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reliable.c
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reliable.c
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/*
reliable.io
Copyright © 2017 - 2019, The Network Protocol Company, Inc.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. 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.
3. Neither the name of the copyright holder 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 HOLDER 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.
*/
#include "reliable.h"
#include <stdlib.h>
#include <memory.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <inttypes.h>
#include <float.h>
#include <math.h>
#ifndef RELIABLE_ENABLE_TESTS
#define RELIABLE_ENABLE_TESTS 0
#endif // #ifndef RELIABLE_ENABLE_TESTS
#ifndef RELIABLE_ENABLE_LOGGING
#define RELIABLE_ENABLE_LOGGING 1
#endif // #ifndef RELIABLE_ENABLE_LOGGING
// ------------------------------------------------------------------
static void default_assert_handler( RELIABLE_CONST char * condition, RELIABLE_CONST char * function, RELIABLE_CONST char * file, int line )
{
printf( "assert failed: ( %s ), function %s, file %s, line %d\n", condition, function, file, line );
#if defined( __GNUC__ )
__builtin_trap();
#elif defined( _MSC_VER )
__debugbreak();
#endif
exit( 1 );
}
static int log_level = 0;
static int (*printf_function)( RELIABLE_CONST char *, ... ) = ( int (*)( RELIABLE_CONST char *, ... ) ) printf;
void (*reliable_assert_function)( RELIABLE_CONST char *, RELIABLE_CONST char *, RELIABLE_CONST char * file, int line ) = default_assert_handler;
void reliable_log_level( int level )
{
log_level = level;
}
void reliable_set_printf_function( int (*function)( RELIABLE_CONST char *, ... ) )
{
reliable_assert( function );
printf_function = function;
}
void reliable_set_assert_function( void (*function)( RELIABLE_CONST char *, RELIABLE_CONST char *, RELIABLE_CONST char * file, int line ) )
{
reliable_assert_function = function;
}
#if RELIABLE_ENABLE_LOGGING
void reliable_printf( int level, RELIABLE_CONST char * format, ... )
{
if ( level > log_level )
return;
va_list args;
va_start( args, format );
char buffer[4*1024];
vsnprintf( buffer, sizeof(buffer), format, args );
printf_function( "%s", buffer );
va_end( args );
}
#else // #if RELIABLE_ENABLE_LOGGING
void reliable_printf( int level, RELIABLE_CONST char * format, ... )
{
(void) level;
(void) format;
}
#endif // #if RELIABLE_ENABLE_LOGGING
void * reliable_default_allocate_function( void * context, uint64_t bytes )
{
(void) context;
return malloc( bytes );
}
void reliable_default_free_function( void * context, void * pointer )
{
(void) context;
free( pointer );
}
// ------------------------------------------------------------------
int reliable_init(void)
{
return RELIABLE_OK;
}
void reliable_term(void)
{
}
// ---------------------------------------------------------------
int reliable_sequence_greater_than( uint16_t s1, uint16_t s2 )
{
return ( ( s1 > s2 ) && ( s1 - s2 <= 32768 ) ) ||
( ( s1 < s2 ) && ( s2 - s1 > 32768 ) );
}
int reliable_sequence_less_than( uint16_t s1, uint16_t s2 )
{
return reliable_sequence_greater_than( s2, s1 );
}
// ---------------------------------------------------------------
struct reliable_sequence_buffer_t
{
void * allocator_context;
void * (*allocate_function)(void*,uint64_t);
void (*free_function)(void*,void*);
uint16_t sequence;
int num_entries;
int entry_stride;
uint32_t * entry_sequence;
uint8_t * entry_data;
};
struct reliable_sequence_buffer_t * reliable_sequence_buffer_create( int num_entries,
int entry_stride,
void * allocator_context,
void * (*allocate_function)(void*,uint64_t),
