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/* Copyright (c) 2002-2009 Dovecot Sieve authors, see the included COPYING file
*/
#include "lib.h"
#include "str.h"
#include "managesieve-parser.h"
#include "managesieve-quote.h"
/* Turn the value string into a valid MANAGESIEVE string or literal, no matter
* what. QUOTED-SPECIALS are escaped, but any invalid (UTF-8) character
* is simply removed. Linebreak characters are not considered invalid, but
* they do force the generation of a string literal.
*/
void managesieve_quote_append(string_t *str, const unsigned char *value,
size_t value_len, bool compress_lwsp)
{
size_t i, extra = 0;
bool
last_lwsp = TRUE,
literal = FALSE,
modify = FALSE,
escape = FALSE;
int utf8_len;
if (value == NULL) {
str_append(str, "\"\"");
return;
}
if (value_len == (size_t)-1)
value_len = strlen((const char *) value);
for (i = 0; i < value_len; i++) {
switch (value[i]) {
case ' ':
case '\t':
if (last_lwsp && compress_lwsp) {
modify = TRUE;
extra++;
}
last_lwsp = TRUE;
break;
case '"':
case '\\':
escape = TRUE;
last_lwsp = FALSE;
break;
case 13:
case 10:
literal = TRUE;
last_lwsp = TRUE;
break;
default:
/* Enforce valid UTF-8
*/
if ( (utf8_len=UTF8_LEN(value[i])) == 0 ) {
modify = TRUE;
extra++;
break;
}
if ( utf8_len > 1 ) {
int c = utf8_len - 1;
if ( (i+utf8_len-1) >= value_len ) {
/* Value ends in the middle of a UTF-8 character;
* Kill the partial UTF-8 character
*/
extra += i + utf8_len - value_len;
modify = TRUE;
break;
}
/* Parse the series of UTF8_1 characters */
for (i++; c > 0; c--, i++ ) {
if (!IS_UTF8_1(value[i])) {
extra += utf8_len - c;
modify = TRUE;
break;
}
}
}
last_lwsp = FALSE;
}
}
if (!literal) {
/* no linebreak chars, return as (escaped) "string" */
str_append_c(str, '"');
} else {
/* return as literal */
str_printfa(str, "{%"PRIuSIZE_T"}\r\n", value_len - extra);
}
if (!modify && (literal || !escape))
str_append_n(str, value, value_len);
else {
last_lwsp = TRUE;
for (i = 0; i < value_len; i++) {
switch (value[i]) {
case '"':
case '\\':
last_lwsp = FALSE;
if (!literal)
str_append_c(str, '\\');
str_append_c(str, value[i]);
break;
case ' ':
case '\t':
if (!last_lwsp || !compress_lwsp)
str_append_c(str, ' ');
last_lwsp = TRUE;
break;
case 13:
case 10:
last_lwsp = TRUE;
str_append_c(str, value[i]);
break;
default:
/* Enforce valid UTF-8
*/
if ( (utf8_len=UTF8_LEN(value[i])) == 0 )
break;
if ( utf8_len > 1 ) {
int c = utf8_len - 1;
int j;
if ( (i+utf8_len-1) >= value_len ) {
/* Value ends in the middle of a UTF-8 character;
* Kill the partial character
*/
i = value_len;
break;
}
/* Parse the series of UTF8_1 characters */
for (j = i+1; c > 0; c--, j++ ) {
if (!IS_UTF8_1(value[j])) {
/* Skip until after this erroneous character */
i = j;
break;
}
}
/* Append the UTF-8 character. Last octet is done later */
c = utf8_len - 1;
for (; c > 0; c--, i++ )
str_append_c(str, value[i]);
}
last_lwsp = FALSE;
str_append_c(str, value[i]);
break;
}
}
}
if (!literal)
str_append_c(str, '"');
}
char *managesieve_quote(pool_t pool, const unsigned char *value, size_t value_len)
{
string_t *str;
char *ret;
if (value == NULL)
return "\"\"";
T_BEGIN {
str = t_str_new(value_len + MAX_INT_STRLEN + 5);
managesieve_quote_append(str, value, value_len, TRUE);
ret = p_strndup(pool, str_data(str), str_len(str));
} T_END;
return ret;
}
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