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mc/lib/charsets.c

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/*
Text conversion from one charset to another.
Copyright (C) 2001-2023
Free Software Foundation, Inc.
Written by:
Walery Studennikov <despair@sama.ru>
This file is part of the Midnight Commander.
The Midnight Commander is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
The Midnight Commander is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file charsets.c
* \brief Source: Text conversion from one charset to another
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lib/global.h"
#include "lib/strutil.h" /* utf-8 functions */
#include "lib/fileloc.h"
#include "lib/util.h" /* whitespace() */
#include "lib/charsets.h"
/*** global variables ****************************************************************************/
GPtrArray *codepages = NULL;
unsigned char conv_displ[256];
unsigned char conv_input[256];
const char *cp_display = NULL;
const char *cp_source = NULL;
/*** file scope macro definitions ****************************************************************/
#define UNKNCHAR '\001'
#define OTHER_8BIT "Other_8_bit"
/*** file scope type declarations ****************************************************************/
/*** forward declarations (file scope functions) *************************************************/
/*** file scope variables ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
static codepage_desc *
new_codepage_desc (const char *id, const char *name)
{
codepage_desc *desc;
desc = g_new (codepage_desc, 1);
desc->id = g_strdup (id);
desc->name = g_strdup (name);
return desc;
}
/* --------------------------------------------------------------------------------------------- */
static void
free_codepage_desc (gpointer data)
{
codepage_desc *desc = (codepage_desc *) data;
g_free (desc->id);
g_free (desc->name);
g_free (desc);
}
/* --------------------------------------------------------------------------------------------- */
/* returns display codepage */
static void
load_codepages_list_from_file (GPtrArray ** list, const char *fname)
{
FILE *f;
char buf[BUF_MEDIUM];
char *default_codepage = NULL;
f = fopen (fname, "r");
if (f == NULL)
return;
while (fgets (buf, sizeof buf, f) != NULL)
{
/* split string into id and cpname */
char *p = buf;
size_t buflen;
if (*p == '\n' || *p == '\0' || *p == '#')
continue;
buflen = strlen (buf);
if (buflen != 0 && buf[buflen - 1] == '\n')
buf[buflen - 1] = '\0';
while (*p != '\0' && !whitespace (*p))
++p;
if (*p == '\0')
goto fail;
*p++ = '\0';
g_strstrip (p);
if (*p == '\0')
goto fail;
if (strcmp (buf, "default") == 0)
default_codepage = g_strdup (p);
else
{
const char *id = buf;
if (*list == NULL)
{
*list = g_ptr_array_sized_new (16);
g_ptr_array_add (*list, new_codepage_desc (id, p));
}
else
{
unsigned int i;
/* whether id is already present in list */
/* if yes, overwrite description */
for (i = 0; i < (*list)->len; i++)
{
codepage_desc *desc;
desc = (codepage_desc *) g_ptr_array_index (*list, i);
if (strcmp (id, desc->id) == 0)
{
/* found */
g_free (desc->name);
desc->name = g_strdup (p);
break;
}
}
/* not found */
if (i == (*list)->len)
g_ptr_array_add (*list, new_codepage_desc (id, p));
}
}
}
if (default_codepage != NULL)
{
mc_global.display_codepage = get_codepage_index (default_codepage);
g_free (default_codepage);
}
fail:
fclose (f);
}
/* --------------------------------------------------------------------------------------------- */
static char
translate_character (GIConv cd, char c)
{
gchar *tmp_buff = NULL;
gsize bytes_read, bytes_written = 0;
const char *ibuf = &c;
