| /* |
| * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. |
| * All rights reserved. |
| * Redistribution and modifications are permitted subject to BSD license. |
| */ |
| #ifndef ASN_DISABLE_OER_SUPPORT |
| |
| #include <asn_internal.h> |
| #include <constr_SEQUENCE.h> |
| #include <errno.h> |
| |
| /* |
| * This macro "eats" the part of the buffer which is definitely "consumed", |
| * i.e. was correctly converted into local representation or rightfully skipped. |
| */ |
| #undef ADVANCE |
| #define ADVANCE(num_bytes) \ |
| do { \ |
| size_t num = num_bytes; \ |
| ptr = ((const char *)ptr) + num; \ |
| size -= num; \ |
| consumed_myself += num; \ |
| } while(0) |
| |
| /* |
| * Switch to the next phase of parsing. |
| */ |
| #undef NEXT_PHASE |
| #undef PHASE_OUT |
| #define NEXT_PHASE(ctx) \ |
| do { \ |
| ctx->phase++; \ |
| ctx->step = 0; \ |
| } while(0) |
| |
| /* |
| * Check whether we are inside the extensions group. |
| */ |
| #define IN_EXTENSION_GROUP(specs, memb_idx) \ |
| ( ((memb_idx) > (specs)->ext_after) \ |
| &&((memb_idx) < (specs)->ext_before)) |
| |
| /* |
| * Return a standardized complex structure. |
| */ |
| #undef RETURN |
| #define RETURN(_code) do { \ |
| rval.code = _code; \ |
| rval.consumed = consumed_myself;\ |
| return rval; \ |
| } while(0) |
| |
| asn_dec_rval_t |
| SEQUENCE_decode_oer(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td, |
| asn_oer_constraints_t *constraints, void **struct_ptr, |
| const void *ptr, size_t size) { |
| asn_SEQUENCE_specifics_t *specs = (asn_SEQUENCE_specifics_t *)td->specifics; |
| asn_dec_rval_t rval = {RC_OK, 0}; |
| void *st = *struct_ptr; /* Target structure */ |
| asn_struct_ctx_t *ctx; /* Decoder context */ |
| size_t consumed_myself = 0; /* Consumed bytes from ptr. */ |
| |
| |
| (void)opt_codec_ctx; |
| (void)specs; |
| |
| /* |
| * Create the target structure if it is not present already. |
| */ |
| if(st == 0) { |
| st = *struct_ptr = CALLOC(1, specs->struct_size); |
| if(st == 0) { |
| RETURN(RC_FAIL); |
| } |
| } |
| |
| /* |
| * Restore parsing context. |
| */ |
| ctx = (asn_struct_ctx_t *)((char *)st + specs->ctx_offset); |
| if(ctx->ptr == 0) { |
| ctx->ptr = CALLOC(1, sizeof(asn_per_data_t)); |
| if(!ctx->ptr) { |
| RETURN(RC_FAIL); |
| } |
| } |
| |
| /* |
| * Start to parse where left previously. |
| */ |
| switch(ctx->phase) { |
| case 0: { |
| /* |
| * Fetch preamble. |
| */ |
| asn_per_data_t *preamble = ctx->ptr; |
| int has_extensions = (specs->ext_before >= 0); |
| size_t preamble_bits = (has_extensions + specs->roms_count); |
| size_t preamble_bytes = (preamble_bits >> 3); |
| uint8_t *pbytes; |
| |
| if(size < preamble_bytes) { |
| ASN__DECODE_STARVED; |
| } |
| |
| pbytes = MALLOC(preamble_bytes + 1); |
| if(!pbytes) { |
| RETURN(RC_FAIL); |
| } |
| preamble->buffer = (const void *)pbytes; |
| memcpy(pbytes, ptr, preamble_bytes); |
| pbytes[preamble_bytes] = '\0'; /* Just in case */ |
| preamble->nboff = has_extensions; |
| preamble->nbits = preamble_bits; |
| ADVANCE(preamble_bytes); |
| } |
| NEXT_PHASE(ctx); |
