102 lines
3.9 KiB
C
102 lines
3.9 KiB
C
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "jni.h"
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//Method to verify expression and throw java/lang/Exception if it is FALSE
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void Assert(JNIEnv *jni_env, jint expr, const char* message) {
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if(expr == 0){ //if expr is false
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(*jni_env)->FatalError(jni_env, message);
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}
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}
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//Method to allocate a java/lang/String object and return jstring as a result
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jstring AllocateString(JNIEnv *jni_env) {
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jclass classString = NULL;
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jstring allocatedString = NULL;
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classString = (*jni_env)->FindClass(jni_env, "java/lang/String");
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//NULL check
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Assert(jni_env, (classString != NULL), "class String not found");
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//allocate object of type java/lang/String
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allocatedString = (jstring) (*jni_env)->AllocObject(jni_env, classString);
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//NULL check
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Assert(jni_env, (allocatedString != NULL), "allocated string is NULL");
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return allocatedString;
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}
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//GetStringLength test
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JNIEXPORT void JNICALL Java_UninitializedStrings_lengthTest
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(JNIEnv *jni_env, jclass cl) {
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jint stringLength = 0;
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jstring allocatedString = NULL;
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//allocate object of type java/lang/String
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allocatedString = AllocateString(jni_env);
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stringLength = (*jni_env)->GetStringLength(jni_env, allocatedString);
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Assert(jni_env, (stringLength == 0), "string length must be 0");
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}
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//GetStringChars test
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JNIEXPORT void JNICALL Java_UninitializedStrings_charsTest
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(JNIEnv *jni_env, jclass cl) {
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jint compareRes = 0;
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const jchar* stringChars = NULL;
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jstring allocatedString = NULL;
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//allocate object of type java/lang/String
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allocatedString = AllocateString(jni_env);
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stringChars = (*jni_env)->GetStringChars(jni_env, allocatedString, NULL);
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compareRes = (stringChars == NULL);
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//release stringChars pointer
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(*jni_env)->ReleaseStringChars(jni_env, allocatedString, stringChars);
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Assert(jni_env, compareRes, "string chars must be NULL");
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}
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//GetStringUTFLength test
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JNIEXPORT void JNICALL Java_UninitializedStrings_utfLengthTest
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(JNIEnv *jni_env, jclass cl) {
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jint stringLength = 0;
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jstring allocatedString = NULL;
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//allocate object of type java/lang/String
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allocatedString = AllocateString(jni_env);
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stringLength = (*jni_env)->GetStringUTFLength(jni_env, allocatedString);
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Assert(jni_env, (stringLength == 0), "string utf length must be 0");
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}
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//GetStringUTFChars test
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JNIEXPORT void JNICALL Java_UninitializedStrings_utfCharsTest
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(JNIEnv *jni_env, jclass cl) {
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jint compareRes = 0;
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const char* stringUtfChars = NULL;
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jstring allocatedString = NULL;
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//allocate object of type java/lang/String
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allocatedString = AllocateString(jni_env);
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stringUtfChars = (*jni_env)->GetStringUTFChars(jni_env, allocatedString, NULL);
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compareRes = (stringUtfChars == NULL);
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//release stringUtfChars pointer
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(*jni_env)->ReleaseStringUTFChars(jni_env, allocatedString, stringUtfChars);
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Assert(jni_env, compareRes, "string utf chars must be NULL");
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}
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