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1 | /********************************************************************* | |
2 | * | |
3 | * Filename: parameters.c | |
4 | * Version: 1.0 | |
5 | * Description: A more general way to handle (pi,pl,pv) parameters | |
6 | * Status: Experimental. | |
7 | * Author: Dag Brattli <dagb@cs.uit.no> | |
8 | * Created at: Mon Jun 7 10:25:11 1999 | |
9 | * Modified at: Sun Jan 30 14:08:39 2000 | |
10 | * Modified by: Dag Brattli <dagb@cs.uit.no> | |
11 | * | |
12 | * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of | |
17 | * the License, or (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software | |
26 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
27 | * MA 02111-1307 USA | |
28 | * | |
29 | ********************************************************************/ | |
30 | ||
31 | #include <linux/types.h> | |
32 | #include <linux/module.h> | |
33 | ||
34 | #include <asm/unaligned.h> | |
35 | #include <asm/byteorder.h> | |
36 | ||
37 | #include <net/irda/irda.h> | |
38 | #include <net/irda/parameters.h> | |
39 | ||
40 | static int irda_extract_integer(void *self, __u8 *buf, int len, __u8 pi, | |
41 | PV_TYPE type, PI_HANDLER func); | |
42 | static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi, | |
43 | PV_TYPE type, PI_HANDLER func); | |
44 | static int irda_extract_octseq(void *self, __u8 *buf, int len, __u8 pi, | |
45 | PV_TYPE type, PI_HANDLER func); | |
46 | static int irda_extract_no_value(void *self, __u8 *buf, int len, __u8 pi, | |
47 | PV_TYPE type, PI_HANDLER func); | |
48 | ||
49 | static int irda_insert_integer(void *self, __u8 *buf, int len, __u8 pi, | |
50 | PV_TYPE type, PI_HANDLER func); | |
51 | static int irda_insert_no_value(void *self, __u8 *buf, int len, __u8 pi, | |
52 | PV_TYPE type, PI_HANDLER func); | |
53 | ||
54 | static int irda_param_unpack(__u8 *buf, char *fmt, ...); | |
55 | ||
56 | /* Parameter value call table. Must match PV_TYPE */ | |
57 | static PV_HANDLER pv_extract_table[] = { | |
58 | irda_extract_integer, /* Handler for any length integers */ | |
59 | irda_extract_integer, /* Handler for 8 bits integers */ | |
60 | irda_extract_integer, /* Handler for 16 bits integers */ | |
61 | irda_extract_string, /* Handler for strings */ | |
62 | irda_extract_integer, /* Handler for 32 bits integers */ | |
63 | irda_extract_octseq, /* Handler for octet sequences */ | |
64 | irda_extract_no_value /* Handler for no value parameters */ | |
65 | }; | |
66 | ||
67 | static PV_HANDLER pv_insert_table[] = { | |
68 | irda_insert_integer, /* Handler for any length integers */ | |
69 | irda_insert_integer, /* Handler for 8 bits integers */ | |
70 | irda_insert_integer, /* Handler for 16 bits integers */ | |
71 | NULL, /* Handler for strings */ | |
72 | irda_insert_integer, /* Handler for 32 bits integers */ | |
73 | NULL, /* Handler for octet sequences */ | |
74 | irda_insert_no_value /* Handler for no value parameters */ | |
75 | }; | |
76 | ||
77 | /* | |
78 | * Function irda_insert_no_value (self, buf, len, pi, type, func) | |
79 | */ | |
80 | static int irda_insert_no_value(void *self, __u8 *buf, int len, __u8 pi, | |
81 | PV_TYPE type, PI_HANDLER func) | |
82 | { | |
83 | irda_param_t p; | |
84 | int ret; | |
85 | ||
86 | p.pi = pi; | |
