constr_sequence_of.c

RSA加密/解密算法源码 asn1c-0.9.12

/*-
 * Copyright (c) 2003, 2004 Lev Walkin <[e-mail]>. All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
#include <asn_internal.h>
#include <constr_SEQUENCE_OF.h>
#include <asn_SEQUENCE_OF.h>

/*
 * The DER encoder of the SEQUENCE OF type.
 */
asn_enc_rval_t
SEQUENCE_OF_encode_der(asn_TYPE_descriptor_t *td, void *ptr,
	int tag_mode, ber_tlv_tag_t tag,
	asn_app_consume_bytes_f *cb, void *app_key) {
	asn_TYPE_member_t *elm = td->elements;
	A_SEQUENCE_OF(void) *list;
	size_t computed_size = 0;
	ssize_t encoding_size = 0;
	asn_enc_rval_t erval;
	int edx;

	ASN_DEBUG("Estimating size of SEQUENCE OF %s", td->name);

	/*
	 * Gather the length of the underlying members sequence.
	 */
	(void *)list = ptr;
	for(edx = 0; edx < list->count; edx++) {
		void *memb_ptr = list->array[edx];
		erval = elm->type->der_encoder(elm->type, memb_ptr,
			0, elm->tag,
			0, 0);
		if(erval.encoded == -1)
			return erval;
		computed_size += erval.encoded;
	}

	/*
	 * Encode the TLV for the sequence itself.
	 */
	encoding_size = der_write_tags(td, computed_size, tag_mode, 1, tag,
		cb, app_key);
	if(encoding_size == -1) {
		erval.encoded = -1;
		erval.failed_type = td;
		erval.structure_ptr = ptr;
		return erval;
	}

	computed_size += encoding_size;
	if(!cb) {
		erval.encoded = computed_size;
		return erval;
	}

	ASN_DEBUG("Encoding members of SEQUENCE OF %s", td->name);

	/*
	 * Encode all members.
	 */
	for(edx = 0; edx < list->count; edx++) {
		void *memb_ptr = list->array[edx];
		erval = elm->type->der_encoder(elm->type, memb_ptr,
			0, elm->tag,
			cb, app_key);
		if(erval.encoded == -1)
			return erval;
		encoding_size += erval.encoded;
	}

	if(computed_size != (size_t)encoding_size) {
		/*
		 * Encoded size is not equal to the computed size.
		 */
		erval.encoded = -1;
		erval.failed_type = td;
		erval.structure_ptr = ptr;
	} else {
		erval.encoded = computed_size;
	}

	return erval;
}

asn_enc_rval_t
SEQUENCE_OF_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
	int ilevel, enum xer_encoder_flags_e flags,
		asn_app_consume_bytes_f *cb, void *app_key) {
	asn_enc_rval_t er;
        asn_SET_OF_specifics_t *specs = (asn_SET_OF_specifics_t *)td->specifics;
	asn_TYPE_member_t *element = td->elements;
	A_SEQUENCE_OF(void) *list;
	const char *mname = specs->as_XMLValueList
		? 0 : ((*element->name)
			? element->name : element->type->xml_tag);
	unsigned int mlen = mname ? strlen(mname) : 0;
	int xcan = (flags & XER_F_CANONICAL);
	int i;

	if(!sptr) _ASN_ENCODE_FAILED;

	er.encoded = 0;

	(void *)list = sptr;
	for(i = 0; i < list->count; i++) {
		asn_enc_rval_t tmper;

		void *memb_ptr = list->array[i];
		if(!memb_ptr) continue;

		if(mname) {
			if(!xcan) _i_ASN_TEXT_INDENT(1, ilevel);
			_ASN_CALLBACK3("<", 1, mname, mlen, ">", 1);
		}

		tmper = element->type->xer_encoder(element->type, memb_ptr,
				ilevel + 1, flags, cb, app_key);
		if(tmper.encoded == -1) return tmper;
                if(tmper.encoded == 0 && specs->as_XMLValueList) {
                        const char *name = (*element->name)
                                ? element->name : element->type->xml_tag;
			size_t len = strlen(name);
			if(!xcan) _i_ASN_TEXT_INDENT(1, ilevel + 1);
			_ASN_CALLBACK3("<", 1, name, len, "/>", 2);
                }

		if(mname) {
			_ASN_CALLBACK3("</", 2, mname, mlen, ">", 1);
			er.encoded += 5;
		}

		er.encoded += (2 * mlen) + tmper.encoded;
	}

	if(!xcan) _i_ASN_TEXT_INDENT(1, ilevel - 1);

	return er;
cb_failed:
	_ASN_ENCODE_FAILED;
}