Function EncodeVarintAscending

pkg/util/encoding/encoding.go:306–332

EncodeVarintAscending encodes the int64 value using a variable length (length-prefixed) representation. The length is encoded as a single byte. If the value to be encoded is negative the length is encoded as 8-numBytes. If the value is positive it is encoded as 8+numBytes. The encoded bytes are appe

(b []byte, v int64)

// 8+numBytes. The encoded bytes are appended to the supplied buffer
// and the final buffer is returned.
func EncodeVarintAscending(b []byte, v int64) []byte {
	if v < 0 {
		switch {
		case v >= -0xff:
			return append(b, IntMin+7, byte(v))
		case v >= -0xffff:
			return append(b, IntMin+6, byte(v>>8), byte(v))
		case v >= -0xffffff:
			return append(b, IntMin+5, byte(v>>16), byte(v>>8), byte(v))
		case v >= -0xffffffff:
			return append(b, IntMin+4, byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
		case v >= -0xffffffffff:
			return append(b, IntMin+3, byte(v>>32), byte(v>>24), byte(v>>16), byte(v>>8),
				byte(v))
		case v >= -0xffffffffffff:
			return append(b, IntMin+2, byte(v>>40), byte(v>>32), byte(v>>24), byte(v>>16),
				byte(v>>8), byte(v))
		case v >= -0xffffffffffffff:
			return append(b, IntMin+1, byte(v>>48), byte(v>>40), byte(v>>32), byte(v>>24),
				byte(v>>16), byte(v>>8), byte(v))
		default:
			return append(b, IntMin, byte(v>>56), byte(v>>48), byte(v>>40), byte(v>>32),
				byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
		}
	}
	return EncodeUvarintAscending(b, uint64(v))
}

// EncodeVarintDescending encodes the int64 value so that it sorts in reverse
// order, from largest to smallest.