87 | p.pl = 0; | |
88 | ||
89 | /* Call handler for this parameter */ | |
90 | ret = (*func)(self, &p, PV_GET); | |
91 | ||
92 | /* Extract values anyway, since handler may need them */ | |
93 | irda_param_pack(buf, "bb", p.pi, p.pl); | |
94 | ||
95 | if (ret < 0) | |
96 | return ret; | |
97 | ||
98 | return 2; /* Inserted pl+2 bytes */ | |
99 | } | |
100 | ||
101 | /* | |
102 | * Function irda_extract_no_value (self, buf, len, type, func) | |
103 | * | |
104 | * Extracts a parameter without a pv field (pl=0) | |
105 | * | |
106 | */ | |
107 | static int irda_extract_no_value(void *self, __u8 *buf, int len, __u8 pi, | |
108 | PV_TYPE type, PI_HANDLER func) | |
109 | { | |
110 | irda_param_t p; | |
111 | int ret; | |
112 | ||
113 | /* Extract values anyway, since handler may need them */ | |
114 | irda_param_unpack(buf, "bb", &p.pi, &p.pl); | |
115 | ||
116 | /* Call handler for this parameter */ | |
117 | ret = (*func)(self, &p, PV_PUT); | |
118 | ||
119 | if (ret < 0) | |
120 | return ret; | |
121 | ||
122 | return 2; /* Extracted pl+2 bytes */ | |
123 | } | |
124 | ||
125 | /* | |
126 | * Function irda_insert_integer (self, buf, len, pi, type, func) | |
127 | */ | |
128 | static int irda_insert_integer(void *self, __u8 *buf, int len, __u8 pi, | |
129 | PV_TYPE type, PI_HANDLER func) | |
130 | { | |
131 | irda_param_t p; | |
132 | int n = 0; | |
133 | int err; | |
134 | ||
135 | p.pi = pi; /* In case handler needs to know */ | |
136 | p.pl = type & PV_MASK; /* The integer type codes the length as well */ | |
137 | p.pv.i = 0; /* Clear value */ | |
138 | ||
139 | /* Call handler for this parameter */ | |
140 | err = (*func)(self, &p, PV_GET); | |
141 | if (err < 0) | |
142 | return err; | |
143 | ||
144 | /* | |
145 | * If parameter length is still 0, then (1) this is an any length | |
146 | * integer, and (2) the handler function does not care which length | |
147 | * we choose to use, so we pick the one the gives the fewest bytes. | |
148 | */ | |
149 | if (p.pl == 0) { | |
150 | if (p.pv.i < 0xff) { | |
151 | IRDA_DEBUG(2, "%s(), using 1 byte\n", __func__); | |
152 | p.pl = 1; | |
153 | } else if (p.pv.i < 0xffff) { | |
154 | IRDA_DEBUG(2, "%s(), using 2 bytes\n", __func__); | |
155 | p.pl = 2; | |
156 | } else { | |
157 | IRDA_DEBUG(2, "%s(), using 4 bytes\n", __func__); | |
158 | p.pl = 4; /* Default length */ | |
159 | } | |
160 | } | |
161 | /* Check if buffer is long enough for insertion */ | |
162 | if (len < (2+p.pl)) { | |
163 | IRDA_WARNING("%s: buffer too short for insertion!\n", | |
164 | __func__); | |
165 | return -1; | |
166 | } | |
167 | IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d, pi=%d\n", __func__, | |
168 | p.pi, p.pl, p.pv.i); | |
169 | switch (p.pl) { | |
170 | case 1: | |
171 | n += irda_param_pack(buf, "bbb", p.pi, p.pl, (__u8) p.pv.i); | |
172 | break; | |
173 | case 2: | |
174 | if (type & PV_BIG_ENDIAN) | |
175 | p.pv.i = cpu_to_be16((__u16) p.pv.i); | |
176 | else | |
177 | p.pv.i = cpu_to_le16((__u16) p.pv.i); | |
178 | n += irda_param_pack(buf, "bbs", p.pi, p.pl, (__u16) p.pv.i); | |
179 | break; | |
180 | case 4: | |
181 | if (type & PV_BIG_ENDIAN) | |
182 | cpu_to_be32s(&p.pv.i); | |
183 | else | |
184 | cpu_to_le32s(&p.pv.i); | |
185 | n += irda_param_pack(buf, "bbi", p.pi, p.pl, p.pv.i); | |
