mirror of
https://github.com/prometheus-community/windows_exporter.git
synced 2026-10-17 10:09:05 +02:00
50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package textfile
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import (
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"bufio"
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"bytes"
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"errors"
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"io"
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)
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// skipUTF8BOM removes one leading UTF-8 BOM and rejects UTF-16/32 BOMs.
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// The buffered reader is also reused by the metrics parser.
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func skipUTF8BOM(r *bufio.Reader) error {
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prefix, err := r.Peek(4)
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if err != nil && !errors.Is(err, io.EOF) {
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return err
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}
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switch {
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case bytes.HasPrefix(prefix, []byte("\x00\x00\xfe\xff")):
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return errors.New("UTF32BigEndian")
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case bytes.HasPrefix(prefix, []byte("\xff\xfe\x00\x00")):
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return errors.New("UTF32LittleEndian")
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case bytes.HasPrefix(prefix, []byte("\xfe\xff")):
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return errors.New("UTF16BigEndian")
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case bytes.HasPrefix(prefix, []byte("\xff\xfe")):
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return errors.New("UTF16LittleEndian")
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case bytes.HasPrefix(prefix, []byte("\xef\xbb\xbf")):
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_, err = r.Discard(3)
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return err
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default:
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return nil
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}
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}
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