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/*
LibRCC - interface to enca library
Copyright (C) 2005-2008 Suren A. Chilingaryan <csa@dside.dyndns.org>
This program is free software; you can redistribute it and/or modify it
under the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation.
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, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <stdio.h>
#include <string.h>
#include "internal.h"
#include "plugin.h"
#include "engine.h"
#include "rccconfig.h"
#include "rccenca.h"
#ifdef RCC_ENCA_SUPPORT
# ifdef RCC_ENCA_DYNAMIC
# include "fake_enca.h"
# else
# include <enca.h>
# endif /* RCC_ENCA_DYNAMIC */
#endif /* RCC_ENCA_SUPPORT */
#ifdef RCC_ENCA_DYNAMIC
static rcc_library_handle enca_handle = NULL;
#endif /* RCC_ENCA_DYNAMIC */
static rcc_engine *enca_engines = NULL;
/* CORK, KEYBCS2 is missing */
rcc_enca_corrections rcc_enca_missing_corrections[] = {
{ "be", "KOI8-UNI", "ISO-IR-111" },
{ NULL, "macce", "MACCENTRALEUROPE" },
{ "zh", "HZ", "HZ" },
{ "sk", "KOI-8_CS_2", "CSKOI8R" },
{ NULL, NULL, NULL }
};
rcc_enca_corrections rcc_enca_error_corrections[] = {
{ NULL, "ECMA-cyrillic", "ISO-IR-111" },
{ NULL, NULL, NULL }
};
static const char *rccEncaGetCorrection(const char *lang, const char *charset) {
int i;
for (i=0;rcc_enca_error_corrections[i].enca_charset;i++) {
if (((!rcc_enca_error_corrections[i].lang)||((lang)&&(!strcmp(lang, rcc_enca_error_corrections[i].lang))))&&(!strcmp(charset, rcc_enca_error_corrections[i].enca_charset)))
return rcc_enca_error_corrections[i].iconv_charset;
}
return charset;
}
static const char *rccEncaGetMissing(const char *lang, const char *charset) {
int i;
for (i=0;rcc_enca_missing_corrections[i].enca_charset;i++) {
if (((!rcc_enca_missing_corrections[i].lang)||((lang)&&(!strcmp(lang, rcc_enca_missing_corrections[i].lang))))&&(!strcmp(charset, rcc_enca_missing_corrections[i].enca_charset)))
return rcc_enca_missing_corrections[i].iconv_charset;
}
return charset;
}
rcc_engine_internal rccEncaInitContext(rcc_engine_context ctx) {
#ifdef RCC_ENCA_SUPPORT
EncaAnalyser enca;
if ((!ctx)||(!ctx->config)) return NULL;
enca = enca_analyser_alloc(rccConfigGetLanguageName(ctx->config));
if (!enca) return NULL;
enca_set_threshold(enca, 1);
enca_set_multibyte(enca, 1);
enca_set_ambiguity(enca, 1);
enca_set_garbage_test(enca, 0);
enca_set_filtering(enca, 0);
enca_set_significant(enca,1);
enca_set_termination_strictness(enca,0);
return (rcc_engine_internal)enca;
#else /* RCC_ENCA_SUPPORT */
return NULL;
#endif /* RCC_ENCA_SUPPORT */
}
void rccEncaFreeContext(rcc_engine_context ctx) {
rcc_engine_internal internal;
#ifdef RCC_ENCA_SUPPORT
internal = rccEngineGetInternal(ctx);
if (internal)
enca_analyser_free(internal);
#endif /* RCC_ENCA_SUPPORT */
}
rcc_autocharset_id rccEnca(rcc_engine_context ctx, const char *buf, int len) {
#ifdef RCC_ENCA_SUPPORT
rcc_engine_internal internal;
const char *charset;
EncaEncoding ee;
internal = rccEngineGetInternal(ctx);
if ((!internal)||(!buf)) return (rcc_charset_id)-1;
ee = enca_analyse_const((EncaAnalyser)ctx->internal,(const unsigned char*)buf,len?len:strlen(buf));
if (ee.charset<0) return (rcc_charset_id)-1;
charset = enca_charset_name(ee.charset, ENCA_NAME_STYLE_ICONV);
if (charset) {
charset = rccEncaGetCorrection(rccEngineGetLanguage(ctx)->sn, charset);
} else {
charset = rccEncaGetMissing(rccEngineGetLanguage(ctx)->sn, enca_charset_name(ee.charset, ENCA_NAME_STYLE_ENCA));
}
return rccEngineGetAutoCharsetByName(ctx, charset);
#else /* RCC_ENCA_SUPPORT */
return (rcc_charset_id)-1;
