Example usage for io.netty.buffer ByteBuf getByte

List of usage examples for io.netty.buffer ByteBuf getByte

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Introduction

In this page you can find the example usage for io.netty.buffer ByteBuf getByte.

Prototype

public abstract byte getByte(int index);

Source Link

Document

Gets a byte at the specified absolute index in this buffer.

Usage

From source file:io.reactivex.netty.protocol.http.sse.ServerSentEventDecoder.java

License:Apache License

private static ServerSentEvent.Type readCurrentFieldTypeFromBuffer(final ByteBuf fieldNameBuffer) {
    /**/*from  w ww .ja v  a 2s  . c  om*/
     * This code tries to eliminate the need of creating a string from the ByteBuf as the field names are very
     * constrained. The algorithm is as follows:
     *
     * -- Scan the bytes in the buffer.
     * -- If the first byte matches the expected field names then use the matching field name char array to verify
     * the rest of the field name.
     * -- If the first byte does not match, reject the field name.
     * -- After the first byte, exact match the rest of the field name with the expected field name, byte by byte.
     * -- If the name does not exactly match the expected value, then reject the field name.
     */
    ServerSentEvent.Type toReturn = ServerSentEvent.Type.Data;
    int readableBytes = fieldNameBuffer.readableBytes();
    final int readerIndexAtStart = fieldNameBuffer.readerIndex();
    char[] fieldNameToVerify = DATA_FIELD_NAME;
    boolean verified = false;
    int actualFieldNameIndexToCheck = 0; // Starts with 1 as the first char is validated by equality.
    for (int i = readerIndexAtStart; i < readableBytes; i++) {
        final char charAtI = (char) fieldNameBuffer.getByte(i);

        if (i == readerIndexAtStart) {
            switch (charAtI) { // See which among the known field names this buffer belongs.
            case 'e':
                fieldNameToVerify = EVENT_ID_FIELD_NAME;
                toReturn = ServerSentEvent.Type.EventType;
                break;
            case 'd':
                fieldNameToVerify = DATA_FIELD_NAME;
                toReturn = ServerSentEvent.Type.Data;
                break;
            case 'i':
                fieldNameToVerify = ID_FIELD_NAME;
                toReturn = ServerSentEvent.Type.Id;
                break;
            default:
                return null;
            }
        } else {
            if (++actualFieldNameIndexToCheck >= fieldNameToVerify.length
                    || charAtI != fieldNameToVerify[actualFieldNameIndexToCheck]) {
                // If the character does not match or the buffer is bigger than the expected name, then discard.
                verified = false;
                break;
            } else {
                // Verified till now. If all characters are matching then this stays as verified, else changed to false.
                verified = true;
            }
        }
    }

    if (verified) {
        return toReturn;
    } else {
        return null;
    }
}

From source file:io.scalecube.socketio.serialization.PacketFramer.java

License:Apache License

private static boolean isDelimiter(final ByteBuf buffer, final int index) {
    for (int i = 0; i < DELIMITER_BYTES_SIZE; i++) {
        if (buffer.getByte(index + i) != DELIMITER_BYTES[i]) {
            return false;
        }//w ww  .ja  v  a 2  s.c  o m
    }
    return true;
}

From source file:io.vertx.core.http.impl.Http1xOrH2CHandler.java

License:Open Source License

@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
    ByteBuf buf = (ByteBuf) msg;
    int len = Math.min(buf.readableBytes(), HTTP_2_PREFACE_ARRAY.length - current);
    int i = 0;/*  w  w  w . j  a va  2 s .c o m*/
    while (i < len) {
        if (buf.getByte(buf.readerIndex() + i) != HTTP_2_PREFACE_ARRAY[current + i]) {
            end(ctx, buf, false);
            return;
        }
        i++;
    }
    if (current + i == HTTP_2_PREFACE_ARRAY.length) {
        end(ctx, buf, true);
    } else {
        current += len;
        buf.release();
    }
}

