Golang encoding/asn1.BitString type, At and RightAlign inner functions example

package encoding/asn1

BitString is the structure to use when you want an ASN.1 BIT STRING type. A bit string is padded up to the nearest byte in memory and the number of valid bits is recorded. Padding bits will be zero.

BitString's At function returns the bit at the given index. If the index is out of range it returns false.

BitString's RightAlign function returns a slice where the padding bits are at the beginning. The slice may share memory with the BitString.

Golang encoding/asn1.BitString type and inner functions usage example

 package main

 import (
 "encoding/asn1"
 "fmt"
 )

 func main() {
 var bstr asn1.BitString

 bstr.Bytes = []byte{0x82, 0x40}
 bstr.BitLength = 16

 fmt.Println(bstr.At(0))
 fmt.Println(bstr.RightAlign)

 }

Output :

1

0x22a0

Reference :

http://golang.org/pkg/encoding/asn1/#BitString