Java example source code file (jni_util.c)
The jni_util.c Java example source code/*
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <stdlib.h>
#include <string.h>
#include "jvm.h"
#include "jni.h"
#include "jni_util.h"
/* Due to a bug in the win32 C runtime library strings
* such as "z:" need to be appended with a "." so we
* must allocate at least 4 bytes to allow room for
* this expansion. See 4235353 for details.
*/
#define MALLOC_MIN4(len) ((char *)malloc((len) + 1 < 4 ? 4 : (len) + 1))
/**
* Throw a Java exception by name. Similar to SignalError.
*/
JNIEXPORT void JNICALL
JNU_ThrowByName(JNIEnv *env, const char *name, const char *msg)
{
jclass cls = (*env)->FindClass(env, name);
if (cls != 0) /* Otherwise an exception has already been thrown */
(*env)->ThrowNew(env, cls, msg);
}
/* JNU_Throw common exceptions */
JNIEXPORT void JNICALL
JNU_ThrowNullPointerException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/NullPointerException", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowArrayIndexOutOfBoundsException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/ArrayIndexOutOfBoundsException", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowOutOfMemoryError(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/OutOfMemoryError", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowIllegalArgumentException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/IllegalArgumentException", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowIllegalAccessError(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/IllegalAccessError", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowIllegalAccessException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/IllegalAccessException", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowInternalError(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/InternalError", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowNoSuchFieldException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/NoSuchFieldException", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowNoSuchMethodException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/NoSuchMethodException", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowClassNotFoundException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/ClassNotFoundException", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowNumberFormatException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/NumberFormatException", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowIOException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/io/IOException", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowNoSuchFieldError(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/NoSuchFieldError", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowNoSuchMethodError(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/NoSuchMethodError", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowStringIndexOutOfBoundsException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/StringIndexOutOfBoundsException", msg);
}
JNIEXPORT void JNICALL
JNU_ThrowInstantiationException(JNIEnv *env, const char *msg)
{
JNU_ThrowByName(env, "java/lang/InstantiationException", msg);
}
/* Throw an exception by name, using the string returned by
* JVM_LastErrorString for the detail string. If the last-error
* string is NULL, use the given default detail string.
*/
JNIEXPORT void JNICALL
JNU_ThrowByNameWithLastError(JNIEnv *env, const char *name,
const char *defaultDetail)
{
char buf[256];
int n = JVM_GetLastErrorString(buf, sizeof(buf));
if (n > 0) {
jstring s = JNU_NewStringPlatform(env, buf);
if (s != NULL) {
jobject x = JNU_NewObjectByName(env, name,
"(Ljava/lang/String;)V", s);
if (x != NULL) {
(*env)->Throw(env, x);
}
}
}
if (!(*env)->ExceptionOccurred(env)) {
JNU_ThrowByName(env, name, defaultDetail);
}
}
/* Throw an IOException, using the last-error string for the detail
* string. If the last-error string is NULL, use the given default
* detail string.
*/
JNIEXPORT void JNICALL
JNU_ThrowIOExceptionWithLastError(JNIEnv *env, const char *defaultDetail)
{
JNU_ThrowByNameWithLastError(env, "java/io/IOException", defaultDetail);
}
JNIEXPORT jvalue JNICALL
JNU_CallStaticMethodByName(JNIEnv *env,
jboolean *hasException,
const char *class_name,
const char *name,
const char *signature,
...)
{
jclass clazz;
jmethodID mid;
va_list args;
jvalue result;
const char *p = signature;
/* find out the return type */
while (*p && *p != ')')
p++;
p++;
result.i = 0;
if ((*env)->EnsureLocalCapacity(env, 3) < 0)
goto done2;
clazz = (*env)->FindClass(env, class_name);
if (clazz == 0)
goto done2;
mid = (*env)->GetStaticMethodID(env, clazz, name, signature);
if (mid == 0)
goto done1;
va_start(args, signature);
switch (*p) {
case 'V':
(*env)->CallStaticVoidMethodV(env, clazz, mid, args);
break;
case '[':
case 'L':
result.l = (*env)->CallStaticObjectMethodV(env, clazz, mid, args);
break;
case 'Z':
result.z = (*env)->CallStaticBooleanMethodV(env, clazz, mid, args);
break;
case 'B':
result.b = (*env)->CallStaticByteMethodV(env, clazz, mid, args);
break;
case 'C':
result.c = (*env)->CallStaticCharMethodV(env, clazz, mid, args);
break;
case 'S':
result.s = (*env)->CallStaticShortMethodV(env, clazz, mid, args);
break;
case 'I':
result.i = (*env)->CallStaticIntMethodV(env, clazz, mid, args);
break;
case 'J':
result.j = (*env)->CallStaticLongMethodV(env, clazz, mid, args);
break;
case 'F':
result.f = (*env)->CallStaticFloatMethodV(env, clazz, mid, args);
break;
case 'D':
result.d = (*env)->CallStaticDoubleMethodV(env, clazz, mid, args);
break;
default:
(*env)->FatalError(env, "JNU_CallStaticMethodByName: illegal signature");
}
va_end(args);
done1:
(*env)->DeleteLocalRef(env, clazz);
done2:
if (hasException) {
*hasException = (*env)->ExceptionCheck(env);
}
return result;
}
JNIEXPORT jvalue JNICALL
JNU_CallMethodByName(JNIEnv *env,
jboolean *hasException,
jobject obj,
const char *name,
const char *signature,
...)
