/*

 * 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 "java_lang_Float.h"

#include "java_lang_Double.h"

#include "java_io_ObjectInputStream.h"

/*

 * 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);

}