src/bfile_heuristics.c

Fri, 28 Dec 2012 15:44:28 +0100

author
Mike Becker <universe@uap-core.de>
date
Fri, 28 Dec 2012 15:44:28 +0100
changeset 34
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parent 23
bfile_heuristics.c@778388400f7b
child 36
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permissions
-rw-r--r--

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1 /*
34
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 * Copyright 2011 Mike Becker. All rights reserved.
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4 *
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions are met:
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7 *
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 *
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11 * 2. Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 *
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 *
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26 * bfile_heuristics.c
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27 *
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28 * Created on: 20.10.2011
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29 * Author: Mike
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30 */
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31
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32 #include "bfile_heuristics.h"
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33 #include <ctype.h>
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34
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35 bfile_heuristics_t *new_bfile_heuristics_t() {
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36 bfile_heuristics_t *ret = malloc(sizeof(bfile_heuristics_t));
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37 ret->level = BFILE_MEDIUM_ACCURACY;
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38 bfile_reset(ret);
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39 return ret;
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40 }
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41
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42 void destroy_bfile_heuristics_t(bfile_heuristics_t *def) {
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43 free(def);
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44 }
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45
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46 void bfile_reset(bfile_heuristics_t *def) {
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47 def->bcount = 0;
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48 def->tcount = 0;
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49 }
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50
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51 bool bfile_check(bfile_heuristics_t *def, int next_char) {
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52 bool ret = false;
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53 if (def->level != BFILE_IGNORE) {
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54 def->tcount++;
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55 if (!isprint(next_char) && !isspace(next_char)) {
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56 def->bcount++;
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57 }
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58
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59 if (def->tcount > 1) { /* empty files are text files */
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60 switch (def->level) {
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61 case BFILE_LOW_ACCURACY:
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62 if (def->tcount > 15 || next_char == EOF) {
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63 ret = (1.0*def->bcount)/def->tcount > 0.32;
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64 }
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65 break;
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66 case BFILE_HIGH_ACCURACY:
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67 if (def->tcount > 500 || next_char == EOF) {
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68 ret = (1.0*def->bcount)/def->tcount > 0.1;
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69 }
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70 break;
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71 default: /* BFILE_MEDIUM_ACCURACY */
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72 if (def->tcount > 100 || next_char == EOF) {
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73 ret = (1.0*def->bcount)/def->tcount > 0.1;
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74 }
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75 break;
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76 }
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77 }
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78 }
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80 return ret;
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81 }

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