{
jvalue result;
va_list args;
va_start(args, signature);
result = JNU_CallMethodByNameV(env, hasException, obj, name, signature,
args);
va_end(args);
return result;
}
JNIEXPORT jvalue JNICALL
JNU_CallMethodByNameV(JNIEnv *env,
jboolean *hasException,
jobject obj,
const char *name,
const char *signature,
va_list args)
{
jclass clazz;
jmethodID mid;
jvalue result;
const char *p = signature;
/* find out the return type */
while (*p && *p != ')')
p++;
p++;
result.i = 0;
if ((*env)->EnsureLocalCapacity(env, 3) < 0)
goto done2;
clazz = (*env)->GetObjectClass(env, obj);
mid = (*env)->GetMethodID(env, clazz, name, signature);
if (mid == 0)
goto done1;
switch (*p) {
case 'V':
(*env)->CallVoidMethodV(env, obj, mid, args);
break;
case '[':
case 'L':
result.l = (*env)->CallObjectMethodV(env, obj, mid, args);
break;
case 'Z':
result.z = (*env)->CallBooleanMethodV(env, obj, mid, args);
break;
case 'B':
result.b = (*env)->CallByteMethodV(env, obj, mid, args);
break;
case 'C':
result.c = (*env)->CallCharMethodV(env, obj, mid, args);
break;
case 'S':
result.s = (*env)->CallShortMethodV(env, obj, mid, args);
break;
case 'I':
result.i = (*env)->CallIntMethodV(env, obj, mid, args);
break;
case 'J':
result.j = (*env)->CallLongMethodV(env, obj, mid, args);
break;
case 'F':
result.f = (*env)->CallFloatMethodV(env, obj, mid, args);
break;
case 'D':
result.d = (*env)->CallDoubleMethodV(env, obj, mid, args);
break;
default:
(*env)->FatalError(env, "JNU_CallMethodByNameV: illegal signature");
}
done1:
(*env)->DeleteLocalRef(env, clazz);
done2:
if (hasException) {
*hasException = (*env)->ExceptionCheck(env);
}
return result;
}
JNIEXPORT jobject JNICALL
JNU_NewObjectByName(JNIEnv *env, const char *class_name,
const char *constructor_sig, ...)
