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/*
* Copyright (c) 1996, 2011, 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 "jni.h"
#include "jvm.h"
#include "jni_util.h"
#include "jlong.h"
#include <nativehelper/JNIHelp.h>
#define NATIVE_METHOD(className, functionName, signature) \
{ #functionName, signature, (void*)(Java_java_io_ ## className ## _ ## functionName) }
/*
* Class: java_io_ObjectInputStream
* Method: bytesToFloats
* Signature: ([BI[FII)V
*
* Reconstitutes nfloats float values from their byte representations. Byte
* values are read from array src starting at offset srcpos; the resulting
* float values are written to array dst starting at dstpos.
*/
JNIEXPORT void JNICALL
Java_java_io_ObjectInputStream_bytesToFloats(JNIEnv *env,
jclass this,
jbyteArray src,
jint srcpos,
jfloatArray dst,
jint dstpos,
jint nfloats)
{
union {
int i;
float f;
} u;
jfloat *floats;
jbyte *bytes;
jsize dstend;
jint ival;
if (nfloats == 0)
return;
/* fetch source array */
if (src == NULL) {
JNU_ThrowNullPointerException(env, NULL);
return;
}
bytes = (*env)->GetPrimitiveArrayCritical(env, src, NULL);
if (bytes == NULL) /* exception thrown */
return;
/* fetch dest array */
if (dst == NULL) {
(*env)->ReleasePrimitiveArrayCritical(env, src, bytes, JNI_ABORT);
JNU_ThrowNullPointerException(env, NULL);
return;
}
floats = (*env)->GetPrimitiveArrayCritical(env, dst, NULL);
if (floats == NULL) { /* exception thrown */
(*env)->ReleasePrimitiveArrayCritical(env, src, bytes, JNI_ABORT);
return;
}
/* do conversion */
dstend = dstpos + nfloats;
for ( ; dstpos < dstend; dstpos++) {
ival = ((bytes[srcpos + 0] & 0xFF) << 24) +
((bytes[srcpos + 1] & 0xFF) << 16) +
((bytes[srcpos + 2] & 0xFF) << 8) +
((bytes[srcpos + 3] & 0xFF) << 0);
u.i = (long) ival;
floats[dstpos] = (jfloat) u.f;
srcpos += 4;
}
(*env)->ReleasePrimitiveArrayCritical(env, src, bytes, JNI_ABORT);
(*env)->ReleasePrimitiveArrayCritical(env, dst, floats, 0);
}
/*
* Class: java_io_ObjectInputStream
* Method: bytesToDoubles
* Signature: ([BI[DII)V
*
* Reconstitutes ndoubles double values from their byte representations.
* Byte values are read from array src starting at offset srcpos; the
* resulting double values are written to array dst starting at dstpos.
*/
JNIEXPORT void JNICALL
Java_java_io_ObjectInputStream_bytesToDoubles(JNIEnv *env,
jclass this,
jbyteArray src,
jint srcpos,
jdoubleArray dst,
jint dstpos,
jint ndoubles)
{
union {
jlong l;
double d;
} u;
jdouble *doubles;
jbyte *bytes;
jsize dstend;
jlong lval;
if (ndoubles == 0)
return;
/* fetch source array */
if (src == NULL) {
JNU_ThrowNullPointerException(env, NULL);
return;
}
bytes = (*env)->GetPrimitiveArrayCritical(env, src, NULL);
if (bytes == NULL) /* exception thrown */
return;
/* fetch dest array */
if (dst == NULL) {
(*env)->ReleasePrimitiveArrayCritical(env, src, bytes, JNI_ABORT);
JNU_ThrowNullPointerException(env, NULL);
return;
}
doubles = (*env)->GetPrimitiveArrayCritical(env, dst, NULL);
if (doubles == NULL) { /* exception thrown */
(*env)->ReleasePrimitiveArrayCritical(env, src, bytes, JNI_ABORT);
return;
}
/* do conversion */
dstend = dstpos + ndoubles;
for ( ; dstpos < dstend; dstpos++) {
lval = (((jlong) bytes[srcpos + 0] & 0xFF) << 56) +
(((jlong) bytes[srcpos + 1] & 0xFF) << 48) +
(((jlong) bytes[srcpos + 2] & 0xFF) << 40) +
(((jlong) bytes[srcpos + 3] & 0xFF) << 32) +
(((jlong) bytes[srcpos + 4] & 0xFF) << 24) +
(((jlong) bytes[srcpos + 5] & 0xFF) << 16) +
(((jlong) bytes[srcpos + 6] & 0xFF) << 8) +
(((jlong) bytes[srcpos + 7] & 0xFF) << 0);
jlong_to_jdouble_bits(&lval);
u.l = lval;
doubles[dstpos] = (jdouble) u.d;
srcpos += 8;
}
(*env)->ReleasePrimitiveArrayCritical(env, src, bytes, JNI_ABORT);
(*env)->ReleasePrimitiveArrayCritical(env, dst, doubles, 0);
}
static JNINativeMethod gMethods[] = {
NATIVE_METHOD(ObjectInputStream, bytesToFloats, "([BI[FII)V"),
NATIVE_METHOD(ObjectInputStream, bytesToDoubles, "([BI[DII)V"),
};
void register_java_io_ObjectInputStream(JNIEnv* env) {
jniRegisterNativeMethods(env, "java/io/ObjectInputStream", gMethods, NELEM(gMethods));
}
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