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: compress.go
    path of file: ./repos/moby/vendor/github.com/klauspost/compress/huff0
    
    the code of the file until where you have to start completion: package huff0

import (
	"fmt"
	"math"
	"runtime"
	"sync"
)

// Compress1X will compress the input.
// The output can be decoded using Decompress1X.
// Supply a Scratch object. The scratch object contains state about re-use,
// So when sharing across independent encodes, be sure to set the re-use policy.
func Compress1X(in []byte, s *Scratch) (out []byte, reUsed bool, err error) {
	s, err = s.prepare(in)
	if err != nil {
		return nil, false, err
	}
	return compress(in, s, s.compress1X)
}

// Compress4X will compress the input. The input is split into 4 independent blocks
// and compressed similar to Compress1X.
// The output can be decoded using Decompress4X.
// Supply a Scratch object. The scratch object contains state about re-use,
// So when sharing across independent encodes, 
    
func (s *Scratch) compress4X(src []byte) ([]byte, error) {
	if len(src) < 12 {
		return nil, ErrIncompressible
	}
	segmentSize := (len(src) + 3) / 4

	// Add placeholder for output length
	offsetIdx := len(s.Out)
	s.Out = append(s.Out, sixZeros[:]...)

	for i := 0; i < 4; i++ {
		toDo := src
		if len(toDo) > segmentSize {
			toDo = toDo[:segmentSize]
		}
		src = src[len(toDo):]

		idx := len(s.Out)
		s.Out = s.compress1xDo(s.Out, toDo)
		if len(s.Out)-idx > math.MaxUint16 {
			// We cannot store the size in the jump table
			return nil, ErrIncompressible
		}
		// Write compressed length as little endian before block.
		if i < 3 {
			// Last length is not written.
			length := len(s.Out) - idx
			s.Out[i*2+offsetIdx] = byte(length)
			s.Out[i*2+offsetIdx+1] = byte(length >> 8)
		}
	}

	return s.Out, nil
}