Checking in vendor folder for ease of using go get.

vendor/golang.org/x/text/encoding/ianaindex/ianaindex.go

@@ -0,0 +1,209 @@
+// Copyright 2015 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.
+
+//go:generate go run gen.go
+
+// Package ianaindex maps names to Encodings as specified by the IANA registry.
+// This includes both the MIME and IANA names.
+//
+// See http://www.iana.org/assignments/character-sets/character-sets.xhtml for
+// more details.
+package ianaindex
+
+import (
+	"errors"
+	"sort"
+	"strings"
+
+	"golang.org/x/text/encoding"
+	"golang.org/x/text/encoding/charmap"
+	"golang.org/x/text/encoding/internal/identifier"
+	"golang.org/x/text/encoding/japanese"
+	"golang.org/x/text/encoding/korean"
+	"golang.org/x/text/encoding/simplifiedchinese"
+	"golang.org/x/text/encoding/traditionalchinese"
+	"golang.org/x/text/encoding/unicode"
+)
+
+// TODO: remove the "Status... incomplete" in the package doc comment.
+// TODO: allow users to specify their own aliases?
+// TODO: allow users to specify their own indexes?
+// TODO: allow canonicalizing names
+
+// NOTE: only use these top-level variables if we can get the linker to drop
+// the indexes when they are not used. Make them a function or perhaps only
+// support MIME otherwise.
+
+var (
+	// MIME is an index to map MIME names.
+	MIME *Index = mime
+
+	// IANA is an index that supports all names and aliases using IANA names as
+	// the canonical identifier.
+	IANA *Index = iana
+
+	// MIB is an index that associates the MIB display name with an Encoding.
+	MIB *Index = mib
+
+	mime = &Index{mimeName, ianaToMIB, ianaAliases, encodings[:]}
+	iana = &Index{ianaName, ianaToMIB, ianaAliases, encodings[:]}
+	mib  = &Index{mibName, ianaToMIB, ianaAliases, encodings[:]}
+)
+
+// Index maps names registered by IANA to Encodings.
+// Currently different Indexes only differ in the names they return for
+// encodings. In the future they may also differ in supported aliases.
+type Index struct {
+	names func(i int) string
+	toMIB []identifier.MIB // Sorted slice of supported MIBs
+	alias map[string]int
+	enc   []encoding.Encoding
+}
+
+var (
+	errInvalidName = errors.New("ianaindex: invalid encoding name")
+	errUnknown     = errors.New("ianaindex: unknown Encoding")
+	errUnsupported = errors.New("ianaindex: unsupported Encoding")
+)
+
+// Encoding returns an Encoding for IANA-registered names. Matching is
+// case-insensitive.
+func (x *Index) Encoding(name string) (encoding.Encoding, error) {
+	name = strings.TrimSpace(name)
+	// First try without lowercasing (possibly creating an allocation).
+	i, ok := x.alias[name]
+	if !ok {
+		i, ok = x.alias[strings.ToLower(name)]
+		if !ok {
+			return nil, errInvalidName
+		}
+	}
+	return x.enc[i], nil
+}
+
+// Name reports the canonical name of the given Encoding. It will return an
+// error if the e is not associated with a known encoding scheme.
+func (x *Index) Name(e encoding.Encoding) (string, error) {
+	id, ok := e.(identifier.Interface)
+	if !ok {
+		return "", errUnknown
+	}
+	mib, _ := id.ID()
+	if mib == 0 {
+		return "", errUnknown
+	}
+	v := findMIB(x.toMIB, mib)
+	if v == -1 {
+		return "", errUnsupported
+	}
+	return x.names(v), nil
+}
+
+// TODO: the coverage of this index is rather spotty. Allowing users to set
+// encodings would allow:
+// - users to increase coverage
+// - allow a partially loaded set of encodings in case the user doesn't need to
+//   them all.
+// - write an OS-specific wrapper for supported encodings and set them.
+// The exact definition of Set depends a bit on if and how we want to let users
+// write their own Encoding implementations. Also, it is not possible yet to
+// only partially load the encodings without doing some refactoring. Until this
+// is solved, we might as well not support Set.
