netty.syslog.DecoderUtil.java Source code

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Here is the source code for netty.syslog.DecoderUtil.java

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/*
 *   Copyright (c) 2014 Intellectual Reserve, Inc.  All rights reserved.
 *
 *   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 netty.syslog;

import io.netty.buffer.ByteBuf;
import io.netty.handler.codec.DecoderException;
import io.netty.util.CharsetUtil;

class DecoderUtil {
    static int readDigit(ByteBuf buffer) {
        int digit = 0;
        while (buffer.readableBytes() > 0 && Character.isDigit(peek(buffer))) {
            digit = digit * 10 + buffer.readByte() - '0';
        }
        return digit;
    }

    static byte peek(ByteBuf buffer) {
        return buffer.getByte(buffer.readerIndex());
    }

    static void expect(ByteBuf buffer, char c) {
        if (buffer.readByte() != c) {
            throw new DecoderException("Expected " + c + " at index " + buffer.readerIndex());
        }
    }

    static String readStringToSpace(ByteBuf buffer, boolean checkNull) {
        if (checkNull && peek(buffer) == '-') {
            buffer.readByte();
            return null;
        }
        int length = -1;
        for (int i = buffer.readerIndex(); i < buffer.capacity(); i++) {
            if (buffer.getByte(i) == ' ') {
                length = i - buffer.readerIndex();
                break;
            }
        }
        if (length < 0) {
            length = buffer.readableBytes();
        }
        final String s = buffer.toString(buffer.readerIndex(), length, CharsetUtil.UTF_8);
        buffer.skipBytes(length);
        return s;
    }
}