5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2003 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 Buffer Format Interface
24 * SILC Buffer Format API provides a few functions for formatting
25 * various different data types into a buffer, and retrieving
26 * various data from buffer into specific data types. It is usefull
27 * to format for example packets and later unformat them.
36 /****f* silcutil/SilcBufferFormatAPI/silc_buffer_format
40 * int silc_buffer_format(SilcBuffer dst, ...);
44 * Formats a buffer from a variable argument list. Returns -1 on error
45 * and the length of the formatted buffer otherwise.
49 * ret = silc_buffer_format(buffer,
50 * SILC_STR_INT(intval),
51 * SILC_STR_CHAR(charval),
52 * SILC_STR_INT(intval),
53 * SILC_STR_SHORT(str_len),
54 * SILC_STR_UI_XNSTRING(str, str_len),
60 int silc_buffer_format(SilcBuffer dst, ...);
62 /****f* silcutil/SilcBufferFormatAPI/silc_buffer_unformat
66 * int silc_buffer_unformat(SilcBuffer src, ...);
70 * Unformats a buffer from a variable argument list. Returns -1 on error
71 * and the length of the unformatted buffer otherwise.
75 * ret = silc_buffer_unformat(buffer,
76 * SILC_STR_INT(&intval),
77 * SILC_STR_CHAR(&charval),
78 * SILC_STR_INT(&intval2),
79 * SILC_STR_SHORT(&str_len),
80 * SILC_STR_UI16_NSTRING_ALLOC(&str, &str_len),
86 int silc_buffer_unformat(SilcBuffer src, ...);
88 /****f* silcutil/SilcBufferFormatAPI/silc_buffer_format_vp
92 * int silc_buffer_format_vp(SilcBuffer dst, va_list vp);
96 * Formats a buffer from a variable argument list indicated by the `ap'.
97 * Returns -1 on error and the length of the formatted buffer otherwise.
100 int silc_buffer_format_vp(SilcBuffer dst, va_list ap);
102 /****f* silcutil/SilcBufferFormatAPI/silc_buffer_unformat_vp
106 * int silc_buffer_unformat_vp(SilcBuffer src, va_list vp);
110 * Unformats a buffer from a variable argument list indicated by the `ap'.
111 * Returns -1 on error and the length of the unformatted buffer otherwise.
114 int silc_buffer_unformat_vp(SilcBuffer src, va_list ap);
116 /****f* silcutil/SilcBufferFormatAPI/silc_buffer_strformat
120 * int silc_buffer_strformat(SilcBuffer dst, ...);
124 * Formats a buffer from variable argument list of strings. Each
125 * string must be NULL-terminated and the variable argument list must
126 * be end with SILC_STR_END argument. This allows that a string in
127 * the list can be NULL, in which case it is skipped. This automatically
128 * allocates the space for the buffer data but `dst' must be already
129 * allocated by the caller.
133 * ret = silc_buffer_strformat(buffer, "foo", "bar", SILC_STR_END);
138 int silc_buffer_strformat(SilcBuffer dst, ...);
140 /* Macros for expanding parameters into variable function argument list.
141 These are passed to silc_buffer_format and silc_buffer_unformat
144 /* Buffer parameter types.
149 Any XXX_STRING_ALLOC types will allocate space for the data and
150 memcpy the data to the pointer sent as argument (in unformatting).
152 Any XXX_STRING will not allocate or copy any data. Instead it
153 will set the pointer to the data. Note that the data pointer
154 returned (in unformatting) must not be freed.
158 SILC_BUFFER_PARAM_SI8_CHAR,
159 SILC_BUFFER_PARAM_UI8_CHAR,
161 SILC_BUFFER_PARAM_SI16_SHORT,
162 SILC_BUFFER_PARAM_UI16_SHORT,
164 SILC_BUFFER_PARAM_SI32_INT,
165 SILC_BUFFER_PARAM_UI32_INT,
167 SILC_BUFFER_PARAM_SI64_INT,
168 SILC_BUFFER_PARAM_UI64_INT,
170 SILC_BUFFER_PARAM_UI8_STRING, /* No copy */
171 SILC_BUFFER_PARAM_UI8_STRING_ALLOC, /* Alloc + memcpy */
172 SILC_BUFFER_PARAM_UI16_STRING, /* No copy */
173 SILC_BUFFER_PARAM_UI16_STRING_ALLOC, /* Alloc + memcpy */
174 SILC_BUFFER_PARAM_UI32_STRING, /* No copy */
175 SILC_BUFFER_PARAM_UI32_STRING_ALLOC, /* Alloc + memcpy */
176 SILC_BUFFER_PARAM_UI8_NSTRING, /* No copy */
177 SILC_BUFFER_PARAM_UI8_NSTRING_ALLOC, /* Alloc + memcpy */
178 SILC_BUFFER_PARAM_UI16_NSTRING, /* No copy */
179 SILC_BUFFER_PARAM_UI16_NSTRING_ALLOC, /* Alloc + memcpy */
180 SILC_BUFFER_PARAM_UI32_NSTRING, /* No copy */
181 SILC_BUFFER_PARAM_UI32_NSTRING_ALLOC, /* Alloc + memcpy */
182 SILC_BUFFER_PARAM_UI_XNSTRING, /* No copy */
183 SILC_BUFFER_PARAM_UI_XNSTRING_ALLOC, /* Alloc + memcpy */
185 SILC_BUFFER_PARAM_END
186 } SilcBufferParamType;
188 /****d* silcutil/SilcBufferFormatAPI/SILC_STR_*_CHAR
192 * #define SILC_STR_UI_CHAR() ...