+// // Set sets the e to be used for the encoding scheme identified by name. Only
+// // canonical names may be used. An empty name assigns e to its internally
+// // associated encoding scheme.
+// func (x *Index) Set(name string, e encoding.Encoding) error {
+// 	panic("TODO: implement")
+// }
+
+func findMIB(x []identifier.MIB, mib identifier.MIB) int {
+	i := sort.Search(len(x), func(i int) bool { return x[i] >= mib })
+	if i < len(x) && x[i] == mib {
+		return i
+	}
+	return -1
+}
+
+const maxMIMENameLen = '0' - 1 // officially 40, but we leave some buffer.
+
+func mimeName(x int) string {
+	n := ianaNames[x]
+	// See gen.go for a description of the encoding.
+	if n[0] <= maxMIMENameLen {
+		return n[1:n[0]]
+	}
+	return n
+}
+
+func ianaName(x int) string {
+	n := ianaNames[x]
+	// See gen.go for a description of the encoding.
+	if n[0] <= maxMIMENameLen {
+		return n[n[0]:]
+	}
+	return n
+}
+
+func mibName(x int) string {
+	return mibNames[x]
+}
+
+var encodings = [numIANA]encoding.Encoding{
+	enc106:  unicode.UTF8,
+	enc1015: unicode.UTF16(unicode.BigEndian, unicode.UseBOM),
+	enc1013: unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM),
+	enc1014: unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM),
+	enc2028: charmap.CodePage037,
+	enc2011: charmap.CodePage437,
+	enc2009: charmap.CodePage850,
+	enc2010: charmap.CodePage852,
+	enc2046: charmap.CodePage855,
+	enc2089: charmap.CodePage858,
+	enc2048: charmap.CodePage860,
+	enc2013: charmap.CodePage862,
+	enc2050: charmap.CodePage863,
+	enc2052: charmap.CodePage865,
+	enc2086: charmap.CodePage866,
+	enc2102: charmap.CodePage1047,
+	enc2091: charmap.CodePage1140,
+	enc4:    charmap.ISO8859_1,
+	enc5:    charmap.ISO8859_2,
+	enc6:    charmap.ISO8859_3,
+	enc7:    charmap.ISO8859_4,
+	enc8:    charmap.ISO8859_5,
+	enc9:    charmap.ISO8859_6,
+	enc81:   charmap.ISO8859_6E,
+	enc82:   charmap.ISO8859_6I,
+	enc10:   charmap.ISO8859_7,
+	enc11:   charmap.ISO8859_8,
+	enc84:   charmap.ISO8859_8E,
+	enc85:   charmap.ISO8859_8I,
+	enc12:   charmap.ISO8859_9,
+	enc13:   charmap.ISO8859_10,
+	enc109:  charmap.ISO8859_13,
+	enc110:  charmap.ISO8859_14,
+	enc111:  charmap.ISO8859_15,
+	enc112:  charmap.ISO8859_16,
+	enc2084: charmap.KOI8R,
+	enc2088: charmap.KOI8U,
+	enc2027: charmap.Macintosh,
+	enc2109: charmap.Windows874,
+	enc2250: charmap.Windows1250,
+	enc2251: charmap.Windows1251,
+	enc2252: charmap.Windows1252,
+	enc2253: charmap.Windows1253,
+	enc2254: charmap.Windows1254,
+	enc2255: charmap.Windows1255,
+	enc2256: charmap.Windows1256,
+	enc2257: charmap.Windows1257,
+	enc2258: charmap.Windows1258,
+	enc18:   japanese.EUCJP,
+	enc39:   japanese.ISO2022JP,
+	enc17:   japanese.ShiftJIS,
+	enc38:   korean.EUCKR,
+	enc114:  simplifiedchinese.GB18030,
+	enc113:  simplifiedchinese.GBK,
+	enc2085: simplifiedchinese.HZGB2312,
+	enc2026: traditionalchinese.Big5,
+}