| /* |
| * 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 <OPEN_TYPE.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) \ |
| ( (((ssize_t)(memb_idx)) > (specs)->ext_after) \ |
| &&(((ssize_t)(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) |
| |
| /* |
| * Return pointer to a member. |
| */ |
| static void ** |
| element_ptrptr(void *struct_ptr, asn_TYPE_member_t *elm, void **tmp_save_ptr) { |
| if(elm->flags & ATF_POINTER) { |
| /* Member is a pointer to another structure */ |
| return (void **)((char *)struct_ptr + elm->memb_offset); |
| } else { |
| assert(tmp_save_ptr); |
| *tmp_save_ptr = (void *)((char *)struct_ptr + elm->memb_offset); |
| return tmp_save_ptr; |
| } |
| } |
| |
| static const void * |
| element_ptr(const void *struct_ptr, const asn_TYPE_member_t *elm) { |
| if(elm->flags & ATF_POINTER) { |
| /* Member is a pointer to another structure */ |
| return *(const void *const *)((const char *)struct_ptr |
| + elm->memb_offset); |
| } else { |
| return (const void *)((const char *)struct_ptr + elm->memb_offset); |
| } |
| } |
| |
| asn_dec_rval_t |
| SEQUENCE_decode_oer(const asn_codec_ctx_t *opt_codec_ctx, |
| const asn_TYPE_descriptor_t *td, |
| const asn_oer_constraints_t *constraints, void **struct_ptr, |
| const void *ptr, size_t size) { |
| const asn_SEQUENCE_specifics_t *specs = |
| (const 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)constraints; |
| |
| /* |
| * 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_bit_data_t)); |
| if(!ctx->ptr) { |
| RETURN(RC_FAIL); |
| } |
| } |
| |
| /* |
| * Start to parse where left previously. |
| */ |
| switch(ctx->phase) { |
| case 0: { |
| /* |
| * Fetch preamble. |
| */ |
| asn_bit_data_t *preamble = ctx->ptr; |
| int has_extensions_bit = (specs->ext_before >= 0); |
| size_t preamble_bits = (has_extensions_bit + specs->roms_count); |
| size_t preamble_bytes = ((7 + preamble_bits) >> 3); |
| uint8_t *pbytes; |
| |
| ASN_DEBUG("OER SEQUENCE %s Decoding PHASE 0", td->name); |
| |
| ASN_DEBUG( |
| "Expecting preamble bits %zu for %s (including %d extension bits)", |
| preamble_bits, td->name, has_extensions_bit); |
| |
| 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_bit; |
| preamble->nbits = preamble_bits; |
| ADVANCE(preamble_bytes); |
| } |
| NEXT_PHASE(ctx); |
| /* FALL THROUGH */ |
| case 1: { |
| /* Decode components of the extension root */ |
| asn_bit_data_t *preamble = ctx->ptr; |
| size_t edx; |
| |
| ASN_DEBUG("OER SEQUENCE %s Decoding PHASE 1", td->name); |
| |
| for(edx = (ctx->step >> 1); edx < td->elements_count; |
| edx++, ctx->step = (ctx->step & ~1) + 2) { |
| asn_TYPE_member_t *elm = &td->elements[edx]; |
| |
| ASN_DEBUG("Decoding %s->%s", td->name, elm->name); |
| |
| if(ctx->step & 1) { |
| goto microphase2_decode_continues; |
| } |
| |
| |
| if(IN_EXTENSION_GROUP(specs, edx)) { |
| /* Ignore non-root components in PHASE 1 */ |
| break; |
| } |
| |
| if(elm->optional) { |
| int32_t present = asn_get_few_bits(preamble, 1); |
| if(present < 0) { |
| ASN_DEBUG("Presence map ended prematurely: %d", present); |
| RETURN(RC_FAIL); |
| } else if(present == 0) { |
| if(elm->default_value_set) { |
| /* Fill-in DEFAULT */ |
| void *tmp; |
| if(elm->default_value_set( |
| element_ptrptr(st, elm, &tmp))) { |
| 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_OPEN_TYPE) { |
| rval = OPEN_TYPE_oer_get(opt_codec_ctx, td, st, elm, ptr, size); |
| } else { |
| void *save_memb_ptr; /* Temporary reference. */ |
| void **memb_ptr2; /* Pointer to a pointer to a memmber */ |
| |
| memb_ptr2 = element_ptrptr(st, elm, &save_memb_ptr); |
| |