From source file:jazmin.server.msg.codec.json.JSONDecoder.java

License:Open Source License

/**
 * Create a frame out of the {@link ByteBuf} and return it.
 *
 * @param   ctx             the {@link ChannelHandlerContext} which this {@link ByteToMessageDecoder} belongs to
 * @param   buffer          the {@link ByteBuf} from which to read data
 * @return  frame           the {@link ByteBuf} which represent the frame or {@code null} if no frame could
 *                          be created./*from w  w  w. ja v a2s  . c o  m*/
 */
protected ByteBuf decode(ChannelHandlerContext ctx, ByteBuf buffer) throws Exception {
    final int eol = findEndOfLine(buffer);
    if (!discarding) {
        if (eol >= 0) {
            final ByteBuf frame;
            final int length = eol - buffer.readerIndex();
            final int delimLength = buffer.getByte(eol) == '\r' ? 2 : 1;

            if (length > maxLength) {
                buffer.readerIndex(eol + delimLength);
                fail(ctx, length);
                return null;
            }

            if (stripDelimiter) {
                frame = buffer.readBytes(length);
                buffer.skipBytes(delimLength);
            } else {
                frame = buffer.readBytes(length + delimLength);
            }

            return frame;
        } else {
            final int length = buffer.readableBytes();
            if (length > maxLength) {
                discardedBytes = length;
                buffer.readerIndex(buffer.writerIndex());
                discarding = true;
                if (failFast) {
                    fail(ctx, "over " + discardedBytes);
                }
            }
            return null;
        }
    } else {
        if (eol >= 0) {
            final int length = discardedBytes + eol - buffer.readerIndex();
            final int delimLength = buffer.getByte(eol) == '\r' ? 2 : 1;
            buffer.readerIndex(eol + delimLength);
            discardedBytes = 0;
            discarding = false;
            if (!failFast) {
                fail(ctx, length);
            }
        } else {
            discardedBytes = buffer.readableBytes();
            buffer.readerIndex(buffer.writerIndex());
        }
        return null;
    }
}

From source file:jazmin.server.msg.codec.json.JSONDecoder.java

License:Open Source License

/**
 * Returns the index in the buffer of the end of line found.
 * Returns -1 if no end of line was found in the buffer.
 *//*w w  w  .j a va  2  s.  c  o  m*/
private static int findEndOfLine(final ByteBuf buffer) {
    final int n = buffer.writerIndex();
    for (int i = buffer.readerIndex(); i < n; i++) {
        final byte b = buffer.getByte(i);
        if (b == '\n') {
            return i;
        } else if (b == '\r' && i < n - 1 && buffer.getByte(i + 1) == '\n') {
            return i; // \r\n
        }
    }
    return -1; // Not found.
}

From source file:mysql.client.Session_Old.java

final String readString(ByteBuf buf, String encoding) throws Exception {
    int i = buf.readerIndex();
    int len = 0;// w ww . j a  v a2 s  .c  om
    int maxLen = buf.writerIndex();

    while ((i < maxLen) && (buf.getByte(i) != 0)) {
        len++;
        i++;
    }

    try {
        return StringUtils.toString(buf.array(), buf.readerIndex(), len, encoding);
    } catch (UnsupportedEncodingException uEE) {
        throw uEE;
    } finally {
        buf.readerIndex(buf.readerIndex() + (len + 1));
    }
}

From source file:net.epsilony.utils.codec.modbus.Utils.java

License:Open Source License

public static int crc(ByteBuf byteBuf, int start, int numBytes) {
    int polynomial = 0xA001;
    int crc = 0xFFFF;
    for (int i = start; i < start + numBytes; i++) {
        byte b = byteBuf.getByte(i);
        int low = (crc & 0xFF) ^ (b & 0xFF);
        crc &= (0xFF00);//from www  .  j a v  a2 s. com
        crc |= (low);
        for (int j = 0; j < 8; j++) {
            int t = crc & 0x01;
            crc >>= 1;
            if (t == 0) {
                continue;
            }
            crc ^= polynomial;
        }
    }
    int first = (crc & 0xFF) << 8;
    crc = (crc & 0xFF00) >> 8 | first;
    return crc;
}

