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90 lines
2.0 KiB
90 lines
2.0 KiB
// -*-go-*-
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// Copyright 2020 Justine Alexandra Roberts Tunney
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package sip
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import (
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"errors"
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"fmt"
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"github.com/jart/gosip/sdp"
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)
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%% machine msg;
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%% include sip "sip.rl";
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%% write data;
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// ParseMsg turns a SIP message byte slice into a data structure.
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func ParseMsg(data []byte) (msg *Msg, err error) {
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if data == nil {
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return nil, nil
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}
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msg = new(Msg)
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viap := &msg.Via
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cs := 0
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p := 0
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pe := len(data)
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eof := len(data)
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buf := make([]byte, len(data))
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amt := 0
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mark := 0
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clen := 0
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ctype := ""
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var name string
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var hex byte
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var value *string
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var via *Via
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var addrp **Addr
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var addr *Addr
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%% main := Message;
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%% write init;
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%% write exec;
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if cs < msg_first_final {
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if p == pe {
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return nil, MsgIncompleteError{data}
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} else {
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return nil, MsgParseError{Msg: data, Offset: p}
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}
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}
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if clen > 0 {
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if clen != len(data) - p {
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return nil, errors.New(fmt.Sprintf("Content-Length incorrect: %d != %d", clen, len(data) - p))
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}
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if ctype == sdp.ContentType {
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ms, err := sdp.Parse(string(data[p:len(data)]))
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if err != nil {
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return nil, err
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}
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msg.Payload = ms
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} else {
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msg.Payload = &MiscPayload{T: ctype, D: data[p:len(data)]}
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}
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}
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return msg, nil
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}
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func lookAheadWSP(data []byte, p, pe int) bool {
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return p + 2 < pe && (data[p+2] == ' ' || data[p+2] == '\t')
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}
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func lastAddr(addrp **Addr) **Addr {
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if *addrp == nil {
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return addrp
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} else {
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return lastAddr(&(*addrp).Next)
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}
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}
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