java.nio.Numbers Maven / Gradle / Ivy

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/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package java.nio;

import elemental2.core.Float32Array;
import elemental2.core.Float64Array;
import elemental2.core.Int32Array;
import elemental2.core.Int8Array;

class Numbers {
    static Int8Array wba = new Int8Array(8);
    static Int32Array wia = new Int32Array(wba.buffer, 0, 2);
    static Float32Array wfa = new Float32Array(wba.buffer, 0, 2);
    static Float64Array wda = new Float64Array(wba.buffer, 0, 1);

    public static final int floatToIntBits(float f) {
        wfa.setAt(0, (double) f);
        return (int)(double)wia.getAt(0);
    }

    public static final float intBitsToFloat(int i) {
        wia.setAt(0, (double) i);
        return (float)(double)wfa.getAt(0);
    }

    public static final double longBitsToDouble(long i) {
        return Double.longBitsToDouble(i);
    }

    public static final long doubleToRawLongBits(double i) {
        return Double.doubleToLongBits(i);
    }

    // TODO(jgw): Ugly hack to avoid longs.
    public static final void setDouble(double d) {
        wda.setAt(0, d);
    }

    public static final double getDouble() {
        return wda.getAt(0);
    }

    public static final int getLoInt() {
        return (int)(double)wia.getAt(0);
    }

    public static final int getHiInt() {
        return (int)(double)wia.getAt(1);
    }

    public static final void setLoInt(int i) {
        wia.setAt(0, (double)i);
    }

    public static final void setHiInt(int i) {
        wia.setAt(1, (double)i);
    }

    /**
     * Helper which writes a double value to the common buffer, then copies the specific
     * bytes back to the specified array at the given offset.
     */
    public static final void writeDoubleBytes(Int8Array byteArray, int offset, double value, ByteOrder order) {
        //TODO compare order with nativeOrder, if they don't match then copy data backward
        wda.setAt(0, value);
        for (int i = 0; i < 8; i++) {
            byteArray.setAt(i + offset, wba.getAt(i));
        }
    }

    /**
     * Helper which copies the specified bytes to the common buffer, then reads out
     * the double value that those bytes represent.
     */
    public static final double readDoubleBytes(Int8Array byteArray, int offset, ByteOrder order) {
        //TODO compare order with nativeOrder, if they don't match then copy data backward
        for (int i = 0; i < 8; i++) {
            wba.setAt(i, byteArray.getAt(offset + i));
        }
        return wda.getAt(0);
    }
}