char ch = UNKNCHAR;
int ibuflen = 1;
tmp_buff = g_convert_with_iconv (ibuf, ibuflen, cd, &bytes_read, &bytes_written, NULL);
if (tmp_buff != NULL)
ch = tmp_buff[0];
g_free (tmp_buff);
return ch;
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
void
load_codepages_list (void)
{
char *fname;
/* 1: try load /usr/share/mc/mc.charsets */
fname = g_build_filename (mc_global.share_data_dir, CHARSETS_LIST, (char *) NULL);
load_codepages_list_from_file (&codepages, fname);
g_free (fname);
/* 2: try load /etc/mc/mc.charsets */
fname = g_build_filename (mc_global.sysconfig_dir, CHARSETS_LIST, (char *) NULL);
load_codepages_list_from_file (&codepages, fname);
g_free (fname);
if (codepages == NULL)
{
/* files are not found, add default codepage */
fprintf (stderr, "%s\n", _("Warning: cannot load codepages list"));
codepages = g_ptr_array_new_with_free_func (free_codepage_desc);
g_ptr_array_add (codepages, new_codepage_desc (DEFAULT_CHARSET, _("7-bit ASCII")));
}
}
/* --------------------------------------------------------------------------------------------- */
void
free_codepages_list (void)
{
g_ptr_array_free (codepages, TRUE);
/* NULL-ize pointer to make unit tests happy */
codepages = NULL;
}
/* --------------------------------------------------------------------------------------------- */
const char *
get_codepage_id (const int n)
{
return (n < 0) ? OTHER_8BIT : ((codepage_desc *) g_ptr_array_index (codepages, n))->id;
}
/* --------------------------------------------------------------------------------------------- */
int
get_codepage_index (const char *id)
{
size_t i;
if (codepages == NULL)
return -1;
if (strcmp (id, OTHER_8BIT) == 0)
return -1;
for (i = 0; i < codepages->len; i++)
if (strcmp (id, ((codepage_desc *) g_ptr_array_index (codepages, i))->id) == 0)
return i;
return -1;
}
/* --------------------------------------------------------------------------------------------- */
/** Check if specified encoding can be used in mc.
* @param encoding name of encoding
* @return TRUE if encoding is supported by mc, FALSE otherwise
*/
gboolean
is_supported_encoding (const char *encoding)
{
gboolean result = FALSE;
guint t;
for (t = 0; t < codepages->len; t++)
{
const char *id;
id = ((codepage_desc *) g_ptr_array_index (codepages, t))->id;
result |= (g_ascii_strncasecmp (encoding, id, strlen (id)) == 0);
}
return result;
}
/* --------------------------------------------------------------------------------------------- */
char *
init_translation_table (int cpsource, int cpdisplay)
{
int i;
GIConv cd;
/* Fill inpit <-> display tables */
if (cpsource < 0 || cpdisplay < 0 || cpsource == cpdisplay)
{
for (i = 0; i <= 255; ++i)
{
conv_displ[i] = i;
conv_input[i] = i;
}
cp_source = cp_display;
return NULL;
}
for (i = 0; i <= 127; ++i)
{
conv_displ[i] = i;
conv_input[i] = i;
}
cp_source = ((codepage_desc *) g_ptr_array_index (codepages, cpsource))->id;
cp_display = ((codepage_desc *) g_ptr_array_index (codepages, cpdisplay))->id;
/* display <- inpit table */
cd = g_iconv_open (cp_display, cp_source);
if (cd == INVALID_CONV)
return g_strdup_printf (_("Cannot translate from %s to %s"), cp_source, cp_display);
for (i = 128; i <= 255; ++i)
conv_displ[i] = translate_character (cd, i);
g_iconv_close (cd);
/* inpit <- display table */
cd = g_iconv_open (cp_source, cp_display);
if (cd == INVALID_CONV)
return g_strdup_printf (_("Cannot translate from %s to %s"), cp_display, cp_source);
for (i = 128; i <= 255; ++i)
{
unsigned char ch;
ch = translate_character (cd, i);
conv_input[i] = (ch == UNKNCHAR) ? i : ch;
}
g_iconv_close (cd);
return NULL;
}
