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1da177e4 LT |
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 */ | |
cc53ded2 | 136 | p.pl = type & PV_MASK; /* The integer type codes the length as well */ |
1da177e4 LT |
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 | /* | |
cc53ded2 | 145 | * If parameter length is still 0, then (1) this is an any length |
1da177e4 LT |
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) { | |
0dc47877 | 151 | IRDA_DEBUG(2, "%s(), using 1 byte\n", __func__); |
1da177e4 LT |
152 | p.pl = 1; |
153 | } else if (p.pv.i < 0xffff) { | |
0dc47877 | 154 | IRDA_DEBUG(2, "%s(), using 2 bytes\n", __func__); |
1da177e4 LT |
155 | p.pl = 2; |
156 | } else { | |
0dc47877 | 157 | IRDA_DEBUG(2, "%s(), using 4 bytes\n", __func__); |
1da177e4 LT |
158 | p.pl = 4; /* Default length */ |
159 | } | |
160 | } | |
161 | /* Check if buffer is long enough for insertion */ | |
162 | if (len < (2+p.pl)) { | |
b450777a | 163 | IRDA_WARNING("%s: buffer too short for insertion!\n", |
0dc47877 | 164 | __func__); |
1da177e4 LT |
165 | return -1; |
166 | } | |
0dc47877 | 167 | IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d, pi=%d\n", __func__, |
1da177e4 LT |
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", | |
0dc47877 | 190 | __func__, p.pl); |
1da177e4 LT |
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; | |
cc53ded2 | 209 | int extract_len; /* Real length we extract */ |
1da177e4 LT |
210 | int err; |
211 | ||
212 | p.pi = pi; /* In case handler needs to know */ | |
cc53ded2 | 213 | p.pl = buf[1]; /* Extract length of value */ |
1da177e4 LT |
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)) { | |
b450777a | 219 | IRDA_WARNING("%s: buffer too short for parsing! " |
1da177e4 | 220 | "Need %d bytes, but len is only %d\n", |
0dc47877 | 221 | __func__, p.pl, len); |
1da177e4 LT |
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", | |
0dc47877 | 233 | __func__, type & PV_MASK, p.pl); |
1da177e4 LT |
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", | |
0dc47877 | 271 | __func__, p.pl); |
1da177e4 LT |
272 | |
273 | /* Skip parameter */ | |
274 | return p.pl+2; | |
275 | } | |
276 | ||
0dc47877 | 277 | IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d, pi=%d\n", __func__, |
1da177e4 LT |
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 | ||
0dc47877 | 297 | IRDA_DEBUG(2, "%s()\n", __func__); |
1da177e4 LT |
298 | |
299 | p.pi = pi; /* In case handler needs to know */ | |
cc53ded2 | 300 | p.pl = buf[1]; /* Extract length of value */ |
1da177e4 | 301 | |
0dc47877 | 302 | IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d\n", __func__, |
1da177e4 LT |
303 | p.pi, p.pl); |
304 | ||
305 | /* Check if buffer is long enough for parsing */ | |
306 | if (len < (2+p.pl)) { | |
b450777a | 307 | IRDA_WARNING("%s: buffer too short for parsing! " |
1da177e4 | 308 | "Need %d bytes, but len is only %d\n", |
0dc47877 | 309 | __func__, p.pl, len); |
1da177e4 LT |
310 | return -1; |
311 | } | |
312 | ||
313 | /* Should be safe to copy string like this since we have already | |
314 | * checked that the buffer is long enough */ | |
315 | strncpy(str, buf+2, p.pl); | |
316 | ||
0dc47877 | 317 | IRDA_DEBUG(2, "%s(), str=0x%02x 0x%02x\n", __func__, |
1da177e4 LT |
318 | (__u8) str[0], (__u8) str[1]); |
319 | ||
320 | /* Null terminate string */ | |
321 | str[p.pl+1] = '\0'; | |
322 | ||
323 | p.pv.c = str; /* Handler will need to take a copy */ | |
324 | ||
325 | /* Call handler for this parameter */ | |
326 | err = (*func)(self, &p, PV_PUT); | |
327 | if (err < 0) | |
328 | return err; | |
329 | ||
330 | return p.pl+2; /* Extracted pl+2 bytes */ | |
331 | } | |
332 | ||
333 | /* | |
334 | * Function irda_extract_octseq (self, buf, len, type, func) | |
335 | */ | |
336 | static int irda_extract_octseq(void *self, __u8 *buf, int len, __u8 pi, | |
337 | PV_TYPE type, PI_HANDLER func) | |
338 | { | |
339 | irda_param_t p; | |
340 | ||
341 | p.pi = pi; /* In case handler needs to know */ | |
