3 * Copyright (c) 2007 Lev Walkin <vlm@lionet.info>. All rights reserved.
4 * Redistribution and modifications are permitted subject to BSD license.
6 #include <asn_internal.h>
7 #include <per_support.h>
8 #include <constr_TYPE.h>
9 #include <per_opentype.h>
11 typedef struct uper_ugot_key {
12 asn_per_data_t oldpd; /* Old per data source */
14 size_t ot_moved; /* Number of bits moved by OT processing */
18 static int uper_ugot_refill(asn_per_data_t *pd);
19 static int per_skip_bits(asn_per_data_t *pd, int skip_nbits);
20 static asn_dec_rval_t uper_sot_suck(const asn_codec_ctx_t *,
21 const asn_TYPE_descriptor_t *td,
22 const asn_per_constraints_t *constraints,
23 void **sptr, asn_per_data_t *pd);
26 * Encode an "open type field".
30 uper_open_type_put(const asn_TYPE_descriptor_t *td,
31 const asn_per_constraints_t *constraints, const void *sptr,
37 ASN_DEBUG("Open type put %s ...", td->name);
39 size = uper_encode_to_new_buffer(td, constraints, sptr, &buf);
40 if(size <= 0) return -1;
42 ASN_DEBUG("Open type put %s of length %" ASN_PRI_SSIZE " + overhead (1byte?)", td->name,
48 ssize_t may_save = uper_put_length(po, size, &need_eom);
49 ASN_DEBUG("Prepending length %" ASN_PRI_SSIZE
50 " to %s and allowing to save %" ASN_PRI_SSIZE,
51 size, td->name, may_save);
52 if(may_save < 0) break;
53 if(per_put_many_bits(po, bptr, may_save * 8)) break;
54 bptr = (char *)bptr + may_save;
56 if(need_eom && uper_put_length(po, 0, 0)) {
69 uper_open_type_get_simple(const asn_codec_ctx_t *ctx,
70 const asn_TYPE_descriptor_t *td,
71 const asn_per_constraints_t *constraints, void **sptr,
82 ASN__STACK_OVERFLOW_CHECK(ctx);
84 ASN_DEBUG("Getting open type %s...", td->name);
87 chunk_bytes = uper_get_length(pd, -1, 0, &repeat);
92 if(bufLen + chunk_bytes > bufSize) {
94 bufSize = chunk_bytes + (bufSize << 2);
95 ptr = REALLOC(buf, bufSize);
102 if(per_get_many_bits(pd, buf + bufLen, 0, chunk_bytes << 3)) {
106 bufLen += chunk_bytes;
109 ASN_DEBUG("Getting open type %s encoded in %ld bytes", td->name,
112 memset(&spd, 0, sizeof(spd));
114 spd.nbits = bufLen << 3;
116 ASN_DEBUG_INDENT_ADD(+4);
117 rv = td->op->uper_decoder(ctx, td, constraints, sptr, &spd);
118 ASN_DEBUG_INDENT_ADD(-4);
120 if(rv.code == RC_OK) {
121 /* Check padding validity */
122 padding = spd.nbits - spd.nboff;
123 if (((padding > 0 && padding < 8) ||
125 (spd.nboff == 0 && spd.nbits == 8 && spd.buffer == buf)) &&
126 per_get_few_bits(&spd, padding) == 0) {
127 /* Everything is cool */
133 ASN_DEBUG("Too large padding %d in open type", (int)padding);
136 ASN_DEBUG("No padding");
140 /* rv.code could be RC_WMORE, nonsense in this context */
141 rv.code = RC_FAIL; /* Noone would give us more */
147 static asn_dec_rval_t CC_NOTUSED
148 uper_open_type_get_complex(const asn_codec_ctx_t *ctx,
149 const asn_TYPE_descriptor_t *td,
150 asn_per_constraints_t *constraints, void **sptr,
151 asn_per_data_t *pd) {
156 ASN__STACK_OVERFLOW_CHECK(ctx);
158 ASN_DEBUG("Getting open type %s from %s", td->name,
159 asn_bit_data_string(pd));
164 pd->refill = uper_ugot_refill;
165 pd->refill_key = &arg;
166 pd->nbits = pd->nboff; /* 0 good bits at this point, will refill */
167 pd->moved = 0; /* This now counts the open type size in bits */
169 ASN_DEBUG_INDENT_ADD(+4);
170 rv = td->op->uper_decoder(ctx, td, constraints, sptr, pd);
171 ASN_DEBUG_INDENT_ADD(-4);
173 #define UPDRESTOREPD do { \
174 /* buffer and nboff are valid, preserve them. */ \