void (*free_function)(void*,void*) )
{
reliable_assert( num_entries > 0 );
reliable_assert( entry_stride > 0 );
if ( allocate_function == NULL )
{
allocate_function = reliable_default_allocate_function;
}
if ( free_function == NULL )
{
free_function = reliable_default_free_function;
}
struct reliable_sequence_buffer_t * sequence_buffer = (struct reliable_sequence_buffer_t*)
allocate_function( allocator_context, sizeof( struct reliable_sequence_buffer_t ) );
sequence_buffer->allocator_context = allocator_context;
sequence_buffer->allocate_function = allocate_function;
sequence_buffer->free_function = free_function;
sequence_buffer->sequence = 0;
sequence_buffer->num_entries = num_entries;
sequence_buffer->entry_stride = entry_stride;
sequence_buffer->entry_sequence = (uint32_t*) allocate_function( allocator_context, num_entries * sizeof( uint32_t ) );
sequence_buffer->entry_data = (uint8_t*) allocate_function( allocator_context, num_entries * entry_stride );
reliable_assert( sequence_buffer->entry_sequence );
reliable_assert( sequence_buffer->entry_data );
memset( sequence_buffer->entry_sequence, 0xFF, sizeof( uint32_t) * sequence_buffer->num_entries );
memset( sequence_buffer->entry_data, 0, num_entries * entry_stride );
return sequence_buffer;
}
void reliable_sequence_buffer_destroy( struct reliable_sequence_buffer_t * sequence_buffer )
{
reliable_assert( sequence_buffer );
sequence_buffer->free_function( sequence_buffer->allocator_context, sequence_buffer->entry_sequence );
sequence_buffer->free_function( sequence_buffer->allocator_context, sequence_buffer->entry_data );
sequence_buffer->free_function( sequence_buffer->allocator_context, sequence_buffer );
}
void reliable_sequence_buffer_reset( struct reliable_sequence_buffer_t * sequence_buffer )
{
reliable_assert( sequence_buffer );
sequence_buffer->sequence = 0;
memset( sequence_buffer->entry_sequence, 0xFF, sizeof( uint32_t) * sequence_buffer->num_entries );
}
void reliable_sequence_buffer_remove_entries( struct reliable_sequence_buffer_t * sequence_buffer,
int start_sequence,
int finish_sequence,
void (*cleanup_function)(void*,void*,void(*free_function)(void*,void*)) )
{
reliable_assert( sequence_buffer );
if ( finish_sequence < start_sequence )
{
finish_sequence += 65536;
}
if ( finish_sequence - start_sequence < sequence_buffer->num_entries )
{
int sequence;
for ( sequence = start_sequence; sequence <= finish_sequence; ++sequence )
{
if ( cleanup_function )
{
cleanup_function( sequence_buffer->entry_data + sequence_buffer->entry_stride * ( sequence % sequence_buffer->num_entries ),
sequence_buffer->allocator_context,
sequence_buffer->free_function );
}
sequence_buffer->entry_sequence[ sequence % sequence_buffer->num_entries ] = 0xFFFFFFFF;
}
}
else
{
int i;
for ( i = 0; i < sequence_buffer->num_entries; ++i )
{
if ( cleanup_function )
{
cleanup_function( sequence_buffer->entry_data + sequence_buffer->entry_stride * i,
sequence_buffer->allocator_context,
sequence_buffer->free_function );
}
sequence_buffer->entry_sequence[i] = 0xFFFFFFFF;
}
}
}
int reliable_sequence_buffer_test_insert( struct reliable_sequence_buffer_t * sequence_buffer, uint16_t sequence )
{
return reliable_sequence_less_than( sequence, sequence_buffer->sequence - ((uint16_t)sequence_buffer->num_entries) ) ? ((uint16_t)0) : ((uint16_t)1);
}
void * reliable_sequence_buffer_insert( struct reliable_sequence_buffer_t * sequence_buffer, uint16_t sequence )
{
reliable_assert( sequence_buffer );
if ( reliable_sequence_less_than( sequence, sequence_buffer->sequence - ((uint16_t)sequence_buffer->num_entries) ) )
{
return NULL;
}
