1 /*
2 * Copyright (C) 2006 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 "include_platform/nativehelper/JNIPlatformHelp.h"
18
19 #include <stddef.h>
20
21 #include "JniConstants.h"
22
GetBufferPosition(JNIEnv * env,jobject nioBuffer)23 static int GetBufferPosition(JNIEnv* env, jobject nioBuffer) {
24 return(*env)->GetIntField(env, nioBuffer, JniConstants_NioBuffer_position(env));
25 }
26
GetBufferLimit(JNIEnv * env,jobject nioBuffer)27 static int GetBufferLimit(JNIEnv* env, jobject nioBuffer) {
28 return(*env)->GetIntField(env, nioBuffer, JniConstants_NioBuffer_limit(env));
29 }
30
GetBufferElementSizeShift(JNIEnv * env,jobject nioBuffer)31 static int GetBufferElementSizeShift(JNIEnv* env, jobject nioBuffer) {
32 return(*env)->GetIntField(env, nioBuffer, JniConstants_NioBuffer__elementSizeShift(env));
33 }
34
jniGetNioBufferBaseArray(JNIEnv * env,jobject nioBuffer)35 jarray jniGetNioBufferBaseArray(JNIEnv* env, jobject nioBuffer) {
36 jclass nioAccessClass = JniConstants_NIOAccessClass(env);
37 jmethodID getBaseArrayMethod = JniConstants_NIOAccess_getBaseArray(env);
38 jobject object = (*env)->CallStaticObjectMethod(env,
39 nioAccessClass, getBaseArrayMethod, nioBuffer);
40 return (jarray) object;
41 }
42
jniGetNioBufferBaseArrayOffset(JNIEnv * env,jobject nioBuffer)43 int jniGetNioBufferBaseArrayOffset(JNIEnv* env, jobject nioBuffer) {
44 jclass nioAccessClass = JniConstants_NIOAccessClass(env);
45 jmethodID getBaseArrayOffsetMethod = JniConstants_NIOAccess_getBaseArrayOffset(env);
46 return (*env)->CallStaticIntMethod(env, nioAccessClass, getBaseArrayOffsetMethod, nioBuffer);
47 }
48
jniGetNioBufferPointer(JNIEnv * env,jobject nioBuffer)49 jlong jniGetNioBufferPointer(JNIEnv* env, jobject nioBuffer) {
50 jlong baseAddress = (*env)->GetLongField(env, nioBuffer, JniConstants_NioBuffer_address(env));
51 if (baseAddress != 0) {
52 const int position = GetBufferPosition(env, nioBuffer);
53 const int shift = GetBufferElementSizeShift(env, nioBuffer);
54 baseAddress += position << shift;
55 }
56 return baseAddress;
57 }
58
jniGetNioBufferFields(JNIEnv * env,jobject nioBuffer,jint * position,jint * limit,jint * elementSizeShift)59 jlong jniGetNioBufferFields(JNIEnv* env, jobject nioBuffer,
60 jint* position, jint* limit, jint* elementSizeShift) {
61 *position = GetBufferPosition(env, nioBuffer);
62 *limit = GetBufferLimit(env, nioBuffer);
63 *elementSizeShift = GetBufferElementSizeShift(env, nioBuffer);
64 return (*env)->GetLongField(env, nioBuffer, JniConstants_NioBuffer_address(env));
65 }
66