cc53ded2 | 342 | p.pl = buf[1]; /* Extract length of value */ |
1da177e4 LT |
343 | |
344 | /* Check if buffer is long enough for parsing */ | |
345 | if (len < (2+p.pl)) { | |
b450777a | 346 | IRDA_WARNING("%s: buffer too short for parsing! " |
1da177e4 | 347 | "Need %d bytes, but len is only %d\n", |
0dc47877 | 348 | __func__, p.pl, len); |
1da177e4 LT |
349 | return -1; |
350 | } | |
351 | ||
0dc47877 | 352 | IRDA_DEBUG(0, "%s(), not impl\n", __func__); |
1da177e4 LT |
353 | |
354 | return p.pl+2; /* Extracted pl+2 bytes */ | |
355 | } | |
356 | ||
357 | /* | |
358 | * Function irda_param_pack (skb, fmt, ...) | |
359 | * | |
360 | * Format: | |
361 | * 'i' = 32 bits integer | |
362 | * 's' = string | |
363 | * | |
364 | */ | |
365 | int irda_param_pack(__u8 *buf, char *fmt, ...) | |
366 | { | |
367 | irda_pv_t arg; | |
368 | va_list args; | |
369 | char *p; | |
370 | int n = 0; | |
371 | ||
372 | va_start(args, fmt); | |
373 | ||
374 | for (p = fmt; *p != '\0'; p++) { | |
375 | switch (*p) { | |
376 | case 'b': /* 8 bits unsigned byte */ | |
377 | buf[n++] = (__u8)va_arg(args, int); | |
378 | break; | |
379 | case 's': /* 16 bits unsigned short */ | |
380 | arg.i = (__u16)va_arg(args, int); | |
381 | put_unaligned((__u16)arg.i, (__u16 *)(buf+n)); n+=2; | |
382 | break; | |
383 | case 'i': /* 32 bits unsigned integer */ | |
384 | arg.i = va_arg(args, __u32); | |
385 | put_unaligned(arg.i, (__u32 *)(buf+n)); n+=4; | |
386 | break; | |
387 | #if 0 | |
388 | case 'c': /* \0 terminated string */ | |
389 | arg.c = va_arg(args, char *); | |
390 | strcpy(buf+n, arg.c); | |
391 | n += strlen(arg.c) + 1; | |
392 | break; | |
393 | #endif | |
394 | default: | |
395 | va_end(args); | |
396 | return -1; | |
397 | } | |
398 | } | |
399 | va_end(args); | |
400 | ||
401 | return 0; | |
402 | } | |
403 | EXPORT_SYMBOL(irda_param_pack); | |
404 | ||
405 | /* | |
406 | * Function irda_param_unpack (skb, fmt, ...) | |
407 | */ | |
408 | static int irda_param_unpack(__u8 *buf, char *fmt, ...) | |
409 | { | |
410 | irda_pv_t arg; | |
411 | va_list args; | |
412 | char *p; | |
413 | int n = 0; | |
414 | ||
415 | va_start(args, fmt); | |
416 | ||
417 | for (p = fmt; *p != '\0'; p++) { | |
418 | switch (*p) { | |
419 | case 'b': /* 8 bits byte */ | |
420 | arg.ip = va_arg(args, __u32 *); | |
421 | *arg.ip = buf[n++]; | |
422 | break; | |
423 | case 's': /* 16 bits short */ | |
424 | arg.ip = va_arg(args, __u32 *); | |
425 | *arg.ip = get_unaligned((__u16 *)(buf+n)); n+=2; | |
426 | break; | |
427 | case 'i': /* 32 bits unsigned integer */ | |
428 | arg.ip = va_arg(args, __u32 *); | |
429 | *arg.ip = get_unaligned((__u32 *)(buf+n)); n+=4; | |
430 | break; | |
431 | #if 0 | |
432 | case 'c': /* \0 terminated string */ | |
433 | arg.c = va_arg(args, char *); | |
434 | strcpy(arg.c, buf+n); | |
435 | n += strlen(arg.c) + 1; | |
436 | break; | |
437 | #endif | |
438 | default: | |
439 | va_end(args); | |
440 | return -1; | |
441 | } | |
442 | ||
443 | } | |
444 | va_end(args); | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | /* | |
450 | * Function irda_param_insert (self, pi, buf, len, info) | |
451 | * | |
452 | * Insert the specified parameter (pi) into buffer. Returns number of | |
453 | * bytes inserted | |
454 | */ | |
455 | int irda_param_insert(void *self, __u8 pi, __u8 *buf, int len, | |
456 | pi_param_info_t *info) | |
457 | { | |
458 | pi_minor_info_t *pi_minor_info; | |
459 | __u8 pi_minor; | |
460 | __u8 pi_major; | |
461 | int type; | |
462 | int ret = -1; | |
463 | int n = 0; | |
464 | ||
465 | IRDA_ASSERT(buf != NULL, return ret;); | |
a26e01d7 | 466 | IRDA_ASSERT(info != NULL, return ret;); |
1da177e4 LT |
467 | |
468 | pi_minor = pi & info->pi_mask; | |
469 | pi_major = pi >> info->pi_major_offset; | |
470 | ||
471 | /* Check if the identifier value (pi) is valid */ | |
472 | if ((pi_major > info->len-1) || | |
473 | (pi_minor > info->tables[pi_major].len-1)) | |
474 | { | |
475 | IRDA_DEBUG(0, "%s(), no handler for parameter=0x%02x\n", | |