if ( reliable_sequence_greater_than( sequence + 1, sequence_buffer->sequence ) )
{
reliable_sequence_buffer_remove_entries( sequence_buffer, sequence_buffer->sequence, sequence, NULL );
sequence_buffer->sequence = sequence + 1;
}
int index = sequence % sequence_buffer->num_entries;
sequence_buffer->entry_sequence[index] = sequence;
return sequence_buffer->entry_data + index * sequence_buffer->entry_stride;
}
void reliable_sequence_buffer_advance( struct reliable_sequence_buffer_t * sequence_buffer, uint16_t sequence )
{
reliable_assert( sequence_buffer );
if ( reliable_sequence_greater_than( sequence + 1, sequence_buffer->sequence ) )
{
reliable_sequence_buffer_remove_entries( sequence_buffer, sequence_buffer->sequence, sequence, NULL );
sequence_buffer->sequence = sequence + 1;
}
}
void * reliable_sequence_buffer_insert_with_cleanup( struct reliable_sequence_buffer_t * sequence_buffer,
uint16_t sequence,
void (*cleanup_function)(void*,void*,void(*free_function)(void*,void*)) )
{
reliable_assert( sequence_buffer );
if ( reliable_sequence_greater_than( sequence + 1, sequence_buffer->sequence ) )
{
reliable_sequence_buffer_remove_entries( sequence_buffer, sequence_buffer->sequence, sequence, cleanup_function );
sequence_buffer->sequence = sequence + 1;
}
else if ( reliable_sequence_less_than( sequence, sequence_buffer->sequence - ((uint16_t)sequence_buffer->num_entries) ) )
{
return NULL;
}
int index = sequence % sequence_buffer->num_entries;
if ( sequence_buffer->entry_sequence[index] != 0xFFFFFFFF )
{
cleanup_function( sequence_buffer->entry_data + sequence_buffer->entry_stride * ( sequence % sequence_buffer->num_entries ),
sequence_buffer->allocator_context,
sequence_buffer->free_function );
}
sequence_buffer->entry_sequence[index] = sequence;
return sequence_buffer->entry_data + index * sequence_buffer->entry_stride;
}
void reliable_sequence_buffer_advance_with_cleanup( struct reliable_sequence_buffer_t * sequence_buffer,
uint16_t sequence,
void (*cleanup_function)(void*,void*,void(*free_function)(void*,void*)) )
{
reliable_assert( sequence_buffer );
if ( reliable_sequence_greater_than( sequence + 1, sequence_buffer->sequence ) )
{
reliable_sequence_buffer_remove_entries( sequence_buffer, sequence_buffer->sequence, sequence, cleanup_function );
sequence_buffer->sequence = sequence + 1;
}
}
void reliable_sequence_buffer_remove( struct reliable_sequence_buffer_t * sequence_buffer, uint16_t sequence )
{
reliable_assert( sequence_buffer );
sequence_buffer->entry_sequence[ sequence % sequence_buffer->num_entries ] = 0xFFFFFFFF;
}
void reliable_sequence_buffer_remove_with_cleanup( struct reliable_sequence_buffer_t * sequence_buffer,
uint16_t sequence,
void (*cleanup_function)(void*,void*,void(*free_function)(void*,void*)) )
{
reliable_assert( sequence_buffer );
int index = sequence % sequence_buffer->num_entries;
if ( sequence_buffer->entry_sequence[index] != 0xFFFFFFFF )
{
sequence_buffer->entry_sequence[index] = 0xFFFFFFFF;
cleanup_function( sequence_buffer->entry_data + sequence_buffer->entry_stride * index, sequence_buffer->allocator_context, sequence_buffer->free_function );
}
}
int reliable_sequence_buffer_available( struct reliable_sequence_buffer_t * sequence_buffer, uint16_t sequence )
{
reliable_assert( sequence_buffer );
return sequence_buffer->entry_sequence[ sequence % sequence_buffer->num_entries ] == 0xFFFFFFFF;
}
int reliable_sequence_buffer_exists( struct reliable_sequence_buffer_t * sequence_buffer, uint16_t sequence )
{
reliable_assert( sequence_buffer );
return sequence_buffer->entry_sequence[ sequence % sequence_buffer->num_entries ] == (uint32_t) sequence;
}
