cline: src/bfile_heuristics.c@0d2c13c24fd0

     1 /*

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

     3  * Copyright 2017 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  *

    26  * bfile_heuristics.c

    27  *

    28  *  Created on: 20.10.2011

    29  *      Author: Mike

    30  */

    32 #include "bfile_heuristics.h"

    33 #include <ctype.h>

    35 bfile_heuristics_t *new_bfile_heuristics_t() {

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

    37   ret->level = BFILE_MEDIUM_ACCURACY;

    38   bfile_reset(ret);

    39   return ret;

    40 }

    42 void destroy_bfile_heuristics_t(bfile_heuristics_t *def) {

    43   free(def);

    44 }

    46 void bfile_reset(bfile_heuristics_t *def) {

    47   def->bcount = 0;

    48   def->tcount = 0;

    49 }

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

    52   bool ret = false;

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

    54     def->tcount++;

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

    56       def->bcount++;

    57     }

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

    60       switch (def->level) {

    61       case BFILE_LOW_ACCURACY:

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

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

    64         }

    65         break;

    66       case BFILE_HIGH_ACCURACY:

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

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

    69         }

    70         break;

    71       default: /* BFILE_MEDIUM_ACCURACY */

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

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

    74         }

    75         break;

    76       }

    77     }

    78   }

    80   return ret;

    81 }

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