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/*
* 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.
*/
#ifndef _NATIVEHELPER_JNIHELP_H
#define _NATIVEHELPER_JNIHELP_H
#include "jni.h"
#include "utils/Log.h"
#ifndef NELEM
# define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*
* Register one or more native methods with a particular class.
*/
int jniRegisterNativeMethods(C_JNIEnv* env, const char* className,
const JNINativeMethod* gMethods, int numMethods);
/*
* Throw an exception with the specified class and an optional message.
* The "className" argument will be passed directly to FindClass, which
* takes strings with slashes (e.g. "java/lang/Object").
*
* Returns 0 on success, nonzero if something failed (e.g. the exception
* class couldn't be found).
*
* Currently aborts the VM if it can't throw the exception.
*/
int jniThrowException(C_JNIEnv* env, const char* className, const char* msg);
/*
* Throw a java.lang.RuntimeException, with an optional message.
*/
int jniThrowRuntimeException(JNIEnv* env, const char* msg);
/*
* Throw a java.io.IOException, generating the message from errno.
*/
int jniThrowIOException(C_JNIEnv* env, int errnum);
/*
* Create a java.io.FileDescriptor given an integer fd
*/
jobject jniCreateFileDescriptor(C_JNIEnv* env, int fd);
/*
* Get an int file descriptor from a java.io.FileDescriptor
*/
int jniGetFDFromFileDescriptor(C_JNIEnv* env, jobject fileDescriptor);
/*
* Set an int file descriptor to a java.io.FileDescriptor
*/
void jniSetFileDescriptorOfFD(C_JNIEnv* env, jobject fileDescriptor, int value);
#ifdef __cplusplus
}
#endif
/*
* For C++ code, we provide inlines that map to the C functions. g++ always
* inlines these, even on non-optimized builds.
*/
#if defined(__cplusplus) && !defined(JNI_FORCE_C)
inline int jniRegisterNativeMethods(JNIEnv* env, const char* className,
const JNINativeMethod* gMethods, int numMethods)
{
return jniRegisterNativeMethods(&env->functions, className, gMethods,
numMethods);
}
inline int jniThrowException(JNIEnv* env, const char* className,
const char* msg)
{
return jniThrowException(&env->functions, className, msg);
}
inline int jniThrowIOException(JNIEnv* env, int errnum)
{
return jniThrowIOException(&env->functions, errnum);
}
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)
{
return jniSetFileDescriptorOfFD(&env->functions, fileDescriptor, value);
}
#endif
#endif /*_NATIVEHELPER_JNIHELP_H*/