| rval = elm->type->op->oer_decoder(opt_codec_ctx, elm->type, |
| elm->encoding_constraints.oer_constraints, |
| memb_ptr2, ptr, size); |
| } |
| switch(rval.code) { |
| case RC_OK: |
| ADVANCE(rval.consumed); |
| break; |
| case RC_WMORE: |
| ASN_DEBUG("More bytes needed at element %s \"%s\"", td->name, |
| elm->name); |
| ADVANCE(rval.consumed); |
| RETURN(RC_WMORE); |
| case RC_FAIL: |
| ASN_DEBUG("Decoding failed at element %s \"%s\"", td->name, |
| elm->name); |
| RETURN(RC_FAIL); |
| } |
| } /* for(all root members) */ |
| |
| } |
| NEXT_PHASE(ctx); |
| /* FALL THROUGH */ |
| case 2: { |
| /* Cleanup preamble. */ |
| asn_bit_data_t *preamble = ctx->ptr; |
| asn_bit_data_t *extadds; |
| int has_extensions_bit = (specs->ext_before >= 0); |
| int extensions_present = |
| has_extensions_bit |
| && (preamble->buffer == NULL |
| || (((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; |
| |
| ASN_DEBUG("OER SEQUENCE %s Decoding PHASE 2", td->name); |
| |
| unconst.cptr = preamble->buffer; |
| FREEMEM(unconst.uptr); |
| preamble->buffer = 0; /* Will do extensions_present==1 next time. */ |
| |
| 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: |
| ASN_DEBUG("OER SEQUENCE %s Decoding PHASE 3", td->name); |
| for(; ctx->step < specs->ext_before - 1; ctx->step++) { |
| asn_bit_data_t *extadds = ctx->ptr; |
| size_t edx = ctx->step; |
| asn_TYPE_member_t *elm = &td->elements[edx]; |
| void **memb_ptr2 = element_ptrptr(st, elm, 0); |
| |
| switch(asn_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_set |
| && elm->default_value_set(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->encoding_constraints.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 */ |
| asn_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: |
| ASN_DEBUG("OER SEQUENCE %s Decoding PHASE 4", td->name); |
| /* Read in the rest of Open Types while ignoring them */ |
| for(;;) { |
| asn_bit_data_t *extadds = ctx->ptr; |
| switch(asn_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 { |
| asn_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(const asn_TYPE_descriptor_t *td, |
| const asn_oer_constraints_t *constraints, const void *sptr, |
| asn_app_consume_bytes_f *cb, void *app_key) { |
| const asn_SEQUENCE_specifics_t *specs = (const asn_SEQUENCE_specifics_t *)td->specifics; |
| size_t computed_size = 0; |
| int has_extensions_bit = (specs->ext_before >= 0); |
| size_t preamble_bits = (has_extensions_bit + specs->roms_count); |
| uint32_t has_extensions = 0; |
| size_t edx; |
| int ret; |
| |
| (void)constraints; |
| |
| if(preamble_bits) { |
| asn_bit_outp_t preamble; |
| |
| memset(&preamble, 0, sizeof(preamble)); |
| preamble.output = cb; |
| preamble.op_key = app_key; |
| |
| if(has_extensions_bit) { |
| for(edx = specs->ext_after + 1; |
| (ssize_t)edx < specs->ext_before - 1; edx++) { |
| asn_TYPE_member_t *elm = &td->elements[edx]; |
| const void *memb_ptr = element_ptr(sptr, elm); |
| if(memb_ptr) { |
| if(elm->default_value_cmp |
| && elm->default_value_cmp(memb_ptr) == 0) { |
| /* Do not encode default values in extensions */ |
| } else { |
| has_extensions = 1; |
| break; |
| } |
| } |
| } |
| ret = asn_put_few_bits(&preamble, has_extensions, 1); |
| assert(ret == 0); |
| if(ret < 0) { |
| ASN__ENCODE_FAILED; |
| } |
| } |
| |
| /* |
| * Encode optional components bitmap. |
| */ |
| if(specs->roms_count) { |
| for(edx = 0; edx < td->elements_count; edx++) { |
| asn_TYPE_member_t *elm = &td->elements[edx]; |
| |
| if(IN_EXTENSION_GROUP(specs, edx)) break; |
| |
| if(elm->optional) { |
| const void *memb_ptr = element_ptr(sptr, elm); |
| uint32_t has_component = memb_ptr != NULL; |
