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1 office 1 /* GIO - GLib Input, Output and Streaming Library
2 *
3 * Copyright (C) 2006-2007 Red Hat, Inc.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General
16 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 *
18 * Author: Alexander Larsson <alexl@redhat.com>
19 */
20  
21 #include "config.h"
22  
23 #include "gurifuncs.h"
24  
25 #include <glib/gstrfuncs.h>
26 #include <glib/gmessages.h>
27 #include <glib/gstring.h>
28 #include <glib/gmem.h>
29  
30 #include <string.h>
31  
32 #include "config.h"
33  
34 /**
35 * SECTION:gurifuncs
36 * @title: URI Functions
37 * @short_description: manipulating URIs
38 *
39 * Functions for manipulating Universal Resource Identifiers (URIs) as
40 * defined by
41 * [RFC 3986](http://www.ietf.org/rfc/rfc3986.txt).
42 * It is highly recommended that you have read and
43 * understand RFC 3986 for understanding this API.
44 */
45  
46 static int
47 unescape_character (const char *scanner)
48 {
49 int first_digit;
50 int second_digit;
51  
52 first_digit = g_ascii_xdigit_value (*scanner++);
53 if (first_digit < 0)
54 return -1;
55  
56 second_digit = g_ascii_xdigit_value (*scanner++);
57 if (second_digit < 0)
58 return -1;
59  
60 return (first_digit << 4) | second_digit;
61 }
62  
63 /**
64 * g_uri_unescape_segment:
65 * @escaped_string: (allow-none): A string, may be %NULL
66 * @escaped_string_end: (allow-none): Pointer to end of @escaped_string, may be %NULL
67 * @illegal_characters: (allow-none): An optional string of illegal characters not to be allowed, may be %NULL
68 *
69 * Unescapes a segment of an escaped string.
70 *
71 * If any of the characters in @illegal_characters or the character zero appears
72 * as an escaped character in @escaped_string then that is an error and %NULL
73 * will be returned. This is useful it you want to avoid for instance having a
74 * slash being expanded in an escaped path element, which might confuse pathname
75 * handling.
76 *
77 * Returns: an unescaped version of @escaped_string or %NULL on error.
78 * The returned string should be freed when no longer needed. As a
79 * special case if %NULL is given for @escaped_string, this function
80 * will return %NULL.
81 *
82 * Since: 2.16
83 **/
84 char *
85 g_uri_unescape_segment (const char *escaped_string,
86 const char *escaped_string_end,
87 const char *illegal_characters)
88 {
89 const char *in;
90 char *out, *result;
91 gint character;
92  
93 if (escaped_string == NULL)
94 return NULL;
95  
96 if (escaped_string_end == NULL)
97 escaped_string_end = escaped_string + strlen (escaped_string);
98  
99 result = g_malloc (escaped_string_end - escaped_string + 1);
100  
101 out = result;
102 for (in = escaped_string; in < escaped_string_end; in++)
103 {
104 character = *in;
105  
106 if (*in == '%')
107 {
108 in++;
109  
110 if (escaped_string_end - in < 2)
111 {
112 /* Invalid escaped char (to short) */
113 g_free (result);
114 return NULL;
115 }
116  
117 character = unescape_character (in);
118  
119 /* Check for an illegal character. We consider '\0' illegal here. */
120 if (character <= 0 ||
121 (illegal_characters != NULL &&
122 strchr (illegal_characters, (char)character) != NULL))
123 {
124 g_free (result);
125 return NULL;
126 }
127  
128 in++; /* The other char will be eaten in the loop header */
129 }
130 *out++ = (char)character;
131 }
132  
133 *out = '\0';
134  
135 return result;
136 }
137  
138 /**
139 * g_uri_unescape_string:
140 * @escaped_string: an escaped string to be unescaped.
141 * @illegal_characters: (allow-none): a string of illegal characters not to be
142 * allowed, or %NULL.
143 *
144 * Unescapes a whole escaped string.
145 *
146 * If any of the characters in @illegal_characters or the character zero appears
147 * as an escaped character in @escaped_string then that is an error and %NULL
148 * will be returned. This is useful it you want to avoid for instance having a
149 * slash being expanded in an escaped path element, which might confuse pathname
150 * handling.
151 *
152 * Returns: an unescaped version of @escaped_string. The returned string
153 * should be freed when no longer needed.
154 *
155 * Since: 2.16
156 **/
157 char *
158 g_uri_unescape_string (const char *escaped_string,
159 const char *illegal_characters)
160 {
161 return g_uri_unescape_segment (escaped_string, NULL, illegal_characters);
162 }
163  
164 /**
165 * g_uri_parse_scheme:
166 * @uri: a valid URI.
167 *
168 * Gets the scheme portion of a URI string. RFC 3986 decodes the scheme as:
169 * |[
170 * URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
171 * ]|
172 * Common schemes include "file", "http", "svn+ssh", etc.
173 *
174 * Returns: The "Scheme" component of the URI, or %NULL on error.
175 * The returned string should be freed when no longer needed.
176 *
177 * Since: 2.16
178 **/
179 char *
180 g_uri_parse_scheme (const char *uri)
181 {
182 const char *p;
183 char c;
184  
185 g_return_val_if_fail (uri != NULL, NULL);
186  
187 /* From RFC 3986 Decodes:
188 * URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
189 */
190  
191 p = uri;
192  
193 /* Decode scheme:
194 scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
195 */
196  
197 if (!g_ascii_isalpha (*p))
198 return NULL;
199  
200 while (1)
201 {
202 c = *p++;
203  
204 if (c == ':')
205 break;
206  
207 if (!(g_ascii_isalnum(c) ||
208 c == '+' ||
209 c == '-' ||
210 c == '.'))
211 return NULL;
212 }
213  
214 return g_strndup (uri, p - uri - 1);
215 }
216  
217 /**
218 * g_uri_escape_string:
219 * @unescaped: the unescaped input string.
220 * @reserved_chars_allowed: (allow-none): a string of reserved characters that
221 * are allowed to be used, or %NULL.
222 * @allow_utf8: %TRUE if the result can include UTF-8 characters.
223 *
224 * Escapes a string for use in a URI.
225 *
226 * Normally all characters that are not "unreserved" (i.e. ASCII alphanumerical
227 * characters plus dash, dot, underscore and tilde) are escaped.
228 * But if you specify characters in @reserved_chars_allowed they are not
229 * escaped. This is useful for the "reserved" characters in the URI
230 * specification, since those are allowed unescaped in some portions of
231 * a URI.
232 *
233 * Returns: an escaped version of @unescaped. The returned string should be
234 * freed when no longer needed.
235 *
236 * Since: 2.16
237 **/
238 char *
239 g_uri_escape_string (const char *unescaped,
240 const char *reserved_chars_allowed,
241 gboolean allow_utf8)
242 {
243 GString *s;
244  
245 g_return_val_if_fail (unescaped != NULL, NULL);
246  
247 s = g_string_sized_new (strlen (unescaped) + 10);
248  
249 g_string_append_uri_escaped (s, unescaped, reserved_chars_allowed, allow_utf8);
250  
251 return g_string_free (s, FALSE);
252 }