{
jobject obj = NULL;
jclass cls = 0;
jmethodID cls_initMID;
va_list args;
if ((*env)->EnsureLocalCapacity(env, 2) < 0)
goto done;
cls = (*env)->FindClass(env, class_name);
if (cls == 0) {
goto done;
}
cls_initMID = (*env)->GetMethodID(env, cls,
"<init>", constructor_sig);
if (cls_initMID == NULL) {
goto done;
}
va_start(args, constructor_sig);
obj = (*env)->NewObjectV(env, cls, cls_initMID, args);
va_end(args);
done:
(*env)->DeleteLocalRef(env, cls);
return obj;
}
/* Optimized for char set ISO_8559_1 */
static jstring
newString8859_1(JNIEnv *env, const char *str)
{
int len = (int)strlen(str);
jchar buf[512];
jchar *str1;
jstring result;
int i;
if (len > 512) {
str1 = (jchar *)malloc(len * sizeof(jchar));
if (str1 == 0) {
JNU_ThrowOutOfMemoryError(env, 0);
return 0;
}
} else
str1 = buf;
for (i=0;i<len;i++)
str1[i] = (unsigned char)str[i];
result = (*env)->NewString(env, str1, len);
if (str1 != buf)
free(str1);
return result;
}
static const char*
getString8859_1Chars(JNIEnv *env, jstring jstr)
{
int i;
char *result;
jint len = (*env)->GetStringLength(env, jstr);
const jchar *str = (*env)->GetStringCritical(env, jstr, 0);
if (str == 0) {
return 0;
}
result = MALLOC_MIN4(len);
if (result == 0) {
(*env)->ReleaseStringCritical(env, jstr, str);
JNU_ThrowOutOfMemoryError(env, 0);
return 0;
}
for (i=0; i<len; i++) {
jchar unicode = str[i];
if (unicode <= 0x00ff)
result[i] = (char)unicode;
else
result[i] = '?';
}
result[len] = 0;
(*env)->ReleaseStringCritical(env, jstr, str);
return result;
}
/* Optimized for char set ISO646-US (us-ascii) */
static jstring
newString646_US(JNIEnv *env, const char *str)
{
int len = strlen(str);
jchar buf[512];
jchar *str1;
jstring result;
int i;
if (len > 512) {
str1 = (jchar *)malloc(len * sizeof(jchar));
if (str1 == 0) {
JNU_ThrowOutOfMemoryError(env, 0);
return 0;
}
} else
str1 = buf;
for (i=0; i<len; i++) {
unsigned char c = (unsigned char)str[i];
if (c <= 0x7f)
str1[i] = c;
else
str1[i] = '?';
}
result = (*env)->NewString(env, str1, len);
if (str1 != buf)
free(str1);
return result;
}
static const char*
getString646_USChars(JNIEnv *env, jstring jstr)
{
int i;
char *result;
jint len = (*env)->GetStringLength(env, jstr);
const jchar *str = (*env)->GetStringCritical(env, jstr, 0);
if (str == 0) {
return 0;
}
result = MALLOC_MIN4(len);
if (result == 0) {
(*env)->ReleaseStringCritical(env, jstr, str);
JNU_ThrowOutOfMemoryError(env, 0);
return 0;
}
for (i=0; i<len; i++) {
jchar unicode = str[i];
if (unicode <= 0x007f )
result[i] = (char)unicode;
else
result[i] = '?';
}
result[len] = 0;
(*env)->ReleaseStringCritical(env, jstr, str);
return result;
}
/* enumeration of c1 row from Cp1252 */
static int cp1252c1chars[32] = {
0x20AC,0xFFFD,0x201A,0x0192,0x201E,0x2026,0x2020,0x2021,
0x02C6,0x2030,0x0160,0x2039,0x0152,0xFFFD,0x017D,0xFFFD,
0xFFFD,0x2018,0x2019,0x201C,0x201D,0x2022,0x2013,0x2014,
0x02Dc,0x2122,0x0161,0x203A,0x0153,0xFFFD,0x017E,0x0178
};
/* Optimized for char set Cp1252 */
static jstring
newStringCp1252(JNIEnv *env, const char *str)
{
int len = (int) strlen(str);
jchar buf[512];
jchar *str1;
jstring result;
int i;
if (len > 512) {
str1 = (jchar *)malloc(len * sizeof(jchar));
if (str1 == 0) {
JNU_ThrowOutOfMemoryError(env, 0);
return 0;
}
} else
str1 = buf;
for (i=0; i<len; i++) {
unsigned char c = (unsigned char)str[i];
if ((c >= 0x80) && (c <= 0x9f))
str1[i] = cp1252c1chars[c-128];
else
str1[i] = c;
}
result = (*env)->NewString(env, str1, len);
if (str1 != buf)
free(str1);
return result;
}
static const char*
getStringCp1252Chars(JNIEnv *env, jstring jstr)
{
int i;
char *result;
jint len = (*env)->GetStringLength(env, jstr);