0dc47877 | 476 | __func__, pi); |
1da177e4 LT |
477 | |
478 | /* Skip this parameter */ | |
479 | return -1; | |
480 | } | |
481 | ||
482 | /* Lookup the info on how to parse this parameter */ | |
483 | pi_minor_info = &info->tables[pi_major].pi_minor_call_table[pi_minor]; | |
484 | ||
485 | /* Find expected data type for this parameter identifier (pi)*/ | |
486 | type = pi_minor_info->type; | |
487 | ||
488 | /* Check if handler has been implemented */ | |
489 | if (!pi_minor_info->func) { | |
0dc47877 | 490 | IRDA_MESSAGE("%s: no handler for pi=%#x\n", __func__, pi); |
1da177e4 LT |
491 | /* Skip this parameter */ |
492 | return -1; | |
493 | } | |
494 | ||
495 | /* Insert parameter value */ | |
496 | ret = (*pv_insert_table[type & PV_MASK])(self, buf+n, len, pi, type, | |
497 | pi_minor_info->func); | |
498 | return ret; | |
499 | } | |
500 | EXPORT_SYMBOL(irda_param_insert); | |
501 | ||
502 | /* | |
503 | * Function irda_param_extract (self, buf, len, info) | |
504 | * | |
505 | * Parse all parameters. If len is correct, then everything should be | |
506 | * safe. Returns the number of bytes that was parsed | |
507 | * | |
508 | */ | |
509 | static int irda_param_extract(void *self, __u8 *buf, int len, | |
510 | pi_param_info_t *info) | |
511 | { | |
512 | pi_minor_info_t *pi_minor_info; | |
513 | __u8 pi_minor; | |
514 | __u8 pi_major; | |
515 | int type; | |
516 | int ret = -1; | |
517 | int n = 0; | |
518 | ||
519 | IRDA_ASSERT(buf != NULL, return ret;); | |
a26e01d7 | 520 | IRDA_ASSERT(info != NULL, return ret;); |
1da177e4 LT |
521 | |
522 | pi_minor = buf[n] & info->pi_mask; | |
523 | pi_major = buf[n] >> info->pi_major_offset; | |
524 | ||
525 | /* Check if the identifier value (pi) is valid */ | |
526 | if ((pi_major > info->len-1) || | |
527 | (pi_minor > info->tables[pi_major].len-1)) | |
528 | { | |
529 | IRDA_DEBUG(0, "%s(), no handler for parameter=0x%02x\n", | |
0dc47877 | 530 | __func__, buf[0]); |
1da177e4 LT |
531 | |
532 | /* Skip this parameter */ | |
533 | return 2 + buf[n + 1]; /* Continue */ | |
534 | } | |
535 | ||
536 | /* Lookup the info on how to parse this parameter */ | |
537 | pi_minor_info = &info->tables[pi_major].pi_minor_call_table[pi_minor]; | |
538 | ||
539 | /* Find expected data type for this parameter identifier (pi)*/ | |
540 | type = pi_minor_info->type; | |
541 | ||
0dc47877 | 542 | IRDA_DEBUG(3, "%s(), pi=[%d,%d], type=%d\n", __func__, |
1da177e4 LT |
543 | pi_major, pi_minor, type); |
544 | ||
545 | /* Check if handler has been implemented */ | |
546 | if (!pi_minor_info->func) { | |
547 | IRDA_MESSAGE("%s: no handler for pi=%#x\n", | |
0dc47877 | 548 | __func__, buf[n]); |
1da177e4 LT |
549 | /* Skip this parameter */ |
550 | return 2 + buf[n + 1]; /* Continue */ | |
551 | } | |
552 | ||
553 | /* Parse parameter value */ | |
554 | ret = (*pv_extract_table[type & PV_MASK])(self, buf+n, len, buf[n], | |
555 | type, pi_minor_info->func); | |
556 | return ret; | |
557 | } | |
558 | ||
559 | /* | |
560 | * Function irda_param_extract_all (self, buf, len, info) | |
561 | * | |
562 | * Parse all parameters. If len is correct, then everything should be | |
563 | * safe. Returns the number of bytes that was parsed | |
564 | * | |
565 | */ | |
6819bc2e | 566 | int irda_param_extract_all(void *self, __u8 *buf, int len, |
1da177e4 LT |
567 | pi_param_info_t *info) |
568 | { | |
569 | int ret = -1; | |
570 | int n = 0; | |
571 | ||
572 | IRDA_ASSERT(buf != NULL, return ret;); | |
a26e01d7 | 573 | IRDA_ASSERT(info != NULL, return ret;); |
1da177e4 LT |
574 | |
575 | /* | |
576 | * Parse all parameters. Each parameter must be at least two bytes | |
577 | * long or else there is no point in trying to parse it | |
578 | */ | |
579 | while (len > 2) { | |
580 | ret = irda_param_extract(self, buf+n, len, info); | |
581 | if (ret < 0) | |
582 | return ret; | |
583 | ||
584 | n += ret; | |
585 | len -= ret; | |
586 | } | |
587 | return n; | |
588 | } | |
589 | EXPORT_SYMBOL(irda_param_extract_all); |