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      1 /*
      2  * Copyright 2009, The Android Open Source Project
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *  * Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  *  * Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "MyJavaVM.h"
     28 
     29 #include <JNIUtility.h>
     30 #include <jni.h>
     31 
     32 static JNIEnv* s_env;
     33 static JavaVM* s_jvm;
     34 
     35 // JavaVM functions
     36 jint vm_attachCurrentThread(JavaVM*, JNIEnv** env, void*) {
     37     *env = s_env;
     38     return JNI_OK;
     39 }
     40 
     41 // JNIEnv functions
     42 jobject env_callObjectMethodV(JNIEnv*, jobject, jmethodID, va_list) {
     43     return MY_JOBJECT;
     44 }
     45 void env_callVoidMethodV(JNIEnv*, jobject, jmethodID, va_list) {}
     46 void env_deleteRef(JNIEnv*, jobject) {}
     47 jboolean env_exceptionCheck(JNIEnv*) {
     48     return false;
     49 }
     50 jclass env_findClass(JNIEnv*, const char*) {
     51     return (jclass) 1;
     52 }
     53 jbyte* env_getByteArrayElements(JNIEnv*, jbyteArray, jboolean*) {
     54     return NULL;
     55 }
     56 jmethodID env_getMethodID(JNIEnv*, jclass, const char*, const char*) {
     57     return (jmethodID) 1;
     58 }
     59 jclass env_getObjectClass(JNIEnv*, jobject) {
     60     return (jclass) 1;
     61 }
     62 static const char* s_fakeString = "Fake Java String";
     63 const jchar* env_getStringChars(JNIEnv*, jstring, jboolean* isCopy) {
     64     if (isCopy)
     65         *isCopy = false;
     66     return (const jchar*)s_fakeString;
     67 }
     68 jsize env_getStringLength(JNIEnv*, jstring) {
     69     return sizeof(s_fakeString) - 1;
     70 }
     71 jbyteArray env_newByteArray(JNIEnv*, jsize) {
     72     return (jbyteArray) 1;
     73 }
     74 jobject env_newRef(JNIEnv*, jobject obj) {
     75     return obj;
     76 }
     77 jobject env_newObjectV(JNIEnv*, jclass, jmethodID, va_list) {
     78     return MY_JOBJECT;
     79 }
     80 jstring env_newString(JNIEnv*, const jchar*, jsize) {
     81     return (jstring) 1;
     82 }
     83 void env_releaseByteArrayElements(JNIEnv*, jbyteArray, jbyte*, jint) {}
     84 void env_releaseStringChars(JNIEnv*, jstring, const jchar*) {}
     85 void env_setByteArrayRegion(JNIEnv*, jbyteArray, jsize, jsize, const jbyte*) {}
     86 void env_setIntField(JNIEnv*, jobject, jfieldID, jint) {}
     87 
     88 void InitializeJavaVM() {
     89     // First, create the fake vm
     90     s_jvm = new JavaVM;
     91     JNIInvokeInterface* i = new JNIInvokeInterface;
     92     memset(i, 0, sizeof(JNIInvokeInterface));
     93     s_jvm->functions = i;
     94 
     95     // Now, assign the functions of the vm to our fake ones.
     96     i->AttachCurrentThread      = vm_attachCurrentThread;
     97 
     98     // Create the fake env next
     99     s_env = new JNIEnv;
    100     JNINativeInterface* n = new JNINativeInterface;
    101     memset(n, 0, sizeof(JNINativeInterface));
    102     s_env->functions = n;
    103 
    104     // Point the functions we care about to out fake ones.
    105     n->CallObjectMethodV        = env_callObjectMethodV;
    106     n->CallVoidMethodV          = env_callVoidMethodV;
    107     n->DeleteLocalRef           = env_deleteRef;
    108     n->DeleteGlobalRef          = env_deleteRef;
    109     n->DeleteWeakGlobalRef      = env_deleteRef;
    110     n->ExceptionCheck           = env_exceptionCheck;
    111     n->FindClass                = env_findClass;
    112     n->GetByteArrayElements     = env_getByteArrayElements;
    113     n->GetMethodID              = env_getMethodID;
    114     n->GetObjectClass           = env_getObjectClass;
    115     n->GetStringChars           = env_getStringChars;
    116     n->GetStringLength          = env_getStringLength;
    117     n->NewByteArray             = env_newByteArray;
    118     n->NewLocalRef              = env_newRef;
    119     n->NewGlobalRef             = env_newRef;
    120     n->NewWeakGlobalRef         = env_newRef;
    121     n->NewObjectV               = env_newObjectV;
    122     n->NewString                = env_newString;
    123     n->ReleaseByteArrayElements = env_releaseByteArrayElements;
    124     n->ReleaseStringChars       = env_releaseStringChars;
    125     n->SetByteArrayRegion       = env_setByteArrayRegion;
    126     n->SetIntField              = env_setIntField;
    127 
    128     // Tell WebCore about the vm
    129     JSC::Bindings::setJavaVM(s_jvm);
    130 }
    131