const jchar *str = (*env)->GetStringCritical(env, jstr, 0);
if (str == 0) {
return 0;
}
result = MALLOC_MIN4(len);
if (result == 0) {
(*env)->ReleaseStringCritical(env, jstr, str);
JNU_ThrowOutOfMemoryError(env, 0);
return 0;
}
for (i=0; i<len; i++) {
jchar c = str[i];
if (c < 256)
result[i] = (char)c;
else switch(c) {
case 0x20AC: result[i] = (char)0x80; break;
case 0x201A: result[i] = (char)0x82; break;
case 0x0192: result[i] = (char)0x83; break;
case 0x201E: result[i] = (char)0x84; break;
case 0x2026: result[i] = (char)0x85; break;
case 0x2020: result[i] = (char)0x86; break;
case 0x2021: result[i] = (char)0x87; break;
case 0x02C6: result[i] = (char)0x88; break;
case 0x2030: result[i] = (char)0x89; break;
case 0x0160: result[i] = (char)0x8A; break;
case 0x2039: result[i] = (char)0x8B; break;
case 0x0152: result[i] = (char)0x8C; break;
case 0x017D: result[i] = (char)0x8E; break;
case 0x2018: result[i] = (char)0x91; break;
case 0x2019: result[i] = (char)0x92; break;
case 0x201C: result[i] = (char)0x93; break;
case 0x201D: result[i] = (char)0x94; break;
case 0x2022: result[i] = (char)0x95; break;
case 0x2013: result[i] = (char)0x96; break;
case 0x2014: result[i] = (char)0x97; break;
case 0x02DC: result[i] = (char)0x98; break;
case 0x2122: result[i] = (char)0x99; break;
case 0x0161: result[i] = (char)0x9A; break;
case 0x203A: result[i] = (char)0x9B; break;
case 0x0153: result[i] = (char)0x9C; break;
case 0x017E: result[i] = (char)0x9E; break;
case 0x0178: result[i] = (char)0x9F; break;
default: result[i] = '?'; break;
}
}
result[len] = 0;
(*env)->ReleaseStringCritical(env, jstr, str);
return result;
}
static int fastEncoding = NO_ENCODING_YET;
static jstring jnuEncoding = NULL;
/* Cached method IDs */
static jmethodID String_init_ID; /* String(byte[], enc) */
static jmethodID String_getBytes_ID; /* String.getBytes(enc) */
int getFastEncoding() {
return fastEncoding;
}
/* Initialize the fast encoding. If the "sun.jnu.encoding" property
* has not yet been set, we leave fastEncoding == NO_ENCODING_YET.
*/
void
initializeEncoding(JNIEnv *env)
{
jstring propname = 0;
jstring enc = 0;
if ((*env)->EnsureLocalCapacity(env, 3) < 0)
return;
propname = (*env)->NewStringUTF(env, "sun.jnu.encoding");
if (propname) {
jboolean exc;
enc = JNU_CallStaticMethodByName
(env,
&exc,
"java/lang/System",
"getProperty",
"(Ljava/lang/String;)Ljava/lang/String;",
propname).l;
if (!exc) {
if (enc) {
const char* encname = (*env)->GetStringUTFChars(env, enc, 0);
if (encname) {
/*
* On Solaris with nl_langinfo() called in GetJavaProperties():
*
* locale undefined -> NULL -> hardcoded default
* "C" locale -> "" -> hardcoded default (on 2.6)
* "C" locale -> "ISO646-US" (on Sol 7/8)
* "en_US" locale -> "ISO8859-1"
* "en_GB" locale -> "ISO8859-1" (on Sol 7/8)
* "en_UK" locale -> "ISO8859-1" (on 2.6)
*/
if ((strcmp(encname, "8859_1") == 0) ||
(strcmp(encname, "ISO8859-1") == 0) ||
(strcmp(encname, "ISO8859_1") == 0))
fastEncoding = FAST_8859_1;
else if (strcmp(encname, "ISO646-US") == 0)
fastEncoding = FAST_646_US;
else if (strcmp(encname, "Cp1252") == 0 ||
/* This is a temporary fix until we move */
/* to wide character versions of all Windows */
/* calls. */
strcmp(encname, "utf-16le") == 0)
fastEncoding = FAST_CP1252;
else {
fastEncoding = NO_FAST_ENCODING;
jnuEncoding = (jstring)(*env)->NewGlobalRef(env, enc);
}
(*env)->ReleaseStringUTFChars(env, enc, encname);
}
}
} else {
(*env)->ExceptionClear(env);
}
} else {
(*env)->ExceptionClear(env);
}
(*env)->DeleteLocalRef(env, propname);
(*env)->DeleteLocalRef(env, enc);
/* Initialize method-id cache */