| /* FALL THROUGH */ |
| case 1: { |
| /* Decode components of the extension root */ |
| asn_per_data_t *preamble = ctx->ptr; |
| size_t edx; |
| |
| for(edx = (ctx->step >> 1); edx < td->elements_count; |
| edx++, ctx->step = (ctx->step & ~1) + 2) { |
| asn_TYPE_member_t *elm = &td->elements[edx]; |
| void **memb_ptr2; /* Pointer to a pointer to a memmber */ |
| |
| if(ctx->step & 1) { |
| goto microphase2_decode_continues; |
| } |
| |
| |
| if(IN_EXTENSION_GROUP(specs, edx)) { |
| /* Ignore non-root components in PHASE 1 */ |
| continue; |
| } |
| |
| if(elm->optional) { |
| int32_t present = per_get_few_bits(preamble, 1); |
| if(present < 0) { |
| RETURN(RC_FAIL); |
| } else if(present == 0) { |
| if(elm->default_value) { |
| if(elm->flags & ATF_POINTER) { |
| /* Member is a pointer to another structure */ |
| memb_ptr2 = |
| (void **)((char *)st + elm->memb_offset); |
| } else { |
| void *memb_ptr = (char *)st + elm->memb_offset; |
| memb_ptr2 = &memb_ptr; |
| } |
| /* Fill-in DEFAULT */ |
| if(elm->default_value(1, memb_ptr2)) { |
| RETURN(RC_FAIL); |
| } |
| } |
| /* The member is not present. */ |
| continue; |
| } |
| /* Present OPTIONAL or DEFAULT component. */ |
| } |
| |
| /* |
| * MICROPHASE 2: Invoke the member-specific decoder. |
| */ |
| ctx->step |= 1; /* Confirm entering next microphase */ |
| microphase2_decode_continues: |
| if(elm->flags & ATF_POINTER) { |
| /* Member is a pointer to another structure */ |
| memb_ptr2 = (void **)((char *)st + elm->memb_offset); |
| } else { |
| void *memb_ptr = (char *)st + elm->memb_offset; |
| memb_ptr2 = &memb_ptr; |
| } |
| |
| rval = elm->type->oer_decoder(opt_codec_ctx, elm->type, |
| elm->oer_constraints, memb_ptr2, ptr, |
| size); |
| switch(rval.code) { |
| case RC_OK: |
| ADVANCE(rval.consumed); |
| break; |
| case RC_WMORE: |
| ADVANCE(rval.consumed); |
| RETURN(RC_WMORE); |
| case RC_FAIL: |
| RETURN(RC_FAIL); |
| } |
| } /* for(all root members) */ |
| |
| } |
| NEXT_PHASE(ctx); |
| /* FALL THROUGH */ |
| case 2: { |
| /* Cleanup preamble. */ |
| asn_per_data_t *preamble = ctx->ptr; |
| asn_per_data_t *extadds; |
| int has_extensions = (specs->ext_before >= 0); |
| int extensions_present = |
| has_extensions && (((const uint8_t *)preamble->buffer)[0] & 0x80); |
| uint8_t unused_bits; |
| size_t len = 0; |
| ssize_t len_len; |
| uint8_t *ebytes; |
| |
| union { |
| const uint8_t *cptr; |
| uint8_t *uptr; |
| } unconst; |
| unconst.cptr = preamble->buffer; |
| FREEMEM(unconst.uptr); |
| preamble->buffer = 0; |
| |
| if(!extensions_present) { |
| ctx->phase = 10; |
| RETURN(RC_OK); |
| } |
| |
| /* |
| * X.696 (08/2015) #16.1 (c), #16.4 |
| * Read in the extension addition presence bitmap. |
| */ |
| |
| len_len = oer_fetch_length(ptr, size, &len); |
| if(len_len > 0) { |
| ADVANCE(len_len); |
| } if(len_len < 0) { |
| RETURN(RC_FAIL); |
| } else { |
| RETURN(RC_WMORE); |
| } |
| |
| if(len == 0) { |
| /* 16.4.1-2 */ |
| RETURN(RC_FAIL); |
| } else if(len > size) { |
| RETURN(RC_WMORE); |
| } |
| |
| /* Account for unused bits */ |
