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cseq.go
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cseq.go
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// Copyright 2011, Shelby Ramsey. All rights reserved.
// Copyright 2018, Eugen Biegler. All rights reserved.
// Use of this code is governed by a BSD license that can be
// found in the LICENSE.txt file.
package sipparser
// Imports from the go standard library
import (
"errors"
"strings"
)
// Cseq is a struct that holds the values for a cseq header:
// -- Val is the raw string value of the cseq hdr
// -- Method is the SIP method
// -- Digit is the numeric indicator for the method
type Cseq struct {
Val string
Method string
Digit string
}
func (c *Cseq) parse() error {
if len(c.Val) < 3 {
return errors.New("Cseq.parse err: length of CSeq is < 3")
}
s := strings.IndexRune(c.Val, ' ')
if s == -1 {
return errors.New("Cseq.parse err: lws err with: " + c.Val)
}
if s == 0 {
return errors.New("Cseq.parse err: lws at pos 0 in val: " + c.Val)
}
if len(c.Val)-1 < s+1 {
return errors.New("Cseq.parse err: first lws is end of line in val: " + c.Val)
}
c.Digit = c.Val[0:s]
if c.Val[s+1] != ' ' {
c.Method = c.Val[s+1:]
} else {
c.Method = cleanWs(c.Val[s+1:])
}
return nil
}