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/* libimap library.
* Copyright (C) 2003-2016 Pawel Salek.
*
* 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; either version 2, 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 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 <https://www.gnu.org/licenses/>.
*/
/* imap_quote_string: quote string according to IMAP rules:
* surround string with quotes, escape " and \ with \ */
#include "config.h"
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include "util.h"
#define SKIPWS(c) while (*(c) && isspace ((unsigned char) *(c))) c++;
gchar *
imap_quote_string(const gchar *src)
{
g_return_val_if_fail(src != NULL, NULL);
if ((strchr(src, '"') == NULL) && (strchr(src, '\\') == NULL)) {
/* no need to quote... */
return g_strdup(src);
} else {
GString *buf;
buf = g_string_sized_new(strlen(src + 3U));
g_string_append_c(buf, '"');
for (; *src != '\0'; src++) {
if ((*src == '"') || (*src == '\\')) {
g_string_append_c(buf, '\\');
}
g_string_append_c(buf, *src);
}
g_string_append_c(buf, '"');
return g_string_free(buf, FALSE);
}
}
/* imap_skip_atom: return index into string where next IMAP atom begins.
* see RFC for a definition of the atom. */
#define LIST_SPECIALS "%*"
#define QUOTED_SPECIALS "\"\\"
#define RESP_SPECIALS "]"
char*
imap_skip_atom(char *s)
{
static const char ATOM_SPECIALS[] =
"(){ " LIST_SPECIALS QUOTED_SPECIALS RESP_SPECIALS;
while (*s && !strchr(ATOM_SPECIALS,*s))
s++;
SKIPWS (s);
return s;
}
char*
imap_next_word(char *s)
{
int quoted = 0;
while (*s) {
if (*s == '\\') {
s++;
if (*s)
s++;
continue;
}
if (*s == '\"')
quoted = quoted ? 0 : 1;
if (!quoted && isspace(*s))
break;
s++;
}
SKIPWS (s);
return s;
}
/* ===================================================================
* UTF-7 conversion routines as in RFC 2192
* =================================================================== */
/* see RFC 3501, Section 5.1.3. Mailbox International Naming Convention:
* In modified UTF-7, printable US-ASCII characters, except for "&", represent themselves; that is, characters with octet values
* 0x20-0x25 and 0x27-0x7e. */
#define IS_VALID_ASCII(c) ((((c) >= '\x20') && ((c) <= '\x25')) || (((c) >= '\x27') && ((c) <= '\x7e')))
gchar *
imap_utf8_to_mailbox(const gchar *mbox)
{
GString *buffer;
const gchar *next_in;
buffer = g_string_sized_new(strlen(mbox)); /* sufficient size for ASCII only */
next_in = mbox;
while (*next_in != '\0') {
if (IS_VALID_ASCII(*next_in)) {
g_string_append_c(buffer, *next_in++);
} else if (*next_in == '&') {
g_string_append(buffer, "&-"); /* see RFC 3501, Section 5.1.3 */
next_in++;
} else {
const gchar *next_ascii;
gchar *utf7;
gsize utf7len;
next_ascii = g_utf8_next_char(next_in);
while ((*next_ascii != '\0') && !IS_VALID_ASCII(*next_ascii)) {
next_ascii = g_utf8_next_char(next_ascii);
}
utf7 = g_convert(next_in, next_ascii - next_in, "utf7", "utf8", NULL, &utf7len, NULL);
if (utf7 != NULL) {
gsize n;
utf7[0] = '&'; /* see RFC 3501, Section 5.1.3 */
for (n = 1U; n < utf7len; n++) {
if (utf7[n] == '/') { /* see RFC 3501, Section 5.1.3 */
utf7[n] = ',';
}
}
g_string_append_len(buffer, utf7, utf7len);
g_free(utf7);
}
next_in = next_ascii;
}
}
return g_string_free(buffer, FALSE);
}
gchar *
imap_mailbox_to_utf8(const gchar *mbox)
{
GString *buffer;
const gchar *next_in;
buffer = g_string_sized_new(strlen(mbox)); /* always sufficiently long */
next_in = mbox;
while (*next_in != '\0') {
if (*next_in == '&') {
if (next_in[1] == '-') { /* see RFC 3501, Section 5.1.3 */
g_string_append_c(buffer, '&');
next_in = &next_in[2];
} else {
gchar *utf7buf;
gchar *next_utf7;
gchar *utf8;
gsize utf8len;
utf7buf = g_malloc0(strlen(next_in) + 1U);
utf7buf[0] = '+'; /* RFC 2152 shift character */
next_in++;
for (next_utf7 = &utf7buf[1]; (*next_in != '\0') && (*next_in != '-'); next_in++) {
if (*next_in == ',') { /* see RFC 3501, Section 5.1.3 */
*next_utf7++ = '/';
} else {
*next_utf7++ = *next_in;
}
}
*next_utf7 = *next_in;
if (*next_in == '-') {
next_in++;
}
utf8 = g_convert(utf7buf, -1, "utf8", "utf7", NULL, &utf8len, NULL);
if (utf8 != NULL) {
g_string_append_len(buffer, utf8, utf8len);
g_free(utf8);
}
g_free(utf7buf);
}
} else {
g_string_append_c(buffer, *next_in++);
}
}
return g_string_free(buffer, FALSE);
}
#if 0
int main(int argc, char *argv[])
{
int i;
for(i=1; i<argc; i++) {
char *mbx = imap_utf8_to_mailbox(argv[i]);
char *utf8 = imap_mailbox_to_utf8(mbx);
if (!mbx || !utf8)
continue;
printf("orig='%s' mbx='%s' back='%s'\n", argv[i], mbx, utf8);
free(mbx); free(utf8);
}
return 0;
}
#endif
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