void * reliable_sequence_buffer_find( struct reliable_sequence_buffer_t * sequence_buffer, uint16_t sequence )
{
reliable_assert( sequence_buffer );
int index = sequence % sequence_buffer->num_entries;
return ( ( sequence_buffer->entry_sequence[index] == (uint32_t) sequence ) ) ? ( sequence_buffer->entry_data + index * sequence_buffer->entry_stride ) : NULL;
}
void * reliable_sequence_buffer_at_index( struct reliable_sequence_buffer_t * sequence_buffer, int index )
{
reliable_assert( sequence_buffer );
reliable_assert( index >= 0 );
reliable_assert( index < sequence_buffer->num_entries );
return sequence_buffer->entry_sequence[index] != 0xFFFFFFFF ? ( sequence_buffer->entry_data + index * sequence_buffer->entry_stride ) : NULL;
}
void reliable_sequence_buffer_generate_ack_bits( struct reliable_sequence_buffer_t * sequence_buffer, uint16_t * ack, uint32_t * ack_bits )
{
reliable_assert( sequence_buffer );
reliable_assert( ack );
reliable_assert( ack_bits );
*ack = sequence_buffer->sequence - 1;
*ack_bits = 0;
uint32_t mask = 1;
int i;
for ( i = 0; i < 32; ++i )
{
uint16_t sequence = *ack - ((uint16_t)i);
if ( reliable_sequence_buffer_exists( sequence_buffer, sequence ) )
*ack_bits |= mask;
mask <<= 1;
}
}
// ---------------------------------------------------------------
void reliable_write_uint8( uint8_t ** p, uint8_t value )
{
**p = value;
++(*p);
}
void reliable_write_uint16( uint8_t ** p, uint16_t value )
{
(*p)[0] = value & 0xFF;
(*p)[1] = value >> 8;
*p += 2;
}
void reliable_write_uint32( uint8_t ** p, uint32_t value )
{
(*p)[0] = value & 0xFF;
(*p)[1] = ( value >> 8 ) & 0xFF;
(*p)[2] = ( value >> 16 ) & 0xFF;
(*p)[3] = value >> 24;
*p += 4;
}
void reliable_write_uint64( uint8_t ** p, uint64_t value )
{
(*p)[0] = value & 0xFF;
(*p)[1] = ( value >> 8 ) & 0xFF;
(*p)[2] = ( value >> 16 ) & 0xFF;
(*p)[3] = ( value >> 24 ) & 0xFF;
(*p)[4] = ( value >> 32 ) & 0xFF;
(*p)[5] = ( value >> 40 ) & 0xFF;
(*p)[6] = ( value >> 48 ) & 0xFF;
(*p)[7] = value >> 56;
*p += 8;
}
void reliable_write_bytes( uint8_t ** p, uint8_t * byte_array, int num_bytes )
{
int i;
for ( i = 0; i < num_bytes; ++i )
{
reliable_write_uint8( p, byte_array[i] );
}
}
uint8_t reliable_read_uint8( uint8_t ** p )
{
uint8_t value = **p;
++(*p);
return value;
}
uint16_t reliable_read_uint16( uint8_t ** p )
{
uint16_t value;
value = (*p)[0];
value |= ( ( (uint16_t)( (*p)[1] ) ) << 8 );
*p += 2;
return value;
}
uint32_t reliable_read_uint32( uint8_t ** p )
{
uint32_t value;
value = (*p)[0];
value |= ( ( (uint32_t)( (*p)[1] ) ) << 8 );
value |= ( ( (uint32_t)( (*p)[2] ) ) << 16 );
value |= ( ( (uint32_t)( (*p)[3] ) ) << 24 );
*p += 4;
return value;
}
uint64_t reliable_read_uint64( uint8_t ** p )
{
uint64_t value;
value = (*p)[0];
value |= ( ( (uint64_t)( (*p)[1] ) ) << 8 );
value |= ( ( (uint64_t)( (*p)[2] ) ) << 16 );
value |= ( ( (uint64_t)( (*p)[3] ) ) << 24 );
value |= ( ( (uint64_t)( (*p)[4] ) ) << 32 );
value |= ( ( (uint64_t)( (*p)[5] ) ) << 40 );
value |= ( ( (uint64_t)( (*p)[6] ) ) << 48 );
value |= ( ( (uint64_t)( (*p)[7] ) ) << 56 );
*p += 8;
return value;
}
void reliable_read_bytes( uint8_t ** p, uint8_t * byte_array, int num_bytes )
{
int i;
for ( i = 0; i < num_bytes; ++i )
{
byte_array[i] = reliable_read_uint8( p );
}
}
// ---------------------------------------------------------------
struct reliable_fragment_reassembly_data_t
{
uint16_t sequence;
uint16_t ack;
uint32_t ack_bits;
int num_fragments_received;
int num_fragments_total;
uint8_t * packet_data;
int packet_bytes;
int packet_header_bytes;
uint8_t fragment_received[256];
};
void reliable_fragment_reassembly_data_cleanup( void * data, void * allocator_context, void (*free_function)(void*,void*) )
{
