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/*
* PacketLib.h
*
* Created on: Nov 24, 2022
* Author: valerio
*/
#ifndef INCLUDE_BASEPACKET_H_
#define INCLUDE_BASEPACKET_H_
#include <vector>
#include <map>
#include <string>
#include <cstring>
#include <algorithm>
#include <iostream>
#include <cmath>
namespace inaf::oasbo::PacketLib {
class BasePacketStructure {
public:
virtual ~BasePacketStructure() = default;
virtual std::vector<std::tuple<int, std::string, int>> getPacketStructure() = 0;
};
template<template<typename > class T, typename V>
class BasePacket {
private:
std::vector<int> fieldSizes;
T<V> structure;
std::map<std::string, int> fieldNameToIndexMap;
std::map<int, std::string> indexToFieldNameMap;
uint8_t *binaryPointer;
void updateFieldSizes(
const std::vector<std::tuple<int, std::string, int>> ¶msTuple) {
std::for_each(paramsTuple.begin(), paramsTuple.end(),
[&](const std::tuple<int, std::string, int> &tup) {
this->fieldSizes.push_back(std::get<2>(tup));
});
}
void updateFieldNameAndIndexMap(
const std::vector<std::tuple<int, std::string, int>> ¶msTuple) {
std::for_each(paramsTuple.begin(), paramsTuple.end(),
[&](const std::tuple<int, std::string, int> &tup) {
this->fieldNameToIndexMap[std::get<1>(tup)] = std::get<0>(
tup);
this->indexToFieldNameMap[std::get<0>(tup)] = std::get<1>(
tup);
});
}
void initMemoryStructure(int numberOfField) {
this->structure.resize(numberOfField);
std::fill(this->structure.begin(), this->structure.end(), 0);
}
void updateStructureFromBinary() {
size_t num_bit_read = 0; // offset from the beginning of the byte
for (long unsigned int i = 0; i < this->fieldSizes.size(); i++) {
int bit_rem = this->fieldSizes[i]; //remaining bits to read
V val = 0; //final value of the field
while (bit_rem > 0) {
size_t read = this->binaryPointer[num_bit_read / 8];
size_t mask = std::pow(2, 8 - num_bit_read % 8) - 1;
read = read & mask;
bit_rem = bit_rem - 8 + num_bit_read % 8;
read = (bit_rem >= 0) * (read << bit_rem)
+ (bit_rem < 0) * (read >> -bit_rem);
val += read;
num_bit_read =
(bit_rem > 0) * (num_bit_read + 8 - num_bit_read % 8)
+ (bit_rem <= 0)
* (num_bit_read + 8 - num_bit_read % 8
+ bit_rem);
}
this->structure[i] = val;
}
}
public:
BasePacket(std::vector<std::tuple<int, std::string, int>> paramsTuple) {
this->updateFieldSizes(paramsTuple);
this->updateFieldNameAndIndexMap(paramsTuple);
this->initMemoryStructure(paramsTuple.size());
this->binaryPointer = new uint8_t[paramsTuple.size() * sizeof(size_t)]; //tot number of field times the maximum bytesize of the value;
}
virtual ~BasePacket() = default;
std::vector<int> const* getFieldSizes() const {
return &fieldSizes;
}
uint8_t const* getBinaryPointer() const {
return binaryPointer;
}
T<V> const* getStructure() const {
return &structure;
}
void copyToBinaryPointer(const uint8_t *from, uint size) {
std::memcpy(binaryPointer, from, size);
updateStructureFromBinary();
}
void copyToBinaryPointer(const uint8_t *from, uint size, uint offset) {
std::memcpy(&binaryPointer[offset], from, size);
updateStructureFromBinary();
}
size_t indexOfField(std::string fieldName) {
return this->fieldNameToIndexMap.at(fieldName);
}
std::string fieldNameOfIndex(size_t index) {
return this->indexToFieldNameMap.at(index);
}
V getNumberOfFields() {
return this->structure.size();
}
V operator[](int index) const {
return this->structure[index];
}
V operator[](std::string fieldName) const {
int index = this->fieldNameToIndexMap.at(fieldName);
return this->structure[index];
}
typename T<V>::iterator begin() const {
return this->getStructure()->begin();
}
typename T<V>::iterator end() const {
return this->getStructure()->end();
}
typename T<V>::const_iterator cbegin() const {
return this->getStructure()->cbegin();
}
typename T<V>::const_iterator cend() const {
return this->getStructure()->cend();
}
void setValueAt(int index, V val) const {
structure.at(index) = val;
}
V at(int index) const {
return this->structure.at(index);
}
virtual size_t getHeaderSize()=0;
virtual size_t getPayloadSize()=0;
virtual size_t getTailSize()=0;
virtual size_t getMaxPacketSize()=0;
};
}
#endif