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SessionDescriptorGrammar.cpp
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SessionDescriptorGrammar.cpp
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/**
* This file is part of WebP2P.
*
* WebP2P is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* WebP2P is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with WebP2P. If not, see <http://www.gnu.org/licenses/>.
*
* Filename: SessionDescriptorGrammar.cpp
* Author(s): Dries Staelens
* Copyright: Copyright (c) 2010 Dries Staelens
* Description: Implementation for the RFC 4566 SDP grammar rules.
* See: http://tools.ietf.org/html/rfc4566
**/
/* STL includes */
#include <sstream>
/* Boost includes */
#include <boost/spirit/include/phoenix_algorithm.hpp>
#include <boost/spirit/include/phoenix_bind.hpp>
#include <boost/spirit/include/phoenix_container.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/spirit/include/phoenix_function.hpp>
#include <boost/spirit/include/phoenix_object.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_scope.hpp>
#include <boost/spirit/include/phoenix_statement.hpp>
/* WebP2P includes */
#include "SessionDescriptorData.hpp"
#include "SessionDescriptorGrammar.hpp"
SessionDescriptorGrammar::SessionDescriptorGrammar() :
SessionDescriptorGrammar::base_type(session_description) {
/* UTF-8 not supported in spirit::qi, fallback to iso-8859-1 so at least
* the entire byte range is accepted.
**/
using boost::spirit::qi::iso8859_1::string;
using boost::spirit::qi::iso8859_1::char_;
using boost::spirit::qi::iso8859_1::space;
using namespace boost::spirit::qi::iso8859_1;
using namespace boost::spirit::qi;
using boost::spirit::eol;
using namespace boost::phoenix;
using namespace boost::phoenix::local_names;
/* Define error handler */
on_error<fail>
(
session_description,
let(_s = construct<std::string>())
[
_s += val("Error! Expecting "),
//_s += _4, // TODO: figure out why this doesn't work
_s += val(" here: \""),
_s += construct<std::string>(_3, _2),
_s += val("\"\n"),
throw_(construct<ParseException>(_s))
]
);
/* The start symbol */
session_description %= proto_version
>> origin_field
>> session_name_field
// >> information_field
// >> uri_field
// >> email_fields
// >> phone_fields
// >> -connection_field
// >> bandwidth_fields
>> time_fields
// >> key_field
>> attribute_fields
>> media_descriptions;
/* SDP fields */
proto_version %= lit("v=")
>> ulong_long >> eol;
origin_field %= lit("o=")
>> username >> lit(' ')
>> sess_id >> lit(' ')
>> sess_version >> lit(' ')
>> nettype >> lit(' ')
>> addrtype >> lit(' ')
>> sdp.unicast_address >> eol;
session_name_field %= lit("s=")
>> sdp.text >> eol;
information_field %= -(lit("i=")
>> sdp.text >> eol);
uri_field %= -(lit("u=")
>> uri >> eol);
email_fields %= *(lit("e=")
>> email_address >> eol);
phone_fields %= *(lit("p=")
>> phone_number >> eol);
connection_field %= lit("c=")
>> nettype >> lit(' ')
>> addrtype >> lit(' ')
>> connection_address >> eol;
// a connection field must be present in every media
// description or at the session-level
bandwidth_fields %= *(lit("b=")
>> bwtype >> lit(':')
>> bandwidth >> eol);
time_fields %= +(lit("t=")
>> start_time >> lit(' ')
>> stop_time
/* >> *(eol >> repeat_fields)*/
>> eol)
/* >> -(zone_adjustments >> eol)*/;
repeat_fields %= lit("r=")
>> repeat_interval >> lit(' ')
>> typed_time >> +(lit(' ') >> typed_time);
zone_adjustments %= lit("z=")
>> ulong_long >> lit(' ')
>> long_long % lit(' ');
// TODO: parse typed-time
key_field %= -(lit("k=")
>> key_type >> eol);
attribute_fields %= *(lit("a=")
>> attribute >> eol);
media_descriptions %= *(media_field
// >> information_field
>> *connection_field
// >> bandwidth_fields
// >> key_field
>> attribute_fields);
media_field %= lit("m=")
>> media >> lit(' ')
>> port /*>> -(lit('/') >> sdp.integer)*/ >> lit(' ')
>> proto >> +(lit(' ') >> fmt) >> eol;
/* sub-rules of 'o=' */
username %= sdp.non_ws_string.alias();
// pretty wide definition, but doesn't include space
sess_id %= ulong_long;
