diff options
Diffstat (limited to 'camel/camel-mime-filter-charset.c')
-rw-r--r-- | camel/camel-mime-filter-charset.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/camel/camel-mime-filter-charset.c b/camel/camel-mime-filter-charset.c new file mode 100644 index 0000000000..eb9db60802 --- /dev/null +++ b/camel/camel-mime-filter-charset.c @@ -0,0 +1,243 @@ +/* + * 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 CamelMimeFilterClass *camel_mime_filter_charset_parent; + +enum SIGNALS { + LAST_SIGNAL +}; + +static guint signals[LAST_SIGNAL] = { 0 }; + +guint +camel_mime_filter_charset_get_type (void) +{ + static guint type = 0; + + if (!type) { + GtkTypeInfo type_info = { + "CamelMimeFilterCharset", + sizeof (CamelMimeFilterCharset), + sizeof (CamelMimeFilterCharsetClass), + (GtkClassInitFunc) camel_mime_filter_charset_class_init, + (GtkObjectInitFunc) camel_mime_filter_charset_init, + (GtkArgSetFunc) NULL, + (GtkArgGetFunc) NULL + }; + + type = gtk_type_unique (camel_mime_filter_get_type (), &type_info); + } + + return type; +} + +static void +finalise(GtkObject *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; + } + + ((GtkObjectClass *)camel_mime_filter_charset_parent)->finalize (o); +} + +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; + char *inbuf, *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; + char *inbuf, *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) +{ + GtkObjectClass *object_class = (GtkObjectClass *) klass; + CamelMimeFilterClass *filter_class = (CamelMimeFilterClass *) klass; + + camel_mime_filter_charset_parent = gtk_type_class (camel_mime_filter_get_type ()); + + object_class->finalize = finalise; + + filter_class->reset = reset; + filter_class->filter = filter; + filter_class->complete = complete; + + gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL); +} + +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 ( gtk_type_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 ( gtk_type_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)); + gtk_object_unref((GtkObject *)new); + new = NULL; + } else { + new->from = g_strdup(from_charset); + new->to = g_strdup(to_charset); + } + return new; +} |