mdw@git.distorted.org.uk Git - termux-packages/blob - ndk_patches/JNIHelp.h

   1 /*
   2  * Copyright (C) 2007 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 /*
  18  * JNI helper functions.
  19  *
  20  * This file may be included by C or C++ code, which is trouble because jni.h
  21  * uses different typedefs for JNIEnv in each language.
  22  */
  23 #ifndef _NATIVEHELPER_JNIHELP_H
  24 #define _NATIVEHELPER_JNIHELP_H
  25
  26 #include "jni.h"
  27 #include "utils/Log.h"
  28
  29 #ifndef NELEM
  30 # define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
  31 #endif
  32
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 /*
  38  * Register one or more native methods with a particular class.
  39  */
  40 int jniRegisterNativeMethods(C_JNIEnv* env, const char* className,
  41     const JNINativeMethod* gMethods, int numMethods);
  42
  43 /*
  44  * Throw an exception with the specified class and an optional message.
  45  * The "className" argument will be passed directly to FindClass, which
  46  * takes strings with slashes (e.g. "java/lang/Object").
  47  *
  48  * Returns 0 on success, nonzero if something failed (e.g. the exception
  49  * class couldn't be found).
  50  *
  51  * Currently aborts the VM if it can't throw the exception.
  52  */
  53 int jniThrowException(C_JNIEnv* env, const char* className, const char* msg);
  54
  55 /*
  56  * Throw a java.lang.RuntimeException, with an optional message.
  57  */
  58 int jniThrowRuntimeException(JNIEnv* env, const char* msg);
  59
  60 /*
  61  * Throw a java.io.IOException, generating the message from errno.
  62  */
  63 int jniThrowIOException(C_JNIEnv* env, int errnum);
  64
  65 /*
  66  * Create a java.io.FileDescriptor given an integer fd
  67  */
  68 jobject jniCreateFileDescriptor(C_JNIEnv* env, int fd);
  69
  70 /*
  71  * Get an int file descriptor from a java.io.FileDescriptor
  72  */
  73 int jniGetFDFromFileDescriptor(C_JNIEnv* env, jobject fileDescriptor);
  74
  75 /*
  76  * Set an int file descriptor to a java.io.FileDescriptor
  77  */
  78 void jniSetFileDescriptorOfFD(C_JNIEnv* env, jobject fileDescriptor, int value);
  79
  80 #ifdef __cplusplus
  81 }
  82 #endif
  83
  84
  85 /*
  86  * For C++ code, we provide inlines that map to the C functions.  g++ always
  87  * inlines these, even on non-optimized builds.
  88  */
  89 #if defined(__cplusplus) && !defined(JNI_FORCE_C)
  90 inline int jniRegisterNativeMethods(JNIEnv* env, const char* className,
  91     const JNINativeMethod* gMethods, int numMethods)
  92 {
  93     return jniRegisterNativeMethods(&env->functions, className, gMethods,
  94         numMethods);
  95 }
  96 inline int jniThrowException(JNIEnv* env, const char* className,
  97     const char* msg)
  98 {
  99     return jniThrowException(&env->functions, className, msg);
 100 }
 101 inline int jniThrowIOException(JNIEnv* env, int errnum)
 102 {
 103     return jniThrowIOException(&env->functions, errnum);
 104 }
 105 inline jobject jniCreateFileDescriptor(JNIEnv* env, int fd)
 106 {
 107     return jniCreateFileDescriptor(&env->functions, fd);
 108 }
 109 inline int jniGetFDFromFileDescriptor(JNIEnv* env, jobject fileDescriptor)
 110 {
 111     return jniGetFDFromFileDescriptor(&env->functions, fileDescriptor);
 112 }
 113 inline void jniSetFileDescriptorOfFD(JNIEnv* env, jobject fileDescriptor,
 114     int value)
 115 {
 116     return jniSetFileDescriptorOfFD(&env->functions, fileDescriptor, value);
 117 }
 118 #endif
 119
 120 #endif /*_NATIVEHELPER_JNIHELP_H*/