universe@20: /*
universe@20:  * bfile_heuristics.c
universe@20:  *
universe@20:  *  Created on: 20.10.2011
universe@20:  *      Author: Mike
universe@20:  */
universe@20: 
universe@20: #include "bfile_heuristics.h"
universe@22: #include <ctype.h>
universe@20: 
universe@21: bfile_heuristics_t *new_bfile_heuristics_t() {
universe@21:   bfile_heuristics_t *ret = malloc(sizeof(bfile_heuristics_t));
universe@21:   ret->level = BFILE_MEDIUM_ACCURACY;
universe@22:   bfile_reset(ret);
universe@21:   return ret;
universe@20: }
universe@20: 
universe@21: void destroy_bfile_heuristics_t(bfile_heuristics_t *def) {
universe@21:   free(def);
universe@20: }
universe@21: 
universe@22: void bfile_reset(bfile_heuristics_t *def) {
universe@22:   def->bcount = 0;
universe@22:   def->tcount = 0;
universe@22: }
universe@22: 
universe@21: bool bfile_check(bfile_heuristics_t *def, int next_char) {
universe@21:   bool ret = false;
universe@22:   if (def->level != BFILE_IGNORE) {
universe@22:     def->tcount++;
universe@22:     if (!isprint(next_char) && !isspace(next_char)) {
universe@22:       def->bcount++;
universe@22:     }
universe@22: 
universe@22:     switch (def->level) {
universe@22:     case BFILE_LOW_ACCURACY:
universe@22:       if (def->tcount > 15 || next_char == EOF) {
universe@22:         ret = (1.0*def->bcount)/def->tcount > 0.32;
universe@22:       }
universe@22:       break;
universe@22:     case BFILE_HIGH_ACCURACY:
universe@22:       if (def->tcount > 500 || next_char == EOF) {
universe@22:         ret = (1.0*def->bcount)/def->tcount > 0.1;
universe@22:       }
universe@22:       break;
universe@22:     default: /* BFILE_MEDIUM_ACCURACY */
universe@22:       if (def->tcount > 100 || next_char == EOF) {
universe@22:         ret = (1.0*def->bcount)/def->tcount > 0.1;
universe@22:       }
universe@22:     }
universe@22:   }
universe@21: 
universe@21:   return ret;
universe@21: }