100 #define INC_BIT(bs) if((++(bs)->bit)>7){(bs)->cur++;(bs)->bit=0;}  argument
101 #define INC_BITS(bs,b) if(((bs)->bit+=(b))>7){(bs)->cur+=(bs)->bit>>3;(bs)->bit&=7;}  argument
102 #define BYTE_ALIGN(bs) if((bs)->bit){(bs)->cur++;(bs)->bit=0;}  argument
103 static unsigned int get_len(struct bitstr *bs);
104 static unsigned int get_bit(struct bitstr *bs);
105 static unsigned int get_bits(struct bitstr *bs, unsigned int b);
106 static unsigned int get_bitmap(struct bitstr *bs, unsigned int b);
107 static unsigned int get_uint(struct bitstr *bs, int b);
110 static int decode_nul(struct bitstr *bs, const struct field_t *f, char *base, int level);
111 static int decode_bool(struct bitstr *bs, const struct field_t *f, char *base, int level);
112 static int decode_oid(struct bitstr *bs, const struct field_t *f, char *base, int level);
113 static int decode_int(struct bitstr *bs, const struct field_t *f, char *base, int level);
114 static int decode_enum(struct bitstr *bs, const struct field_t *f, char *base, int level);
115 static int decode_bitstr(struct bitstr *bs, const struct field_t *f, char *base, int level);
116 static int decode_numstr(struct bitstr *bs, const struct field_t *f, char *base, int level);
117 static int decode_octstr(struct bitstr *bs, const struct field_t *f, char *base, int level);
118 static int decode_bmpstr(struct bitstr *bs, const struct field_t *f, char *base, int level);
119 static int decode_seq(struct bitstr *bs, const struct field_t *f, char *base, int level);
120 static int decode_seqof(struct bitstr *bs, const struct field_t *f, char *base, int level);
121 static int decode_choice(struct bitstr *bs, const struct field_t *f, char *base, int level);
150 static unsigned int get_len(struct bitstr *bs)  in get_len()  argument
154 	v = *bs->cur++;  in get_len()
159 		v += *bs->cur++;  in get_len()
165 static int nf_h323_error_boundary(struct bitstr *bs, size_t bytes, size_t bits)  in nf_h323_error_boundary()  argument
167 	bits += bs->bit;  in nf_h323_error_boundary()
172 	if (bs->cur + bytes > bs->end)  in nf_h323_error_boundary()
178 static unsigned int get_bit(struct bitstr *bs)  in get_bit()  argument
180 	unsigned int b = (*bs->cur) & (0x80 >> bs->bit);  in get_bit()
182 	INC_BIT(bs);  in get_bit()
188 static unsigned int get_bits(struct bitstr *bs, unsigned int b)  in get_bits()  argument
192 	v = (*bs->cur) & (0xffU >> bs->bit);  in get_bits()
193 	l = b + bs->bit;  in get_bits()
197 		bs->bit = l;  in get_bits()
199 		bs->cur++;  in get_bits()
200 		bs->bit = 0;  in get_bits()
204 		v += *(++bs->cur);  in get_bits()
206 		bs->bit = l - 8;  in get_bits()
213 static unsigned int get_bitmap(struct bitstr *bs, unsigned int b)  in get_bitmap()  argument
220 	l = bs->bit + b;  in get_bitmap()
223 		v = (unsigned int)(*bs->cur) << (bs->bit + 24);  in get_bitmap()
224 		bs->bit = l;  in get_bitmap()
226 		v = (unsigned int)(*bs->cur++) << (bs->bit + 24);  in get_bitmap()
227 		bs->bit = 0;  in get_bitmap()
231 			v |= (unsigned int)(*bs->cur++) << shift;  in get_bitmap()
234 			v |= (unsigned int)(*bs->cur) << shift;  in get_bitmap()
235 			v <<= bs->bit;  in get_bitmap()
237 			v <<= bs->bit;  in get_bitmap()
238 			v |= (*bs->cur) >> (8 - bs->bit);  in get_bitmap()