reliable_assert( free_function );
struct reliable_fragment_reassembly_data_t * reassembly_data = (struct reliable_fragment_reassembly_data_t*) data;
if ( reassembly_data->packet_data )
{
free_function( allocator_context, reassembly_data->packet_data );
reassembly_data->packet_data = NULL;
}
}
// ---------------------------------------------------------------
struct reliable_endpoint_t
{
void * allocator_context;
void * (*allocate_function)(void*,uint64_t);
void (*free_function)(void*,void*);
struct reliable_config_t config;
double time;
float rtt;
float packet_loss;
float sent_bandwidth_kbps;
float received_bandwidth_kbps;
float acked_bandwidth_kbps;
int num_acks;
uint16_t * acks;
uint16_t sequence;
struct reliable_sequence_buffer_t * sent_packets;
struct reliable_sequence_buffer_t * received_packets;
struct reliable_sequence_buffer_t * fragment_reassembly;
uint64_t counters[RELIABLE_ENDPOINT_NUM_COUNTERS];
};
struct reliable_sent_packet_data_t
{
double time;
uint32_t acked : 1;
uint32_t packet_bytes : 31;
};
struct reliable_received_packet_data_t
{
double time;
uint32_t packet_bytes;
};
void reliable_default_config( struct reliable_config_t * config )
{
reliable_assert( config );
memset( config, 0, sizeof( struct reliable_config_t ) );
config->name[0] = 'e';
config->name[1] = 'n';
config->name[2] = 'd';
config->name[3] = 'p';
config->name[4] = 'o';
config->name[5] = 'i';
config->name[6] = 'n';
config->name[7] = 't';
config->name[8] = '\0';
config->max_packet_size = 16 * 1024;
config->fragment_above = 1024;
config->max_fragments = 16;
config->fragment_size = 1024;
config->ack_buffer_size = 256;
config->sent_packets_buffer_size = 256;
config->received_packets_buffer_size = 256;
config->fragment_reassembly_buffer_size = 64;
config->rtt_smoothing_factor = 0.0025f;
config->packet_loss_smoothing_factor = 0.1f;
config->bandwidth_smoothing_factor = 0.1f;
config->packet_header_size = 28; // note: UDP over IPv4 = 20 + 8 bytes, UDP over IPv6 = 40 + 8 bytes
}
struct reliable_endpoint_t * reliable_endpoint_create( struct reliable_config_t * config, double time )
{
reliable_assert( config );
reliable_assert( config->max_packet_size > 0 );
reliable_assert( config->fragment_above > 0 );
reliable_assert( config->max_fragments > 0 );
reliable_assert( config->max_fragments <= 256 );
reliable_assert( config->fragment_size > 0 );
reliable_assert( config->ack_buffer_size > 0 );
reliable_assert( config->sent_packets_buffer_size > 0 );
reliable_assert( config->received_packets_buffer_size > 0 );
reliable_assert( config->transmit_packet_function != NULL );
reliable_assert( config->process_packet_function != NULL );
void * allocator_context = config->allocator_context;
void * (*allocate_function)(void*,uint64_t) = config->allocate_function;
void (*free_function)(void*,void*) = config->free_function;
if ( allocate_function == NULL )
{
allocate_function = reliable_default_allocate_function;
}
if ( free_function == NULL )
{
free_function = reliable_default_free_function;
}
struct reliable_endpoint_t * endpoint = (struct reliable_endpoint_t*) allocate_function( allocator_context, sizeof( struct reliable_endpoint_t ) );
reliable_assert( endpoint );
memset( endpoint, 0, sizeof( struct reliable_endpoint_t ) );
endpoint->allocator_context = allocator_context;
endpoint->allocate_function = allocate_function;
endpoint->free_function = free_function;
endpoint->config = *config;
endpoint->time = time;
endpoint->acks = (uint16_t*) allocate_function( allocator_context, config->ack_buffer_size * sizeof( uint16_t ) );
endpoint->sent_packets = reliable_sequence_buffer_create( config->sent_packets_buffer_size,