String_getBytes_ID = (*env)->GetMethodID(env, JNU_ClassString(env),
"getBytes", "(Ljava/lang/String;)[B");
String_init_ID = (*env)->GetMethodID(env, JNU_ClassString(env),
"<init>", "([BLjava/lang/String;)V");
}
static jboolean isJNUEncodingSupported = JNI_FALSE;
static jboolean jnuEncodingSupported(JNIEnv *env) {
jboolean exe;
if (isJNUEncodingSupported == JNI_TRUE) {
return JNI_TRUE;
}
isJNUEncodingSupported = (jboolean) JNU_CallStaticMethodByName (
env, &exe,
"java/nio/charset/Charset",
"isSupported",
"(Ljava/lang/String;)Z",
jnuEncoding).z;
return isJNUEncodingSupported;
}
JNIEXPORT jstring
NewStringPlatform(JNIEnv *env, const char *str)
{
return JNU_NewStringPlatform(env, str);
}
JNIEXPORT jstring JNICALL
JNU_NewStringPlatform(JNIEnv *env, const char *str)
{
jstring result;
result = nativeNewStringPlatform(env, str);
if (result == NULL) {
jbyteArray hab = 0;
int len;
if (fastEncoding == NO_ENCODING_YET)
initializeEncoding(env);
if ((fastEncoding == FAST_8859_1) || (fastEncoding == NO_ENCODING_YET))
return newString8859_1(env, str);
if (fastEncoding == FAST_646_US)
return newString646_US(env, str);
if (fastEncoding == FAST_CP1252)
return newStringCp1252(env, str);
if ((*env)->EnsureLocalCapacity(env, 2) < 0)
return NULL;
len = (int)strlen(str);
hab = (*env)->NewByteArray(env, len);
if (hab != 0) {
(*env)->SetByteArrayRegion(env, hab, 0, len, (jbyte *)str);
if (jnuEncodingSupported(env)) {
result = (*env)->NewObject(env, JNU_ClassString(env),
String_init_ID, hab, jnuEncoding);
} else {
/*If the encoding specified in sun.jnu.encoding is not endorsed
by "Charset.isSupported" we have to fall back to use String(byte[])
explicitly here without specifying the encoding name, in which the
StringCoding class will pickup the iso-8859-1 as the fallback
converter for us.
*/
jmethodID mid = (*env)->GetMethodID(env, JNU_ClassString(env),
"<init>", "([B)V");
result = (*env)->NewObject(env, JNU_ClassString(env), mid, hab);
}
(*env)->DeleteLocalRef(env, hab);
return result;
}
}
return NULL;
}
JNIEXPORT const char *
GetStringPlatformChars(JNIEnv *env, jstring jstr, jboolean *isCopy)
{
return JNU_GetStringPlatformChars(env, jstr, isCopy);
}
JNIEXPORT const char * JNICALL
JNU_GetStringPlatformChars(JNIEnv *env, jstring jstr, jboolean *isCopy)
{
char *result = nativeGetStringPlatformChars(env, jstr, isCopy);
if (result == NULL) {
jbyteArray hab = 0;
if (isCopy)
*isCopy = JNI_TRUE;
if (fastEncoding == NO_ENCODING_YET)
initializeEncoding(env);
if ((fastEncoding == FAST_8859_1) || (fastEncoding == NO_ENCODING_YET))
return getString8859_1Chars(env, jstr);
if (fastEncoding == FAST_646_US)
return getString646_USChars(env, jstr);
if (fastEncoding == FAST_CP1252)
return getStringCp1252Chars(env, jstr);
if ((*env)->EnsureLocalCapacity(env, 2) < 0)
return 0;
if (jnuEncodingSupported(env)) {
hab = (*env)->CallObjectMethod(env, jstr, String_getBytes_ID, jnuEncoding);
} else {
jmethodID mid = (*env)->GetMethodID(env, JNU_ClassString(env),
"getBytes", "()[B");
hab = (*env)->CallObjectMethod(env, jstr, mid);
}
if (!(*env)->ExceptionCheck(env)) {
jint len = (*env)->GetArrayLength(env, hab);
result = MALLOC_MIN4(len);
if (result == 0) {
JNU_ThrowOutOfMemoryError(env, 0);
(*env)->DeleteLocalRef(env, hab);
return 0;
}
(*env)->GetByteArrayRegion(env, hab, 0, len, (jbyte *)result);
result[len] = 0; /* NULL-terminate */
}
(*env)->DeleteLocalRef(env, hab);
}
return result;
}
JNIEXPORT void JNICALL
JNU_ReleaseStringPlatformChars(JNIEnv *env, jstring jstr, const char *str)
{
free((void *)str);
}
/*
* Export the platform dependent path canonicalization so that
* VM can find it when loading system classes.
