284 lines
8.1 KiB
Java
284 lines
8.1 KiB
Java
/*
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* Copyright (c) 2023, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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package java.util;
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import java.lang.invoke.MethodHandle;
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import jdk.internal.vm.annotation.Stable;
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/**
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* Digits provides a fast methodology for converting integers and longs to
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* ASCII strings.
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*
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* @since 21
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*/
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sealed interface Digits permits Digits.DecimalDigits, Digits.HexDigits, Digits.OctalDigits {
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/**
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* Insert digits for long value in buffer from high index to low index.
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*
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* @param value value to convert
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* @param buffer byte buffer to copy into
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* @param index insert point + 1
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* @param putCharMH method to put character
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*
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* @return the last index used
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*
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* @throws Throwable if putCharMH fails (unusual).
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*/
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int digits(long value, byte[] buffer, int index,
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MethodHandle putCharMH) throws Throwable;
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/**
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* Calculate the number of digits required to represent the long.
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*
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* @param value value to convert
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*
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* @return number of digits
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*/
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int size(long value);
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/**
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* Digits class for decimal digits.
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*/
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final class DecimalDigits implements Digits {
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@Stable
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private static final short[] DIGITS;
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/**
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* Singleton instance of DecimalDigits.
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*/
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static final Digits INSTANCE = new DecimalDigits();
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static {
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short[] digits = new short[10 * 10];
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for (int i = 0; i < 10; i++) {
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short hi = (short) ((i + '0') << 8);
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for (int j = 0; j < 10; j++) {
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short lo = (short) (j + '0');
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digits[i * 10 + j] = (short) (hi | lo);
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}
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}
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DIGITS = digits;
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}
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/**
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* Constructor.
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*/
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private DecimalDigits() {
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}
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@Override
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public int digits(long value, byte[] buffer, int index,
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MethodHandle putCharMH) throws Throwable {
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boolean negative = value < 0;
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if (!negative) {
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value = -value;
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}
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long q;
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int r;
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while (value <= Integer.MIN_VALUE) {
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q = value / 100;
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r = (int)((q * 100) - value);
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value = q;
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int digits = DIGITS[r];
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putCharMH.invokeExact(buffer, --index, digits & 0xFF);
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putCharMH.invokeExact(buffer, --index, digits >> 8);
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}
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int iq, ivalue = (int)value;
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while (ivalue <= -100) {
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iq = ivalue / 100;
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r = (iq * 100) - ivalue;
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ivalue = iq;
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int digits = DIGITS[r];
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putCharMH.invokeExact(buffer, --index, digits & 0xFF);
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putCharMH.invokeExact(buffer, --index, digits >> 8);
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}
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if (ivalue < 0) {
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ivalue = -ivalue;
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}
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int digits = DIGITS[ivalue];
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putCharMH.invokeExact(buffer, --index, digits & 0xFF);
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if (9 < ivalue) {
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putCharMH.invokeExact(buffer, --index, digits >> 8);
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}
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if (negative) {
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putCharMH.invokeExact(buffer, --index, (int)'-');
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}
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return index;
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}
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@Override
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public int size(long value) {
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boolean negative = value < 0;
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int sign = negative ? 1 : 0;
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if (!negative) {
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value = -value;
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}
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long precision = -10;
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for (int i = 1; i < 19; i++) {
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if (value > precision)
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return i + sign;
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precision = 10 * precision;
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}
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return 19 + sign;
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}
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}
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/**
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* Digits class for hexadecimal digits.
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*/
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final class HexDigits implements Digits {
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@Stable
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private static final short[] DIGITS;
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/**
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* Singleton instance of HexDigits.
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*/
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static final Digits INSTANCE = new HexDigits();
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static {
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short[] digits = new short[16 * 16];
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for (int i = 0; i < 16; i++) {
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short hi = (short) ((i < 10 ? i + '0' : i - 10 + 'a') << 8);
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for (int j = 0; j < 16; j++) {
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short lo = (short) (j < 10 ? j + '0' : j - 10 + 'a');
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digits[(i << 4) + j] = (short) (hi | lo);
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}
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}
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DIGITS = digits;
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}
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/**
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* Constructor.
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*/
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private HexDigits() {
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}
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@Override
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public int digits(long value, byte[] buffer, int index,
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MethodHandle putCharMH) throws Throwable {
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while ((value & ~0xFF) != 0) {
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int digits = DIGITS[(int) (value & 0xFF)];
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value >>>= 8;
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putCharMH.invokeExact(buffer, --index, digits & 0xFF);
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putCharMH.invokeExact(buffer, --index, digits >> 8);
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}
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int digits = DIGITS[(int) (value & 0xFF)];
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putCharMH.invokeExact(buffer, --index, digits & 0xFF);
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if (0xF < value) {
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putCharMH.invokeExact(buffer, --index, digits >> 8);
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}
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return index;
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}
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@Override
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public int size(long value) {
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return value == 0 ? 1 :
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67 - Long.numberOfLeadingZeros(value) >> 2;
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}
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}
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/**
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* Digits class for octal digits.
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*/
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final class OctalDigits implements Digits {
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@Stable
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private static final short[] DIGITS;
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/**
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* Singleton instance of OctalDigits.
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*/
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static final Digits INSTANCE = new OctalDigits();
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static {
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short[] digits = new short[8 * 8];
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for (int i = 0; i < 8; i++) {
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short hi = (short) ((i + '0') << 8);
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for (int j = 0; j < 8; j++) {
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short lo = (short) (j + '0');
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digits[(i << 3) + j] = (short) (hi | lo);
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}
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}
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DIGITS = digits;
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}
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/**
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* Constructor.
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*/
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private OctalDigits() {
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}
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@Override
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public int digits(long value, byte[] buffer, int index,
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MethodHandle putCharMH) throws Throwable {
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while ((value & ~0x3F) != 0) {
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int digits = DIGITS[(int) (value & 0x3F)];
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value >>>= 6;
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putCharMH.invokeExact(buffer, --index, digits & 0xFF);
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putCharMH.invokeExact(buffer, --index, digits >> 8);
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}
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int digits = DIGITS[(int) (value & 0x3F)];
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putCharMH.invokeExact(buffer, --index, digits & 0xFF);
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if (7 < value) {
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putCharMH.invokeExact(buffer, --index, digits >> 8);
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}
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return index;
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}
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@Override
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public int size(long value) {
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return (66 - Long.numberOfLeadingZeros(value)) / 3;
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}
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}
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}
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