186 | ||
187 | break; | |
188 | default: | |
189 | IRDA_WARNING("%s: length %d not supported\n", | |
190 | __func__, p.pl); | |
191 | /* Skip parameter */ | |
192 | return -1; | |
193 | } | |
194 | ||
195 | return p.pl+2; /* Inserted pl+2 bytes */ | |
196 | } | |
197 | ||
198 | /* | |
199 | * Function irda_extract integer (self, buf, len, pi, type, func) | |
200 | * | |
201 | * Extract a possibly variable length integer from buffer, and call | |
202 | * handler for processing of the parameter | |
203 | */ | |
204 | static int irda_extract_integer(void *self, __u8 *buf, int len, __u8 pi, | |
205 | PV_TYPE type, PI_HANDLER func) | |
206 | { | |
207 | irda_param_t p; | |
208 | int n = 0; | |
209 | int extract_len; /* Real length we extract */ | |
210 | int err; | |
211 | ||
212 | p.pi = pi; /* In case handler needs to know */ | |
213 | p.pl = buf[1]; /* Extract length of value */ | |
214 | p.pv.i = 0; /* Clear value */ | |
215 | extract_len = p.pl; /* Default : extract all */ | |
216 | ||
217 | /* Check if buffer is long enough for parsing */ | |
218 | if (len < (2+p.pl)) { | |
219 | IRDA_WARNING("%s: buffer too short for parsing! " | |
220 | "Need %d bytes, but len is only %d\n", | |
221 | __func__, p.pl, len); | |
222 | return -1; | |
223 | } | |
224 | ||
225 | /* | |
226 | * Check that the integer length is what we expect it to be. If the | |
227 | * handler want a 16 bits integer then a 32 bits is not good enough | |
228 | * PV_INTEGER means that the handler is flexible. | |
229 | */ | |
230 | if (((type & PV_MASK) != PV_INTEGER) && ((type & PV_MASK) != p.pl)) { | |
231 | IRDA_ERROR("%s: invalid parameter length! " | |
232 | "Expected %d bytes, but value had %d bytes!\n", | |
233 | __func__, type & PV_MASK, p.pl); | |
234 | ||
235 | /* Most parameters are bit/byte fields or little endian, | |
236 | * so it's ok to only extract a subset of it (the subset | |
237 | * that the handler expect). This is necessary, as some | |
238 | * broken implementations seems to add extra undefined bits. | |
239 | * If the parameter is shorter than we expect or is big | |
240 | * endian, we can't play those tricks. Jean II */ | |
241 | if((p.pl < (type & PV_MASK)) || (type & PV_BIG_ENDIAN)) { | |
242 | /* Skip parameter */ | |
243 | return p.pl+2; | |
244 | } else { | |
245 | /* Extract subset of it, fallthrough */ | |
246 | extract_len = type & PV_MASK; | |
247 | } | |
248 | } | |
249 | ||
250 | ||
251 | switch (extract_len) { | |
252 | case 1: | |
253 | n += irda_param_unpack(buf+2, "b", &p.pv.i); | |
254 | break; | |
255 | case 2: | |
256 | n += irda_param_unpack(buf+2, "s", &p.pv.i); | |
257 | if (type & PV_BIG_ENDIAN) | |
258 | p.pv.i = be16_to_cpu((__u16) p.pv.i); | |
259 | else | |
260 | p.pv.i = le16_to_cpu((__u16) p.pv.i); | |
261 | break; | |
262 | case 4: | |
263 | n += irda_param_unpack(buf+2, "i", &p.pv.i); | |
264 | if (type & PV_BIG_ENDIAN) | |
265 | be32_to_cpus(&p.pv.i); | |
266 | else | |
267 | le32_to_cpus(&p.pv.i); | |
268 | break; | |
269 | default: | |
270 | IRDA_WARNING("%s: length %d not supported\n", | |
271 | __func__, p.pl); | |
272 | ||
273 | /* Skip parameter */ | |
274 | return p.pl+2; | |
275 | } | |
276 | ||
277 | IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d, pi=%d\n", __func__, | |
