Method encodeBacklen

core/stream.go:605–635

encodeBacklen encodes a backlen value

(elementLen uint32)

// encodeBacklen encodes a backlen value
func (enc *Encoder) encodeBacklen(elementLen uint32) []byte {
	if elementLen <= 127 {
		return []byte{byte(elementLen)}
	} else if elementLen < (1<<14)-1 {
		return []byte{
			byte(0x80 | (elementLen >> 8)),
			byte(elementLen & 0xFF),
		}
	} else if elementLen < (1<<21)-1 {
		return []byte{
			byte(0xC0 | (elementLen >> 16)),
			byte((elementLen >> 8) & 0xFF),
			byte(elementLen & 0xFF),
		}
	} else if elementLen < (1<<28)-1 {
		return []byte{
			byte(0xE0 | (elementLen >> 24)),
			byte((elementLen >> 16) & 0xFF),
			byte((elementLen >> 8) & 0xFF),
			byte(elementLen & 0xFF),
		}
	} else {
		return []byte{
			0xF0,
			byte((elementLen >> 24) & 0xFF),
			byte((elementLen >> 16) & 0xFF),
			byte((elementLen >> 8) & 0xFF),
			byte(elementLen & 0xFF),
		}
	}
}

// writeStreamGroups writes stream groups
func (enc *Encoder) writeStreamGroups(groups []*model.StreamGroup, version uint) error {