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: eucjp.go
    path of file: ./repos/devspace/vendor/golang.org/x/text/encoding/japanese
    
    the code of the file until where you have to start completion: // Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// 
    
func (eucJPEncoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
	r, size := rune(0), 0
	for ; nSrc < len(src); nSrc += size {
		r = rune(src[nSrc])

		// Decode a 1-byte rune.
		if r < utf8.RuneSelf {
			size = 1

		} else {
			// Decode a multi-byte rune.
			r, size = utf8.DecodeRune(src[nSrc:])
			if size == 1 {
				// All valid runes of size 1 (those below utf8.RuneSelf) were
				// handled above. We have invalid UTF-8 or we haven't seen the
				// full character yet.
				if !atEOF && !utf8.FullRune(src[nSrc:]) {
					err = transform.ErrShortSrc
					break
				}
			}

			// func init checks that the switch covers all tables.
			switch {
			case encode0Low <= r && r < encode0High:
				if r = rune(encode0[r-encode0Low]); r != 0 {
					goto write2or3
				}
			case encode1Low <= r && r < encode1High:
				if r = rune(encode1[r-encode1Low]); r != 0 {
					goto write2or3
				}
			case encode2Low <= r && r < encode2High:
				if r = rune(encode2[r-encode2Low]); r != 0 {
					goto write2or3
				}
			case encode3Low <= r && r < encode3High:
				if r = rune(encode3[r-encode3Low]); r != 0 {
					goto write2or3
				}
			case encode4Low <= r && r < encode4High:
				if r = rune(encode4[r-encode4Low]); r != 0 {
					goto write2or3
				}
			case encode5Low <= r && r < encode5High:
				if 0xff61 <= r && r < 0xffa0 {
					goto write2
				}
				if r = rune(encode5[r-encode5Low]); r != 0 {
					goto write2or3
				}
			}
			err = internal.ErrASCIIReplacement
			break
		}

		if nDst >= len(dst) {
			err = transform.ErrShortDst
			break
		}
		dst[nDst] = uint8(r)
		nDst++
		continue

	write2or3:
		if r>>tableShift == jis0208 {
			if nDst+2 > len(dst) {
				err = transform.ErrShortDst
				break
			}
		} else {
			if nDst+3 > len(dst) {
				err = transform.ErrShortDst
				break
			}
			dst[nDst] = 0x8f
			nDst++
		}
		dst[nDst+0] = 0xa1 + uint8(r>>codeShift)&codeMask
		dst[nDst+1] = 0xa1 + uint8(r)&codeMask
		nDst += 2
		continue

	write2:
		if nDst+2 > len(dst) {
			err = transform.ErrShortDst
			break
		}
		dst[nDst+0] = 0x8e
		dst[nDst+1] = uint8(r - (0xff61 - 0xa1))
		nDst += 2
		continue
	}
	return nDst, nSrc, err
}