5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 2002 - 2005 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; version 2 of the License.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
20 /****h* silcutil/SILC String Utilities
24 * String manipulation utility routines. These routines provides
25 * various helper functions for encoding, decoding and otherwise
33 /****d* silcutil/SilcStrUtilAPI/SilcStringEncoding
37 * typedef enum { ... } SilcStringEncoding;
41 * String encoding definitions used with various string manipulation
42 * routines. By default, applications are suggested to use
43 * SILC_STRING_LOCALE since it encodes and decodes correctly according
44 * to local system language and character set (locale).
49 SILC_STRING_ASCII = 0, /* Any 8 bit ASCII encoding (default) */
50 SILC_STRING_ASCII_ESC = 1, /* 7 bit ASCII (>0x7f escaped) */
51 SILC_STRING_BMP = 2, /* 16 bit, UCS-2, BMP, ISO/IEC 10646 */
52 SILC_STRING_BMP_LSB = 3, /* BMP, least significant byte first */
53 SILC_STRING_UNIVERSAL = 4, /* 32 bit, UCS-4, Universal, ISO/IEC 10646 */
54 SILC_STRING_UNIVERSAL_LSB = 5, /* Universal, least significant byte first */
55 SILC_STRING_LOCALE = 6, /* A locale specific conversion on
56 those platforms that support iconv().
57 Fallback is SILC_STRING_ASCII. */
58 SILC_STRING_UTF8 = 7, /* UTF-8 encoding */
59 SILC_STRING_PRINTABLE = 8, /* Printable ASCII (no escaping) */
60 SILC_STRING_VISIBLE = 9, /* Visible ASCII string */
61 SILC_STRING_TELETEX = 10, /* Teletex ASCII string */
62 SILC_STRING_NUMERICAL = 11, /* Numerical ASCII string (digits) */
63 SILC_STRING_LDAP_DN = 12, /* Strings for LDAP DNs, RFC 2253 */
64 SILC_STRING_UTF8_ESCAPE = 12, /* Escaped UTF-8 as defined in RFC 2253 */
66 SILC_STRING_LANGUAGE = 6, /* _Deprecated_, use SILC_STRING_LOCALE. */
70 /****f* silcutil/SilcStrUtilAPI/silc_pem_encode
74 * char *silc_pem_encode(unsigned char *data, SilcUInt32 len);
78 * Encodes data into PEM encoding. Returns NULL terminated PEM encoded
79 * data string. Note: This is originally public domain code and is
83 char *silc_pem_encode(unsigned char *data, SilcUInt32 len);
85 /****f* silcutil/SilcStrUtilAPI/silc_pem_encode_file
89 * char *silc_pem_encode_file(unsigned char *data, SilcUInt32 data_len);
93 * Same as silc_pem_encode() but puts newline ('\n') every 72 characters.
96 char *silc_pem_encode_file(unsigned char *data, SilcUInt32 data_len);
98 /****f* silcutil/SilcStrUtilAPI/silc_pem_decode
102 * unsigned char *silc_pem_decode(unsigned char *pem, SilcUInt32 pem_len,
103 * SilcUInt32 *ret_len);
107 * Decodes PEM into data. Returns the decoded data. Note: This is
108 * originally public domain code and is still PD.
111 unsigned char *silc_pem_decode(unsigned char *pem, SilcUInt32 pem_len,
112 SilcUInt32 *ret_len);
114 /****f* silcutil/SilcStrUtilAPI/silc_strncat
118 * char *silc_strncat(char *dest, SilcUInt32 dest_size,
119 * const char *src, SilcUInt32 src_len);
123 * Concatenates the `src' into `dest'. If `src_len' is more than the
124 * size of the `dest' (minus NULL at the end) the `src' will be
128 char *silc_strncat(char *dest, SilcUInt32 dest_size,
129 const char *src, SilcUInt32 src_len);
131 /****f* silcutil/SilcStrUtilAPI/silc_identifier_check
136 * silc_identifier_check(const unsigned char *identifier,
137 * SilcUInt32 identifier_len,
138 * SilcStringEncoding identifier_encoding,
139 * SilcUInt32 max_allowed_length,
140 * SilcUInt32 *out_len);
144 * Checks that the 'identifier' string is valid identifier string
145 * and does not contain any unassigned or prohibited character. This
146 * function is used to check for valid nicknames, server names,
147 * usernames, hostnames, service names, algorithm names, other security
148 * property names, and SILC Public Key name.