*
*/
extern int canonicalize(char *path, const char *out, int len);
JNIEXPORT int
Canonicalize(JNIEnv *env, char *orig, char *out, int len)
{
/* canonicalize an already natived path */
return canonicalize(orig, out, len);
}
JNIEXPORT jclass JNICALL
JNU_ClassString(JNIEnv *env)
{
static jclass cls = 0;
if (cls == 0) {
jclass c;
if ((*env)->EnsureLocalCapacity(env, 1) < 0)
return 0;
c = (*env)->FindClass(env, "java/lang/String");
cls = (*env)->NewGlobalRef(env, c);
(*env)->DeleteLocalRef(env, c);
}
return cls;
}
JNIEXPORT jclass JNICALL
JNU_ClassClass(JNIEnv *env)
{
static jclass cls = 0;
if (cls == 0) {
jclass c;
if ((*env)->EnsureLocalCapacity(env, 1) < 0)
return 0;
c = (*env)->FindClass(env, "java/lang/Class");
cls = (*env)->NewGlobalRef(env, c);
(*env)->DeleteLocalRef(env, c);
}
return cls;
}
JNIEXPORT jclass JNICALL
JNU_ClassObject(JNIEnv *env)
{
static jclass cls = 0;
if (cls == 0) {
jclass c;
if ((*env)->EnsureLocalCapacity(env, 1) < 0)
return 0;
c = (*env)->FindClass(env, "java/lang/Object");
cls = (*env)->NewGlobalRef(env, c);
(*env)->DeleteLocalRef(env, c);
}
return cls;
}
JNIEXPORT jclass JNICALL
JNU_ClassThrowable(JNIEnv *env)
{
static jclass cls = 0;
if (cls == 0) {
jclass c;
if ((*env)->EnsureLocalCapacity(env, 1) < 0)
return 0;
c = (*env)->FindClass(env, "java/lang/Throwable");
cls = (*env)->NewGlobalRef(env, c);
(*env)->DeleteLocalRef(env, c);
}
return cls;
}
JNIEXPORT jint JNICALL
JNU_CopyObjectArray(JNIEnv *env, jobjectArray dst, jobjectArray src,
jint count)
{
int i;
if ((*env)->EnsureLocalCapacity(env, 1) < 0)
return -1;
for (i=0; i<count; i++) {
jstring p = (*env)->GetObjectArrayElement(env, src, i);
(*env)->SetObjectArrayElement(env, dst, i, p);
(*env)->DeleteLocalRef(env, p);
}
return 0;
}
JNIEXPORT void * JNICALL
JNU_GetEnv(JavaVM *vm, jint version)
{
void *env;
(*vm)->GetEnv(vm, &env, version);
return env;
}
JNIEXPORT jint JNICALL
JNU_IsInstanceOfByName(JNIEnv *env, jobject object, char* classname)
{
jclass cls;
if ((*env)->EnsureLocalCapacity(env, 1) < 0)
return JNI_ERR;
cls = (*env)->FindClass(env, classname);
if (cls != NULL) {
jint result = (*env)->IsInstanceOf(env, object, cls);
(*env)->DeleteLocalRef(env, cls);
return result;
}
return JNI_ERR;
}
JNIEXPORT jboolean JNICALL
JNU_Equals(JNIEnv *env, jobject object1, jobject object2)
{
static jmethodID mid = NULL;
if (mid == NULL) {
mid = (*env)->GetMethodID(env, JNU_ClassObject(env), "equals",
"(Ljava/lang/Object;)Z");
}
return (*env)->CallBooleanMethod(env, object1, mid, object2);
}
/************************************************************************
* Thread calls
*/
static jmethodID Object_waitMID;
static jmethodID Object_notifyMID;
static jmethodID Object_notifyAllMID;
JNIEXPORT void JNICALL
JNU_MonitorWait(JNIEnv *env, jobject object, jlong timeout)
{
if (object == NULL) {
JNU_ThrowNullPointerException(env, "JNU_MonitorWait argument");
return;
}
if (Object_waitMID == NULL) {
jclass cls = JNU_ClassObject(env);
if (cls == NULL) {
return;
}
Object_waitMID = (*env)->GetMethodID(env, cls, "wait", "(J)V");
if (Object_waitMID == NULL) {
return;
}
}
(*env)->CallVoidMethod(env, object, Object_waitMID, timeout);
}
JNIEXPORT void JNICALL
JNU_Notify(JNIEnv *env, jobject object)