/* --------------------------------------------------------------------------------------------- */
void
convert_to_display (char *str)
{
if (str != NULL)
for (; *str != '\0'; str++)
*str = conv_displ[(unsigned char) *str];
}
/* --------------------------------------------------------------------------------------------- */
GString *
str_nconvert_to_display (const char *str, int len)
{
GString *buff;
GIConv conv;
if (str == NULL)
return NULL;
if (cp_display == cp_source)
return g_string_new (str);
conv = str_crt_conv_from (cp_source);
buff = g_string_new ("");
str_nconvert (conv, str, len, buff);
str_close_conv (conv);
return buff;
}
/* --------------------------------------------------------------------------------------------- */
void
convert_from_input (char *str)
{
if (str != NULL)
for (; *str != '\0'; str++)
*str = conv_input[(unsigned char) *str];
}
/* --------------------------------------------------------------------------------------------- */
GString *
str_nconvert_to_input (const char *str, int len)
{
GString *buff;
GIConv conv;
if (str == NULL)
return NULL;
if (cp_display == cp_source)
return g_string_new (str);
conv = str_crt_conv_to (cp_source);
buff = g_string_new ("");
str_nconvert (conv, str, len, buff);
str_close_conv (conv);
return buff;
}
/* --------------------------------------------------------------------------------------------- */
unsigned char
convert_from_utf_to_current (const char *str)
{
unsigned char buf_ch[UTF8_CHAR_LEN + 1];
unsigned char ch = '.';
GIConv conv;
const char *cp_to;
if (str == NULL)
return '.';
cp_to = get_codepage_id (mc_global.source_codepage);
conv = str_crt_conv_to (cp_to);
if (conv != INVALID_CONV)
{
switch (str_translate_char (conv, str, -1, (char *) buf_ch, sizeof (buf_ch)))
{
case ESTR_SUCCESS:
ch = buf_ch[0];
break;
case ESTR_PROBLEM:
case ESTR_FAILURE:
ch = '.';
break;
default:
break;
}
str_close_conv (conv);
}
return ch;
}
/* --------------------------------------------------------------------------------------------- */
unsigned char
convert_from_utf_to_current_c (int input_char, GIConv conv)
{
unsigned char str[UTF8_CHAR_LEN + 1];
unsigned char buf_ch[UTF8_CHAR_LEN + 1];
unsigned char ch = '.';
int res;
res = g_unichar_to_utf8 (input_char, (char *) str);
if (res == 0)
return ch;
str[res] = '\0';
switch (str_translate_char (conv, (char *) str, -1, (char *) buf_ch, sizeof (buf_ch)))
{
case ESTR_SUCCESS:
ch = buf_ch[0];
break;
case ESTR_PROBLEM:
case ESTR_FAILURE:
ch = '.';
break;
default:
break;
}
return ch;
}
/* --------------------------------------------------------------------------------------------- */
int
convert_from_8bit_to_utf_c (char input_char, GIConv conv)
{
unsigned char str[2];
unsigned char buf_ch[UTF8_CHAR_LEN + 1];
int ch;
str[0] = (unsigned char) input_char;
str[1] = '\0';
switch (str_translate_char (conv, (char *) str, -1, (char *) buf_ch, sizeof (buf_ch)))
{
case ESTR_SUCCESS:
{
int res;
res = g_utf8_get_char_validated ((char *) buf_ch, -1);
ch = res >= 0 ? res : buf_ch[0];
break;
}
case ESTR_PROBLEM:
case ESTR_FAILURE:
default:
ch = '.';
break;
}
return ch;
}
/* --------------------------------------------------------------------------------------------- */
int
convert_from_8bit_to_utf_c2 (char input_char)
{
int ch = '.';
GIConv conv;
const char *cp_from;
cp_from = get_codepage_id (mc_global.source_codepage);
conv = str_crt_conv_to (cp_from);
if (conv != INVALID_CONV)
{
ch = convert_from_8bit_to_utf_c (input_char, conv);
str_close_conv (conv);
}
return ch;
}
/* --------------------------------------------------------------------------------------------- */
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