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/*
* charset.c
* Copyright 2013 John Lindgren
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions, and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions, and the following disclaimer in the documentation
* provided with the distribution.
*
* This software is provided "as is" and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising from
* the use of this software.
*/
#include "audstrings.h"
#include "internal.h"
#include <errno.h>
#include <iconv.h>
#include <string.h>
#include <new>
#include <glib.h>
#include "libguess/libguess.h"
#include "hook.h"
#include "index.h"
#include "runtime.h"
#include "tinylock.h"
EXPORT StringBuf str_convert (const char * str, int len, const char * from_charset,
const char * to_charset)
{
iconv_t conv = iconv_open (to_charset, from_charset);
if (conv == (iconv_t) -1)
return StringBuf ();
if (len < 0)
len = strlen (str);
StringBuf buf (-1);
size_t inbytesleft = len;
size_t outbytesleft = buf.len ();
ICONV_CONST char * in = (ICONV_CONST char *) str;
char * out = buf;
errno = 0;
size_t ret = iconv (conv, & in, & inbytesleft, & out, & outbytesleft);
if (ret == (size_t) -1 && errno == E2BIG)
throw std::bad_alloc ();
iconv_close (conv);
if (ret == (size_t) -1 || inbytesleft)
return StringBuf ();
buf.resize (buf.len () - outbytesleft);
return buf;
}
static void whine_locale (const char * str, int len, const char * dir, const char * charset)
{
if (len < 0)
AUDWARN ("Cannot convert %s locale (%s): %s\n", dir, charset, str);
else
AUDWARN ("Cannot convert %s locale (%s): %.*s\n", dir, charset, len, str);
}
EXPORT StringBuf str_from_locale (const char * str, int len)
{
const char * charset;
if (g_get_charset (& charset))
{
/* locale is UTF-8 */
if (! g_utf8_validate (str, len, nullptr))
{
whine_locale (str, len, "from", "UTF-8");
return StringBuf ();
}
return str_copy (str, len);
}
else
{
StringBuf utf8 = str_convert (str, len, charset, "UTF-8");
if (! utf8)
whine_locale (str, len, "from", charset);
return utf8;
}
}
EXPORT StringBuf str_to_locale (const char * str, int len)
{
const char * charset;
if (g_get_charset (& charset))
{
/* locale is UTF-8 */
return str_copy (str, len);
}
else
{
StringBuf local = str_convert (str, len, "UTF-8", charset);
if (! local)
whine_locale (str, len, "to", charset);
return local;
}
}
static TinyRWLock settings_lock;
static String detect_region;
static Index<String> fallback_charsets;
static void set_charsets (const char * region, const char * fallbacks)
{
tiny_lock_write (& settings_lock);
detect_region = String (region);
if (fallbacks)
fallback_charsets = str_list_to_index (fallbacks, ", ");
else
fallback_charsets.clear ();
tiny_unlock_write (& settings_lock);
}
static StringBuf convert_to_utf8_locked (const char * str, int len)
{
if (len < 0)
len = strlen (str);
if (detect_region)
{
/* prefer libguess-detected charset */
const char * detected = libguess_determine_encoding (str, len, detect_region);
if (detected)
{
StringBuf utf8 = str_convert (str, len, detected, "UTF-8");
if (utf8)
return utf8;
}
}
/* try user-configured fallbacks */
for (const String & fallback : fallback_charsets)
{
StringBuf utf8 = str_convert (str, len, fallback, "UTF-8");
if (utf8)
return utf8;
}
/* try system locale last (this one will print a warning if it fails) */
return str_from_locale (str, len);
}
EXPORT StringBuf str_to_utf8 (const char * str, int len)
{
/* check whether already UTF-8 */
if (g_utf8_validate (str, len, nullptr))
return str_copy (str, len);
tiny_lock_read (& settings_lock);
StringBuf utf8 = convert_to_utf8_locked (str, len);
tiny_unlock_read (& settings_lock);
return utf8;
}
EXPORT StringBuf str_to_utf8 (StringBuf && str)
{
/* check whether already UTF-8 */
if (g_utf8_validate (str, str.len (), nullptr))
return std::move (str);
tiny_lock_read (& settings_lock);
str = convert_to_utf8_locked (str, str.len ());
tiny_unlock_read (& settings_lock);
return str.settle ();
}
static void chardet_update (void * = nullptr, void * = nullptr)
{
String region = aud_get_str (nullptr, "chardet_detector");
String fallbacks = aud_get_str (nullptr, "chardet_fallback");
set_charsets (region[0] ? (const char *) region : nullptr, fallbacks);
}
void chardet_init ()
{
chardet_update ();
hook_associate ("set chardet_detector", chardet_update, nullptr);
hook_associate ("set chardet_fallback", chardet_update, nullptr);
}
void chardet_cleanup ()
{
hook_dissociate ("set chardet_detector", chardet_update);
hook_dissociate ("set chardet_fallback", chardet_update);
set_charsets (nullptr, nullptr);
}
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