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package protocol
// StreamType encodes if this is a unidirectional or bidirectional stream
type StreamType uint8
const (
// StreamTypeUni is a unidirectional stream
StreamTypeUni StreamType = iota
// StreamTypeBidi is a bidirectional stream
StreamTypeBidi
)
// InvalidPacketNumber is a stream ID that is invalid.
// The first valid stream ID in QUIC is 0.
const InvalidStreamID StreamID = -1
// StreamNum is the stream number
type StreamNum int64
const (
// InvalidStreamNum is an invalid stream number.
InvalidStreamNum = -1
// MaxStreamCount is the maximum stream count value that can be sent in MAX_STREAMS frames
// and as the stream count in the transport parameters
MaxStreamCount StreamNum = 1 << 60
)
// StreamID calculates the stream ID.
func (s StreamNum) StreamID(stype StreamType, pers Perspective) StreamID {
if s == 0 {
return InvalidStreamID
}
var first StreamID
switch stype {
case StreamTypeBidi:
switch pers {
case PerspectiveClient:
first = 0
case PerspectiveServer:
first = 1
}
case StreamTypeUni:
switch pers {
case PerspectiveClient:
first = 2
case PerspectiveServer:
first = 3
}
}
return first + 4*StreamID(s-1)
}
// A StreamID in QUIC
type StreamID int64
// InitiatedBy says if the stream was initiated by the client or by the server
func (s StreamID) InitiatedBy() Perspective {
if s%2 == 0 {
return PerspectiveClient
}
return PerspectiveServer
}
// Type says if this is a unidirectional or bidirectional stream
func (s StreamID) Type() StreamType {
if s%4 >= 2 {
return StreamTypeUni
}
return StreamTypeBidi
}
// StreamNum returns how many streams in total are below this
// Example: for stream 9 it returns 3 (i.e. streams 1, 5 and 9)
func (s StreamID) StreamNum() StreamNum {
return StreamNum(s/4) + 1
}
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