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40 lines
734 B
Go
40 lines
734 B
Go
// Package bom is used to clean up UTF-8 Byte Order Marks.
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package bom
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import (
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"bufio"
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"io"
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)
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const (
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bom0 = 0xef
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bom1 = 0xbb
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bom2 = 0xbf
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)
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// Clean returns b with the 3 byte BOM stripped off the front if it is present.
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// If the BOM is not present, then b is returned.
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func Clean(b []byte) []byte {
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if len(b) >= 3 &&
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b[0] == bom0 &&
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b[1] == bom1 &&
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b[2] == bom2 {
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return b[3:]
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}
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return b
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}
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// NewReader returns an io.Reader that will skip over initial UTF-8 byte order marks.
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func NewReader(r io.Reader) io.Reader {
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buf := bufio.NewReader(r)
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b, err := buf.Peek(3)
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if err != nil {
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// not enough bytes
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return buf
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}
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if b[0] == bom0 && b[1] == bom1 && b[2] == bom2 {
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discardBytes(buf, 3)
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}
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return buf
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}
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