gio/xdgmime/xdgmimeint.c

   1 /* -*- mode: C; c-file-style: "gnu" -*- */
   2 /* xdgmimeint.c: Internal defines and functions.
   3  *
   4  * More info can be found at http://www.freedesktop.org/standards/
   5  *
   6  * Copyright (C) 2003  Red Hat, Inc.
   7  * Copyright (C) 2003  Jonathan Blandford <jrb@alum.mit.edu>
   8  *
   9  * Licensed under the Academic Free License version 2.0
  10  * Or under the following terms:
  11  *
  12  * This library is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU Lesser General Public
  14  * License as published by the Free Software Foundation; either
  15  * version 2 of the License, or (at your option) any later version.
  16  *
  17  * This library is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * Lesser General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Lesser General Public
  23  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  24  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "xdgmimeint.h"
  31 #include <ctype.h>
  32 #include <string.h>
  33
  34 #ifndef FALSE
  35 #define FALSE   (0)
  36 #endif
  37
  38 #ifndef TRUE
  39 #define TRUE    (!FALSE)
  40 #endif
  41
  42 static const char _xdg_utf8_skip_data[256] = {
  43   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  44   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  45   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  46   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  47   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  48   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  49   2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
  50   3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,6,6,1,1
  51 };
  52
  53 const char * const _xdg_utf8_skip = _xdg_utf8_skip_data;
  54
  55
  56
  57 /* Returns the number of unprocessed characters. */
  58 xdg_unichar_t
  59 _xdg_utf8_to_ucs4(const char *source)
  60 {
  61   xdg_unichar_t ucs32;
  62   if( ! ( *source & 0x80 ) )
  63     {
  64       ucs32 = *source;
  65     }
  66   else
  67     {
  68       int bytelength = 0;
  69       xdg_unichar_t result;
  70       if ( ! (*source & 0x40) )
  71         {
  72           ucs32 = *source;
  73         }
  74       else
  75         {
  76           if ( ! (*source & 0x20) )
  77             {
  78               result = *source++ & 0x1F;
  79               bytelength = 2;
  80             }
  81           else if ( ! (*source & 0x10) )
  82             {
  83               result = *source++ & 0x0F;
  84               bytelength = 3;
  85             }
  86           else if ( ! (*source & 0x08) )
  87             {
  88               result = *source++ & 0x07;
  89               bytelength = 4;
  90             }
  91           else if ( ! (*source & 0x04) )
  92             {
  93               result = *source++ & 0x03;
  94               bytelength = 5;
  95             }
  96           else if ( ! (*source & 0x02) )
  97             {
  98               result = *source++ & 0x01;
  99               bytelength = 6;
 100             }
 101           else
 102             {
 103               result = *source++;
 104               bytelength = 1;
 105             }
 106
 107           for ( bytelength --; bytelength > 0; bytelength -- )
 108             {
 109               result <<= 6;
 110               result |= *source++ & 0x3F;
 111             }
 112           ucs32 = result;
 113         }
 114     }
 115   return ucs32;
 116 }
 117
 118
 119 /* hullo.  this is great code.  don't rewrite it */
 120
 121 xdg_unichar_t
 122 _xdg_ucs4_to_lower (xdg_unichar_t source)
 123 {
 124   /* FIXME: Do a real to_upper sometime */
 125   /* CaseFolding-3.2.0.txt has a table of rules. */
 126   if ((source & 0xFF) == source)
 127     return (xdg_unichar_t) tolower ((unsigned char) source);
 128   return source;
 129 }
 130
 131 int
 132 _xdg_utf8_validate (const char *source)
 133 {
 134   /* FIXME: actually write */
 135   return TRUE;
 136 }
 137
 138 const char *
 139 _xdg_get_base_name (const char *file_name)
 140 {
 141   const char *base_name;
 142
 143   if (file_name == NULL)
 144     return NULL;
 145
 146   base_name = strrchr (file_name, '/');
 147
 148   if (base_name == NULL)
 149     return file_name;
 150   else
 151     return base_name + 1;
 152 }
 153
 154 xdg_unichar_t *
 155 _xdg_convert_to_ucs4 (const char *source, int *len)
 156 {
 157   xdg_unichar_t *out;
 158   int i;
 159   const char *p;
 160
 161   out = malloc (sizeof (xdg_unichar_t) * (strlen (source) + 1));
 162
 163   p = source;
 164   i = 0;
 165   while (*p)
 166     {
 167       out[i++] = _xdg_utf8_to_ucs4 (p);
 168       p = _xdg_utf8_next_char (p);
 169     }
 170   out[i] = 0;
 171   *len = i;
 172
 173   return out;
 174 }
 175
 176 void
 177 _xdg_reverse_ucs4 (xdg_unichar_t *source, int len)
 178 {
 179   xdg_unichar_t c;
 180   int i;
 181
 182   for (i = 0; i < len - i - 1; i++)
 183     {
 184       c = source[i];
 185       source[i] = source[len - i - 1];
 186       source[len - i - 1] = c;
 187     }
 188 }
 189