63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
// Copyright 2018 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package bitvector
|
|
|
|
import (
|
|
"errors"
|
|
)
|
|
|
|
var errInvalidLength = errors.New("invalid length")
|
|
|
|
type BitVector struct {
|
|
len int
|
|
b []byte
|
|
}
|
|
|
|
func New(l int) (bv *BitVector, err error) {
|
|
return NewFromBytes(make([]byte, l/8+1), l)
|
|
}
|
|
|
|
func NewFromBytes(b []byte, l int) (bv *BitVector, err error) {
|
|
if l <= 0 {
|
|
return nil, errInvalidLength
|
|
}
|
|
if len(b)*8 < l {
|
|
return nil, errInvalidLength
|
|
}
|
|
return &BitVector{
|
|
len: l,
|
|
b: b,
|
|
}, nil
|
|
}
|
|
|
|
func (bv *BitVector) Get(i int) bool {
|
|
bi := i / 8
|
|
return bv.b[bi]&(0x1<<uint(i%8)) != 0
|
|
}
|
|
|
|
func (bv *BitVector) Set(i int, v bool) {
|
|
bi := i / 8
|
|
cv := bv.Get(i)
|
|
if cv != v {
|
|
bv.b[bi] ^= 0x1 << uint8(i%8)
|
|
}
|
|
}
|
|
|
|
func (bv *BitVector) Bytes() []byte {
|
|
return bv.b
|
|
}
|