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/*
* util.c - implementation of Telepathy-SofiaSIP utilities
* Copyright (C) 2009, 2010 Nokia Corporation
* @author Mikhail Zabaluev <mikhail.zabaluev@nokia.com>
*
* This work is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This work 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "util.h"
#include <string.h>
static const guchar escape_table[256] =
{ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1,
/* Control characters except LF and CR.
* NOTE: null character is intentionally flagged */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x10 - 0x1f */
0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x22 == '"' */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, /* 0x5c == '\\' */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, /* 0x7f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };
/**
* tpsip_string_append_quoted:
* @buf: a #GString to append the quoted text to
* @text: text to append as a quoted string
*
* Appends to @buf the content of @text as a quoted string accordingly to SIP
* or MIME syntax.
*/
void
tpsip_string_append_quoted (GString *buf, const gchar *text)
{
const gchar *p;
gchar quoted_pair[2] = { '\\', };
g_string_append_c (buf, '"');
p = text;
while (*p)
{
const gchar *q;
/* Get the following text span to append verbatim */
for (q = p; !escape_table[(guchar) *q]; ++q)
{ /* do nothing */ }
g_string_append_len (buf, p, q - p);
if (*q == '\0')
break;
quoted_pair[1] = *q;
g_string_append_len (buf, quoted_pair, 2);
p = q + 1;
}
g_string_append_c (buf, '"');
}
/**
* tpsip_quote_string:
* @src: the source string
*
* Formats the content of @text as a quoted string accordingly to SIP
* or MIME syntax.
*
* Returns: a newly allocated quoted string.
* The string is to be freed with g_free().
*/
gchar *
tpsip_quote_string (const gchar *src)
{
GString *buf;
buf = g_string_sized_new (2);
tpsip_string_append_quoted (buf, src);
return g_string_free (buf, FALSE);
}
/**
* tpsip_unquote_string:
* @src: the quoted string, including the encompassing double quotes
* @len: length of the string @src in bytes,
* or -1 if the string is null-terminated
*
* Extracts text out of a quoted string literal accordingly to SIP
* or MIME syntax, unescaping characters preceded by backspaces.
*
* Returns: a newly allocated unquoted string.
* The string is to be freed with g_free().
*/
gchar *
tpsip_unquote_string (const gchar *src, gssize len)
{
gchar *res;
gchar *p;
gsize i;
g_return_val_if_fail (src != NULL, NULL);
if (len < 0)
len = strlen (src);
g_return_val_if_fail (len >= 2, NULL);
g_return_val_if_fail (src[0] == '"' && src[len - 1] == '"', NULL);
res = g_malloc (len - 2 + 1);
p = res;
for (i = 1; i < len - 1; ++i)
{
if (src[i] == '\\')
{
++i;
if (G_UNLIKELY (i == len - 1))
{
g_critical ("the quoted string is missing the termination quote, improperly escaped?");
return NULL;
}
}
*p++ = src[i];
}
*p = '\0';
return res;
}
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