 | } |
| 53 | |
| 54 | |
| 55 | void android::nio_releasePointer(JNIEnv *_env, jarray array, void *data, |
| 56 | jboolean commit) { |
| 57 | _env->ReleasePrimitiveArrayCritical(array, data, |
| 58 | commit ? 0 : JNI_ABORT); |
| 59 | } |
| 60 | |
| 61 | /////////////////////////////////////////////////////////////////////////////// |
| 62 | |
| 63 | android::AutoBufferPointer::AutoBufferPointer(JNIEnv* env, jobject nioBuffer, |
| 64 | jboolean commit) { |
| 65 | fEnv = env; |
| 66 | fCommit = commit; |
| 67 | fPointer = android::nio_getPointer(env, nioBuffer, &fArray); |
| 68 | } |
| 69 | |
| 70 | android::AutoBufferPointer::~AutoBufferPointer() { |
| 71 | if (NULL != fArray) { |
| 72 | android::nio_releasePointer(fEnv, fArray, fPointer, fCommit); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | /////////////////////////////////////////////////////////////////////////////// |
| 77 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 78 | namespace android { |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 79 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 80 | int register_android_nio_utils(JNIEnv* env) { |
Andreas Gampe | 987f79f | 2014-11-18 17:29:46 -0800 | [diff] [blame] | 81 | jclass localClass = FindClassOrDie(env, "java/nio/NIOAccess"); |
| 82 | gNioJNI.getBasePointerID = GetStaticMethodIDOrDie(env, localClass, "getBasePointer", |
| 83 | "(Ljava/nio/Buffer;)J"); |
| 84 | gNioJNI.getBaseArrayID = GetStaticMethodIDOrDie(env, localClass, "getBaseArray", |
| 85 | "(Ljava/nio/Buffer;)Ljava/lang/Object;"); |
| 86 | gNioJNI.getBaseArrayOffsetID = GetStaticMethodIDOrDie(env, localClass, "getBaseArrayOffset", |
| 87 | "(Ljava/nio/Buffer;)I"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 88 | |
| 89 | // now record a permanent version of the class ID |
Andreas Gampe | 987f79f | 2014-11-18 17:29:46 -0800 | [diff] [blame] | 90 | gNioJNI.nioAccessClass = MakeGlobalRefOrDie(env, localClass); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | } |