encoding.go

// Copyright Splunk, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package scriptedinputsreceiver

import (
	"fmt"
	"strings"

	"golang.org/x/text/encoding"
	"golang.org/x/text/encoding/ianaindex"
	"golang.org/x/text/encoding/unicode"
)

var encodingOverrides = map[string]encoding.Encoding{
	"utf-16":   unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM),
	"utf16":    unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM),
	"utf-8":    unicode.UTF8,
	"utf8":     unicode.UTF8,
	"ascii":    unicode.UTF8,
	"us-ascii": unicode.UTF8,
	"nop":      encoding.Nop,
	"":         unicode.UTF8,
}

func lookupEncoding(enc string) (encoding.Encoding, error) {
	if e, ok := encodingOverrides[strings.ToLower(enc)]; ok {
		return e, nil
	}
	e, err := ianaindex.IANA.Encoding(enc)
	if err != nil {
		return nil, fmt.Errorf("unsupported encoding '%s'", enc)
	}
	if e == nil {
		return nil, fmt.Errorf("no charmap defined for encoding '%s'", enc)
	}
	return e, nil
}