| unused_bits = 0x7 & *(const uint8_t *)ptr; |
| ADVANCE(1); |
| len--; |
| if(unused_bits && len == 0) { |
| RETURN(RC_FAIL); |
| } |
| |
| /* Get the extensions map */ |
| ebytes = MALLOC(len + 1); |
| if(!ebytes) { |
| RETURN(RC_FAIL); |
| } |
| memcpy(ebytes, ptr, len); |
| ebytes[len] = '\0'; |
| |
| extadds = preamble; |
| memset(extadds, 0, sizeof(*extadds)); |
| extadds->buffer = ebytes; |
| extadds->nboff = 0; |
| extadds->nbits = 8 * len - unused_bits; |
| |
| ADVANCE(len); |
| } |
| NEXT_PHASE(ctx); |
| ctx->step = (specs->ext_after + 1); |
| /* Fall through */ |
| case 3: |
| for(; ctx->step < specs->ext_before; ctx->step++) { |
| asn_per_data_t *extadds = ctx->ptr; |
| size_t edx = ctx->step; |
| asn_TYPE_member_t *elm = &td->elements[edx]; |
| void **memb_ptr2; |
| |
| if(elm->flags & ATF_POINTER) { |
| /* Member is a pointer to another structure */ |
| memb_ptr2 = (void **)((char *)st + elm->memb_offset); |
| } else { |
| void *memb_ptr = (char *)st + elm->memb_offset; |
| memb_ptr2 = &memb_ptr; |
| assert(elm->flags & ATF_POINTER); /* Extensions are indirect */ |
| } |
| |
| switch(per_get_few_bits(extadds, 1)) { |
| case -1: |
| /* |
| * Not every one of our extensions is known to the remote side. |
| * Continue filling in their defaults though. |
| */ |
| /* Fall through */ |
| case 0: |
| /* Fill-in DEFAULT */ |
| if(elm->default_value && elm->default_value(1, memb_ptr2)) { |
| RETURN(RC_FAIL); |
| } |
| continue; |
| case 1: { |
| /* Read OER open type */ |
| ssize_t ot_size = oer_open_type_get(opt_codec_ctx, elm->type, |
| elm->oer_constraints, |
| memb_ptr2, ptr, size); |
| if(ot_size > 0) { |
| ADVANCE(ot_size); |
| } else if(ot_size < 0) { |
| RETURN(RC_FAIL); |
| } else { |
| /* Roll back open type parsing */ |
| per_get_undo(extadds, 1); |
| ASN_STRUCT_FREE(*elm->type, *memb_ptr2); |
| *memb_ptr2 = NULL; |
| RETURN(RC_WMORE); |
| } |
| break; |
| } |
| default: |
| RETURN(RC_FAIL); |
| } |
| } |
| |
| NEXT_PHASE(ctx); |
| /* Fall through */ |
| case 4: |
| /* Read in the rest of Open Types while ignoring them */ |
| for(;;) { |
| asn_per_data_t *extadds = ctx->ptr; |
| switch(per_get_few_bits(extadds, 1)) { |
| case 0: |
| continue; |
| case 1: { |
| ssize_t skipped = oer_open_type_skip(ptr, size); |
| if(skipped > 0) { |
| ADVANCE(skipped); |
| } else if(skipped < 0) { |
| RETURN(RC_FAIL); |
| } else { |
| per_get_undo(extadds, 1); |
| RETURN(RC_WMORE); |
| } |
| continue; |
| } |
| case -1: |
| /* No more Open Type encoded components */ |
| break; |
| default: |
| RETURN(RC_FAIL); |
| } |
| break; |
| } |
| } |
| |
| return rval; |
| } |
| |
| /* |
| * Encode as Canonical OER. |
| */ |
| asn_enc_rval_t |
| SEQUENCE_encode_oer(asn_TYPE_descriptor_t *td, |
| asn_oer_constraints_t *constraints, void *sptr, |
| asn_app_consume_bytes_f *cb, void *app_key) { |
| asn_enc_rval_t er; |
| const uint8_t *buf; |
| const uint8_t *end; |
| size_t useful_bytes; |
| size_t req_bytes = 0; |
| int encode_as_unsigned; |
| int sign = 0; |
| |
| er.encoded = -1; |
| |
| return er; |
| } |
| |
| #endif /* ASN_DISABLE_OER_SUPPORT */ |