#include "cap_utils.h"

void cap_load(struct cap_file *cf, char* filename) {
  if ((cf->fd = fopen(filename, "r")) == NULL) {
    perror("Unable to open file");
    exit(EXIT_FAILURE);
  }

  fseek(cf->fd, 0, SEEK_END);
  cf->sz = ftell(cf->fd);
  fseek(cf->fd, 0, SEEK_SET);
}

void cap_next_bp(struct cap_file *cf, struct buffer_packet* bp) {
  fread(bp, sizeof(struct buffer_packet), 1, cf->fd);
}

void cap_peek_bp(struct cap_file *cf, struct buffer_packet* bp) {
  size_t n = fread(bp, sizeof(struct buffer_packet), 1, cf->fd);
  fseek(cf->fd, -n, SEEK_CUR);
}

size_t cap_count_bp(struct cap_file *cf) {
  return cf->sz / sizeof(struct buffer_packet);
}

void cap_unload(struct cap_file *cf) {
  fclose(cf->fd);
}