241 		bs->bit = l & 0x7;  in get_bitmap()
252 static unsigned int get_uint(struct bitstr *bs, int b)  in get_uint()  argument
258 		v |= *bs->cur++;  in get_uint()
262 		v |= *bs->cur++;  in get_uint()
266 		v |= *bs->cur++;  in get_uint()
270 		v |= *bs->cur++;  in get_uint()
276 static int decode_nul(struct bitstr *bs, const struct field_t *f,  in decode_nul()  argument
284 static int decode_bool(struct bitstr *bs, const struct field_t *f,  in decode_bool()  argument
289 	INC_BIT(bs);  in decode_bool()
290 	if (nf_h323_error_boundary(bs, 0, 0))  in decode_bool()
295 static int decode_oid(struct bitstr *bs, const struct field_t *f,  in decode_oid()  argument
302 	BYTE_ALIGN(bs);  in decode_oid()
303 	if (nf_h323_error_boundary(bs, 1, 0))  in decode_oid()
306 	len = *bs->cur++;  in decode_oid()
307 	bs->cur += len;  in decode_oid()
308 	if (nf_h323_error_boundary(bs, 0, 0))  in decode_oid()
314 static int decode_int(struct bitstr *bs, const struct field_t *f,  in decode_int()  argument
323 		BYTE_ALIGN(bs);  in decode_int()
324 		bs->cur++;  in decode_int()
327 		BYTE_ALIGN(bs);  in decode_int()
328 		bs->cur += 2;  in decode_int()
331 		if (nf_h323_error_boundary(bs, 0, 2))  in decode_int()
333 		len = get_bits(bs, 2) + 1;  in decode_int()
334 		BYTE_ALIGN(bs);  in decode_int()
336 			unsigned int v = get_uint(bs, len) + f->lb;  in decode_int()
340 		bs->cur += len;  in decode_int()
343 		BYTE_ALIGN(bs);  in decode_int()
344 		if (nf_h323_error_boundary(bs, 2, 0))  in decode_int()
346 		len = get_len(bs);  in decode_int()
347 		bs->cur += len;  in decode_int()
350 		INC_BITS(bs, f->sz);  in decode_int()
356 	if (nf_h323_error_boundary(bs, 0, 0))  in decode_int()
361 static int decode_enum(struct bitstr *bs, const struct field_t *f,  in decode_enum()  argument
366 	if ((f->attr & EXT) && get_bit(bs)) {  in decode_enum()
367 		INC_BITS(bs, 7);  in decode_enum()
369 		INC_BITS(bs, f->sz);  in decode_enum()
372 	if (nf_h323_error_boundary(bs, 0, 0))  in decode_enum()
377 static int decode_bitstr(struct bitstr *bs, const struct field_t *f,  in decode_bitstr()  argument
384 	BYTE_ALIGN(bs);  in decode_bitstr()
390 		if (nf_h323_error_boundary(bs, 2, 0))  in decode_bitstr()
392 		len = (*bs->cur++) << 8;  in decode_bitstr()
393 		len += (*bs->cur++) + f->lb;  in decode_bitstr()
396 		if (nf_h323_error_boundary(bs, 2, 0))  in decode_bitstr()
398 		len = get_len(bs);  in decode_bitstr()
405 	bs->cur += len >> 3;  in decode_bitstr()
406 	bs->bit = len & 7;  in decode_bitstr()
408 	if (nf_h323_error_boundary(bs, 0, 0))  in decode_bitstr()
413 static int decode_numstr(struct bitstr *bs, const struct field_t *f,  in decode_numstr()  argument
421 	if (nf_h323_error_boundary(bs, 0, f->sz))  in decode_numstr()
423 	len = get_bits(bs, f->sz) + f->lb;  in decode_numstr()
425 	BYTE_ALIGN(bs);  in decode_numstr()
426 	INC_BITS(bs, (len << 2));  in decode_numstr()
428 	if (nf_h323_error_boundary(bs, 0, 0))  in decode_numstr()
433 static int decode_octstr(struct bitstr *bs, const struct field_t *f,  in decode_octstr()  argument
443 			BYTE_ALIGN(bs);  in decode_octstr()
448 					     bs->cur[0], bs->cur[1],  in decode_octstr()
449 					     bs->cur[2], bs->cur[3],  in decode_octstr()
450 					     bs->cur[4] * 256 + bs->cur[5]));  in decode_octstr()
