196 lines
6.4 KiB
C++
196 lines
6.4 KiB
C++
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/*
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* CircularBinaryRemoteBuffer.cpp
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*
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* Created on: 24 <EFBFBD><EFBFBD><EFBFBD>. 2020 <EFBFBD>.
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* Author: LeonidTitov
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*/
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#include "CircularBinaryRemoteBuffer.hh"
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#include <cstring>
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#include <algorithm>
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std::size_t driver::CircularBinaryRemoteBuffer::get_frame_size() const {
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return frame_size;
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}
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bool driver::CircularBinaryRemoteBuffer::put( const char * frame ) {
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if( memory.isWriteComplete() ) {
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if( put_cache_writed == put_cache_stored ) {
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std::size_t grow_up = ( put_cache_writed - put_cache_begin ) / frame_size;
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index_in_memory = wrap_index( index_in_memory + grow_up );
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put_cache_writed = put_cache_stored = put_cache_begin;
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}
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}
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if( put_cache_stored + frame_size <= put_cache_end ) {
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index = wrap_index( index + 1 );
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loaded_frames = loaded_frames + 1 < number_of_frames ? loaded_frames + 1 : number_of_frames;
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std::memcpy( put_cache_stored, frame, frame_size );
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put_cache_stored += frame_size;
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} else return false;
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std::size_t part_size = cut_part( put_cache_stored - put_cache_writed );
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if( memory.write( put_cache_writed, position_in_memory, part_size ) ) {
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put_cache_writed += part_size;
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position_in_memory = wrap_position( position_in_memory + part_size );
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}
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return true;
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}
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void driver::CircularBinaryRemoteBuffer::clear() {
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std::size_t current_index = index;
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//todo: <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>.
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do {
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index_in_memory = 0;
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put_cache_writed = put_cache_stored = put_cache_begin;
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index = 0;
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loaded_frames = 0;
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position_in_memory = 0;
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cached_index_begin = 0;
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cached_index_end = 0;
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} while( current_index != index );
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}
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std::pair<driver::CircularBinaryRemoteBuffer::Index, std::size_t> driver::CircularBinaryRemoteBuffer::fixate( std::size_t desired_pretrigger_frames ) {
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std::size_t current_index = index;
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std::size_t pretrigger_frames = desired_pretrigger_frames < loaded_frames ? desired_pretrigger_frames : loaded_frames;
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loaded_frames = pretrigger_frames;
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return { Index( current_index < pretrigger_frames ? number_of_frames - pretrigger_frames + current_index : current_index - pretrigger_frames, number_of_frames ),
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pretrigger_frames };
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}
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driver::CircularBinaryRemoteBuffer::CircularBinaryRemoteBuffer(
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peripheral::IMemoryAccess & memory, std::size_t frame_size,
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char * put_cache, std::size_t put_cache_size,
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char * get_cache, std::size_t get_cache_size ) :
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memory(memory), frame_size(frame_size),
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put_cache_begin(put_cache), put_cache_end(put_cache + put_cache_size), put_cache_stored(put_cache), put_cache_writed(put_cache),
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get_cache_begin(get_cache), get_cache_capacity( get_cache_size / frame_size ),
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index(0), index_in_memory(0), loaded_frames(0), position_in_memory(0), number_of_frames(memory.getCapacity() / frame_size), useful_capacity((memory.getCapacity() / frame_size)*frame_size),
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cached_index_begin(0), cached_index_end(0) {}
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std::size_t driver::CircularBinaryRemoteBuffer::wrap_index(
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std::size_t next_index ) {
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return next_index < number_of_frames ? next_index : next_index - number_of_frames;
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}
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std::size_t driver::CircularBinaryRemoteBuffer::wrap_position(
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std::size_t next_position ) {
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return next_position < useful_capacity ? next_position : next_position - useful_capacity;
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}
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void driver::CircularBinaryRemoteBuffer::restart( const Index & frame_index ) {
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//todo:
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}
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std::size_t driver::CircularBinaryRemoteBuffer::fixed( const Index & frame_index ) const {
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std::size_t current_index = index;
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std::size_t temp = ( current_index < frame_index.position ?
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number_of_frames - frame_index.position + current_index :
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current_index - frame_index.position );
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return temp > loaded_frames ? 0 : temp;
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}
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std::size_t driver::CircularBinaryRemoteBuffer::available_in_memory(
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const Index & frame_index ) {
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std::size_t temp = ( index_in_memory < frame_index.position ?
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number_of_frames - frame_index.position + index_in_memory :
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index_in_memory - frame_index.position );
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return temp > loaded_frames ? 0 : temp;
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}
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const char * driver::CircularBinaryRemoteBuffer::get( const Index & frame_index ) {
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if( not fixed( frame_index ) )
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return nullptr;
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if( cached_index_begin <= frame_index.position and frame_index.position < cached_index_end )
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return get_cache_begin + frame_size * ( frame_index.position - cached_index_begin );
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std::size_t current_index = index;
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std::size_t load_from_memory = std::min( available_in_memory( frame_index ), get_cache_capacity );
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std::size_t available_frames = std::min( fixed( frame_index ), get_cache_capacity );
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std::size_t load_from_cache = available_frames - load_from_memory;
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if( load_from_memory < get_cache_capacity ) do {
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current_index = index;
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load_from_memory = std::min( available_in_memory( frame_index ), get_cache_capacity );
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available_frames = std::min( fixed( frame_index ), get_cache_capacity );
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load_from_cache = available_frames - load_from_memory;
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std::memcpy( get_cache_begin + load_from_memory * frame_size, put_cache_begin, load_from_cache * frame_size );
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} while( current_index != index );
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std::size_t first_part = ( load_from_memory * frame_size + frame_index.position * frame_size ) < useful_capacity ? load_from_memory * frame_size : useful_capacity - frame_index.position * frame_size; //cut_part( load_from_memory * frame_size );
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std::size_t second_part = load_from_memory * frame_size - first_part;
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if( first_part ) {
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while( not memory.read( get_cache_begin, frame_index.position * frame_size, first_part ) );
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while( not memory.isReadComplete() );
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}
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if( second_part ) {
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//todo: wrap position?
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while( not memory.read( get_cache_begin + first_part, 0, second_part ) );
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while( not memory.isReadComplete() );
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}
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cached_index_begin = frame_index.position;
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cached_index_end = frame_index.position + available_frames;
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return get( frame_index );
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}
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std::size_t driver::CircularBinaryRemoteBuffer::capacity() const {
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return number_of_frames;
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}
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std::size_t driver::CircularBinaryRemoteBuffer::cut_part( std::size_t next_part ) {
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return ( next_part + position_in_memory ) < useful_capacity ? next_part : useful_capacity - position_in_memory;
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}
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