https://github.com/eclipse-vertx/vertx-sql-client: The Reactive MySQL Client (Eclipse) 
public class io.vertx.mysqlclient.impl.util.BufferUtils
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.vertx.mysqlclient.impl.util.BufferUtils
  super_class: java.lang.Object
{
  private static final byte TERMINAL;
    descriptor: B
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 0

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.vertx.mysqlclient.impl.util.BufferUtils this
         0: .line 18
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // io.vertx.mysqlclient.impl.util.BufferUtils this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/vertx/mysqlclient/impl/util/BufferUtils;

  public static java.lang.String readNullTerminatedString(io.netty.buffer.ByteBuf, java.nio.charset.Charset);
    descriptor: (Lio/netty/buffer/ByteBuf;Ljava/nio/charset/Charset;)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=4, args_size=2
        start local 0 // io.netty.buffer.ByteBuf buffer
        start local 1 // java.nio.charset.Charset charset
         0: .line 22
            aload 0 /* buffer */
            iconst_0
            invokevirtual io.netty.buffer.ByteBuf.bytesBefore:(B)I
            istore 2 /* len */
        start local 2 // int len
         1: .line 23
            aload 0 /* buffer */
            iload 2 /* len */
            aload 1 /* charset */
            invokevirtual io.netty.buffer.ByteBuf.readCharSequence:(ILjava/nio/charset/Charset;)Ljava/lang/CharSequence;
            invokeinterface java.lang.CharSequence.toString:()Ljava/lang/String;
            astore 3 /* s */
        start local 3 // java.lang.String s
         2: .line 24
            aload 0 /* buffer */
            invokevirtual io.netty.buffer.ByteBuf.readByte:()B
            pop
         3: .line 25
            aload 3 /* s */
            areturn
        end local 3 // java.lang.String s
        end local 2 // int len
        end local 1 // java.nio.charset.Charset charset
        end local 0 // io.netty.buffer.ByteBuf buffer
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    4     0   buffer  Lio/netty/buffer/ByteBuf;
            0    4     1  charset  Ljava/nio/charset/Charset;
            1    4     2      len  I
            2    4     3        s  Ljava/lang/String;
    MethodParameters:
         Name  Flags
      buffer   
      charset  

  public static java.lang.String readFixedLengthString(io.netty.buffer.ByteBuf, int, java.nio.charset.Charset);
    descriptor: (Lio/netty/buffer/ByteBuf;ILjava/nio/charset/Charset;)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // io.netty.buffer.ByteBuf buffer
        start local 1 // int length
        start local 2 // java.nio.charset.Charset charset
         0: .line 29
            aload 0 /* buffer */
            iload 1 /* length */
            aload 2 /* charset */
            invokevirtual io.netty.buffer.ByteBuf.readCharSequence:(ILjava/nio/charset/Charset;)Ljava/lang/CharSequence;
            invokeinterface java.lang.CharSequence.toString:()Ljava/lang/String;
            areturn
        end local 2 // java.nio.charset.Charset charset
        end local 1 // int length
        end local 0 // io.netty.buffer.ByteBuf buffer
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0   buffer  Lio/netty/buffer/ByteBuf;
            0    1     1   length  I
            0    1     2  charset  Ljava/nio/charset/Charset;
    MethodParameters:
         Name  Flags
      buffer   
      length   
      charset  

