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/* Audacious
* Copyright (C) 2005-2007 Audacious development team.
*
* This program 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; under version 3 of the License.
*
* This program 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>.
*
* The Audacious team does not consider modular code linking to
* Audacious or using our public API to be a derived work.
*/
#include "config.h"
#include "chardet.h"
#include "audstrings.h"
#include <glib/gi18n.h>
#include "main.h"
#ifdef USE_CHARDET
# include "../libguess/libguess.h"
#endif
gchar *
cd_str_to_utf8(const gchar * str)
{
gchar *out_str;
if (str == NULL)
return NULL;
/* Note: Currently, playlist calls this function repeatedly, even
* if the string is already converted into utf-8.
* chardet_to_utf8() would convert a valid utf-8 string into a
* different utf-8 string, if fallback encodings were supplied and
* the given string could be treated as a string in one of
* fallback encodings. To avoid this, g_utf8_validate() had been
* used at the top of evaluation.
*/
/* Note 2: g_utf8_validate() has so called encapsulated utf-8
* problem, thus chardet_to_utf8() took the place of that.
*/
/* Note 3: As introducing madplug, the problem of conversion from
* ISO-8859-1 to UTF-8 arose. This may be coped with g_convert()
* located near the end of chardet_to_utf8(), but it requires utf8
* validation guard where g_utf8_validate() was. New
* dfa_validate_utf8() employs libguess' DFA engine to validate
* utf-8 and can properly distinguish examples of encapsulated
* utf-8. It is considered to be safe to use as a guard.
*/
/* Already UTF-8? */
#ifdef USE_CHARDET
if (dfa_validate_utf8(str, strlen(str)))
return g_strdup(str);
#else
if (g_utf8_validate(str, strlen(str), NULL))
return g_strdup(str);
#endif
/* chardet encoding detector */
if ((out_str = cd_chardet_to_utf8(str, strlen(str), NULL, NULL, NULL)) != NULL)
return out_str;
/* assume encoding associated with locale */
if ((out_str = g_locale_to_utf8(str, -1, NULL, NULL, NULL)) != NULL)
return out_str;
/* all else fails, we mask off character codes >= 128, replace with '?' */
return str_to_utf8_fallback(str);
}
gchar *
cd_chardet_to_utf8(const gchar * str, gssize len, gsize * arg_bytes_read,
gsize * arg_bytes_write, GError ** error)
{
#ifdef USE_CHARDET
gchar *det = NULL, *encoding = NULL;
#endif
gchar *ret = NULL;
gsize *bytes_read, *bytes_write;
gsize my_bytes_read, my_bytes_write;
bytes_read = arg_bytes_read != NULL ? arg_bytes_read : &my_bytes_read;
bytes_write = arg_bytes_write != NULL ? arg_bytes_write : &my_bytes_write;
g_return_val_if_fail(str != NULL, NULL);
#ifdef USE_CHARDET
if (cfg.chardet_detector)
det = cfg.chardet_detector;
if (det)
{
encoding = (gchar *) guess_encoding(str, strlen(str), det);
if (encoding == NULL)
goto fallback;
ret = g_convert(str, len, "UTF-8", encoding, bytes_read, bytes_write, error);
}
fallback:
#endif
/* If detection failed or was not enabled, try fallbacks (if there are any) */
if (ret == NULL && cfg.chardet_fallback_s != NULL)
{
gchar **enc;
for (enc = cfg.chardet_fallback_s; *enc != NULL; enc++)
{
ret = g_convert(str, len, "UTF-8", *enc, bytes_read, bytes_write, error);
if (len == *bytes_read)
break;
else {
g_free(ret);
ret = NULL;
}
}
}
/* The final fallback is ISO-8859-1, if no other is specified or conversions fail */
if (ret == NULL)
ret = g_convert(str, len, "UTF-8", "ISO-8859-1", bytes_read, bytes_write, error);
if (ret != NULL)
{
if (g_utf8_validate(ret, -1, NULL))
return ret;
else
{
g_warning("g_utf8_validate() failed for converted string in cd_chardet_to_utf8: '%s'", ret);
g_free(ret);
return NULL;
}
}
return NULL; /* If we have no idea, return NULL. */
}
void chardet_init(void)
{
str_to_utf8 = cd_str_to_utf8;
chardet_to_utf8 = cd_chardet_to_utf8;
#ifdef USE_CHARDET
guess_init();
#endif
}
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