| if(has_component && elm->default_value_cmp |
| && elm->default_value_cmp(&memb_ptr) == 0) { |
| has_component = 0; |
| } |
| ret = asn_put_few_bits(&preamble, has_component, 1); |
| if(ret < 0) { |
| ASN__ENCODE_FAILED; |
| } |
| } |
| } |
| } |
| |
| asn_put_aligned_flush(&preamble); |
| computed_size += preamble.flushed_bytes; |
| } /* if(preamble_bits) */ |
| |
| /* |
| * Put root components and extensions root. |
| */ |
| for(edx = 0; edx < td->elements_count; edx++) { |
| asn_TYPE_member_t *elm = &td->elements[edx]; |
| asn_enc_rval_t er; |
| const void *memb_ptr; |
| |
| if(IN_EXTENSION_GROUP(specs, edx)) break; |
| |
| memb_ptr = element_ptr(sptr, elm); |
| if(memb_ptr) { |
| if(elm->default_value_cmp |
| && elm->default_value_cmp(memb_ptr) == 0) { |
| /* Skip default values in encoding */ |
| continue; |
| } |
| } else { |
| if(elm->optional) continue; |
| /* Mandatory element is missing */ |
| ASN__ENCODE_FAILED; |
| } |
| if(!elm->type->op->oer_encoder) { |
| ASN_DEBUG("OER encoder is not defined for type %s", elm->type->name); |
| ASN__ENCODE_FAILED; |
| } |
| er = elm->type->op->oer_encoder( |
| elm->type, elm->encoding_constraints.oer_constraints, memb_ptr, cb, |
| app_key); |
| if(er.encoded == -1) { |
| ASN_DEBUG("... while encoding %s member \"%s\"\n", td->name, |
| elm->name); |
| return er; |
| } |
| computed_size += er.encoded; |
| } |
| |
| /* |
| * Before encode extensions, encode extensions additions presense bitmap |
| # X.696 (08/2015) #16.4. |
| */ |
| if(has_extensions) { |
| asn_bit_outp_t extadds; |
| |
| /* Special case allowing us to use exactly one byte for #8.6 */ |
| size_t aoms_length_bits = specs->aoms_count; |
| size_t aoms_length_bytes = (7 + aoms_length_bits) >> 3; |
| uint8_t unused_bits = 0x07 & (8 - (aoms_length_bits & 0x07)); |
| |
| assert(1 + aoms_length_bytes <= 127); |
| |
| memset(&extadds, 0, sizeof(extadds)); |
| extadds.output = cb; |
| extadds.op_key = app_key; |
| |
| /* #8.6 length determinant */ |
| ret = asn_put_few_bits(&extadds, (1 + aoms_length_bytes), 8); |
| if(ret < 0) ASN__ENCODE_FAILED; |
| |
| /* Number of unused bytes, #16.4.2 */ |
| ret = asn_put_few_bits(&extadds, unused_bits, 8); |
| if(ret < 0) ASN__ENCODE_FAILED; |
| |
| /* Encode presence bitmap #16.4.3 */ |
| for(edx = specs->ext_after + 1; (ssize_t)edx < specs->ext_before - 1; |
| edx++) { |
| asn_TYPE_member_t *elm = &td->elements[edx]; |
| const void *memb_ptr = element_ptr(sptr, elm); |
| if(memb_ptr && elm->default_value_cmp |
| && elm->default_value_cmp(memb_ptr) == 0) { |
| memb_ptr = 0; /* Do not encode default value. */ |
| } |
| ret |= asn_put_few_bits(&extadds, memb_ptr ? 1 : 0, 1); |
| } |
| if(ret < 0) ASN__ENCODE_FAILED; |
| |
| asn_put_aligned_flush(&extadds); |
| computed_size += extadds.flushed_bytes; |
| |
| /* Now, encode extensions */ |
| for(edx = specs->ext_after + 1; (ssize_t)edx < specs->ext_before - 1; |
| edx++) { |
| asn_TYPE_member_t *elm = &td->elements[edx]; |
| const void *memb_ptr = element_ptr(sptr, elm); |
| |
| if(memb_ptr) { |
| if(elm->default_value_cmp |
| && elm->default_value_cmp(memb_ptr) == 0) { |
| /* Do not encode default value. */ |
| } else { |
| asn_enc_rval_t er = elm->type->op->oer_encoder( |
| elm->type, elm->encoding_constraints.oer_constraints, |
| memb_ptr, cb, app_key); |
| if(er.encoded == -1) { |
| return er; |
| } |
| computed_size += er.encoded; |
| } |
| } else if(!elm->optional) { |
| ASN__ENCODE_FAILED; |
| } |
| } |
| } /* if(has_extensions) */ |
| |
| |
| { |
| asn_enc_rval_t er = {0, 0, 0}; |
| er.encoded = computed_size; |
| ASN__ENCODED_OK(er); |
| } |
| } |
| |
| #endif /* ASN_DISABLE_OER_SUPPORT */ |