  public static void writeNullTerminatedString(io.netty.buffer.ByteBuf, java.lang.CharSequence, java.nio.charset.Charset);
    descriptor: (Lio/netty/buffer/ByteBuf;Ljava/lang/CharSequence;Ljava/nio/charset/Charset;)V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // io.netty.buffer.ByteBuf buffer
        start local 1 // java.lang.CharSequence charSequence
        start local 2 // java.nio.charset.Charset charset
         0: .line 33
            aload 0 /* buffer */
            aload 1 /* charSequence */
            aload 2 /* charset */
            invokevirtual io.netty.buffer.ByteBuf.writeCharSequence:(Ljava/lang/CharSequence;Ljava/nio/charset/Charset;)I
            pop
         1: .line 34
            aload 0 /* buffer */
            iconst_0
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
         2: .line 35
            return
        end local 2 // java.nio.charset.Charset charset
        end local 1 // java.lang.CharSequence charSequence
        end local 0 // io.netty.buffer.ByteBuf buffer
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    3     0        buffer  Lio/netty/buffer/ByteBuf;
            0    3     1  charSequence  Ljava/lang/CharSequence;
            0    3     2       charset  Ljava/nio/charset/Charset;
    MethodParameters:
              Name  Flags
      buffer        
      charSequence  
      charset       

  public static void writeLengthEncodedInteger(io.netty.buffer.ByteBuf, long);
    descriptor: (Lio/netty/buffer/ByteBuf;J)V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=3, args_size=2
        start local 0 // io.netty.buffer.ByteBuf buffer
        start local 1 // long value
         0: .line 38
            lload 1 /* value */
            ldc 251
            lcmp
            ifge 3
         1: .line 40
            aload 0 /* buffer */
            lload 1 /* value */
            l2i
            i2b
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
         2: .line 41
            goto 13
      StackMap locals:
      StackMap stack:
         3: lload 1 /* value */
            ldc 65535
            lcmp
            ifgt 7
         4: .line 43
            aload 0 /* buffer */
            sipush 252
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
         5: .line 44
            aload 0 /* buffer */
            lload 1 /* value */
            l2i
            invokevirtual io.netty.buffer.ByteBuf.writeShortLE:(I)Lio/netty/buffer/ByteBuf;
            pop
         6: .line 45
            goto 13
      StackMap locals:
      StackMap stack:
         7: lload 1 /* value */
            ldc 16777215
            lcmp
            ifge 11
         8: .line 47
            aload 0 /* buffer */
            sipush 253
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
         9: .line 48
            aload 0 /* buffer */
            lload 1 /* value */
            l2i
            invokevirtual io.netty.buffer.ByteBuf.writeMediumLE:(I)Lio/netty/buffer/ByteBuf;
            pop
        10: .line 49
            goto 13
        11: .line 51
      StackMap locals:
      StackMap stack:
            aload 0 /* buffer */
            sipush 254
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        12: .line 52
            aload 0 /* buffer */
            lload 1 /* value */
            invokevirtual io.netty.buffer.ByteBuf.writeLongLE:(J)Lio/netty/buffer/ByteBuf;
            pop
        13: .line 54
      StackMap locals:
      StackMap stack:
            return
        end local 1 // long value
        end local 0 // io.netty.buffer.ByteBuf buffer
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0   14     0  buffer  Lio/netty/buffer/ByteBuf;
            0   14     1   value  J
    MethodParameters:
        Name  Flags
      buffer  
      value   

  public static long readLengthEncodedInteger(io.netty.buffer.ByteBuf);
    descriptor: (Lio/netty/buffer/ByteBuf;)J
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // io.netty.buffer.ByteBuf buffer
         0: .line 57
            aload 0 /* buffer */
            invokevirtual io.netty.buffer.ByteBuf.readUnsignedByte:()S
            istore 1 /* firstByte */
        start local 1 // short firstByte
         1: .line 58
            iload 1 /* firstByte */
            tableswitch { // 251 - 254
                  251: 2
                  252: 3
                  253: 4
                  254: 5
              default: 6
          }
         2: .line 60
      StackMap locals: int
      StackMap stack:
            ldc -1
            lreturn
         3: .line 62
      StackMap locals:
      StackMap stack:
            aload 0 /* buffer */
            invokevirtual io.netty.buffer.ByteBuf.readUnsignedShortLE:()I
            i2l
            lreturn
         4: .line 64
      StackMap locals:
      StackMap stack:
            aload 0 /* buffer */
            invokevirtual io.netty.buffer.ByteBuf.readUnsignedMediumLE:()I
            i2l
            lreturn
         5: .line 66
      StackMap locals:
      StackMap stack:
            aload 0 /* buffer */
            invokevirtual io.netty.buffer.ByteBuf.readLongLE:()J
            lreturn
         6: .line 68
      StackMap locals:
      StackMap stack:
            iload 1 /* firstByte */
            i2l
            lreturn
        end local 1 // short firstByte
        end local 0 // io.netty.buffer.ByteBuf buffer
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    7     0     buffer  Lio/netty/buffer/ByteBuf;
            1    7     1  firstByte  S
    MethodParameters:
        Name  Flags
      buffer  

