ByteBuf() — netty Function Reference

Architecture documentation for the ByteBuf() function in PcapWriteHandlerTest.java from the netty codebase.

Function java Buffer Allocators

Entity Profile

Buffer→ Allocators→ ByteBuf() — netty Function Reference

Dependency Diagram

graph TD
  b84fec5c_87b9_1439_093b_27366b21fb2d["ByteBuf()"]
  e9f4993c_4935_9405_4fab_0bbc9030a673["PcapWriteHandlerTest"]
  b84fec5c_87b9_1439_093b_27366b21fb2d -->|defined in| e9f4993c_4935_9405_4fab_0bbc9030a673
  style b84fec5c_87b9_1439_093b_27366b21fb2d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

handler/src/test/java/io/netty/handler/pcap/PcapWriteHandlerTest.java lines 1245–1277

    private static ByteBuf verifyTcpBaseHeaders(ByteBuf byteBuf, InetSocketAddress destinationAddress,
                                                int expectedPayloadLength) {
        // Verify Pcap Packet Header
        byteBuf.readInt(); // Just read, we don't care about timestamps for now
        byteBuf.readInt(); // Just read, we don't care about timestamps for now
        assertEquals(54 + expectedPayloadLength, byteBuf.readInt()); // Length of Packet Saved In Pcap
        assertEquals(54 + expectedPayloadLength, byteBuf.readInt()); // Actual Length of Packet

        // -------------------------------------------- Verify Packet --------------------------------------------
        // Verify Ethernet Packet
        ByteBuf ethernetPacket = byteBuf.readSlice(54 + expectedPayloadLength);
        ByteBuf dstMac = ethernetPacket.readSlice(6);
        ByteBuf srcMac = ethernetPacket.readSlice(6);
        assertArrayEquals(new byte[] { 0, 0, 94, 0, 83, -1 }, ByteBufUtil.getBytes(dstMac));
        assertArrayEquals(new byte[] { 0, 0, 94, 0, 83, 0 }, ByteBufUtil.getBytes(srcMac));
        assertEquals(0x0800, ethernetPacket.readShort());

        // Verify IPv4 Packet
        ByteBuf ipv4Packet = ethernetPacket.readSlice(40 + expectedPayloadLength);
        assertEquals(0x45, ipv4Packet.readByte());    // Version + IHL
        assertEquals(0x00, ipv4Packet.readByte());    // DSCP
        assertEquals(40 + expectedPayloadLength, ipv4Packet.readUnsignedShort());     // Length
        assertEquals(0x0000, ipv4Packet.readShort()); // Identification
        assertEquals(0x0000, ipv4Packet.readShort()); // Fragment
        assertEquals((byte) 0xff, ipv4Packet.readByte());      // TTL
        assertEquals((byte) 6, ipv4Packet.readByte());        // Protocol
        assertEquals(0, ipv4Packet.readShort());      // Checksum
        // Source IPv4 Address
        ipv4Packet.readInt();
        // Destination IPv4 Address
        assertEquals(NetUtil.ipv4AddressToInt((Inet4Address) destinationAddress.getAddress()), ipv4Packet.readInt());
        return ipv4Packet.readSlice(20 + expectedPayloadLength);
    }