Example usage for io.netty.buffer ByteBuf readerIndex

Introduction

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

Prototype

public abstract int readerIndex();

Source Link

Document

Returns the readerIndex of this buffer.

Usage

From source file:io.vertx.core.buffer.BufferTest.java

License:Open Source License

@Test
public void testAppendDoesNotModifyByteBufIndex() throws Exception {
    ByteBuf buf = Unpooled.copiedBuffer("foobar".getBytes());
    assertEquals(0, buf.readerIndex());
    assertEquals(6, buf.writerIndex());//from  ww w . j  a  v a2s. c  o  m
    Buffer buffer = Buffer.buffer(buf);
    Buffer other = Buffer.buffer("prefix");
    other.appendBuffer(buffer);
    assertEquals(0, buf.readerIndex());
    assertEquals(6, buf.writerIndex());
    assertEquals(other.toString(), "prefixfoobar");
}

---

From source file:io.vertx.core.dns.impl.decoder.RecordDecoder.java

License:Open Source License

static Function<DnsRecord, String> address(int octets) {
    return record -> {
        ByteBuf data = ((DnsRawRecord) record).content();
        int size = data.writerIndex() - data.readerIndex();
        if (size != octets) {
            throw new DecoderException("Invalid content length, or reader index when decoding address [index: "
                    + data.readerIndex() + ", expected length: " + octets + ", actual: " + size + "].");
        }/*from ww w  .j  a  v a  2 s. c  o m*/
        byte[] address = new byte[octets];
        data.getBytes(data.readerIndex(), address);
        try {
            return InetAddress.getByAddress(address).getHostAddress();
        } catch (UnknownHostException e) {
            throw new DecoderException("Could not convert address "
                    + data.toString(data.readerIndex(), size, CharsetUtil.UTF_8) + " to InetAddress.");
        }
    };
}

---

From source file:io.vertx.core.dns.impl.decoder.RecordDecoder.java

License:Open Source License

/**
 * Retrieves a domain name given a buffer containing a DNS packet. If the
 * name contains a pointer, the position of the buffer will be set to
 * directly after the pointer's index after the name has been read.
 *
 * @param buf the byte buffer containing the DNS packet
 * @return the domain name for an entry//from   w  w w . ja  va  2s .c  o m
 */
static String readName(ByteBuf buf) {
    int position = -1;
    StringBuilder name = new StringBuilder();
    for (int len = buf.readUnsignedByte(); buf.isReadable() && len != 0; len = buf.readUnsignedByte()) {
        boolean pointer = (len & 0xc0) == 0xc0;
        if (pointer) {
            if (position == -1) {
                position = buf.readerIndex() + 1;
            }
            buf.readerIndex((len & 0x3f) << 8 | buf.readUnsignedByte());
        } else {
            name.append(buf.toString(buf.readerIndex(), len, CharsetUtil.UTF_8)).append(".");
            buf.skipBytes(len);
        }
    }
    if (position != -1) {
        buf.readerIndex(position);
    }
    if (name.length() == 0) {
        return null;
    }
    return name.substring(0, name.length() - 1);
}

---

From source file:io.vertx.core.dns.impl.fix.DnsNameResolverContext.java

License:Apache License

private void onResponseAorAAAA(DnsRecordType qType, DnsQuestion question,
        AddressedEnvelope<DnsResponse, InetSocketAddress> envelope) {

    // We often get a bunch of CNAMES as well when we asked for A/AAAA.
    final DnsResponse response = envelope.content();
    final Map<String, String> cnames = buildAliasMap(response);
    final int answerCount = response.count(DnsSection.ANSWER);

    boolean found = false;
    for (int i = 0; i < answerCount; i++) {
        final DnsRecord r = response.recordAt(DnsSection.ANSWER, i);
        final DnsRecordType type = r.type();
        if (type != DnsRecordType.A && type != DnsRecordType.AAAA) {
            continue;
        }/*from w  w w. j a v  a2s .co m*/

        final String qName = question.name().toLowerCase(Locale.US);
        final String rName = r.name().toLowerCase(Locale.US);

        // Make sure the record is for the questioned domain.
        if (!rName.equals(qName)) {
            // Even if the record's name is not exactly same, it might be an alias defined in the CNAME records.
            String resolved = qName;
            do {
                resolved = cnames.get(resolved);
                if (rName.equals(resolved)) {
                    break;
                }
            } while (resolved != null);

            if (resolved == null) {
                continue;
            }
        }

        if (!(r instanceof DnsRawRecord)) {
            continue;
        }

        final ByteBuf content = ((ByteBufHolder) r).content();
        final int contentLen = content.readableBytes();
        if (contentLen != INADDRSZ4 && contentLen != INADDRSZ6) {
            continue;
        }

        final byte[] addrBytes = new byte[contentLen];
        content.getBytes(content.readerIndex(), addrBytes);

        final InetAddress resolved;
        try {
            resolved = InetAddress.getByAddress(hostname, addrBytes);
        } catch (UnknownHostException e) {
            // Should never reach here.
            throw new Error(e);
        }

        if (resolvedEntries == null) {
            resolvedEntries = new ArrayList<DnsCacheEntry>(8);
        }

        final DnsCacheEntry e = new DnsCacheEntry(hostname, resolved);
        resolveCache.cache(hostname, resolved, r.timeToLive(), parent.ch.eventLoop());
        resolvedEntries.add(e);
        found = true;

        // Note that we do not break from the loop here, so we decode/cache all A/AAAA records.
    }

    if (found) {
        return;
    }

    if (traceEnabled) {
        addTrace(envelope.sender(), "no matching " + qType + " record found");
    }