  public static void writeLengthEncodedString(io.netty.buffer.ByteBuf, java.lang.String, java.nio.charset.Charset);
    descriptor: (Lio/netty/buffer/ByteBuf;Ljava/lang/String;Ljava/nio/charset/Charset;)V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // io.netty.buffer.ByteBuf buffer
        start local 1 // java.lang.String value
        start local 2 // java.nio.charset.Charset charset
         0: .line 73
            aload 1 /* value */
            aload 2 /* charset */
            invokevirtual java.lang.String.getBytes:(Ljava/nio/charset/Charset;)[B
            astore 3 /* bytes */
        start local 3 // byte[] bytes
         1: .line 74
            aload 0 /* buffer */
            aload 3 /* bytes */
            arraylength
            i2l
            invokestatic io.vertx.mysqlclient.impl.util.BufferUtils.writeLengthEncodedInteger:(Lio/netty/buffer/ByteBuf;J)V
         2: .line 75
            aload 0 /* buffer */
            aload 3 /* bytes */
            invokevirtual io.netty.buffer.ByteBuf.writeBytes:([B)Lio/netty/buffer/ByteBuf;
            pop
         3: .line 76
            return
        end local 3 // byte[] bytes
        end local 2 // java.nio.charset.Charset charset
        end local 1 // java.lang.String value
        end local 0 // io.netty.buffer.ByteBuf buffer
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    4     0   buffer  Lio/netty/buffer/ByteBuf;
            0    4     1    value  Ljava/lang/String;
            0    4     2  charset  Ljava/nio/charset/Charset;
            1    4     3    bytes  [B
    MethodParameters:
         Name  Flags
      buffer   
      value    
      charset  

  public static java.lang.String readLengthEncodedString(io.netty.buffer.ByteBuf, java.nio.charset.Charset);
    descriptor: (Lio/netty/buffer/ByteBuf;Ljava/nio/charset/Charset;)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=4, args_size=2
        start local 0 // io.netty.buffer.ByteBuf buffer
        start local 1 // java.nio.charset.Charset charset
         0: .line 79
            aload 0 /* buffer */
            invokestatic io.vertx.mysqlclient.impl.util.BufferUtils.readLengthEncodedInteger:(Lio/netty/buffer/ByteBuf;)J
            lstore 2 /* length */
        start local 2 // long length
         1: .line 80
            aload 0 /* buffer */
            lload 2 /* length */
            l2i
            aload 1 /* charset */
            invokestatic io.vertx.mysqlclient.impl.util.BufferUtils.readFixedLengthString:(Lio/netty/buffer/ByteBuf;ILjava/nio/charset/Charset;)Ljava/lang/String;
            areturn
        end local 2 // long length
        end local 1 // java.nio.charset.Charset charset
        end local 0 // io.netty.buffer.ByteBuf buffer
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0   buffer  Lio/netty/buffer/ByteBuf;
            0    2     1  charset  Ljava/nio/charset/Charset;
            1    2     2   length  J
    MethodParameters:
         Name  Flags
      buffer   
      charset  
}
SourceFile: "BufferUtils.java"