// The zero value for Buffer is an empty buffer ready to use.
type Buffer struct {
	buf      []byte // contents are the bytes buf[off : len(buf)]
	off      int    // read at &buf[off], write at &buf[len(buf)]
	lastRead readOp // last read operation, so that Unread* can work correctly.

	// Copying and modifying a non-zero Buffer is prone to error,

			return err
		}
		if buf.Bytes()[buf.Len()-1] == '\n' {
			buf.Truncate(buf.Len() - 1)
		}
		buf.WriteString(s3Select.Output.CSVArgs.RecordDelimiter)

		return nil
	case jsonFormat:
		err := record.WriteJSON(buf)
		if err != nil {
			return err
		}
		// Trim trailing newline from non-simd output
		if buf.Bytes()[buf.Len()-1] == '\n' {
			buf.Truncate(buf.Len() - 1)
		}

	v := PartialOperation{}
	var buf bytes.Buffer
	msgp.Encode(&buf, &v)

	m := v.Msgsize()
	if buf.Len() > m {
		t.Log("WARNING: TestEncodeDecodePartialOperation Msgsize() is inaccurate")
	}

	vn := PartialOperation{}
	err := msgp.Decode(&buf, &vn)
	if err != nil {
		t.Error(err)
	}

	buf.Reset()
	msgp.Encode(&buf, &v)
	err = msgp.NewReader(&buf).Skip()
	if err != nil {
		t.Error(err)
	}

	v := listPathOptions{}
	var buf bytes.Buffer
	msgp.Encode(&buf, &v)

	m := v.Msgsize()
	if buf.Len() > m {
		t.Log("WARNING: TestEncodeDecodelistPathOptions Msgsize() is inaccurate")
	}

	vn := listPathOptions{}
	err := msgp.Decode(&buf, &vn)
	if err != nil {
		t.Error(err)
	}

	buf.Reset()
	msgp.Encode(&buf, &v)
	err = msgp.NewReader(&buf).Skip()
	if err != nil {
		t.Error(err)
	}
}

	v := WalkDirOptions{}
	var buf bytes.Buffer
	msgp.Encode(&buf, &v)

	m := v.Msgsize()
	if buf.Len() > m {
		t.Log("WARNING: TestEncodeDecodeWalkDirOptions Msgsize() is inaccurate")
	}

	vn := WalkDirOptions{}
	err := msgp.Decode(&buf, &vn)
	if err != nil {
		t.Error(err)
	}

	buf.Reset()
	msgp.Encode(&buf, &v)
	err = msgp.NewReader(&buf).Skip()
	if err != nil {
		t.Error(err)
	}
}

	v := SiteResyncStatus{}
	var buf bytes.Buffer
	msgp.Encode(&buf, &v)

	m := v.Msgsize()
	if buf.Len() > m {
		t.Log("WARNING: TestEncodeDecodeSiteResyncStatus Msgsize() is inaccurate")
	}

	vn := SiteResyncStatus{}
	err := msgp.Decode(&buf, &vn)
	if err != nil {
		t.Error(err)
	}

	buf.Reset()
	msgp.Encode(&buf, &v)
	err = msgp.NewReader(&buf).Skip()
	if err != nil {
		t.Error(err)
	}

	v := TierConfigMgr{}
	var buf bytes.Buffer
	msgp.Encode(&buf, &v)

	m := v.Msgsize()
	if buf.Len() > m {
		t.Log("WARNING: TestEncodeDecodeTierConfigMgr Msgsize() is inaccurate")
	}

	vn := TierConfigMgr{}
	err := msgp.Decode(&buf, &vn)
	if err != nil {
		t.Error(err)
	}

	buf.Reset()
	msgp.Encode(&buf, &v)
	err = msgp.NewReader(&buf).Skip()
	if err != nil {
		t.Error(err)
	}
}

	data := []byte(strings.Repeat("a", 512))
	buf := make([]byte, 512)

	for b.Loop() {
		rb.Write(data)
		rb.Read(buf)
	}
}

func BenchmarkRingBuffer_AsyncRead(b *testing.B) {
	// Pretty useless benchmark, but it's here for completeness.
	rb := New(1024)
	data := []byte(strings.Repeat("a", 512))
	buf := make([]byte, 512)

	go func() {
		for {
			rb.Read(buf)
		}
	}()

	for b.Loop() {

			case "rune":
				s = "int32"
			}
		}
		buf.WriteString(s)

	case *types.Array:
		fmt.Fprintf(buf, "[%d]", typ.Len())
		w.writeType(buf, typ.Elem())

	case *types.Slice:
		buf.WriteString("[]")
		w.writeType(buf, typ.Elem())

	case *types.Struct:
		buf.WriteString("struct")

	case *types.Pointer:
		buf.WriteByte('*')
		w.writeType(buf, typ.Elem())

	case *types.Tuple:

			if err != nil {
				t.Fatalf("write failed: %v", err)
			}
			wroteBytes += n
			wrote.Write(buf[:n])
			debugln("WRITE 2\t", writeRng.Intn(len(buf)), wroteBytes)

			// WriteByte
			err = rb.WriteByte(buf[0])
			if err != nil {
				t.Fatalf("write failed: %v", err)
			}
			wroteBytes++
			wrote.Write(buf[:1])
			debugln("WRITE 3\t", 1, wroteBytes)