sizeof( struct reliable_sent_packet_data_t ),
allocator_context,
allocate_function,
free_function );
endpoint->received_packets = reliable_sequence_buffer_create( config->received_packets_buffer_size,
sizeof( struct reliable_received_packet_data_t ),
allocator_context,
allocate_function,
free_function );
endpoint->fragment_reassembly = reliable_sequence_buffer_create( config->fragment_reassembly_buffer_size,
sizeof( struct reliable_fragment_reassembly_data_t ),
allocator_context,
allocate_function,
free_function );
memset( endpoint->acks, 0, config->ack_buffer_size * sizeof( uint16_t ) );
return endpoint;
}
void reliable_endpoint_destroy( struct reliable_endpoint_t * endpoint )
{
reliable_assert( endpoint );
reliable_assert( endpoint->acks );
reliable_assert( endpoint->sent_packets );
reliable_assert( endpoint->received_packets );
int i;
for ( i = 0; i < endpoint->config.fragment_reassembly_buffer_size; ++i )
{
struct reliable_fragment_reassembly_data_t * reassembly_data = (struct reliable_fragment_reassembly_data_t*)
reliable_sequence_buffer_at_index( endpoint->fragment_reassembly, i );
if ( reassembly_data && reassembly_data->packet_data )
{
endpoint->free_function( endpoint->allocator_context, reassembly_data->packet_data );
reassembly_data->packet_data = NULL;
}
}
endpoint->free_function( endpoint->allocator_context, endpoint->acks );
reliable_sequence_buffer_destroy( endpoint->sent_packets );
reliable_sequence_buffer_destroy( endpoint->received_packets );
reliable_sequence_buffer_destroy( endpoint->fragment_reassembly );
endpoint->free_function( endpoint->allocator_context, endpoint );
}
uint16_t reliable_endpoint_next_packet_sequence( struct reliable_endpoint_t * endpoint )
{
reliable_assert( endpoint );
return endpoint->sequence;
}
int reliable_write_packet_header( uint8_t * packet_data, uint16_t sequence, uint16_t ack, uint32_t ack_bits )
{
uint8_t * p = packet_data;
uint8_t prefix_byte = 0;
if ( ( ack_bits & 0x000000FF ) != 0x000000FF )
{
prefix_byte |= (1<<1);
}
if ( ( ack_bits & 0x0000FF00 ) != 0x0000FF00 )
{
prefix_byte |= (1<<2);
}
if ( ( ack_bits & 0x00FF0000 ) != 0x00FF0000 )
{
prefix_byte |= (1<<3);
}
if ( ( ack_bits & 0xFF000000 ) != 0xFF000000 )
{
prefix_byte |= (1<<4);
}
int sequence_difference = sequence - ack;
if ( sequence_difference < 0 )
sequence_difference += 65536;
if ( sequence_difference <= 255 )
prefix_byte |= (1<<5);
reliable_write_uint8( &p, prefix_byte );
reliable_write_uint16( &p, sequence );
if ( sequence_difference <= 255 )
{
reliable_write_uint8( &p, (uint8_t) sequence_difference );
}
else
{
reliable_write_uint16( &p, ack );
}
if ( ( ack_bits & 0x000000FF ) != 0x000000FF )
{
reliable_write_uint8( &p, (uint8_t) ( ack_bits & 0x000000FF ) );
}
if ( ( ack_bits & 0x0000FF00 ) != 0x0000FF00 )
{
reliable_write_uint8( &p, (uint8_t) ( ( ack_bits & 0x0000FF00 ) >> 8 ) );
}
if ( ( ack_bits & 0x00FF0000 ) != 0x00FF0000 )
{
reliable_write_uint8( &p, (uint8_t) ( ( ack_bits & 0x00FF0000 ) >> 16 ) );
}
if ( ( ack_bits & 0xFF000000 ) != 0xFF000000 )
{
reliable_write_uint8( &p, (uint8_t) ( ( ack_bits & 0xFF000000 ) >> 24 ) );
}
reliable_assert( p - packet_data <= RELIABLE_MAX_PACKET_HEADER_BYTES );
return (int) ( p - packet_data );
}
void reliable_endpoint_send_packet( struct reliable_endpoint_t * endpoint, uint8_t * packet_data, int packet_bytes )
{
reliable_assert( endpoint );
reliable_assert( packet_data );
reliable_assert( packet_bytes > 0 );
if ( packet_bytes > endpoint->config.max_packet_size )
{
reliable_printf( RELIABLE_LOG_LEVEL_ERROR, "[%s] packet too large to send. packet is %d bytes, maximum is %d\n",
endpoint->config.name, packet_bytes, endpoint->config.max_packet_size );
