github.com/geniusesgroup/libgo@v0.0.0-20220713101832-828057a9d3d4/chapar/path.go (about)

     1  /* For license and copyright information please see LEGAL file in repository */
     2  
     3  package chapar
     4  
     5  import (
     6  	"io"
     7  
     8  	"../protocol"
     9  )
    10  
    11  // Path indicate Chapar switch route plan!
    12  type Path struct {
    13  	path [MaxHopCount]byte
    14  	len  byte
    15  }
    16  
    17  // Init sets path from the given frame
    18  func (p *Path) Init(frame []byte) {
    19  	if len(frame) == 0 {
    20  		p.len = MaxHopCount // broadcast frame
    21  	} else {
    22  		var hopCount = GetHopCount(frame)
    23  		copy(p.path[:], frame[FixedHeaderLength:FixedHeaderLength+hopCount])
    24  		p.len = hopCount
    25  	}
    26  }
    27  
    28  func (p *Path) Set(path []byte) {
    29  	copy(p.path[:], path)
    30  	p.len = byte(len(path))
    31  }
    32  
    33  func (p *Path) Get() []byte {
    34  	return p.path[:p.len]
    35  }
    36  
    37  func (p *Path) GetAsString() string {
    38  	// TODO::: ??
    39  	return string(p.path[:p.len])
    40  }
    41  
    42  func (p *Path) LenAsByte() byte {
    43  	return p.len
    44  }
    45  
    46  // GetReverse return path in all hops just in reverse.
    47  func (p *Path) GetReverse() (reverse Path) {
    48  	reverse = Path{
    49  		path: ReversePath(p.path[:]),
    50  		len:  p.len,
    51  	}
    52  	return
    53  }
    54  
    55  /*
    56  ********** protocol.Codec interface **********
    57   */
    58  
    59  func (p *Path) MediaType() protocol.MediaType       { return nil }
    60  func (p *Path) CompressType() protocol.CompressType { return nil }
    61  func (p *Path) Len() int                            { return int(p.len) }
    62  
    63  // Marshal return the path in the given frame.
    64  func (p *Path) Decode(reader io.Reader) (err protocol.Error) {
    65  	return
    66  }
    67  
    68  // Marshal return the path in the given frame.
    69  func (p *Path) Encode(writer io.Writer) (err error) {
    70  	return
    71  }
    72  
    73  // Unmarshal sets path from the given path
    74  func (p *Path) Unmarshal(path []byte) (err protocol.Error) {
    75  	if len(path) == 0 {
    76  		p.len = MaxHopCount // broadcast frame
    77  	} else {
    78  		copy(p.path[:], path)
    79  		p.len = byte(len(path))
    80  	}
    81  }
    82  
    83  // Marshal return the path in the given frame.
    84  func (p *Path) Marshal() (path []byte) {
    85  	return p.path[:p.len]
    86  }
    87  
    88  // MarshalTo sets the path in the given frame.
    89  func (p *Path) MarshalTo(frame []byte) {
    90  	copy(frame[FixedHeaderLength:], p.path[:p.len])
    91  }