177 lines
6.3 KiB
C
177 lines
6.3 KiB
C
/**
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* @file NCDValCons.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef BADVPN_NCDVALCONS_H
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#define BADVPN_NCDVALCONS_H
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#include <limits.h>
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#include <stdint.h>
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#include <misc/debug.h>
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#include <ncd/NCDVal.h>
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struct NCDValCons__temp_elem {
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NCDValSafeRef ref;
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int next;
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};
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/**
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* Value constructor; implements a mechanism for efficiently constructing
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* NCD values into {@link NCDVal} compact representation, but without
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* having to know the number of list or map elements in advance.
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* For the purpose of value construction, values are representing using
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* {@link NCDValConsVal} objects.
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*/
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typedef struct {
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NCDValMem *mem;
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struct NCDValCons__temp_elem *elems;
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int elems_size;
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int elems_capacity;
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} NCDValCons;
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#define NCDVALCONS_TYPE_COMPLETE 1
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#define NCDVALCONS_TYPE_INCOMPLETE_LIST 2
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#define NCDVALCONS_TYPE_INCOMPLETE_MAP 3
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/**
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* Abstract handle which represents a value during constuction via
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* {@link NCDValCons}.
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*/
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typedef struct {
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int cons_type;
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union {
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NCDValSafeRef complete_ref;
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struct {
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int elems_idx;
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int count;
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} incomplete;
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} u;
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} NCDValConsVal;
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#define NCDVALCONS_ERROR_MEMORY 1
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#define NCDVALCONS_ERROR_DUPLICATE_KEY 2
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#define NCDVALCONS_ERROR_DEPTH 3
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/**
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* Initializes a value constructor.
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*
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* @param o value constructor to initialize
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* @param mem memory object where values will be stored into
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* @return 1 on success, 0 on failure
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*/
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int NCDValCons_Init (NCDValCons *o, NCDValMem *mem) WARN_UNUSED;
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/**
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* Frees the value constructor. This only means the constuctor does
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* not exist any more; any values constructed and completed using
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* {@link NCDValCons_Complete} remain in the memory object.
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*
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* @param o value constructor to free
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*/
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void NCDValCons_Free (NCDValCons *o);
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/**
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* Creates a new string value with the given data.
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*
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* @param o value constructor
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* @param data pointer to string data. This must not point into the
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* memory object the value constructor is using. The data
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* is copied.
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* @param len length of the string
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* @param out on success, *out will be set to a handle representing
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* the new string
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* @param out_error on failure, *out_error will be set to an error code
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* @return 1 on success, 0 on failure
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*/
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int NCDValCons_NewString (NCDValCons *o, const uint8_t *data, size_t len, NCDValConsVal *out, int *out_error) WARN_UNUSED;
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/**
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* Creates an empty list value.
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*
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* @param o value constructor
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* @param out *out will be set to a handle representing the new list
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*/
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void NCDValCons_NewList (NCDValCons *o, NCDValConsVal *out);
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/**
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* Creates an empty map value.
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*
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* @param o value constructor
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* @param out *out will be set to a handle representing the new map
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*/
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void NCDValCons_NewMap (NCDValCons *o, NCDValConsVal *out);
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/**
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* Prepends an element to a list value.
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*
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* @param o value constructor
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* @param list pointer to the handle representing the list. On success,
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* the handle will be modified, and the old handle must not
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* be used any more.
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* @param elem handle representing the value to be prepended. This handle
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* must not be used any more after being prepended to the list.
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* @param out_error on failure, *out_error will be set to an error code
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* @return 1 on success, 0 on failure
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*/
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int NCDValCons_ListPrepend (NCDValCons *o, NCDValConsVal *list, NCDValConsVal elem, int *out_error) WARN_UNUSED;
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/**
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* Inserts an entry into a map value.
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*
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* @param o value constructor
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* @param map pointer to the handle representing the map. On success,
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* the handle will be modified, and the old handle must not
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* be used any more.
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* @param key handle representing the key of the entry. This handle
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* must not be used any more after being inserted into the map.
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* @param value handle representing the value of the entry. This handle
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* must not be used any more after being inserted into the
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* map.
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* @param out_error on failure, *out_error will be set to an error code
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* @return 1 on success, 0 on failure
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*/
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int NCDValCons_MapInsert (NCDValCons *o, NCDValConsVal *map, NCDValConsVal key, NCDValConsVal value, int *out_error) WARN_UNUSED;
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/**
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* Completes a value represented by a {@link NCDValConsVal} handle,
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* producing a {@link NCDValRef} object which refers to this value within
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* the memory object.
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*
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* @param o value constructor
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* @param val handle representing the value to be completed. After a value
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* is completed, the handle must not be used any more.
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* @param out on success, *out will be set to a {@link NCDValRef} object
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* referencing the completed value
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* @param out_error on failure, *out_error will be set to an error code
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* @return 1 on success, 0 on failure
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*/
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int NCDValCons_Complete (NCDValCons *o, NCDValConsVal val, NCDValRef *out, int *out_error) WARN_UNUSED;
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#endif
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