NS-3 based Named Data Networking (NDN) simulator
ndnSIM: NDN, CCN, CCNx, content centric networks
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dtag.cc
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/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2011 University of California, Los Angeles
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
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*/
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#include "dtag.h"
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#include "base-attr.h"
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#include "base-tag.h"
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NDN_NAMESPACE_BEGIN
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namespace
wire {
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namespace
CcnbParser {
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Dtag::Dtag (Buffer::Iterator &start, uint32_t dtag)
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{
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m_dtag = dtag;
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// std::cout << m_dtag << ", position: " << Block::counter << "\n";
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if
(dtag == CCN_DTAG_Content)
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{
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Block::ParseBlock (start,
true
);
// process length field and ignore it
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return
;
// hack #1. Do not process nesting block for <Content>
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}
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// parse attributes until first nested block reached
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while
(!start.IsEnd () && BufferIteratorPeekU8 (start)!=CCN_CLOSE)
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{
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Ptr<Block> block = Block::ParseBlock (start);
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if
(DynamicCast<BaseAttr> (block)!=0)
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m_attrs.push_back (block);
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else
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{
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m_nestedTags.push_back (block);
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break
;
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}
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}
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// parse the rest of nested blocks
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while
(!start.IsEnd () && BufferIteratorPeekU8 (start)!=CCN_CLOSE)
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{
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// hack #2. Stop processing nested blocks if last block was <Content>
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if
(m_dtag == CCN_DTAG_Data &&
// we are in <Data>
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DynamicCast<Dtag> (m_nestedTags.back())!=0 &&
// last block is DTAG
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DynamicCast<Dtag> (m_nestedTags.back())->m_dtag == CCN_DTAG_Content)
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{
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return
;
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}
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m_nestedTags.push_back (Block::ParseBlock (start));
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}
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// hack #3. Stop processing when last tag was <Data>
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if
(m_dtag == CCN_DTAG_Data &&
// we are in <Data>
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DynamicCast<Dtag> (m_nestedTags.back())!=0 &&
// last block is DTAG
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DynamicCast<Dtag> (m_nestedTags.back())->m_dtag == CCN_DTAG_Content)
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{
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return
;
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}
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if
(start.IsEnd ())
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throw
CcnbDecodingException
();
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start.ReadU8 ();
// read CCN_CLOSE
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// std::cout << "closer, position = " << Block::counter << "\n";
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// Block::counter ++;
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}
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}
// namespace CcnbParser
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}
// namespace wire
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NDN_NAMESPACE_END
ns3::ndn::wire::CcnbParser::CcnbDecodingException
Exception thrown if there is a parsing error.
Definition:
common.h:50
ndnSIM
model
wire
ccnb
ccnb-parser
syntax-tree
dtag.cc
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