CyclicDataGenerator.cpp

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#include "dpdklibs/CyclicDataGenerator.hpp"
 
#define DEFAULT_CYCLIC_PATTERN "abcdefghijklmnopqrstuvwxyz"
 
using namespace dunedaq::dpdklibs::cyclicdatagenerator;
 
CyclicDataGenerator::CyclicDataGenerator(size_t offset)
  : pattern(DEFAULT_CYCLIC_PATTERN)
  , slice_len(strlen(DEFAULT_CYCLIC_PATTERN))
{
  this->current_slice_index = offset % slice_len;
}
 
CyclicDataGenerator::CyclicDataGenerator(char* pattern, size_t offset)
  : pattern(pattern)
  , slice_len(strlen(pattern))
{
  this->current_slice_index = offset % slice_len;
}
 
char
CyclicDataGenerator::get_next()
{
  size_t i = current_slice_index;
 
  if (current_slice_index + 1 == slice_len) {
    current_slice_index = 0;
  } else {
    current_slice_index++;
  }
 
  return pattern[i];
}
 
void
CyclicDataGenerator::get_next_n(char* dst, size_t n)
{
  char buffer[n];
 
  for (size_t i = 0; i < n; i++) {
    buffer[i] = get_next();
  }
 
  strcpy(dst, buffer);
}
 
char
CyclicDataGenerator::get_prev()
{
  size_t i = current_slice_index;
 
  if (current_slice_index == 0) {
    current_slice_index = slice_len - 1;
  } else {
    current_slice_index--;
  }
 
  return pattern[i];
}
 
void
CyclicDataGenerator::get_prev_n(char* dst, size_t n)
{
  char buffer[n];
 
  for (size_t i = 0; i < n; i++) {
    buffer[i] = get_prev();
  }
 
  strcpy(dst, buffer);
}
 
CyclicDataGenerator::~CyclicDataGenerator() {}