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package bom
import (
"bytes"
"io"
"io/ioutil"
)
const (
bom0 = 0xef
bom1 = 0xbb
bom2 = 0xbf
)
// CleanBom returns b with the 3 byte BOM stripped off the front if it is present.
// If the BOM is not present, then b is returned.
func CleanBom(b []byte) []byte {
if len(b) >= 3 &&
b[0] == bom0 &&
b[1] == bom1 &&
b[2] == bom2 {
return b[3:]
}
return b
}
// NewReaderWithoutBom returns an io.Reader that will skip over initial UTF-8 byte order marks.
func NewReaderWithoutBom(r io.Reader) (io.Reader, error) {
bs, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
return bytes.NewReader(CleanBom(bs)), nil
}
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