Keith Winstein
112 lines
3.2 KiB
C++
112 lines
3.2 KiB
C++
/*
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Mosh: the mobile shell
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Copyright 2012 Keith Winstein
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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 as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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In addition, as a special exception, the copyright holders give
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permission to link the code of portions of this program with the
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OpenSSL library under certain conditions as described in each
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individual source file, and distribute linked combinations including
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the two.
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You must obey the GNU General Public License in all respects for all
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of the code used other than OpenSSL. If you modify file(s) with this
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exception, you may extend this exception to your version of the
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file(s), but you are not obligated to do so. If you do not wish to do
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so, delete this exception statement from your version. If you delete
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this exception statement from all source files in the program, then
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also delete it here.
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*/
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#ifndef TRANSPORT_FRAGMENT_HPP
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#define TRANSPORT_FRAGMENT_HPP
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#include <stdint.h>
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#include <vector>
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#include <string>
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#include "transportinstruction.pb.h"
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using std::vector;
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using std::string;
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using namespace TransportBuffers;
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namespace Network {
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static const int HEADER_LEN = 66;
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class Fragment
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{
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private:
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static const size_t frag_header_len = sizeof( uint64_t ) + sizeof( uint16_t );
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public:
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uint64_t id;
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uint16_t fragment_num;
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bool final;
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bool initialized;
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string contents;
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Fragment()
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: id( -1 ), fragment_num( -1 ), final( false ), initialized( false ), contents()
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{}
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Fragment( uint64_t s_id, uint16_t s_fragment_num, bool s_final, string s_contents )
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: id( s_id ), fragment_num( s_fragment_num ), final( s_final ), initialized( true ),
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contents( s_contents )
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{}
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Fragment( string &x );
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string tostring( void );
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bool operator==( const Fragment &x );
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};
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class FragmentAssembly
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{
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private:
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vector<Fragment> fragments;
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uint64_t current_id;
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int fragments_arrived, fragments_total;
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public:
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FragmentAssembly() : fragments(), current_id( -1 ), fragments_arrived( 0 ), fragments_total( -1 ) {}
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bool add_fragment( Fragment &inst );
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Instruction get_assembly( void );
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};
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class Fragmenter
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{
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private:
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uint64_t next_instruction_id;
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Instruction last_instruction;
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int last_MTU;
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public:
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Fragmenter() : next_instruction_id( 0 ), last_instruction(), last_MTU( -1 )
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{
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last_instruction.set_old_num( -1 );
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last_instruction.set_new_num( -1 );
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}
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vector<Fragment> make_fragments( const Instruction &inst, int MTU );
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uint64_t last_ack_sent( void ) const { return last_instruction.ack_num(); }
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};
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}
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#endif
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