#endif /* RCC_ENCA_SUPPORT */
}
rcc_engine rcc_enca_engine = {
"Enca Library", &rccEncaInitContext, &rccEncaFreeContext, &rccEnca, {"UTF-8", NULL}
};
static int rccEncaLibraryLoad() {
#ifdef RCC_ENCA_DYNAMIC
if (enca_handle) return 0;
enca_handle = rccLibraryOpen(RCC_ENCA_LIB);
if (!enca_handle) return -1;
enca_set_multibyte=rccLibraryFind(enca_handle,"enca_set_multibyte");
enca_set_interpreted_surfaces=rccLibraryFind(enca_handle,"enca_set_interpreted_surfaces");
enca_set_ambiguity=rccLibraryFind(enca_handle,"enca_set_ambiguity");
enca_set_filtering=rccLibraryFind(enca_handle,"enca_set_filtering");
enca_set_garbage_test=rccLibraryFind(enca_handle,"enca_set_garbage_test");
enca_set_termination_strictness=rccLibraryFind(enca_handle,"enca_set_termination_strictness");
enca_set_significant=rccLibraryFind(enca_handle,"enca_set_significant");
enca_set_threshold=rccLibraryFind(enca_handle,"enca_set_threshold");
enca_charset_name=rccLibraryFind(enca_handle,"enca_charset_name");
enca_get_language_charsets=rccLibraryFind(enca_handle,"enca_get_language_charsets");
enca_analyser_alloc=rccLibraryFind(enca_handle,"enca_analyser_alloc");
enca_analyser_free=rccLibraryFind(enca_handle,"enca_analyser_free");
enca_analyse_const=rccLibraryFind(enca_handle,"enca_analyse_const");
if ((!enca_set_multibyte)||(!enca_set_interpreted_surfaces)||(!enca_set_ambiguity)||
(!enca_set_filtering)||(!enca_set_garbage_test)||(!enca_set_termination_strictness)||
(!enca_set_significant)||(!enca_set_threshold)||(!enca_charset_name)||
(!enca_get_language_charsets)||(!enca_analyser_alloc)||(!enca_analyser_free)||
(!enca_analyse_const)) {
rccLibraryClose(enca_handle);
enca_handle = NULL;
# ifdef RCC_DEBUG
perror( "rccEnca. Incomplete function set in library" );
# endif /* RCC_DEBUG */
return -1;
}
#endif /* RCC_ENCA_DYNAMIC */
return 0;
}
static void rccEncaLibraryUnload() {
#ifdef RCC_ENCA_DYNAMIC
if (enca_handle) {
rccLibraryClose(enca_handle);
enca_handle = NULL;
}
#endif /* RCC_ENCA_DYNAMIC */
}
int rccEncaInit() {
int err;
unsigned int i,j,k,l;
rcc_engine **engines;
int *charsets;
size_t n_charsets;
const char *charset;
#ifdef RCC_ENCA_SUPPORT
if (enca_engines) return 0;
for (i=0;rcc_default_languages[i].sn;i++);
enca_engines = (rcc_engine*)malloc(i*sizeof(rcc_engine));
if (!enca_engines) return -1;
err = rccEncaLibraryLoad();
if (err) return 0;
for (i=0;rcc_default_languages[i].sn;i++) {
engines = rcc_default_languages[i].engines;
for (j=0;engines[j];j++)
if (j >= RCC_MAX_ENGINES) continue;
if (strlen(rcc_default_languages[i].sn)==2)
charsets = enca_get_language_charsets(rcc_default_languages[i].sn, &n_charsets);
else
charsets = NULL;
if (charsets) {
memcpy(enca_engines+i, &rcc_enca_engine, sizeof(rcc_engine));
for (k=0;enca_engines[i].charsets[k];k++);
if (n_charsets+k>=RCC_MAX_CHARSETS) n_charsets = RCC_MAX_CHARSETS-k;
for (l=0;l<n_charsets;l++) {
// Enca bug, STYLE_ICONV return's a lot of NULL's
charset = enca_charset_name(charsets[l], ENCA_NAME_STYLE_ICONV);
if (charset) {
charset = rccEncaGetCorrection(rcc_default_languages[i].sn, charset);
} else {
charset = rccEncaGetMissing(rcc_default_languages[i].sn, enca_charset_name(charsets[l], ENCA_NAME_STYLE_ENCA));
}
enca_engines[i].charsets[k++] = charset;
}
enca_engines[j].charsets[k] = NULL;
engines[j] = enca_engines + i;
engines[j+1] = NULL;
free(charsets);
}
}
#endif /* RCC_ENCA_SUPPORT */
return 0;
}
void rccEncaFree() {
#ifdef RCC_ENCA_SUPPORT
rccEncaLibraryUnload();
if (enca_engines) {
free(enca_engines);
enca_engines = NULL;
}
#endif /* RCC_ENCA_SUPPORT */
}
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