You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: client.go
    path of file: ./repos/scan4all/pkg/hydra/vnc
    
    the code of the file until where you have to start completion: package vnc

import (
	"bytes"
	"encoding/binary"
	"fmt"
	"io"
	"net"
	"unicode"
)

type ClientConn struct {
	c      net.Conn
	config *ClientConfig

	// If the pixel format uses a color map, then this is the color
	// map that is used. This should not be modified directly, since
	// the data comes from the serve
    
func (c *ClientConn) SetPixelFormat(format *PixelFormat) error {
	var keyEvent [20]byte
	keyEvent[0] = 0

	pfBytes, err := writePixelFormat(format)
	if err != nil {
		return err
	}

	// Copy the pixel format bytes into the proper slice location
	copy(keyEvent[4:], pfBytes)

	// Send the data down the connection
	if _, err := c.c.Write(keyEvent[:]); err != nil {
		return err
	}

	// Reset the color map as according to RFC.
	var newColorMap [256]Color
	c.ColorMap = newColorMap

	return nil
}