/*
Copyright Â© 2022 uscan team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package utils

func EncodeVarint(x uint64) []byte {
	var buf [8]byte
	var n int
	for n = 0; x > 127; n++ {
		buf[n] = 0x80 | uint8(x&0x7F)
		x >>= 7
	}
	buf[n] = uint8(x)
	n++
	return buf[0:n]
}

func DecodeVarint(buf []byte) (x uint64, n int) {
	for shift := uint(0); shift < 64; shift += 7 {
		if n >= len(buf) {
			return 0, 0
		}
		b := uint64(buf[n])
		n++
		x |= (b & 0x7F) << shift
		if (b & 0x80) == 0 {
			return x, n
		}
	}

	return 0, 0
}