175 pd->nbits = arg.oldpd.nbits - (pd->moved - arg.ot_moved); \
176 pd->moved = arg.oldpd.moved + (pd->moved - arg.ot_moved); \
177 pd->refill = arg.oldpd.refill; \
178 pd->refill_key = arg.oldpd.refill_key; \
181 if(rv.code != RC_OK) {
186 ASN_DEBUG("OpenType %s pd%s old%s unclaimed=%d, repeat=%d", td->name,
187 asn_bit_data_string(pd),
188 asn_bit_data_string(&arg.oldpd),
189 (int)arg.unclaimed, (int)arg.repeat);
191 padding = pd->moved % 8;
195 ASN_DEBUG("Too large padding %d in open type",
201 padding = 8 - padding;
202 ASN_DEBUG("Getting padding of %d bits", (int)padding);
203 pvalue = per_get_few_bits(pd, padding);
206 ASN_DEBUG("Padding skip failed");
211 ASN_DEBUG("Non-blank padding (%d bits 0x%02x)",
212 (int)padding, (int)pvalue);
217 if(pd->nboff != pd->nbits) {
218 ASN_DEBUG("Open type %s overhead pd%s old%s", td->name,
219 asn_bit_data_string(pd), asn_bit_data_string(&arg.oldpd));
224 arg.unclaimed += pd->nbits - pd->nboff;
228 /* Adjust pd back so it points to original data */
231 /* Skip data not consumed by the decoder */
233 ASN_DEBUG("Getting unclaimed %d", (int)arg.unclaimed);
234 switch(per_skip_bits(pd, arg.unclaimed)) {
236 ASN_DEBUG("Claim of %d failed", (int)arg.unclaimed);
239 ASN_DEBUG("Got claim of %d", (int)arg.unclaimed);
242 /* Padding must be blank */
243 ASN_DEBUG("Non-blank unconsumed padding");
250 ASN_DEBUG("Not consumed the whole thing");
260 uper_open_type_get(const asn_codec_ctx_t *ctx, const asn_TYPE_descriptor_t *td,
261 const asn_per_constraints_t *constraints, void **sptr,
262 asn_per_data_t *pd) {
263 return uper_open_type_get_simple(ctx, td, constraints, sptr, pd);
267 uper_open_type_skip(const asn_codec_ctx_t *ctx, asn_per_data_t *pd) {
268 asn_TYPE_descriptor_t s_td;
269 asn_TYPE_operation_t s_op;
272 s_td.name = "<unknown extension>";
274 s_op.uper_decoder = uper_sot_suck;
276 rv = uper_open_type_get(ctx, &s_td, 0, 0, pd);
284 * Internal functions.
287 static asn_dec_rval_t
288 uper_sot_suck(const asn_codec_ctx_t *ctx, const asn_TYPE_descriptor_t *td,
289 const asn_per_constraints_t *constraints, void **sptr,
290 asn_per_data_t *pd) {
298 while(per_get_few_bits(pd, 1) >= 0);
301 rv.consumed = pd->moved;
307 uper_ugot_refill(asn_per_data_t *pd) {
308 uper_ugot_key *arg = pd->refill_key;
309 ssize_t next_chunk_bytes, next_chunk_bits;
312 asn_per_data_t *oldpd = &arg->oldpd;
314 ASN_DEBUG("REFILLING pd->moved=%ld, oldpd->moved=%ld",
315 (long)pd->moved, (long)oldpd->moved);
317 /* Advance our position to where pd is */
318 oldpd->buffer = pd->buffer;
319 oldpd->nboff = pd->nboff;
320 oldpd->nbits -= pd->moved - arg->ot_moved;
321 oldpd->moved += pd->moved - arg->ot_moved;
322 arg->ot_moved = pd->moved;
325 /* Refill the container */
326 if(per_get_few_bits(oldpd, 1))
328 if(oldpd->nboff == 0) {
332 pd->buffer = oldpd->buffer;
333 pd->nboff = oldpd->nboff - 1;
334 pd->nbits = oldpd->nbits;
335 ASN_DEBUG("UNCLAIMED <- return from (pd->moved=%ld)",
341 ASN_DEBUG("Want more but refill doesn't have it");
345 next_chunk_bytes = uper_get_length(oldpd, -1, 0, &arg->repeat);
346 ASN_DEBUG("Open type LENGTH %ld bytes at off %ld, repeat %ld",
347 (long)next_chunk_bytes, (long)oldpd->moved, (long)arg->repeat);
348 if(next_chunk_bytes < 0) return -1;
349 if(next_chunk_bytes == 0) {
350 pd->refill = 0; /* No more refills, naturally */
351 assert(!arg->repeat); /* Implementation guarantee */
353 next_chunk_bits = next_chunk_bytes << 3;
354 avail = oldpd->nbits - oldpd->nboff;