From source file:net.hasor.rsf.protocol.rsf.RsfDecoder.java

License:Apache License

protected Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
    ByteBuf frame = (ByteBuf) super.decode(ctx, in);
    if (frame == null) {
        return null;
    }//  w  w  w  . j  a va2 s . com
    //
    byte rsfHead = frame.getByte(0);//??
    short status = this.doDecode(rsfHead, ctx, frame);//???
    if (status != ProtocolStatus.OK) {
        frame = frame.resetReaderIndex().skipBytes(1);
        long requestID = frame.readLong();
        ResponseInfo info = ProtocolUtils.buildResponseStatus(this.rsfEnvironment, requestID, status, null);
        ctx.pipeline().writeAndFlush(info);
    }
    return null;
}

From source file:net.hasor.rsf.remoting.transport.netty.RSFProtocolDecoder.java

License:Apache License

protected Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
    ByteBuf frame = (ByteBuf) super.decode(ctx, in);
    if (frame == null) {
        return null;
    }//from w w w.j a  v a  2  s. c  om
    //
    //* byte[1]  version                              RSF(0xC1)
    byte version = frame.getByte(0);
    short status = 0;
    //decode
    try {
        status = this.doDecode(version, ctx, frame);//???
    } catch (Throwable e) {
        status = ProtocolStatus.ProtocolError;
    } finally {
        if (status == ProtocolStatus.OK)
            return null;
        /*                    */
        frame = frame.resetReaderIndex().skipBytes(1);
        this.fireProtocolError(ctx, version, frame.readLong(), ProtocolStatus.ProtocolError);
    }
    return null;
}

From source file:net.openhft.fix.transport.codec.NettyFrameDecoder.java

License:Apache License

/**
 * TODO: loop for more messages in the ByteBuf
*///from  ww w  .j a  v  a 2s .  c om
void doDecode(ByteBuf in, List<Object> out) {
    if (m_msgLength == -1) {
        if (in.readableBytes() >= NettyFrameHelper.MSG_MIN_BYTES) {
            //int rindex = in.readerIndex();

            int bsi = in.indexOf(0, 12, NettyFrameHelper.BYTE_SOH);
            int bli = in.indexOf(12, 20, NettyFrameHelper.BYTE_SOH);

            // check the existence of:
            // - BeginString 8=
            // - BodyLength  9=
            if (in.getByte(0) == NettyFrameHelper.BYTE_BEGIN_STRING
                    && in.getByte(1) == NettyFrameHelper.BYTE_EQUALS
                    && in.getByte(bsi + 1) == NettyFrameHelper.BYTE_BODY_LENGTH
                    && in.getByte(bsi + 2) == NettyFrameHelper.BYTE_EQUALS) {

                int bodyLength = 0;
                for (int i = bsi + 3; i < bli; i++) {
                    bodyLength *= 10;
                    bodyLength += ((int) in.getByte(i) - (int) '0');
                }

                m_msgLength = 1 + bodyLength + bli + NettyFrameHelper.MSG_CSUM_LEN;
            } else {
                throw new Error("Unexpected state (header)");
            }
        }
    }

    if (m_msgLength != -1 && in.readableBytes() >= m_msgLength) {
        if (in.readableBytes() >= m_msgLength) {
            byte[] rv = new byte[m_msgLength];
            in.readBytes(rv);
            in.discardReadBytes();

            //TODO: validate checksum
            out.add(rv);

            m_msgLength = -1;
        } else {
            throw new Error("Unexpected state (body)");
        }
    }
}