vendor/golang.org/x/text/encoding/japanese/eucjp.go

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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package japanese

import (
	"unicode/utf8"

	"golang.org/x/text/encoding"
	"golang.org/x/text/encoding/internal"
	"golang.org/x/text/encoding/internal/identifier"
	"golang.org/x/text/transform"
)

// EUCJP is the EUC-JP encoding.
var EUCJP encoding.Encoding = &eucJP

var eucJP = internal.Encoding{
	&internal.SimpleEncoding{eucJPDecoder{}, eucJPEncoder{}},
	"EUC-JP",
	identifier.EUCPkdFmtJapanese,
}

type eucJPDecoder struct{ transform.NopResetter }

// See https://encoding.spec.whatwg.org/#euc-jp-decoder.
func (eucJPDecoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
	r, size := rune(0), 0
loop:
	for ; nSrc < len(src); nSrc += size {
		switch c0 := src[nSrc]; {
		case c0 < utf8.RuneSelf:
			r, size = rune(c0), 1

		case c0 == 0x8e:
			if nSrc+1 >= len(src) {
				if !atEOF {
					err = transform.ErrShortSrc
					break loop
				}
				r, size = utf8.RuneError, 1
				break
			}
			c1 := src[nSrc+1]
			switch {
			case c1 < 0xa1:
				r, size = utf8.RuneError, 1
			case c1 > 0xdf:
				r, size = utf8.RuneError, 2
				if c1 == 0xff {
					size = 1
				}
			default:
				r, size = rune(c1)+(0xff61-0xa1), 2
			}
		case c0 == 0x8f:
			if nSrc+2 >= len(src) {
				if !atEOF {
					err = transform.ErrShortSrc