278 | p.pi, p.pl, p.pv.i); | |
279 | /* Call handler for this parameter */ | |
280 | err = (*func)(self, &p, PV_PUT); | |
281 | if (err < 0) | |
282 | return err; | |
283 | ||
284 | return p.pl+2; /* Extracted pl+2 bytes */ | |
285 | } | |
286 | ||
287 | /* | |
288 | * Function irda_extract_string (self, buf, len, type, func) | |
289 | */ | |
290 | static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi, | |
291 | PV_TYPE type, PI_HANDLER func) | |
292 | { | |
293 | char str[33]; | |
294 | irda_param_t p; | |
295 | int err; | |
296 | ||
297 | IRDA_DEBUG(2, "%s()\n", __func__); | |
298 | ||
299 | p.pi = pi; /* In case handler needs to know */ | |
300 | p.pl = buf[1]; /* Extract length of value */ | |
301 | if (p.pl > 32) | |
302 | p.pl = 32; | |
303 | ||
304 | IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d\n", __func__, | |
305 | p.pi, p.pl); | |
306 | ||
307 | /* Check if buffer is long enough for parsing */ | |
308 | if (len < (2+p.pl)) { | |
309 | IRDA_WARNING("%s: buffer too short for parsing! " | |
310 | "Need %d bytes, but len is only %d\n", | |
311 | __func__, p.pl, len); | |
312 | return -1; | |
313 | } | |
314 | ||
315 | /* Should be safe to copy string like this since we have already | |
316 | * checked that the buffer is long enough */ | |
317 | strncpy(str, buf+2, p.pl); | |
318 | ||
319 | IRDA_DEBUG(2, "%s(), str=0x%02x 0x%02x\n", __func__, | |
320 | (__u8) str[0], (__u8) str[1]); | |
321 | ||
322 | /* Null terminate string */ | |
323 | str[p.pl] = '\0'; | |
324 | ||
325 | p.pv.c = str; /* Handler will need to take a copy */ | |
326 | ||
327 | /* Call handler for this parameter */ | |
328 | err = (*func)(self, &p, PV_PUT); | |
329 | if (err < 0) | |
330 | return err; | |
331 | ||
332 | return p.pl+2; /* Extracted pl+2 bytes */ | |
333 | } | |
334 | ||
335 | /* | |
336 | * Function irda_extract_octseq (self, buf, len, type, func) | |
337 | */ | |
338 | static int irda_extract_octseq(void *self, __u8 *buf, int len, __u8 pi, | |
339 | PV_TYPE type, PI_HANDLER func) | |
340 | { | |
341 | irda_param_t p; | |
342 | ||
343 | p.pi = pi; /* In case handler needs to know */ | |
344 | p.pl = buf[1]; /* Extract length of value */ | |
345 | ||
346 | /* Check if buffer is long enough for parsing */ | |
347 | if (len < (2+p.pl)) { | |
348 | IRDA_WARNING("%s: buffer too short for parsing! " | |
349 | "Need %d bytes, but len is only %d\n", | |
350 | __func__, p.pl, len); | |
351 | return -1; | |
352 | } | |
353 | ||
354 | IRDA_DEBUG(0, "%s(), not impl\n", __func__); | |
355 | ||
356 | return p.pl+2; /* Extracted pl+2 bytes */ | |
357 | } | |
358 | ||
359 | /* | |
360 | * Function irda_param_pack (skb, fmt, ...) | |
361 | * | |
362 | * Format: | |
363 | * 'i' = 32 bits integer | |
364 | * 's' = string | |
365 | * | |
366 | */ | |
367 | int irda_param_pack(__u8 *buf, char *fmt, ...) | |
368 | { | |
369 | irda_pv_t arg; | |
370 | va_list args; | |
371 | char *p; | |
372 | int n = 0; | |
373 | ||
374 | va_start(args, fmt); | |
375 | ||
376 | for (p = fmt; *p != '\0'; p++) { | |
377 | switch (*p) { | |
378 | case 'b': /* 8 bits unsigned byte */ | |
379 | buf[n++] = (__u8)va_arg(args, int); | |
380 | break; | |
381 | case 's': /* 16 bits unsigned short */ | |
382 | arg.i = (__u16)va_arg(args, int); | |