452 				    bs->cur - bs->buf;  in decode_octstr()
458 		BYTE_ALIGN(bs);  in decode_octstr()
459 		if (nf_h323_error_boundary(bs, 1, 0))  in decode_octstr()
461 		len = (*bs->cur++) + f->lb;  in decode_octstr()
464 		BYTE_ALIGN(bs);  in decode_octstr()
465 		if (nf_h323_error_boundary(bs, 2, 0))  in decode_octstr()
467 		len = get_len(bs) + f->lb;  in decode_octstr()
470 		if (nf_h323_error_boundary(bs, 0, f->sz))  in decode_octstr()
472 		len = get_bits(bs, f->sz) + f->lb;  in decode_octstr()
473 		BYTE_ALIGN(bs);  in decode_octstr()
477 	bs->cur += len;  in decode_octstr()
481 	if (nf_h323_error_boundary(bs, 0, 0))  in decode_octstr()
486 static int decode_bmpstr(struct bitstr *bs, const struct field_t *f,  in decode_bmpstr()  argument
495 		BYTE_ALIGN(bs);  in decode_bmpstr()
496 		if (nf_h323_error_boundary(bs, 1, 0))  in decode_bmpstr()
498 		len = (*bs->cur++) + f->lb;  in decode_bmpstr()
501 		if (nf_h323_error_boundary(bs, 0, f->sz))  in decode_bmpstr()
503 		len = get_bits(bs, f->sz) + f->lb;  in decode_bmpstr()
504 		BYTE_ALIGN(bs);  in decode_bmpstr()
508 	bs->cur += len << 1;  in decode_bmpstr()
510 	if (nf_h323_error_boundary(bs, 0, 0))  in decode_bmpstr()
515 static int decode_seq(struct bitstr *bs, const struct field_t *f,  in decode_seq()  argument
529 	if (nf_h323_error_boundary(bs, 0, 1))  in decode_seq()
531 	ext = (f->attr & EXT) ? get_bit(bs) : 0;  in decode_seq()
534 	if (nf_h323_error_boundary(bs, 0, f->sz))  in decode_seq()
538 	bmp = get_bitmap(bs, f->sz);  in decode_seq()
557 			if (nf_h323_error_boundary(bs, 2, 0))  in decode_seq()
559 			len = get_len(bs);  in decode_seq()
560 			if (nf_h323_error_boundary(bs, len, 0))  in decode_seq()
565 				bs->cur += len;  in decode_seq()
568 			beg = bs->cur;  in decode_seq()
571 			if ((err = (Decoders[son->type]) (bs, son, base,  in decode_seq()
576 			bs->cur = beg + len;  in decode_seq()
577 			bs->bit = 0;  in decode_seq()
578 		} else if ((err = (Decoders[son->type]) (bs, son, base,  in decode_seq()
589 	if (nf_h323_error_boundary(bs, 0, 7))  in decode_seq()
591 	bmp2_len = get_bits(bs, 7) + 1;  in decode_seq()
592 	if (nf_h323_error_boundary(bs, 0, bmp2_len))  in decode_seq()
596 	bmp2 = get_bitmap(bs, bmp2_len);  in decode_seq()
600 	BYTE_ALIGN(bs);  in decode_seq()
606 			if (nf_h323_error_boundary(bs, 2, 0))  in decode_seq()
608 			len = get_len(bs);  in decode_seq()
609 			if (nf_h323_error_boundary(bs, len, 0))  in decode_seq()
611 			bs->cur += len;  in decode_seq()
624 		if (nf_h323_error_boundary(bs, 2, 0))  in decode_seq()
626 		len = get_len(bs);  in decode_seq()
627 		if (nf_h323_error_boundary(bs, len, 0))  in decode_seq()
632 			bs->cur += len;  in decode_seq()
635 		beg = bs->cur;  in decode_seq()
637 		if ((err = (Decoders[son->type]) (bs, son, base,  in decode_seq()
642 		bs->cur = beg + len;  in decode_seq()
643 		bs->bit = 0;  in decode_seq()
648 static int decode_seqof(struct bitstr *bs, const struct field_t *f,  in decode_seqof()  argument
664 		BYTE_ALIGN(bs);  in decode_seqof()
665 		if (nf_h323_error_boundary(bs, 1, 0))  in decode_seqof()
667 		count = *bs->cur++;  in decode_seqof()
670 		BYTE_ALIGN(bs);  in decode_seqof()
671 		if (nf_h323_error_boundary(bs, 2, 0))  in decode_seqof()
