55 lines
1.0 KiB
Go
55 lines
1.0 KiB
Go
package spec
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import (
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"io"
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)
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// T is the Tag in a TLV structure
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type T byte
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// NewT returns a T with sequenceID. If this packet contains other
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// packets, this packet will be a "node packet", the T of this packet
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// will set MSB to T.
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func NewT(seqID int) (T, error) {
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if seqID < 0 || seqID > maxSeqID {
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return 0, errInvalidSeqID
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}
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return T(seqID), nil
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}
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// Sid returns the sequenceID of this packet.
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func (t T) Sid() int {
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return int(t & wipeFlagBits)
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}
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// Bytes returns raw bytes of T.
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func (t T) Bytes() []byte {
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return []byte{byte(t)}
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}
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// IsNodeMode will return true if this packet contains other packets.
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// Otherwise return flase.
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func (t T) IsNodeMode() bool {
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return t&flagBitNode == flagBitNode
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}
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// SetNodeMode will set T to indicates this packet contains
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// other packets.
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func (t *T) SetNodeMode(flag bool) {
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if flag {
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*t |= flagBitNode
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}
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}
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// Size return the size of T raw bytes.
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func (t T) Size() int {
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return 1
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}
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// ReadT read T from a bufio.Reader
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func ReadT(rd io.Reader) (T, error) {
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b, err := readByte(rd)
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return T(b), err
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}
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