383 | put_unaligned((__u16)arg.i, (__u16 *)(buf+n)); n+=2; | |
384 | break; | |
385 | case 'i': /* 32 bits unsigned integer */ | |
386 | arg.i = va_arg(args, __u32); | |
387 | put_unaligned(arg.i, (__u32 *)(buf+n)); n+=4; | |
388 | break; | |
389 | #if 0 | |
390 | case 'c': /* \0 terminated string */ | |
391 | arg.c = va_arg(args, char *); | |
392 | strcpy(buf+n, arg.c); | |
393 | n += strlen(arg.c) + 1; | |
394 | break; | |
395 | #endif | |
396 | default: | |
397 | va_end(args); | |
398 | return -1; | |
399 | } | |
400 | } | |
401 | va_end(args); | |
402 | ||
403 | return 0; | |
404 | } | |
405 | EXPORT_SYMBOL(irda_param_pack); | |
406 | ||
407 | /* | |
408 | * Function irda_param_unpack (skb, fmt, ...) | |
409 | */ | |
410 | static int irda_param_unpack(__u8 *buf, char *fmt, ...) | |
411 | { | |
412 | irda_pv_t arg; | |
413 | va_list args; | |
414 | char *p; | |
415 | int n = 0; | |
416 | ||
417 | va_start(args, fmt); | |
418 | ||
419 | for (p = fmt; *p != '\0'; p++) { | |
420 | switch (*p) { | |
421 | case 'b': /* 8 bits byte */ | |
422 | arg.ip = va_arg(args, __u32 *); | |
423 | *arg.ip = buf[n++]; | |
424 | break; | |
425 | case 's': /* 16 bits short */ | |
426 | arg.ip = va_arg(args, __u32 *); | |
427 | *arg.ip = get_unaligned((__u16 *)(buf+n)); n+=2; | |
428 | break; | |
429 | case 'i': /* 32 bits unsigned integer */ | |
430 | arg.ip = va_arg(args, __u32 *); | |
431 | *arg.ip = get_unaligned((__u32 *)(buf+n)); n+=4; | |
432 | break; | |
433 | #if 0 | |
434 | case 'c': /* \0 terminated string */ | |
435 | arg.c = va_arg(args, char *); | |
436 | strcpy(arg.c, buf+n); | |
437 | n += strlen(arg.c) + 1; | |
438 | break; | |
439 | #endif | |
440 | default: | |
441 | va_end(args); | |
442 | return -1; | |
443 | } | |
444 | ||
445 | } | |
446 | va_end(args); | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | /* | |
452 | * Function irda_param_insert (self, pi, buf, len, info) | |
453 | * | |
454 | * Insert the specified parameter (pi) into buffer. Returns number of | |
455 | * bytes inserted | |
456 | */ | |
457 | int irda_param_insert(void *self, __u8 pi, __u8 *buf, int len, | |
458 | pi_param_info_t *info) | |
459 | { | |
460 | pi_minor_info_t *pi_minor_info; | |
461 | __u8 pi_minor; | |
462 | __u8 pi_major; | |
463 | int type; | |
464 | int ret = -1; | |
465 | int n = 0; | |
466 | ||
467 | IRDA_ASSERT(buf != NULL, return ret;); | |
468 | IRDA_ASSERT(info != NULL, return ret;); | |
469 | ||
470 | pi_minor = pi & info->pi_mask; | |
471 | pi_major = pi >> info->pi_major_offset; | |
472 | ||
473 | /* Check if the identifier value (pi) is valid */ | |
474 | if ((pi_major > info->len-1) || | |
475 | (pi_minor > info->tables[pi_major].len-1)) | |
476 | { | |
477 | IRDA_DEBUG(0, "%s(), no handler for parameter=0x%02x\n", | |
478 | __func__, pi); | |
479 | ||
480 | /* Skip this parameter */ | |
481 | return -1; | |
482 | } | |
483 | ||
484 | /* Lookup the info on how to parse this parameter */ | |
485 | pi_minor_info = &info->tables[pi_major].pi_minor_call_table[pi_minor]; | |
486 | ||
487 | /* Find expected data type for this parameter identifier (pi)*/ | |
488 | type = pi_minor_info->type; | |
489 | ||
490 | /* Check if handler has been implemented */ | |
491 | if (!pi_minor_info->func) { | |
492 | IRDA_MESSAGE("%s: no handler for pi=%#x\n", __func__, pi); | |
