cline: src/bfile_heuristics.c@68018eac46c3

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  * Copyright 2018 Mike Becker. All rights reserved.

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions are met:

     7  *

     8  * 1. Redistributions of source code must retain the above copyright

     9  * notice, this list of conditions and the following disclaimer.

    10  *

    11  * 2. Redistributions in binary form must reproduce the above copyright

    12  * notice, this list of conditions and the following disclaimer in the

    13  * documentation and/or other materials provided with the distribution.

    14  *

    15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    16  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

    18  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

    19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

    20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

    21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

    22  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

    23  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    25  */

    27 #include "bfile_heuristics.h"

    28 #include <ctype.h>

    30 bfile_heuristics_t *new_bfile_heuristics_t() {

    31   bfile_heuristics_t *ret = malloc(sizeof(bfile_heuristics_t));

    32   ret->level = BFILE_MEDIUM_ACCURACY;

    33   bfile_reset(ret);

    34   return ret;

    35 }

    37 void destroy_bfile_heuristics_t(bfile_heuristics_t *def) {

    38   free(def);

    39 }

    41 void bfile_reset(bfile_heuristics_t *def) {

    42   def->bcount = 0;

    43   def->tcount = 0;

    44 }

    46 bool bfile_check(bfile_heuristics_t *def, int next_char) {

    47   bool ret = false;

    48   if (def->level != BFILE_IGNORE) {

    49     def->tcount++;

    50     if (!isprint(next_char) && !isspace(next_char)) {

    51       def->bcount++;

    52     }

    54     if (def->tcount > 1) { /* empty files are text files */

    55       switch (def->level) {

    56       case BFILE_LOW_ACCURACY:

    57         if (def->tcount > 15 || next_char == EOF) {

    58           ret = (1.0*def->bcount)/def->tcount > 0.32;

    59         }

    60         break;

    61       case BFILE_HIGH_ACCURACY:

    62         if (def->tcount > 500 || next_char == EOF) {

    63           ret = (1.0*def->bcount)/def->tcount > 0.1;

    64         }

    65         break;

    66       default: /* BFILE_MEDIUM_ACCURACY */

    67         if (def->tcount > 100 || next_char == EOF) {

    68           ret = (1.0*def->bcount)/def->tcount > 0.1;

    69         }

    70         break;

    71       }

    72     }

    73   }

    75   return ret;

    76 }

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