{
if (object == NULL) {
JNU_ThrowNullPointerException(env, "JNU_Notify argument");
return;
}
if (Object_notifyMID == NULL) {
jclass cls = JNU_ClassObject(env);
if (cls == NULL) {
return;
}
Object_notifyMID = (*env)->GetMethodID(env, cls, "notify", "()V");
if (Object_notifyMID == NULL) {
return;
}
}
(*env)->CallVoidMethod(env, object, Object_notifyMID);
}
JNIEXPORT void JNICALL
JNU_NotifyAll(JNIEnv *env, jobject object)
{
if (object == NULL) {
JNU_ThrowNullPointerException(env, "JNU_NotifyAll argument");
return;
}
if (Object_notifyAllMID == NULL) {
jclass cls = JNU_ClassObject(env);
if (cls == NULL) {
return;
}
Object_notifyAllMID = (*env)->GetMethodID(env, cls,"notifyAll", "()V");
if (Object_notifyAllMID == NULL) {
return;
}
}
(*env)->CallVoidMethod(env, object, Object_notifyAllMID);
}
/************************************************************************
* Debugging utilities
*/
JNIEXPORT void JNICALL
JNU_PrintString(JNIEnv *env, char *hdr, jstring string)
{
if (string == NULL) {
fprintf(stderr, "%s: is NULL\n", hdr);
} else {
const char *stringPtr = JNU_GetStringPlatformChars(env, string, 0);
if (stringPtr == 0)
return;
fprintf(stderr, "%s: %s\n", hdr, stringPtr);
JNU_ReleaseStringPlatformChars(env, string, stringPtr);
}
}
JNIEXPORT void JNICALL
JNU_PrintClass(JNIEnv *env, char* hdr, jobject object)
{
if (object == NULL) {
fprintf(stderr, "%s: object is NULL\n", hdr);
return;
} else {
jclass cls = (*env)->GetObjectClass(env, object);
jstring clsName = JNU_ToString(env, cls);
JNU_PrintString(env, hdr, clsName);
(*env)->DeleteLocalRef(env, cls);
(*env)->DeleteLocalRef(env, clsName);
}
}
JNIEXPORT jstring JNICALL
JNU_ToString(JNIEnv *env, jobject object)
{
if (object == NULL) {
return (*env)->NewStringUTF(env, "NULL");
} else {
return (jstring)JNU_CallMethodByName(env,
NULL,
object,
"toString",
"()Ljava/lang/String;").l;
}
}
JNIEXPORT jvalue JNICALL
JNU_GetFieldByName(JNIEnv *env,
jboolean *hasException,
jobject obj,
const char *name,
const char *signature)
{
jclass cls;
jfieldID fid;
jvalue result;
result.i = 0;
if ((*env)->EnsureLocalCapacity(env, 3) < 0)
goto done2;
cls = (*env)->GetObjectClass(env, obj);
fid = (*env)->GetFieldID(env, cls, name, signature);
if (fid == 0)
goto done1;
switch (*signature) {
case '[':
case 'L':
result.l = (*env)->GetObjectField(env, obj, fid);
break;
case 'Z':
result.z = (*env)->GetBooleanField(env, obj, fid);
break;
case 'B':
result.b = (*env)->GetByteField(env, obj, fid);
break;
case 'C':
result.c = (*env)->GetCharField(env, obj, fid);
break;
case 'S':
result.s = (*env)->GetShortField(env, obj, fid);
break;
case 'I':
result.i = (*env)->GetIntField(env, obj, fid);
break;
case 'J':
result.j = (*env)->GetLongField(env, obj, fid);
break;
case 'F':
result.f = (*env)->GetFloatField(env, obj, fid);
break;
case 'D':
result.d = (*env)->GetDoubleField(env, obj, fid);
break;
default:
(*env)->FatalError(env, "JNU_GetFieldByName: illegal signature");
}
done1:
(*env)->DeleteLocalRef(env, cls);
done2:
if (hasException) {
*hasException = (*env)->ExceptionCheck(env);
}
return result;
}
JNIEXPORT void JNICALL
JNU_SetFieldByName(JNIEnv *env,
jboolean *hasException,
jobject obj,
const char *name,
const char *signature,
...)