// should be unique for this username/host
sess_version %= ulong_long;
nettype %= sdp.token.alias();
// typically "IN"
addrtype %= sdp.token.alias();
// typically "IP4" or "IP6"
/* sub-rules of 'u=' */
uri %= URI_reference; // see RFC 3986
/* sub-rules of 'e=', see RFC 2822 for definitions */
email_address %= dispname_and_address
| address_and_comment
| addr_spec;
address_and_comment %= addr_spec
>> +abnf.SP
>> char_('(')
>> +sdp.email_safe
>> char_(')');
dispname_and_address %= +sdp.email_safe
>> +abnf.SP
>> char_('<')
>> addr_spec
>> char_('>');
/* sub-rules of 'p=' */
phone_number %= (phone >> *abnf.SP >> char_('(')
>> +sdp.email_safe >> char_(')'))
| (+sdp.email_safe >> char_('<')
>> phone >> char_('>'))
| phone;
phone %= -char_('+') >> abnf.DIGIT
>> +(abnf.SP | char_('-') | abnf.DIGIT);
/* sub-rules of 'c=' */
connection_address %= sdp.unicast_address/*
| sdp.multicast_address*/;
/* sub-rules of 'b=' */
bwtype %= sdp.token.alias();
bandwidth %= ulong_long;
/* sub-rules of 't=' */
/* Decimal representation of NTP time in seconds since 1900. The
* representation of NTP time is an unbounded length field containing at
* least 10 digits. Unlike the 64-bit representation used elsewhere, time
* in SDP does not wrap in the year 2036. -- ANNOYING!
*/
start_time %= ulong_long;
stop_time %= ulong_long;
time %= ulong_long;
/* sub-rules of 'r=' and 'z=' */
repeat_interval %= ulong_long
>> -fixed_len_time_unit;
typed_time %= ulong_long
>> -fixed_len_time_unit;
fixed_len_time_unit %= char_('d')
| char_('h')
| char_('m')
| char_('s');
/* sub-rules of 'k=' */
key_type %= string("prompt")
| (string("clear:") >> sdp.text)
| (string("base64:") >> base64)
| (string("uri:") >> uri);
base64_char %= abnf.ALPHA
| abnf.DIGIT
| char_('+')
| char_('/');
base64_unit %= repeat(4)[base64_char];
base64_pad %= repeat(2)[base64_char] >> repeat(2)[char_('=')]
| repeat(3)[base64_char] >> char_('=');
base64 %= *base64_unit >> -base64_pad;
/* sub-rules of 'a=' */
attribute %= (att_field >> lit(':') >> att_value) | att_field;
att_field %= sdp.token.alias();
att_value %= sdp.byte_string.alias();
/* sub-rules of 'm=' */
media %= sdp.token.alias();
// typically "audio", "video", "text", or "application"
fmt %= sdp.token.alias();
// typically an RTP payload type for audio and video
// media
proto = sdp.token[_val += _1]
>> *(char_('/')[_val += _1] >> sdp.token[_val += _1]);
// typically "RTP/AVP" or "udp"
port %= ushort_;
/* naming */
session_description.name("session-description");
proto_version.name("proto-version");
origin_field.name("origin-field");
session_name_field.name("session-name-field");
information_field.name("information-field");
uri_field.name("uri-field");
email_fields.name("email-fields");
phone_fields.name("phone-fields");
connection_field.name("connection-field");
bandwidth_fields.name("bandwidth-fields");
time_fields.name("time-fields");
repeat_fields.name("repeat-fields");
zone_adjustments.name("zone-adjustments");
key_field.name("key-field");
attribute_fields.name("attribute-fields");
media_descriptions.name("media-descriptions");
media_field.name("media-field");
username.name("username");
sess_id.name("sess-id");
sess_version.name("sess-version");
nettype.name("nettype");
addrtype.name("addrtype");
uri.name("uri");
email_address.name("email-address");
address_and_comment.name("address-and-comment");
dispname_and_address.name("dispname-and-address");
phone_number.name("phone-number");
phone.name("phone");
connection_address.name("connection-address");
bwtype.name("bwtype");
bandwidth.name("bandwidth");
start_time.name("bandwidth");
stop_time.name("stop-time");
time.name("time");
repeat_interval.name("repeat-interval");
typed_time.name("typed-time");
fixed_len_time_unit.name("typed-time");
key_type.name("key-type");
base64_char.name("base64-char");
base64_unit.name("base64-unit");
base64_pad.name("base64-pad");
base64.name("base64");
attribute.name("attribute");
att_field.name("att-field");
att_value.name("att-value");
media.name("media");
fmt.name("media");
proto.name("proto");
port.name("port");
}