493 | /* Skip this parameter */ | |
494 | return -1; | |
495 | } | |
496 | ||
497 | /* Insert parameter value */ | |
498 | ret = (*pv_insert_table[type & PV_MASK])(self, buf+n, len, pi, type, | |
499 | pi_minor_info->func); | |
500 | return ret; | |
501 | } | |
502 | EXPORT_SYMBOL(irda_param_insert); | |
503 | ||
504 | /* | |
505 | * Function irda_param_extract (self, buf, len, info) | |
506 | * | |
507 | * Parse all parameters. If len is correct, then everything should be | |
508 | * safe. Returns the number of bytes that was parsed | |
509 | * | |
510 | */ | |
511 | static int irda_param_extract(void *self, __u8 *buf, int len, | |
512 | pi_param_info_t *info) | |
513 | { | |
514 | pi_minor_info_t *pi_minor_info; | |
515 | __u8 pi_minor; | |
516 | __u8 pi_major; | |
517 | int type; | |
518 | int ret = -1; | |
519 | int n = 0; | |
520 | ||
521 | IRDA_ASSERT(buf != NULL, return ret;); | |
522 | IRDA_ASSERT(info != NULL, return ret;); | |
523 | ||
524 | pi_minor = buf[n] & info->pi_mask; | |
525 | pi_major = buf[n] >> info->pi_major_offset; | |
526 | ||
527 | /* Check if the identifier value (pi) is valid */ | |
528 | if ((pi_major > info->len-1) || | |
529 | (pi_minor > info->tables[pi_major].len-1)) | |
530 | { | |
531 | IRDA_DEBUG(0, "%s(), no handler for parameter=0x%02x\n", | |
532 | __func__, buf[0]); | |
533 | ||
534 | /* Skip this parameter */ | |
535 | return 2 + buf[n + 1]; /* Continue */ | |
536 | } | |
537 | ||
538 | /* Lookup the info on how to parse this parameter */ | |
539 | pi_minor_info = &info->tables[pi_major].pi_minor_call_table[pi_minor]; | |
540 | ||
541 | /* Find expected data type for this parameter identifier (pi)*/ | |
542 | type = pi_minor_info->type; | |
543 | ||
544 | IRDA_DEBUG(3, "%s(), pi=[%d,%d], type=%d\n", __func__, | |
545 | pi_major, pi_minor, type); | |
546 | ||
547 | /* Check if handler has been implemented */ | |
548 | if (!pi_minor_info->func) { | |
549 | IRDA_MESSAGE("%s: no handler for pi=%#x\n", | |
550 | __func__, buf[n]); | |
551 | /* Skip this parameter */ | |
552 | return 2 + buf[n + 1]; /* Continue */ | |
553 | } | |
554 | ||
555 | /* Parse parameter value */ | |
556 | ret = (*pv_extract_table[type & PV_MASK])(self, buf+n, len, buf[n], | |
557 | type, pi_minor_info->func); | |
558 | return ret; | |
559 | } | |
560 | ||
561 | /* | |
562 | * Function irda_param_extract_all (self, buf, len, info) | |
563 | * | |
564 | * Parse all parameters. If len is correct, then everything should be | |
565 | * safe. Returns the number of bytes that was parsed | |
566 | * | |
567 | */ | |
568 | int irda_param_extract_all(void *self, __u8 *buf, int len, | |
569 | pi_param_info_t *info) | |
570 | { | |
571 | int ret = -1; | |
572 | int n = 0; | |
573 | ||
574 | IRDA_ASSERT(buf != NULL, return ret;); | |
575 | IRDA_ASSERT(info != NULL, return ret;); | |
576 | ||
577 | /* | |
578 | * Parse all parameters. Each parameter must be at least two bytes | |
579 | * long or else there is no point in trying to parse it | |
580 | */ | |
581 | while (len > 2) { | |
582 | ret = irda_param_extract(self, buf+n, len, info); | |
583 | if (ret < 0) | |
584 | return ret; | |
585 | ||
586 | n += ret; | |
587 | len -= ret; | |
588 | } | |
589 | return n; | |
590 | } | |
591 | EXPORT_SYMBOL(irda_param_extract_all); |