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197 lines
4.7 KiB
C
197 lines
4.7 KiB
C
#ifndef PSYC_PACKET_H
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/**
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* @file psyc/packet.h
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* @brief Interface for PSYC packet data structures.
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*
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* Packet data structures and functions for creating them are defined here.
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*/
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/**
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* @defgroup packet Packet data structures
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*
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* This module contains definitions of packet data structures and functions for
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* creating them.
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* @{
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*/
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#include <psyc.h>
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#include <psyc/syntax.h>
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#include <math.h>
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/** Modifier flags. */
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typedef enum
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{
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/// Modifier needs to be checked if it needs length.
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PSYC_MODIFIER_CHECK_LENGTH = 0,
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/// Modifier needs length.
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PSYC_MODIFIER_NEED_LENGTH = 1,
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/// Modifier doesn't need length.
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PSYC_MODIFIER_NO_LENGTH = 2,
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/// Routing modifier, which implies that it doesn't need length.
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PSYC_MODIFIER_ROUTING = 3,
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} PsycModifierFlag;
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/** List flags. */
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typedef enum
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{
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/// List needs to be checked if it needs length.
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PSYC_LIST_CHECK_LENGTH = 0,
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/// List needs length.
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PSYC_LIST_NEED_LENGTH = 1,
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/// List doesn't need length.
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PSYC_LIST_NO_LENGTH = 2,
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} PsycListFlag;
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/** Packet flags. */
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typedef enum
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{
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/// Packet needs to be checked if it needs content length.
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PSYC_PACKET_CHECK_LENGTH = 0,
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/// Packet needs content length.
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PSYC_PACKET_NEED_LENGTH = 1,
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/// Packet doesn't need content length.
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PSYC_PACKET_NO_LENGTH = 2,
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} PsycPacketFlag;
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typedef enum
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{
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PSYC_OPERATOR_SET = ':',
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PSYC_OPERATOR_ASSIGN = '=',
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PSYC_OPERATOR_AUGMENT = '+',
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PSYC_OPERATOR_DIMINISH = '-',
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PSYC_OPERATOR_QUERY = '?',
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} PsycOperator;
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/** Structure for a modifier. */
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typedef struct
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{
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char oper;
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PsycString name;
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PsycString value;
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PsycModifierFlag flag;
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} PsycModifier;
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/** Structure for an entity or routing header. */
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typedef struct
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{
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size_t lines;
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PsycModifier *modifiers;
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} PsycHeader;
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/** Structure for a list. */
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typedef struct
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{
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size_t num_elems;
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PsycString *elems;
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size_t length;
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PsycListFlag flag;
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} PsycList;
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/** Intermediate struct for a PSYC packet */
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typedef struct
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{
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PsycHeader routing; ///< Routing header.
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PsycHeader entity; ///< Entity header.
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PsycString method; ///< Contains the method.
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PsycString data; ///< Contains the data.
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PsycString content; ///< Contains the whole content.
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size_t routingLength; ///< Length of routing part.
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size_t contentLength; ///< Length of content part.
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size_t length; ///< Total length of packet.
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PsycPacketFlag flag; ///< Packet flag.
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} PsycPacket;
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/**
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* Return the number of digits a number has in its base 10 representation.
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*/
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static inline
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size_t psyc_num_length (size_t n)
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{
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return n < 10 ? 1 : log10(n) + 1;
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}
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/**
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* \internal
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* Check if a modifier needs length.
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*/
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static inline
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PsycModifierFlag psyc_modifier_length_check (PsycModifier *m)
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{
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PsycModifierFlag flag;
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if (m->value.length > PSYC_MODIFIER_SIZE_THRESHOLD)
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flag = PSYC_MODIFIER_NEED_LENGTH;
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else if (memchr(m->value.data, (int)'\n', m->value.length))
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flag = PSYC_MODIFIER_NEED_LENGTH;
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else
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flag = PSYC_MODIFIER_NO_LENGTH;
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return flag;
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}
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/** Initialize modifier */
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static inline
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void psyc_modifier_init (PsycModifier *m, char oper,
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char *name, size_t namelen,
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char *value, size_t valuelen,
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PsycModifierFlag flag)
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{
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*m = (PsycModifier) {oper, {namelen, name}, {valuelen, value}, flag};
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if (flag == PSYC_MODIFIER_CHECK_LENGTH) // find out if it needs a length
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m->flag = psyc_modifier_length_check(m);
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}
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/**
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* \internal
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* Get the total length of a modifier when rendered.
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*/
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size_t psyc_modifier_length (PsycModifier *m);
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/**
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* \internal
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* Check if a list needs length.
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*/
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PsycListFlag psyc_list_length_check (PsycList *list);
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/**
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* \internal
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* Get the total length of a list when rendered.
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*/
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PsycListFlag psyc_list_length (PsycList *list);
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/**
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* \internal
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* Check if a packet needs length.
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*/
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PsycPacketFlag psyc_packet_length_check (PsycPacket *p);
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/**
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* Calculate and set the rendered length of packet parts and total packet length.
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*/
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size_t psyc_packet_length_set (PsycPacket *p);
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/** Initialize list. */
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void psyc_list_init (PsycList *list, PsycString *elems, size_t num_elems,
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PsycListFlag flag);
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/** Initialize packet. */
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void psyc_packet_init (PsycPacket *packet,
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PsycModifier *routing, size_t routinglen,
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PsycModifier *entity, size_t entitylen,
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char *method, size_t methodlen,
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char *data, size_t datalen,
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PsycPacketFlag flag);
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/** Initialize packet with raw content. */
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void psyc_packet_init_raw (PsycPacket *packet,
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PsycModifier *routing, size_t routinglen,
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char *content, size_t contentlen,
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PsycPacketFlag flag);
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/** @} */ // end of packet group
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#define PSYC_PACKET_H
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#endif
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