utfbom

The package utfbom implements the detection of the BOM (Unicode Byte Order Mark) and removing as necessary. It can also return the encoding detected by the BOM.

Installation

go get -u github.com/dimchansky/utfbom

Example

package main

import (
    "bytes"
    "fmt"
    "io/ioutil"

    "github.com/dimchansky/utfbom"
)

func main() {
    trySkip([]byte("\xEF\xBB\xBFhello"))
    trySkip([]byte("hello"))
}

func trySkip(byteData []byte) {
    fmt.Println("Input:", byteData)

    // just skip BOM
    output, err := ioutil.ReadAll(utfbom.SkipOnly(bytes.NewReader(byteData)))
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println("ReadAll with BOM skipping", output)

    // skip BOM and detect encoding
    sr, enc := utfbom.Skip(bytes.NewReader(byteData))
    fmt.Printf("Detected encoding: %s\n", enc)
    output, err = ioutil.ReadAll(sr)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println("ReadAll with BOM detection and skipping", output)
    fmt.Println()
}

Output:

$ go run main.go
Input: [239 187 191 104 101 108 108 111]
ReadAll with BOM skipping [104 101 108 108 111]
Detected encoding: UTF8
ReadAll with BOM detection and skipping [104 101 108 108 111]

Input: [104 101 108 108 111]
ReadAll with BOM skipping [104 101 108 108 111]
Detected encoding: Unknown
ReadAll with BOM detection and skipping [104 101 108 108 111]