193 * #define SILC_STR_SI_CHAR() ...
197 * One signed/unsigned character.
199 * Formatting: SILC_STR_SI_CHAR(char)
200 * SILC_STR_UI_CHAR(unsigned char)
201 * Unformatting: SILC_STR_SI_CHAR(char *)
202 * SILC_STR_UI_CHAR(unsigned char *)
205 #define SILC_STR_SI_CHAR(x) SILC_BUFFER_PARAM_SI8_CHAR, (x)
206 #define SILC_STR_UI_CHAR(x) SILC_BUFFER_PARAM_UI8_CHAR, (x)
208 /****d* silcutil/SilcBufferFormatAPI/SILC_STR_*_SHORT
212 * #define SILC_STR_UI_SHORT() ...
213 * #define SILC_STR_SI_SHORT() ...
219 * Formatting: SILC_STR_SI_SHORT(short)
220 * SILC_STR_UI_SHORT(SilcUInt16)
221 * Unformatting: SILC_STR_SI_SHORT(short *)
222 * SILC_STR_UI_SHORT(SilcUInt16 *)
225 #define SILC_STR_SI_SHORT(x) SILC_BUFFER_PARAM_SI16_SHORT, (x)
226 #define SILC_STR_UI_SHORT(x) SILC_BUFFER_PARAM_UI16_SHORT, (x)
228 /****d* silcutil/SilcBufferFormatAPI/SILC_STR_*_INT
232 * #define SILC_STR_UI_INT() ...
233 * #define SILC_STR_SI_INT() ...
239 * Formatting: SILC_STR_SI_INT(int)
240 * SILC_STR_UI_INT(SilcUInt32)
241 * Unformatting: SILC_STR_SI_INT(int *)
242 * SILC_STR_UI_INT(SilcUInt32 *)
245 #define SILC_STR_SI_INT(x) SILC_BUFFER_PARAM_SI32_INT, (x)
246 #define SILC_STR_UI_INT(x) SILC_BUFFER_PARAM_UI32_INT, (x)
248 /****d* silcutil/SilcBufferFormatAPI/SILC_STR_*_INT64
252 * #define SILC_STR_UI_INT64() ...
253 * #define SILC_STR_SI_INT64() ...
259 * Formatting: SILC_STR_SI_INT64(int)
260 * SILC_STR_UI_INT64(SilcUInt32)
261 * Unformatting: SILC_STR_SI_INT64(int *)
262 * SILC_STR_UI_INT64(SilcUInt32 *)
265 #define SILC_STR_SI_INT64(x) SILC_BUFFER_PARAM_SI64_INT, (x)
266 #define SILC_STR_UI_INT64(x) SILC_BUFFER_PARAM_UI64_INT, (x)
268 /****d* silcutil/SilcBufferFormatAPI/SILC_STR_*_STRING
272 * #define SILC_STR_UI8_STRING() ...
273 * #define SILC_STR_UI8_STRING_ALLOC() ...
274 * #define SILC_STR_UI16_STRING() ...
275 * #define SILC_STR_UI16_STRING_ALLOC() ...
276 * #define SILC_STR_UI32_STRING() ...
277 * #define SILC_STR_UI32_STRING_ALLOC() ...
281 * Unsigned NULL terminated string. Note that the string must be
282 * NULL terminated because strlen() will be used to get the length of
285 * Formatting: SILC_STR_UI32_STRING(unsigned char *)
286 * Unformatting: SILC_STR_UI32_STRING(unsigned char **)
288 * Unformatting procedure will check for length of the string from the
289 * buffer before trying to get the string out. Thus, one *must* format the
290 * length as UI_INT or UI_SHORT into the buffer *before* formatting the
291 * actual string to the buffer, and, in unformatting one must ignore the
292 * length of the string because unformatting procedure will take it
297 * Formatting: ..., SILC_STR_UI_INT(strlen(string)),
298 * SILC_STR_UI32_STRING(string), ...
299 * Unformatting: ..., SILC_STR_UI32_STRING(&string), ...
301 * I.e., you can ignore the formatted length field in unformatting.
303 * UI8, UI16 and UI32 means that the length is considered to be
304 * either char (8 bits), short (16 bits) or int (32 bits) in
307 * _ALLOC routines automatically allocates memory for the variable sent
308 * as argument in unformatting.