150 * If the 'max_allowed_length' is non-zero the identifier cannot be
151 * longer than that, and NULL is returned if it is. If zero (0), no
152 * length limit exist. For nicknames the max length must be 128 bytes.
153 * Other identifiers has no default limit, but application may choose
156 * Returns the validated string, that the caller must free. Returns
157 * NULL if the identifier string is not valid or contain unassigned or
158 * prohibited characters. Such identifier strings must not be used
159 * SILC protocol. The returned string is always in UTF-8 encoding.
160 * The length of the returned string is in 'out_len'.
164 * In addition of validating the identifier string, this function
165 * may map characters to other characters or remove characters from the
166 * original string. This is done as defined in the SILC protocol. Error
167 * is returned only if the string contains unassigned or prohibited
168 * characters. The original 'identifier' is not modified at any point.
171 unsigned char *silc_identifier_check(const unsigned char *identifier,
172 SilcUInt32 identifier_len,
173 SilcStringEncoding identifier_encoding,
174 SilcUInt32 max_allowed_length,
175 SilcUInt32 *out_len);
177 /****f* silcutil/SilcStrUtilAPI/silc_identifier_verify
182 * silc_identifier_check(const unsigned char *identifier,
183 * SilcUInt32 identifier_len,
184 * SilcStringEncoding identifier_encoding,
185 * SilcUInt32 max_allowed_length);
189 * Checks that the 'identifier' string is valid identifier string
190 * and does not contain any unassigned or prohibited character. This
191 * function is used to check for valid nicknames, server names,
192 * usernames, hostnames, service names, algorithm names, other security
193 * property names, and SILC Public Key name.
195 * If the 'max_allowed_length' is non-zero the identifier cannot be
196 * longer than that, and NULL is returned if it is. If zero (0), no
197 * length limit exist. For nicknames the max length must be 128 bytes.
198 * Other identifiers has no default limit, but application may choose
201 * Returns TRUE if the string is valid and FALSE if it is prohibited.
204 SilcBool silc_identifier_verify(const unsigned char *identifier,
205 SilcUInt32 identifier_len,
206 SilcStringEncoding identifier_encoding,
207 SilcUInt32 max_allowed_length);
209 /****f* silcutil/SilcStrUtilAPI/silc_channel_name_check
214 * silc_channel_name_check(const unsigned char *identifier,
215 * SilcUInt32 identifier_len,
216 * SilcStringEncoding identifier_encoding,
217 * SilcUInt32 max_allowed_length,
218 * SilcUInt32 *out_len);
222 * Checks that the 'identifier' string is valid channel name string
223 * and does not contain any unassigned or prohibited character.
225 * If the 'max_allowed_length' is non-zero the identifier cannot be
226 * longer than that, and NULL is returned if it is. If zero (0), no
227 * length limit exist. For channel names the max length must be 256
230 * Returns the validated string, that the caller must free. Returns
231 * NULL if the identifier string is not valid or contain unassigned or
232 * prohibited characters. Such identifier strings must not be used
233 * SILC protocol. The returned string is always in UTF-8 encoding.
234 * The length of the returned string is in 'out_len'.
238 * In addition of validating the channel name string, this function
239 * may map characters to other characters or remove characters from the
240 * original string. This is done as defined in the SILC protocol. Error
241 * is returned only if the string contains unassigned or prohibited
242 * characters. The original 'identifier' is not modified at any point.
245 unsigned char *silc_channel_name_check(const unsigned char *identifier,
246 SilcUInt32 identifier_len,
247 SilcStringEncoding identifier_encoding,
248 SilcUInt32 max_allowed_length,
249 SilcUInt32 *out_len);
251 /****f* silcutil/SilcStrUtilAPI/silc_channel_name_verify
256 * silc_channel_name_check(const unsigned char *identifier,
257 * SilcUInt32 identifier_len,
258 * SilcStringEncoding identifier_encoding,
259 * SilcUInt32 max_allowed_length);
263 * Checks that the 'identifier' string is valid channel name string
264 * and does not contain any unassigned or prohibited character.
266 * If the 'max_allowed_length' is non-zero the identifier cannot be
267 * longer than that, and NULL is returned if it is. If zero (0), no
268 * length limit exist. For channel names the max length must be 256
271 * Returns TRUE if the string is valid and FALSE if it is prohibited.
274 SilcBool silc_channel_name_verify(const unsigned char *identifier,
275 SilcUInt32 identifier_len,
276 SilcStringEncoding identifier_encoding,
277 SilcUInt32 max_allowed_length);
279 #endif /* SILCSTRUTIL_H */