/* * SRT - Secure, Reliable, Transport * Copyright (c) 2018 Haivision Systems Inc. * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. * */ /***************************************************************************** Copyright (c) 2001 - 2011, The Board of Trustees of the University of Illinois. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the University of Illinois nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *****************************************************************************/ /***************************************************************************** written by Yunhong Gu, last updated 01/22/2011 modified by Haivision Systems Inc. *****************************************************************************/ #ifndef INC_SRT_LIST_H #define INC_SRT_LIST_H #include "udt.h" #include "common.h" class CSndLossList { public: CSndLossList(int size = 1024); ~CSndLossList(); /// Insert a seq. no. into the sender loss list. /// @param [in] seqno1 sequence number starts. /// @param [in] seqno2 sequence number ends. /// @return number of packets that are not in the list previously. int insert(int32_t seqno1, int32_t seqno2); /// Remove the given sequence number and all numbers that precede it. /// @param [in] seqno sequence number. void removeUpTo(int32_t seqno); /// Read the loss length.∏ /// @return The length of the list. int getLossLength() const; /// Read the first (smallest) loss seq. no. in the list and remove it. /// @return The seq. no. or -1 if the list is empty. int32_t popLostSeq(); void traceState() const; private: struct Seq { int32_t seqstart; // sequence number starts int32_t seqend; // sequence number ends int inext; // index of the next node in the list } * m_caSeq; int m_iHead; // first node int m_iLength; // loss length const int m_iSize; // size of the static array int m_iLastInsertPos; // position of last insert node mutable srt::sync::Mutex m_ListLock; // used to synchronize list operation private: /// Inserts an element to the beginning and updates head pointer. /// No lock. void insertHead(int pos, int32_t seqno1, int32_t seqno2); /// Inserts an element after previous element. /// No lock. void insertAfter(int pos, int pos_after, int32_t seqno1, int32_t seqno2); /// Check if it is possible to coalesce element at loc with further elements. /// @param loc - last changed location void coalesce(int loc); /// Update existing element with the new range (increase only) /// @param pos position of the element being updated /// @param seqno1 first sequence number in range /// @param seqno2 last sequence number in range (SRT_SEQNO_NONE if no range) bool updateElement(int pos, int32_t seqno1, int32_t seqno2); private: CSndLossList(const CSndLossList&); CSndLossList& operator=(const CSndLossList&); }; //////////////////////////////////////////////////////////////////////////////// class CRcvLossList { public: CRcvLossList(int size = 1024); ~CRcvLossList(); /// Insert a series of loss seq. no. between "seqno1" and "seqno2" into the receiver's loss list. /// @param [in] seqno1 sequence number starts. /// @param [in] seqno2 seqeunce number ends. void insert(int32_t seqno1, int32_t seqno2); /// Remove a loss seq. no. from the receiver's loss list. /// @param [in] seqno sequence number. /// @return if the packet is removed (true) or no such lost packet is found (false). bool remove(int32_t seqno); /// Remove all packets between seqno1 and seqno2. /// @param [in] seqno1 start sequence number. /// @param [in] seqno2 end sequence number. /// @return if the packet is removed (true) or no such lost packet is found (false). bool remove(int32_t seqno1, int32_t seqno2); /// Find if there is any lost packets whose sequence number falling seqno1 and seqno2. /// @param [in] seqno1 start sequence number. /// @param [in] seqno2 end sequence number. /// @return True if found; otherwise false. bool find(int32_t seqno1, int32_t seqno2) const; /// Read the loss length. /// @return the length of the list. int getLossLength() const; /// Read the first (smallest) seq. no. in the list. /// @return the sequence number or -1 if the list is empty. int32_t getFirstLostSeq() const; /// Get a encoded loss array for NAK report. /// @param [out] array the result list of seq. no. to be included in NAK. /// @param [out] len physical length of the result array. /// @param [in] limit maximum length of the array. void getLossArray(int32_t* array, int& len, int limit); private: struct Seq { int32_t seqstart; // sequence number starts int32_t seqend; // sequence number ends int inext; // index of the next node in the list int iprior; // index of the previous node in the list } * m_caSeq; int m_iHead; // first node in the list int m_iTail; // last node in the list; int m_iLength; // loss length int m_iSize; // size of the static array private: CRcvLossList(const CRcvLossList&); CRcvLossList& operator=(const CRcvLossList&); public: struct iterator { int32_t head; Seq* seq; iterator(Seq* str, int32_t v) : head(v) , seq(str) { } iterator next() const { if (head == -1) return *this; // should report error, but we can only throw exception, so simply ignore it. return iterator(seq, seq[head].inext); } iterator& operator++() { *this = next(); return *this; } iterator operator++(int) { iterator old(seq, head); *this = next(); return old; } bool operator==(const iterator& second) const { // Ignore seq - should be the same and this is only a sanity check. return head == second.head; } bool operator!=(const iterator& second) const { return !(*this == second); } std::pair operator*() { return std::make_pair(seq[head].seqstart, seq[head].seqend); } }; iterator begin() { return iterator(m_caSeq, m_iHead); } iterator end() { return iterator(m_caSeq, -1); } }; struct CRcvFreshLoss { int32_t seq[2]; int ttl; srt::sync::steady_clock::time_point timestamp; CRcvFreshLoss(int32_t seqlo, int32_t seqhi, int initial_ttl); // Don't WTF when looking at this. The Windows system headers define // a publicly visible preprocessor macro with that name. REALLY! #ifdef DELETE #undef DELETE #endif enum Emod { NONE, //< the given sequence was not found in this range STRIPPED, //< it was equal to first or last, already taken care of SPLIT, //< found in the middle, you have to split this range into two DELETE //< This was a range of one element exactly equal to sequence. Simply delete it. }; Emod revoke(int32_t sequence); Emod revoke(int32_t lo, int32_t hi); }; #endif