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Sat Jan 28 14:40:54 2012 UTC (13 years, 2 months ago) by amb
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Sat Jan 28 14:40:54 2012 UTC (13 years, 2 months ago) by amb
File MIME type: text/x-chdr
File size: 4090 byte(s)
Simplify and standardise the included headers.
| 1 | /*************************************** |
| 2 | A header file for the relations. |
| 3 | |
| 4 | Part of the Routino routing software. |
| 5 | ******************/ /****************** |
| 6 | This file Copyright 2008-2012 Andrew M. Bishop |
| 7 | |
| 8 | This program is free software: you can redistribute it and/or modify |
| 9 | it under the terms of the GNU Affero General Public License as published by |
| 10 | the Free Software Foundation, either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU Affero General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU Affero General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | ***************************************/ |
| 21 | |
| 22 | |
| 23 | #ifndef RELATIONS_H |
| 24 | #define RELATIONS_H /*+ To stop multiple inclusions. +*/ |
| 25 | |
| 26 | #include <stdint.h> |
| 27 | #include <sys/types.h> |
| 28 | |
| 29 | #include "types.h" |
| 30 | |
| 31 | #include "files.h" |
| 32 | #include "profiles.h" |
| 33 | |
| 34 | |
| 35 | /* Data structures */ |
| 36 | |
| 37 | |
| 38 | /*+ A structure containing a single relation. +*/ |
| 39 | struct _TurnRelation |
| 40 | { |
| 41 | index_t from; /*+ The segment that the path comes from. +*/ |
| 42 | index_t via; /*+ The node that the path goes via. +*/ |
| 43 | index_t to; /*+ The segment that the path goes to. +*/ |
| 44 | |
| 45 | transports_t except; /*+ The types of transports that that this relation does not apply to. +*/ |
| 46 | }; |
| 47 | |
| 48 | |
| 49 | /*+ A structure containing the header from the file. +*/ |
| 50 | typedef struct _RelationsFile |
| 51 | { |
| 52 | index_t trnumber; /*+ The number of turn relations in total. +*/ |
| 53 | } |
| 54 | RelationsFile; |
| 55 | |
| 56 | |
| 57 | /*+ A structure containing a set of relations (and pointers to mmap file). +*/ |
| 58 | struct _Relations |
| 59 | { |
| 60 | RelationsFile file; /*+ The header data from the file. +*/ |
| 61 | |
| 62 | #if !SLIM |
| 63 | |
| 64 | void *data; /*+ The memory mapped data. +*/ |
| 65 | |
| 66 | TurnRelation *turnrelations; /*+ An array of nodes. +*/ |
| 67 | |
| 68 | #else |
| 69 | |
| 70 | int fd; /*+ The file descriptor for the file. +*/ |
| 71 | |
| 72 | off_t troffset; /*+ The offset of the turn relations in the file. +*/ |
| 73 | |
| 74 | TurnRelation cached[2]; /*+ Two cached relations read from the file in slim mode. +*/ |
| 75 | index_t incache[2]; /*+ The indexes of the cached relations. +*/ |
| 76 | |
| 77 | #endif |
| 78 | |
| 79 | index_t via_start; /*+ The first via node in the file. +*/ |
| 80 | index_t via_end; /*+ The last via node in the file. +*/ |
| 81 | }; |
| 82 | |
| 83 | |
| 84 | /* Functions in relations.c */ |
| 85 | |
| 86 | Relations *LoadRelationList(const char *filename); |
| 87 | |
| 88 | index_t FindFirstTurnRelation1(Relations *relations,index_t via); |
| 89 | index_t FindNextTurnRelation1(Relations *relations,index_t current); |
| 90 | |
| 91 | index_t FindFirstTurnRelation2(Relations *relations,index_t via,index_t from); |
| 92 | index_t FindNextTurnRelation2(Relations *relations,index_t current); |
| 93 | |
| 94 | int IsTurnAllowed(Relations *relations,index_t index,index_t via,index_t from,index_t to,transports_t transport); |
| 95 | |
| 96 | |
| 97 | /* Macros and inline functions */ |
| 98 | |
| 99 | #if !SLIM |
| 100 | |
| 101 | /*+ Return a Relation pointer given a set of relations and an index. +*/ |
| 102 | #define LookupTurnRelation(xxx,yyy,ppp) (&(xxx)->turnrelations[yyy]) |
| 103 | |
| 104 | #else |
| 105 | |
| 106 | static TurnRelation *LookupTurnRelation(Relations *relations,index_t index,int position); |
| 107 | |
| 108 | |
| 109 | /*++++++++++++++++++++++++++++++++++++++ |
| 110 | Find the Relation information for a particular relation. |
| 111 | |
| 112 | TurnRelation *LookupTurnRelation Returns a pointer to the cached relation information. |
| 113 | |
| 114 | Relations *relations The set of relations to use. |
| 115 | |
| 116 | index_t index The index of the relation. |
| 117 | |
| 118 | int position The position in the cache to store this result. |
| 119 | ++++++++++++++++++++++++++++++++++++++*/ |
| 120 | |
| 121 | static inline TurnRelation *LookupTurnRelation(Relations *relations,index_t index,int position) |
| 122 | { |
| 123 | if(relations->incache[position-1]!=index) |
| 124 | { |
| 125 | SeekReadFile(relations->fd,&relations->cached[position-1],sizeof(TurnRelation),relations->troffset+(off_t)index*sizeof(TurnRelation)); |
| 126 | |
| 127 | relations->incache[position-1]=index; |
| 128 | } |
| 129 | |
| 130 | return(&relations->cached[position-1]); |
| 131 | } |
| 132 | |
| 133 | #endif |
| 134 | |
| 135 | |
| 136 | #endif /* RELATIONS_H */ |