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/*
* Copyright (C) 2000 Helix Code Inc.
*
* Authors: Michael Zucchi <notzed@helixcode.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License
* as published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <unicode.h>
#include <string.h>
#include <errno.h>
#include "camel-mime-filter-charset.h"
static void camel_mime_filter_charset_class_init (CamelMimeFilterCharsetClass *klass);
static void camel_mime_filter_charset_init (CamelMimeFilterCharset *obj);
static void camel_mime_filter_charset_finalize (CamelObject *o);
static CamelMimeFilterClass *camel_mime_filter_charset_parent;
CamelType
camel_mime_filter_charset_get_type (void)
{
static CamelType type = CAMEL_INVALID_TYPE;
if (type == CAMEL_INVALID_TYPE) {
type = camel_type_register (camel_mime_filter_get_type (), "CamelMimeFilterCharset",
sizeof (CamelMimeFilterCharset),
sizeof (CamelMimeFilterCharsetClass),
(CamelObjectClassInitFunc) camel_mime_filter_charset_class_init,
NULL,
(CamelObjectInitFunc) camel_mime_filter_charset_init,
(CamelObjectFinalizeFunc) camel_mime_filter_charset_finalize);
}
return type;
}
static void
camel_mime_filter_charset_finalize(CamelObject *o)
{
CamelMimeFilterCharset *f = (CamelMimeFilterCharset *)o;
g_free(f->from);
g_free(f->to);
if (f->ic != (unicode_iconv_t)-1) {
unicode_iconv_close(f->ic);
f->ic = (unicode_iconv_t) -1;
}
}
static void
reset(CamelMimeFilter *mf)
{
CamelMimeFilterCharset *f = (CamelMimeFilterCharset *)mf;
char buf[16];
char *buffer;
int outlen = 16;
/* what happens with the output bytes if this resets the state? */
if (f->ic != (unicode_iconv_t) -1) {
buffer = buf;
unicode_iconv(f->ic, NULL, 0, &buffer, &outlen);
}
}
static void
complete(CamelMimeFilter *mf, char *in, size_t len, size_t prespace, char **out, size_t *outlenptr, size_t *outprespace)
{
CamelMimeFilterCharset *f = (CamelMimeFilterCharset *)mf;
int converted;
const char *inbuf;
char *outbuf;
int inlen, outlen;
if (f->ic == (unicode_iconv_t) -1) {
goto donothing;
}
/* FIXME: there's probably a safer way to size this ...? */
/* We could always resize if we run out of room in outbuf (but it'd be nice not
to have to) */
camel_mime_filter_set_size(mf, len*5, FALSE);
inbuf = in;
inlen = len;
outbuf = mf->outbuf;
outlen = mf->outsize;
if (inlen>0) {
converted = unicode_iconv(f->ic, &inbuf, &inlen, &outbuf, &outlen);
if (converted == -1) {
if (errno != EINVAL) {
g_warning("error occured converting: %s", strerror(errno));
goto donothing;
}
}
if (inlen>0) {
g_warning("Output lost in character conversion, invalid sequence encountered?");
}
}
/* this 'resets' the output stream, returning back to the initial
shift state for multishift charactersets */
converted = unicode_iconv(f->ic, NULL, 0, &outbuf, &outlen);
if (converted == -1) {
g_warning("Conversion failed to complete: %s", strerror(errno));
}
*out = mf->outbuf;
*outlenptr = mf->outsize - outlen;
*outprespace = mf->outpre;
return;
donothing:
*out = in;
*outlenptr = len;
*outprespace = prespace;
}
static void
filter(CamelMimeFilter *mf, char *in, size_t len, size_t prespace, char **out, size_t *outlenptr, size_t *outprespace)
{
CamelMimeFilterCharset *f = (CamelMimeFilterCharset *)mf;
int converted;
const char *inbuf;
char *outbuf;
int inlen, outlen;
if (f->ic == (unicode_iconv_t) -1) {
goto donothing;
}
/* FIXME: there's probably a safer way to size this ...? */
camel_mime_filter_set_size(mf, len*5, FALSE);
inbuf = in;
inlen = len;
outbuf = mf->outbuf;
outlen = mf->outsize;
converted = unicode_iconv(f->ic, &inbuf, &inlen, &outbuf, &outlen);
if (converted == -1) {
if (errno != EINVAL) {
g_warning("error occured converting: %s", strerror(errno));
goto donothing;
}
}
/*
NOTE: This assumes EINVAL only occurs because we ran out of
bytes for a multibyte sequence, if not, we're in trouble.
*/
if (inlen>0) {
camel_mime_filter_backup(mf, inbuf, inlen);
}
*out = mf->outbuf;
*outlenptr = mf->outsize - outlen;
*outprespace = mf->outpre;
return;
donothing:
*out = in;
*outlenptr = len;
*outprespace = prespace;
}
static void
camel_mime_filter_charset_class_init (CamelMimeFilterCharsetClass *klass)
{
CamelMimeFilterClass *filter_class = (CamelMimeFilterClass *) klass;
camel_mime_filter_charset_parent = CAMEL_MIME_FILTER_CLASS (camel_type_get_global_classfuncs (camel_mime_filter_get_type ()));
filter_class->reset = reset;
filter_class->filter = filter;
filter_class->complete = complete;
}
static void
camel_mime_filter_charset_init (CamelMimeFilterCharset *obj)
{
obj->ic = (unicode_iconv_t)-1;
}
/**
* camel_mime_filter_charset_new:
*
* Create a new CamelMimeFilterCharset object.
*
* Return value: A new CamelMimeFilterCharset widget.
**/
CamelMimeFilterCharset *
camel_mime_filter_charset_new (void)
{
CamelMimeFilterCharset *new = CAMEL_MIME_FILTER_CHARSET ( camel_object_new (camel_mime_filter_charset_get_type ()));
return new;
}
CamelMimeFilterCharset *
camel_mime_filter_charset_new_convert(const char *from_charset, const char *to_charset)
{
CamelMimeFilterCharset *new = CAMEL_MIME_FILTER_CHARSET ( camel_object_new (camel_mime_filter_charset_get_type ()));
new->ic = unicode_iconv_open(to_charset, from_charset);
if (new->ic == (unicode_iconv_t) -1) {
g_warning("Cannot create charset conversion from %s to %s: %s", from_charset, to_charset, strerror(errno));
camel_object_unref((CamelObject *)new);
new = NULL;
} else {
new->from = g_strdup(from_charset);
new->to = g_strdup(to_charset);
}
return new;
}
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