673 		count = *bs->cur++;  in decode_seqof()
675 		count += *bs->cur++;  in decode_seqof()
678 		BYTE_ALIGN(bs);  in decode_seqof()
679 		if (nf_h323_error_boundary(bs, 2, 0))  in decode_seqof()
681 		count = get_len(bs);  in decode_seqof()
684 		if (nf_h323_error_boundary(bs, 0, f->sz))  in decode_seqof()
686 		count = get_bits(bs, f->sz);  in decode_seqof()
704 			BYTE_ALIGN(bs);  in decode_seqof()
705 			if (nf_h323_error_boundary(bs, 2, 0))  in decode_seqof()
707 			len = get_len(bs);  in decode_seqof()
708 			if (nf_h323_error_boundary(bs, len, 0))  in decode_seqof()
713 				bs->cur += len;  in decode_seqof()
716 			beg = bs->cur;  in decode_seqof()
718 			if ((err = (Decoders[son->type]) (bs, son,  in decode_seqof()
726 			bs->cur = beg + len;  in decode_seqof()
727 			bs->bit = 0;  in decode_seqof()
729 			if ((err = (Decoders[son->type]) (bs, son,  in decode_seqof()
744 static int decode_choice(struct bitstr *bs, const struct field_t *f,  in decode_choice()  argument
758 	if (nf_h323_error_boundary(bs, 0, 1))  in decode_choice()
760 	if ((f->attr & EXT) && get_bit(bs)) {  in decode_choice()
762 		if (nf_h323_error_boundary(bs, 0, 7))  in decode_choice()
764 		type = get_bits(bs, 7) + f->lb;  in decode_choice()
767 		if (nf_h323_error_boundary(bs, 0, f->sz))  in decode_choice()
769 		type = get_bits(bs, f->sz);  in decode_choice()
780 		BYTE_ALIGN(bs);  in decode_choice()
781 		if (nf_h323_error_boundary(bs, 2, 0))  in decode_choice()
783 		len = get_len(bs);  in decode_choice()
784 		if (nf_h323_error_boundary(bs, len, 0))  in decode_choice()
786 		bs->cur += len;  in decode_choice()
798 		BYTE_ALIGN(bs);  in decode_choice()
799 		if (nf_h323_error_boundary(bs, len, 0))  in decode_choice()
801 		len = get_len(bs);  in decode_choice()
802 		if (nf_h323_error_boundary(bs, len, 0))  in decode_choice()
807 			bs->cur += len;  in decode_choice()
810 		beg = bs->cur;  in decode_choice()
812 		if ((err = (Decoders[son->type]) (bs, son, base, level + 1)) <  in decode_choice()
816 		bs->cur = beg + len;  in decode_choice()
817 		bs->bit = 0;  in decode_choice()
818 	} else if ((err = (Decoders[son->type]) (bs, son, base, level + 1)) <  in decode_choice()
831 	struct bitstr bs;  in DecodeRasMessage()  local
833 	bs.buf = bs.beg = bs.cur = buf;  in DecodeRasMessage()
834 	bs.end = buf + sz;  in DecodeRasMessage()
835 	bs.bit = 0;  in DecodeRasMessage()
837 	return decode_choice(&bs, &ras_message, (char *) ras, 0);  in DecodeRasMessage()
847 	struct bitstr bs;  in DecodeH323_UserInformation()  local
849 	bs.buf = buf;  in DecodeH323_UserInformation()
850 	bs.beg = bs.cur = beg;  in DecodeH323_UserInformation()
851 	bs.end = beg + sz;  in DecodeH323_UserInformation()
852 	bs.bit = 0;  in DecodeH323_UserInformation()
854 	return decode_seq(&bs, &h323_userinformation, (char *) uuie, 0);  in DecodeH323_UserInformation()
865 	struct bitstr bs;  in DecodeMultimediaSystemControlMessage()  local
867 	bs.buf = bs.beg = bs.cur = buf;  in DecodeMultimediaSystemControlMessage()
868 	bs.end = buf + sz;  in DecodeMultimediaSystemControlMessage()
869 	bs.bit = 0;  in DecodeMultimediaSystemControlMessage()
871 	return decode_choice(&bs, &multimediasystemcontrolmessage,  in DecodeMultimediaSystemControlMessage()