lib/search/hex.c

   1 /*
   2    Search text engine.
   3    HEX-style pattern matching
   4
   5    Copyright (C) 2009 The Free Software Foundation, Inc.
   6
   7    Written by:
   8    Slava Zanko <slavazanko@gmail.com>, 2009.
   9
  10    This file is part of the Midnight Commander.
  11
  12    The Midnight Commander is free software; you can redistribute it
  13    and/or modify it under the terms of the GNU General Public License as
  14    published by the Free Software Foundation; either version 2 of the
  15    License, or (at your option) any later version.
  16
  17    The Midnight Commander is distributed in the hope that it will be
  18    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  19    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20    General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  25    MA 02110-1301, USA.
  26  */
  27
  28 #include <config.h>
  29
  30 #include <stdio.h>
  31
  32 #include "lib/global.h"
  33 #include "lib/strutil.h"
  34 #include "lib/search.h"
  35 #include "lib/strescape.h"
  36
  37 #include "src/charsets.h"
  38
  39 #include "internal.h"
  40
  41 /*** global variables ****************************************************************************/
  42
  43 /*** file scope macro definitions ****************************************************************/
  44
  45 /*** file scope type declarations ****************************************************************/
  46
  47 /*** file scope variables ************************************************************************/
  48
  49 /*** file scope functions ************************************************************************/
  50
  51 static GString *
  52 mc_search__hex_translate_to_regex (const GString * astr)
  53 {
  54     const char *str = astr->str;
  55     GString *buff = g_string_new ("");
  56     gchar *tmp_str = g_strndup (str, astr->len);
  57     gchar *tmp_str2;
  58     gsize loop = 0;
  59     int val, ptr;
  60
  61     g_strchug (tmp_str);        /* trim leadind whitespaces */
  62
  63     while (loop < astr->len) {
  64         if (sscanf (tmp_str + loop, "%i%n", &val, &ptr)) {
  65             if (val < -128 || val > 255) {
  66                 loop++;
  67                 continue;
  68             }
  69             tmp_str2 = g_strdup_printf ("\\x%02X", (unsigned char) val);
  70             g_string_append (buff, tmp_str2);
  71             g_free (tmp_str2);
  72             loop += ptr;
  73             continue;
  74         }
  75
  76         if (*(tmp_str + loop) == '"') {
  77             gsize loop2 = 0;
  78             loop++;
  79             while (loop + loop2 < astr->len) {
  80                 if (*(tmp_str + loop + loop2) == '"' &&
  81                     !strutils_is_char_escaped (tmp_str, tmp_str + loop + loop2))
  82                     break;
  83                 loop2++;
  84             }
  85             g_string_append_len (buff, tmp_str + loop, loop2 - 1);
  86             loop += loop2;
  87             continue;
  88         }
  89         loop++;
  90     }
  91
  92     g_free (tmp_str);
  93
  94     return buff;
  95 }
  96
  97 /*** public functions ****************************************************************************/
  98
  99 void
 100 mc_search__cond_struct_new_init_hex (const char *charset, mc_search_t * lc_mc_search,
 101                                      mc_search_cond_t * mc_search_cond)
 102 {
 103     GString *tmp;
 104
 105     tmp = mc_search__hex_translate_to_regex (mc_search_cond->str);
 106     g_string_free (mc_search_cond->str, TRUE);
 107     mc_search_cond->str = tmp;
 108
 109     mc_search__cond_struct_new_init_regex (charset, lc_mc_search, mc_search_cond);
 110 }
 111
 112 /* --------------------------------------------------------------------------------------------- */
 113
 114 gboolean
 115 mc_search__run_hex (mc_search_t * lc_mc_search, const void *user_data,
 116                     gsize start_search, gsize end_search, gsize * found_len)
 117 {
 118     return mc_search__run_regex (lc_mc_search, user_data, start_search, end_search, found_len);
 119 }
 120
 121 /* --------------------------------------------------------------------------------------------- */
 122
 123 GString *
 124 mc_search_hex_prepare_replace_str (mc_search_t * lc_mc_search, GString * replace_str)
 125 {
 126     (void) lc_mc_search;
 127     return g_string_new_len (replace_str->str, replace_str->len);
 128 }
 129
 130 /* --------------------------------------------------------------------------------------------- */