    // We aked for A/AAAA but we got only CNAME.
    if (!cnames.isEmpty()) {
        onResponseCNAME(question, envelope, cnames, false);
    }
}

---

From source file:io.vertx.core.dns.impl.fix.DnsNameResolverContext.java

License:Apache License

/**
 * Retrieves a domain name given a buffer containing a DNS packet. If the
 * name contains a pointer, the position of the buffer will be set to
 * directly after the pointer's index after the name has been read.
 *
 * @param in the byte buffer containing the DNS packet
 * @return the domain name for an entry/*  w  w w  .  j a  va 2  s.  c o  m*/
 */
public static String decodeName(ByteBuf in) {
    int position = -1;
    int checked = 0;
    final int end = in.writerIndex();
    final int readable = in.readableBytes();

    // Looking at the spec we should always have at least enough readable bytes to read a byte here but it seems
    // some servers do not respect this for empty names. So just workaround this and return an empty name in this
    // case.
    //
    // See:
    // - https://github.com/netty/netty/issues/5014
    // - https://www.ietf.org/rfc/rfc1035.txt , Section 3.1
    if (readable == 0) {
        return ".";
    }

    final StringBuilder name = new StringBuilder(readable << 1);
    while (in.isReadable()) {
        final int len = in.readUnsignedByte();
        final boolean pointer = (len & 0xc0) == 0xc0;
        if (pointer) {
            if (position == -1) {
                position = in.readerIndex() + 1;
            }

            if (!in.isReadable()) {
                throw new CorruptedFrameException("truncated pointer in a name");
            }

            final int next = (len & 0x3f) << 8 | in.readUnsignedByte();
            if (next >= end) {
                throw new CorruptedFrameException("name has an out-of-range pointer");
            }
            in.readerIndex(next);

            // check for loops
            checked += 2;
            if (checked >= end) {
                throw new CorruptedFrameException("name contains a loop.");
            }
        } else if (len != 0) {
            if (!in.isReadable(len)) {
                throw new CorruptedFrameException("truncated label in a name");
            }
            name.append(in.toString(in.readerIndex(), len, CharsetUtil.UTF_8)).append('.');
            in.skipBytes(len);
        } else { // len == 0
            break;
        }
    }

    if (position != -1) {
        in.readerIndex(position);
    }

    if (name.length() == 0) {
        return ".";
    }

    if (name.charAt(name.length() - 1) != '.') {
        name.append('.');
    }

    return name.toString();
}

---

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 ww .  ja  v  a2 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:io.viewserver.network.netty.IncomingMessageHandler.java

License:Apache License

@Override
protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> objects)
        throws Exception {
    final byte[] array;
    final int offset;
    final int length = byteBuf.readableBytes();
    //        try {
    if (byteBuf.hasArray()) {
        array = byteBuf.array();/*ww  w .ja  v  a2s. co m*/
        offset = byteBuf.arrayOffset() + byteBuf.readerIndex();
        networkMessageWheel.pushToWheel(new NettyChannel(channelHandlerContext.channel()), array, offset,
                length);
    } else {
        //                array = new byte[length];
        //                byteBuf.getBytes(byteBuf.readerIndex(), array, 0, length);
        //                offset = 0;
        networkMessageWheel.pushToWheel(new NettyChannel(channelHandlerContext.channel()),
                new ByteBufInputStream(byteBuf));
    }
    //        } finally {
    //            byteBuf.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 a2  s . 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.
 *///from w ww. j  av  a 2 s.co 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:jss.proto.ResultsetPacketTest.java

/**
 * ??/*from  www . j a va  2  s. c o  m*/
 */
@Test
@Ignore
public void testResultset() {
    ByteBuf buf = fromDumpBytes(BASIC_DUMP);
    System.out.println();

    int flags = CapabilityFlags.CLIENT_BASIC_FLAGS;
    PacketData data = new PacketData();

    readPacket(buf, data, flags);

    ByteBuf payload = data.payload;
    Dumper.hexDumpOut(payload);

    long fieldCount = int_lenenc(payload);

    readPacket(buf, data, flags);
    payload = data.payload;
    Dumper.hexDumpOut(payload);
    List<ColumnDefinition41> columns = Lists.newArrayList();
    for (long i = 0; i < fieldCount; i++) {
        ColumnDefinition41 packet = readPacket(payload, new ColumnDefinition41(), 0);
        System.out.println(packet);
        //            System.out.println("\n" + Dumper.hexDumpReadable(payload));
        //            System.out.println("\n" + Dumper.hexDumpReadable(buf));
        readPacket(buf, data, 0);
        payload = data.payload;
        columns.add(packet);
    }
    readPacket(buf, data, flags);
    payload = data.payload;
    System.out.println(readPacket(payload, new EOF_Packet(), flags));

    readPacket(buf, data, flags);
    payload = data.payload;
    //        System.out.println("\n" + Dumper.hexDumpReadable(buf));

    while (true) {
        readPacket(buf, data, flags);
        payload = data.payload;

        if (payload.getUnsignedByte(payload.readerIndex()) == 0xfe) {
            break;
        }

        System.out.printf("| ");
        for (long i = 0; i < fieldCount; i++) {
            System.out.printf(string_lenenc(payload).toString(UTF_8) + " | ");
        }
        System.out.println();
    }
    System.out.println(readPacket(payload, new EOF_Packet(), flags));
    System.out.println("\n" + Dumper.hexDumpReadable(buf));

}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• »