355 if(avail >= next_chunk_bits) {
356 pd->nbits = oldpd->nboff + next_chunk_bits;
358 ASN_DEBUG("!+Parent frame %ld bits, alloting %ld [%ld..%ld] (%ld)",
359 (long)next_chunk_bits, (long)oldpd->moved,
360 (long)oldpd->nboff, (long)oldpd->nbits,
361 (long)(oldpd->nbits - oldpd->nboff));
363 pd->nbits = oldpd->nbits;
364 arg->unclaimed = next_chunk_bits - avail;
365 ASN_DEBUG("!-Parent frame %ld, require %ld, will claim %ld",
366 (long)avail, (long)next_chunk_bits,
367 (long)arg->unclaimed);
369 pd->buffer = oldpd->buffer;
370 pd->nboff = oldpd->nboff;
371 ASN_DEBUG("Refilled pd%s old%s",
372 asn_bit_data_string(pd), asn_bit_data_string(oldpd));
377 per_skip_bits(asn_per_data_t *pd, int skip_nbits) {
378 int hasNonZeroBits = 0;
379 while(skip_nbits > 0) {
382 /* per_get_few_bits() is more efficient when nbits <= 24 */
389 switch(per_get_few_bits(pd, skip)) {
390 case -1: return -1; /* Starving */
391 case 0: continue; /* Skipped empty space */
392 default: hasNonZeroBits = 1; continue;
395 return hasNonZeroBits;
398 static asn_dec_rval_t
399 aper_open_type_get_simple(const asn_codec_ctx_t *ctx,
400 const asn_TYPE_descriptor_t *td,
401 const asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
411 ASN__STACK_OVERFLOW_CHECK(ctx);
413 ASN_DEBUG("Getting open type %s...", td->name);
416 chunk_bytes = aper_get_length(pd, -1, -1, &repeat);
417 if(chunk_bytes < 0) {
421 if(bufLen + chunk_bytes > bufSize) {
423 bufSize = chunk_bytes + (bufSize << 2);
424 ptr = REALLOC(buf, bufSize);
431 if(per_get_many_bits(pd, buf + bufLen, 0, chunk_bytes << 3)) {
435 bufLen += chunk_bytes;
438 ASN_DEBUG("Getting open type %s encoded in %ld bytes", td->name,
441 memset(&spd, 0, sizeof(spd));
443 spd.nbits = bufLen << 3;
445 ASN_DEBUG_INDENT_ADD(+4);
446 rv = td->op->aper_decoder(ctx, td, constraints, sptr, &spd);
447 ASN_DEBUG_INDENT_ADD(-4);
449 if(rv.code == RC_OK) {
450 /* Check padding validity */
451 padding = spd.nbits - spd.nboff;
452 if (((padding > 0 && padding < 8) ||
454 (spd.nboff == 0 && spd.nbits == 8 && spd.buffer == buf)) &&
455 per_get_few_bits(&spd, padding) == 0) {
456 /* Everything is cool */
462 ASN_DEBUG("Too large padding %d in open type", (int)padding);
465 ASN_DEBUG("No padding");
469 /* rv.code could be RC_WMORE, nonsense in this context */
470 rv.code = RC_FAIL; /* Noone would give us more */
477 aper_open_type_put(const asn_TYPE_descriptor_t *td,
478 const asn_per_constraints_t *constraints,
479 const void *sptr, asn_per_outp_t *po) {
485 ASN_DEBUG("Open type put %s ...", td->name);
487 size = aper_encode_to_new_buffer(td, constraints, sptr, &buf);
488 if(size <= 0) return -1;
490 for(bptr = buf, toGo = size; toGo;) {
491 ssize_t maySave = aper_put_length(po, -1, toGo);
492 if(maySave < 0) break;
493 if(per_put_many_bits(po, bptr, maySave * 8)) break;
494 bptr = (char *)bptr + maySave;
501 ASN_DEBUG("Open type put %s of length %ld + overhead (1byte?)",
508 aper_open_type_get(const asn_codec_ctx_t *ctx,
509 const asn_TYPE_descriptor_t *td,
510 const asn_per_constraints_t *constraints,
511 void **sptr, asn_per_data_t *pd) {
513 return aper_open_type_get_simple(ctx, td, constraints, sptr, pd);
517 aper_open_type_skip(const asn_codec_ctx_t *ctx, asn_per_data_t *pd) {
518 asn_TYPE_descriptor_t s_td;
520 asn_TYPE_operation_t op_t;
522 memset(&op_t, 0, sizeof(op_t));
523 s_td.name = "<unknown extension>";
525 s_td.op->aper_decoder = uper_sot_suck;
527 rv = aper_open_type_get(ctx, &s_td, 0, 0, pd);