311 #define SILC_STR_UI8_STRING(x) SILC_BUFFER_PARAM_UI8_STRING, (x)
312 #define SILC_STR_UI8_STRING_ALLOC(x) SILC_BUFFER_PARAM_UI8_STRING_ALLOC, (x)
313 #define SILC_STR_UI16_STRING(x) SILC_BUFFER_PARAM_UI16_STRING, (x)
314 #define SILC_STR_UI16_STRING_ALLOC(x) SILC_BUFFER_PARAM_UI16_STRING_ALLOC, (x)
315 #define SILC_STR_UI32_STRING(x) SILC_BUFFER_PARAM_UI32_STRING, (x)
316 #define SILC_STR_UI32_STRING_ALLOC(x) SILC_BUFFER_PARAM_UI32_STRING_ALLOC, (x)
318 /****d* silcutil/SilcBufferFormatAPI/SILC_STR_*_NSTRING
322 * #define SILC_STR_UI8_NSTRING() ...
323 * #define SILC_STR_UI8_NSTRING_ALLOC() ...
324 * #define SILC_STR_UI16_NSTRING() ...
325 * #define SILC_STR_UI16_NSTRING_ALLOC() ...
326 * #define SILC_STR_UI32_NSTRING() ...
327 * #define SILC_STR_UI32_NSTRING_ALLOC() ...
331 * Unsigned string. Second argument is the length of the string.
333 * Formatting: SILC_STR_UI32_NSTRING(unsigned char *, SilcUInt32)
334 * Unformatting: SILC_STR_UI32_NSTRING(unsigned char **, SilcUInt32 *)
336 * Unformatting procedure will check for length of the string from the
337 * buffer before trying to get the string out. Thus, one *must* format the
338 * length as UI_INT or UI_SHORT into the buffer *before* formatting the
339 * actual string to the buffer, and, in unformatting one must ignore the
340 * length of the string because unformatting procedure will take it
345 * Formatting: ..., SILC_STR_UI_INT(strlen(string)),
346 * SILC_STR_UI32_NSTRING(string, strlen(string)), ...
347 * Unformatting: ..., SILC_STR_UI32_NSTRING(&string, &len), ...
349 * I.e., you can ignore the formatted length field in unformatting. The
350 * length taken from the buffer is returned to the pointer sent as
351 * argument (&len in above example).
353 * UI8, UI16 and UI32 means that the length is considered to be
354 * either char (8 bits), short (16 bits) or int (32 bits) in
357 * _ALLOC routines automatically allocates memory for the variable sent
358 * as argument in unformatting.
361 #define SILC_STR_UI8_NSTRING(x, l) SILC_BUFFER_PARAM_UI8_NSTRING, (x), (l)
362 #define SILC_STR_UI8_NSTRING_ALLOC(x, l) \
363 SILC_BUFFER_PARAM_UI8_NSTRING_ALLOC, (x), (l)
364 #define SILC_STR_UI16_NSTRING(x, l) SILC_BUFFER_PARAM_UI16_NSTRING, (x), (l)
365 #define SILC_STR_UI16_NSTRING_ALLOC(x, l) \
366 SILC_BUFFER_PARAM_UI16_NSTRING_ALLOC, (x), (l)
367 #define SILC_STR_UI32_NSTRING(x, l) SILC_BUFFER_PARAM_UI32_NSTRING, (x), (l)
368 #define SILC_STR_UI32_NSTRING_ALLOC(x, l) \
369 SILC_BUFFER_PARAM_UI32_NSTRING_ALLOC, (x), (l)
371 /****d* silcutil/SilcBufferFormatAPI/SILC_STR_UI_XNSTRING
375 * #define SILC_STR_UI_XNSTRING() ...
376 * #define SILC_STR_UI_XNSTRING_ALLOC() ...
380 * Extended Unsigned string formatting. Second argument is the length of
383 * Formatting: SILC_STR_UI_XNSTRING(unsigned char *, SilcUInt32)
384 * Unformatting: SILC_STR_UI_XNSTRING(unsigned char **, SilcUInt32)
386 * This type can be used to take arbitrary length string from the buffer
387 * by sending the requested amount of bytes as argument. This differs
388 * from *_STRING and *_NSTRING so that this doesn't try to find the
389 * length of the data from the buffer but the length of the data is
390 * sent as argument. This a handy way to unformat fixed length strings
391 * from the buffer without having the length of the string formatted
394 * _ALLOC routines automatically allocates memory for the variable sent
395 * as argument in unformatting.
398 #define SILC_STR_UI_XNSTRING(x, l) SILC_BUFFER_PARAM_UI_XNSTRING, (x), (l)
399 #define SILC_STR_UI_XNSTRING_ALLOC(x, l) \
400 SILC_BUFFER_PARAM_UI_XNSTRING_ALLOC, (x), (l)
402 /****d* silcutil/SilcBufferFormatAPI/SILC_STR_END
406 * #define SILC_STR_END ...
410 * Marks end of the argument list. This must be at the end of the
411 * argument list or error will occur.
414 #define SILC_STR_END SILC_BUFFER_PARAM_END
416 #endif /* !SILCBUFFMT_H */