/**
* g_hostname_to_ascii:
* @hostname: a valid UTF-8 or ASCII hostname
*
* Converts @hostname to its canonical ASCII form; an ASCII-only
* string containing no uppercase letters and not ending with a
* trailing dot.
*
* Return value: an ASCII hostname, which must be freed, or %NULL if
* @hostname is in some way invalid.
*
* Since: 2.22
**/
gchar *
g_hostname_to_ascii (const gchar *hostname)
{
gchar *name, *label, *p;
GString *out;
gssize llen, oldlen;
gboolean unicode;
label = name = nameprep (hostname, -1, &unicode);
if (!name || !unicode)
return name;
out = g_string_new (NULL);
do
{
unicode = FALSE;
for (p = label; *p && !idna_is_dot (p); p++)
{
if ((guchar)*p > 0x80)
unicode = TRUE;
}
oldlen = out->len;
llen = p - label;
if (unicode)
{
if (!strncmp (label, IDNA_ACE_PREFIX, IDNA_ACE_PREFIX_LEN))
goto fail;
g_string_append (out, IDNA_ACE_PREFIX);
if (!punycode_encode (label, llen, out))
goto fail;
}
else
g_string_append_len (out, label, llen);
if (out->len - oldlen > 63)
goto fail;
label += llen;
if (*label)
label = g_utf8_next_char (label);
if (*label)
g_string_append_c (out, '.');
}
while (*label);
g_free (name);
return g_string_free (out, FALSE);
fail:
g_free (name);
g_string_free (out, TRUE);
return NULL;
}
/**
* g_hostname_to_unicode:
* @hostname: a valid UTF-8 or ASCII hostname
*
* Converts @hostname to its canonical presentation form; a UTF-8
* string in Unicode normalization form C, containing no uppercase
* letters, no forbidden characters, and no ASCII-encoded segments,
* and not ending with a trailing dot.
*
* Of course if @hostname is not an internationalized hostname, then
* the canonical presentation form will be entirely ASCII.
*
* Return value: a UTF-8 hostname, which must be freed, or %NULL if
* @hostname is in some way invalid.
*
* Since: 2.22
**/
gchar *
g_hostname_to_unicode (const gchar *hostname)
{
GString *out;
gssize llen;
out = g_string_new (NULL);
do
{
llen = idna_end_of_label (hostname) - hostname;
if (!g_ascii_strncasecmp (hostname, IDNA_ACE_PREFIX, IDNA_ACE_PREFIX_LEN))
{
hostname += IDNA_ACE_PREFIX_LEN;
llen -= IDNA_ACE_PREFIX_LEN;
if (!punycode_decode (hostname, llen, out))
{
g_string_free (out, TRUE);
return NULL;
}
}
else
{
gboolean unicode;
gchar *canonicalized = nameprep (hostname, llen, &unicode);
if (!canonicalized)
{
g_string_free (out, TRUE);
return NULL;
}
g_string_append (out, canonicalized);
g_free (canonicalized);
}
hostname += llen;
if (*hostname)
hostname = g_utf8_next_char (hostname);
if (*hostname)
g_string_append_c (out, '.');
}
while (*hostname);
return g_string_free (out, FALSE);
}
/**
* g_hostname_to_unicode:
* @hostname: a valid UTF-8 or ASCII hostname
*
* Converts @hostname to its canonical presentation form; a UTF-8
* string in Unicode normalization form C, containing no uppercase
* letters, no forbidden characters, and no ASCII-encoded segments,
* and not ending with a trailing dot.
*
* Of course if @hostname is not an internationalized hostname, then
* the canonical presentation form will be entirely ASCII.
*
* Return value: a UTF-8 hostname, which must be freed, or %NULL if
* @hostname is in some way invalid.
*
* Since: 2.22
**/
gchar *
g_hostname_to_unicode (const gchar *hostname)
{
GString *out;
gssize llen;
out = g_string_new (NULL);
do
{
llen = strcspn (hostname, ".");
if (!g_ascii_strncasecmp (hostname, IDNA_ACE_PREFIX, IDNA_ACE_PREFIX_LEN))
{
hostname += IDNA_ACE_PREFIX_LEN;
llen -= IDNA_ACE_PREFIX_LEN;
if (!punycode_decode (hostname, llen, out))
{
g_string_free (out, TRUE);
return NULL;
}
}
else
{
gchar *canonicalized = nameprep (hostname, llen);
if (!canonicalized)
{
g_string_free (out, TRUE);
return NULL;
}
g_string_append (out, canonicalized);
g_free (canonicalized);
}
hostname += llen;
if (*hostname && *++hostname)
g_string_append_c (out, '.');
}
while (*hostname);
return g_string_free (out, FALSE);
}