endpoint->counters[RELIABLE_ENDPOINT_COUNTER_NUM_PACKETS_TOO_LARGE_TO_SEND]++;
return;
}
uint16_t sequence = endpoint->sequence++;
uint16_t ack;
uint32_t ack_bits;
reliable_sequence_buffer_generate_ack_bits( endpoint->received_packets, &ack, &ack_bits );
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] sending packet %d\n", endpoint->config.name, sequence );
struct reliable_sent_packet_data_t * sent_packet_data = (struct reliable_sent_packet_data_t*) reliable_sequence_buffer_insert( endpoint->sent_packets, sequence );
reliable_assert( sent_packet_data );
sent_packet_data->time = endpoint->time;
sent_packet_data->packet_bytes = endpoint->config.packet_header_size + packet_bytes;
sent_packet_data->acked = 0;
if ( packet_bytes <= endpoint->config.fragment_above )
{
// regular packet
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] sending packet %d without fragmentation\n", endpoint->config.name, sequence );
uint8_t * transmit_packet_data = (uint8_t*) endpoint->allocate_function( endpoint->allocator_context, packet_bytes + RELIABLE_MAX_PACKET_HEADER_BYTES );
int packet_header_bytes = reliable_write_packet_header( transmit_packet_data, sequence, ack, ack_bits );
memcpy( transmit_packet_data + packet_header_bytes, packet_data, packet_bytes );
endpoint->config.transmit_packet_function( endpoint->config.context, endpoint->config.index, sequence, transmit_packet_data, packet_header_bytes + packet_bytes );
endpoint->free_function( endpoint->allocator_context, transmit_packet_data );
}
else
{
// fragmented packet
uint8_t packet_header[RELIABLE_MAX_PACKET_HEADER_BYTES];
memset( packet_header, 0, RELIABLE_MAX_PACKET_HEADER_BYTES );
int packet_header_bytes = reliable_write_packet_header( packet_header, sequence, ack, ack_bits );
int num_fragments = ( packet_bytes / endpoint->config.fragment_size ) + ( ( packet_bytes % endpoint->config.fragment_size ) != 0 ? 1 : 0 );
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] sending packet %d as %d fragments\n", endpoint->config.name, sequence, num_fragments );
reliable_assert( num_fragments >= 1 );
reliable_assert( num_fragments <= endpoint->config.max_fragments );
int fragment_buffer_size = RELIABLE_FRAGMENT_HEADER_BYTES + RELIABLE_MAX_PACKET_HEADER_BYTES + endpoint->config.fragment_size;
uint8_t * fragment_packet_data = (uint8_t*) endpoint->allocate_function( endpoint->allocator_context, fragment_buffer_size );
uint8_t * q = packet_data;
uint8_t * end = q + packet_bytes;
int fragment_id;
for ( fragment_id = 0; fragment_id < num_fragments; ++fragment_id )
{
uint8_t * p = fragment_packet_data;
reliable_write_uint8( &p, 1 );
reliable_write_uint16( &p, sequence );
reliable_write_uint8( &p, (uint8_t) fragment_id );
reliable_write_uint8( &p, (uint8_t) ( num_fragments - 1 ) );
if ( fragment_id == 0 )
{
memcpy( p, packet_header, packet_header_bytes );
p += packet_header_bytes;
}
int bytes_to_copy = endpoint->config.fragment_size;
if ( q + bytes_to_copy > end )
{
bytes_to_copy = (int) ( end - q );
}
memcpy( p, q, bytes_to_copy );
p += bytes_to_copy;
q += bytes_to_copy;
int fragment_packet_bytes = (int) ( p - fragment_packet_data );
endpoint->config.transmit_packet_function( endpoint->config.context, endpoint->config.index, sequence, fragment_packet_data, fragment_packet_bytes );
endpoint->counters[RELIABLE_ENDPOINT_COUNTER_NUM_FRAGMENTS_SENT]++;
}
endpoint->free_function( endpoint->allocator_context, fragment_packet_data );
}
endpoint->counters[RELIABLE_ENDPOINT_COUNTER_NUM_PACKETS_SENT]++;
}
int reliable_read_packet_header( RELIABLE_CONST char * name, uint8_t * packet_data, int packet_bytes, uint16_t * sequence, uint16_t * ack, uint32_t * ack_bits )