{
jclass cls;
jfieldID fid;
va_list args;
if ((*env)->EnsureLocalCapacity(env, 3) < 0)
goto done2;
cls = (*env)->GetObjectClass(env, obj);
fid = (*env)->GetFieldID(env, cls, name, signature);
if (fid == 0)
goto done1;
va_start(args, signature);
switch (*signature) {
case '[':
case 'L':
(*env)->SetObjectField(env, obj, fid, va_arg(args, jobject));
break;
case 'Z':
(*env)->SetBooleanField(env, obj, fid, (jboolean)va_arg(args, int));
break;
case 'B':
(*env)->SetByteField(env, obj, fid, (jbyte)va_arg(args, int));
break;
case 'C':
(*env)->SetCharField(env, obj, fid, (jchar)va_arg(args, int));
break;
case 'S':
(*env)->SetShortField(env, obj, fid, (jshort)va_arg(args, int));
break;
case 'I':
(*env)->SetIntField(env, obj, fid, va_arg(args, jint));
break;
case 'J':
(*env)->SetLongField(env, obj, fid, va_arg(args, jlong));
break;
case 'F':
(*env)->SetFloatField(env, obj, fid, (jfloat)va_arg(args, jdouble));
break;
case 'D':
(*env)->SetDoubleField(env, obj, fid, va_arg(args, jdouble));
break;
default:
(*env)->FatalError(env, "JNU_SetFieldByName: illegal signature");
}
va_end(args);
done1:
(*env)->DeleteLocalRef(env, cls);
done2:
if (hasException) {
*hasException = (*env)->ExceptionCheck(env);
}
}
JNIEXPORT jvalue JNICALL
JNU_GetStaticFieldByName(JNIEnv *env,
jboolean *hasException,
const char *classname,
const char *name,
const char *signature)
{
jclass cls;
jfieldID fid;
jvalue result;
result.i = 0;
if ((*env)->EnsureLocalCapacity(env, 3) < 0)
goto done2;
cls = (*env)->FindClass(env, classname);
if (cls == 0)
goto done2;
fid = (*env)->GetStaticFieldID(env, cls, name, signature);
if (fid == 0)
goto done1;
switch (*signature) {
case '[':
case 'L':
result.l = (*env)->GetStaticObjectField(env, cls, fid);
break;
case 'Z':
result.z = (*env)->GetStaticBooleanField(env, cls, fid);
break;
case 'B':
result.b = (*env)->GetStaticByteField(env, cls, fid);
break;
case 'C':
result.c = (*env)->GetStaticCharField(env, cls, fid);
break;
case 'S':
result.s = (*env)->GetStaticShortField(env, cls, fid);
break;
case 'I':
result.i = (*env)->GetStaticIntField(env, cls, fid);
break;
case 'J':
result.j = (*env)->GetStaticLongField(env, cls, fid);
break;
case 'F':
result.f = (*env)->GetStaticFloatField(env, cls, fid);
break;
case 'D':
result.d = (*env)->GetStaticDoubleField(env, cls, fid);
break;
default:
(*env)->FatalError(env, "JNU_GetStaticFieldByName: illegal signature");
}
done1:
(*env)->DeleteLocalRef(env, cls);
done2:
if (hasException) {
*hasException = (*env)->ExceptionCheck(env);
}
return result;
}
JNIEXPORT void JNICALL
JNU_SetStaticFieldByName(JNIEnv *env,
jboolean *hasException,
const char *classname,
const char *name,
const char *signature,
...)
{
jclass cls;
jfieldID fid;
va_list args;
if ((*env)->EnsureLocalCapacity(env, 3) < 0)
goto done2;
cls = (*env)->FindClass(env, classname);
if (cls == 0)
goto done2;
fid = (*env)->GetStaticFieldID(env, cls, name, signature);
if (fid == 0)
goto done1;
va_start(args, signature);
switch (*signature) {
case '[':
case 'L':
(*env)->SetStaticObjectField(env, cls, fid, va_arg(args, jobject));
break;
case 'Z':
(*env)->SetStaticBooleanField(env, cls, fid, (jboolean)va_arg(args, int));
break;
case 'B':
(*env)->SetStaticByteField(env, cls, fid, (jbyte)va_arg(args, int));
break;
case 'C':
(*env)->SetStaticCharField(env, cls, fid, (jchar)va_arg(args, int));
break;
case 'S':
(*env)->SetStaticShortField(env, cls, fid, (jshort)va_arg(args, int));
break;
case 'I':
(*env)->SetStaticIntField(env, cls, fid, va_arg(args, jint));
break;
case 'J':
(*env)->SetStaticLongField(env, cls, fid, va_arg(args, jlong));
break;
case 'F':
(*env)->SetStaticFloatField(env, cls, fid, (jfloat)va_arg(args, jdouble));
break;
case 'D':
(*env)->SetStaticDoubleField(env, cls, fid, va_arg(args, jdouble));
break;
default:
(*env)->FatalError(env, "JNU_SetStaticFieldByName: illegal signature");
}
va_end(args);
done1:
(*env)->DeleteLocalRef(env, cls);
done2:
if (hasException) {
*hasException = (*env)->ExceptionCheck(env);
}
}
Other Java examples (source code examples)Here is a short list of links related to this Java jni_util.c source code file: |
The search page
Other Java source code examples at this package level
Click here to learn more about this project
