io.questdb.std.Long256FromCharSequenceDecoder Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
 *
 *  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.
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package io.questdb.std;

public abstract class Long256FromCharSequenceDecoder implements Long256Acceptor {

    public static void decode(final CharSequence hexString, final int startPos, final int endPos, Long256Acceptor acceptor) throws NumericException {
        final int minPos = startPos - 16;
        int lim = endPos;
        int p = lim - 16;
        long l0 = parse64BitGroup(startPos, minPos, hexString, p, lim);
        lim = p;
        p = lim - 16;
        long l1 = parse64BitGroup(startPos, minPos, hexString, p, lim);
        lim = p;
        p -= 16;
        long l2 = parse64BitGroup(startPos, minPos, hexString, p, lim);
        lim = p;
        p -= 16;
        if (p > startPos) {
            // hex string too long
            throw NumericException.INSTANCE;
        }
        long l3 = parse64BitGroup(startPos, minPos, hexString, p, lim);

        acceptor.onDecoded(l0, l1, l2, l3);
    }

    public abstract void onDecoded(long l0, long l1, long l2, long l3);

    private static long parse64BitGroup(int startPos, int minPos, CharSequence hexString, int p, int lim) throws NumericException {
        assert minPos == startPos - 16;
        if (p >= startPos) {
            return Numbers.parseHexLong(hexString, p, lim);
        }

        if (p > minPos) {
            return Numbers.parseHexLong(hexString, startPos, lim);
        }

        return 0;
    }
}