comparison: bfile_heuristics.c
bfile_heuristics.c
- changeset 34
- fa9bda32de17
- parent 33
- 1a2d7298bc82
- child 35
- 35120de6ee53
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| 33:1a2d7298bc82 | 34:fa9bda32de17 |
|---|---|
| 1 /* | |
| 2 * bfile_heuristics.c | |
| 3 * | |
| 4 * Created on: 20.10.2011 | |
| 5 * Author: Mike | |
| 6 */ | |
| 7 | |
| 8 #include "bfile_heuristics.h" | |
| 9 #include <ctype.h> | |
| 10 | |
| 11 bfile_heuristics_t *new_bfile_heuristics_t() { | |
| 12 bfile_heuristics_t *ret = malloc(sizeof(bfile_heuristics_t)); | |
| 13 ret->level = BFILE_MEDIUM_ACCURACY; | |
| 14 bfile_reset(ret); | |
| 15 return ret; | |
| 16 } | |
| 17 | |
| 18 void destroy_bfile_heuristics_t(bfile_heuristics_t *def) { | |
| 19 free(def); | |
| 20 } | |
| 21 | |
| 22 void bfile_reset(bfile_heuristics_t *def) { | |
| 23 def->bcount = 0; | |
| 24 def->tcount = 0; | |
| 25 } | |
| 26 | |
| 27 bool bfile_check(bfile_heuristics_t *def, int next_char) { | |
| 28 bool ret = false; | |
| 29 if (def->level != BFILE_IGNORE) { | |
| 30 def->tcount++; | |
| 31 if (!isprint(next_char) && !isspace(next_char)) { | |
| 32 def->bcount++; | |
| 33 } | |
| 34 | |
| 35 if (def->tcount > 1) { /* empty files are text files */ | |
| 36 switch (def->level) { | |
| 37 case BFILE_LOW_ACCURACY: | |
| 38 if (def->tcount > 15 || next_char == EOF) { | |
| 39 ret = (1.0*def->bcount)/def->tcount > 0.32; | |
| 40 } | |
| 41 break; | |
| 42 case BFILE_HIGH_ACCURACY: | |
| 43 if (def->tcount > 500 || next_char == EOF) { | |
| 44 ret = (1.0*def->bcount)/def->tcount > 0.1; | |
| 45 } | |
| 46 break; | |
| 47 default: /* BFILE_MEDIUM_ACCURACY */ | |
| 48 if (def->tcount > 100 || next_char == EOF) { | |
| 49 ret = (1.0*def->bcount)/def->tcount > 0.1; | |
| 50 } | |
| 51 break; | |
| 52 } | |
| 53 } | |
| 54 } | |
| 55 | |
| 56 return ret; | |
| 57 } |