{
if ( packet_bytes < 3 )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] packet too small for packet header (1)\n", name );
return -1;
}
uint8_t * p = packet_data;
uint8_t prefix_byte = reliable_read_uint8( &p );
if ( ( prefix_byte & 1 ) != 0 )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] prefix byte does not indicate a regular packet\n", name );
return -1;
}
*sequence = reliable_read_uint16( &p );
if ( prefix_byte & (1<<5) )
{
if ( packet_bytes < 3 + 1 )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] packet too small for packet header (2)\n", name );
return -1;
}
uint8_t sequence_difference = reliable_read_uint8( &p );
*ack = *sequence - sequence_difference;
}
else
{
if ( packet_bytes < 3 + 2 )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] packet too small for packet header (3)\n", name );
return -1;
}
*ack = reliable_read_uint16( &p );
}
int expected_bytes = 0;
int i;
for ( i = 1; i <= 4; ++i )
{
if ( prefix_byte & (1<<i) )
{
expected_bytes++;
}
}
if ( packet_bytes < ( p - packet_data ) + expected_bytes )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] packet too small for packet header (4)\n", name );
return -1;
}
*ack_bits = 0xFFFFFFFF;
if ( prefix_byte & (1<<1) )
{
*ack_bits &= 0xFFFFFF00;
*ack_bits |= (uint32_t) ( reliable_read_uint8( &p ) );
}
if ( prefix_byte & (1<<2) )
{
*ack_bits &= 0xFFFF00FF;
*ack_bits |= (uint32_t) ( reliable_read_uint8( &p ) ) << 8;
}
if ( prefix_byte & (1<<3) )
{
*ack_bits &= 0xFF00FFFF;
*ack_bits |= (uint32_t) ( reliable_read_uint8( &p ) ) << 16;
}
if ( prefix_byte & (1<<4) )
{
*ack_bits &= 0x00FFFFFF;
*ack_bits |= (uint32_t) ( reliable_read_uint8( &p ) ) << 24;
}
return (int) ( p - packet_data );
}
int reliable_read_fragment_header( char * name,
uint8_t * packet_data,
int packet_bytes,
int max_fragments,
int fragment_size,
int * fragment_id,
int * num_fragments,
int * fragment_bytes,
uint16_t * sequence,
uint16_t * ack,
uint32_t * ack_bits )
{
if ( packet_bytes < RELIABLE_FRAGMENT_HEADER_BYTES )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] packet is too small to read fragment header\n", name );
return -1;
}
uint8_t * p = packet_data;
uint8_t prefix_byte = reliable_read_uint8( &p );
if ( prefix_byte != 1 )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] prefix byte is not a fragment\n", name );
return -1;
}
*sequence = reliable_read_uint16( &p );
*fragment_id = (int) reliable_read_uint8( &p );
*num_fragments = ( (int) reliable_read_uint8( &p ) ) + 1;
if ( *num_fragments > max_fragments )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] num fragments %d outside of range of max fragments %d\n", name, *num_fragments, max_fragments );
return -1;
}
if ( *fragment_id >= *num_fragments )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] fragment id %d outside of range of num fragments %d\n", name, *fragment_id, *num_fragments );
return -1;
}
*fragment_bytes = packet_bytes - RELIABLE_FRAGMENT_HEADER_BYTES;
uint16_t packet_sequence = 0;
uint16_t packet_ack = 0;
uint32_t packet_ack_bits = 0;
if ( *fragment_id == 0 )
{
int packet_header_bytes = reliable_read_packet_header( name,
packet_data + RELIABLE_FRAGMENT_HEADER_BYTES,
packet_bytes,
&packet_sequence,
&packet_ack,
&packet_ack_bits );
if ( packet_header_bytes < 0 )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] bad packet header in fragment\n", name );
return -1;
}
if ( packet_sequence != *sequence )
{
reliable_printf( RELIABLE_LOG_LEVEL_DEBUG, "[%s] bad packet sequence in fragment. expected %d, got %d\n", name, *sequence, packet_sequence );
return -1;
}
*fragment_bytes = packet_bytes - packet_header_bytes - RELIABLE_FRAGMENT_HEADER_BYTES;
}