trunk/src/ways.h

/***************************************
 A header file for the ways.

 Part of the Routino routing software.
 ******************/ /******************
 This file Copyright 2008-2011 Andrew M. Bishop

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Affero General Public License for more details.

 You should have received a copy of the GNU Affero General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ***************************************/


#ifndef WAYS_H
#define WAYS_H    /*+ To stop multiple inclusions. +*/

#include <stdint.h>
#include <stdlib.h>

#include "types.h"

#include "files.h"


/* Data structures */


/*+ A structure containing a single way (members ordered to minimise overall size). +*/
struct _Way
{
 index_t      name;             /*+ The offset of the name of the way in the names array. +*/

 transports_t allow;            /*+ The type of traffic allowed on the way. +*/

 highway_t    type;             /*+ The highway type of the way. +*/

 properties_t props;            /*+ The properties of the way. +*/

 speed_t      speed;            /*+ The defined maximum speed limit of the way. +*/

 weight_t     weight;           /*+ The defined maximum weight of traffic on the way. +*/
 height_t     height;           /*+ The defined maximum height of traffic on the way. +*/
 width_t      width;            /*+ The defined maximum width of traffic on the way. +*/
 length_t     length;           /*+ The defined maximum length of traffic on the way. +*/
};


/*+ A structure containing the header from the file. +*/
typedef struct _WaysFile
{
 index_t      number;           /*+ The number of ways stored. +*/
 index_t      onumber;          /*+ The number of ways originally. +*/

 highways_t   highways;         /*+ The types of highways that were seen when parsing. +*/
 transports_t allow;            /*+ The types of traffic that were seen when parsing. +*/
 properties_t props;            /*+ The properties that were seen when parsing. +*/
}
 WaysFile;


/*+ A structure containing a set of ways (and pointers to mmap file). +*/
struct _Ways
{
 WaysFile file;                 /*+ The header data from the file. +*/

#if !SLIM

 void      *data;               /*+ The memory mapped data. +*/

 Way       *ways;               /*+ An array of ways. +*/
 char      *names;              /*+ An array of characters containing the names. +*/

#else

 int        fd;                 /*+ The file descriptor for the file. +*/
 off_t      namesoffset;        /*+ The offset of the names within the file. +*/

 Way        cached[2];          /*+ Two cached nodes read from the file in slim mode. +*/
 index_t    incache[2];         /*+ The indexes of the cached ways. +*/

 char      *ncached;            /*+ The cached way name. +*/
 int        nalloc;             /*+ The amount of memory allocated for the way name. +*/

#endif
};


/* Functions in ways.c */

Ways *LoadWayList(const char *filename);

int WaysCompare(Way *way1,Way *way2);


/* Macros and inline functions */

#if !SLIM

/*+ Return a Way* pointer given a set of ways and an index. +*/
#define LookupWay(xxx,yyy,zzz)     (&(xxx)->ways[yyy])

/*+ Return the name of a way given the Way pointer and a set of ways. +*/
#define WayName(xxx,yyy)           (&(xxx)->names[(yyy)->name])

#else

static Way *LookupWay(Ways *ways,index_t index,int position);

static char *WayName(Ways *ways,Way *way);


/*++++++++++++++++++++++++++++++++++++++
  Find the Way information for a particular way.

  Way *LookupWay Returns a pointer to the cached way information.

  Ways *ways The set of ways to use.

  index_t index The index of the way.

  int position The position in the cache to store the value.
  ++++++++++++++++++++++++++++++++++++++*/

static inline Way *LookupWay(Ways *ways,index_t index,int position)
{
 if(ways->incache[position-1]!=index)
   {
    SeekReadFile(ways->fd,&ways->cached[position-1],sizeof(Way),sizeof(WaysFile)+(off_t)index*sizeof(Way));

    ways->incache[position-1]=index;
   }

 return(&ways->cached[position-1]);
}


/*++++++++++++++++++++++++++++++++++++++
  Find the name of a way.

  char *WayName Returns a pointer to the name of the way.

  Ways *ways The set of ways to use.

  Way *way The Way pointer.
  ++++++++++++++++++++++++++++++++++++++*/

static inline char *WayName(Ways *ways,Way *way)
{
 int n=0;

 SeekFile(ways->fd,ways->namesoffset+way->name);

 if(!ways->ncached)
    ways->ncached=(char*)malloc(32);

 while(1)
   {
    int i;
    int m=ReadFile(ways->fd,ways->ncached+n,32);

    if(m<0)
       break;
    
    for(i=n;i<n+32;i++)
       if(ways->ncached[i]==0)
          goto exitloop;

    n+=32;

    ways->ncached=(char*)realloc((void*)ways->ncached,n+32);
   }

 exitloop:

 return(ways->ncached);
}

#endif


#endif /* WAYS_H */
1	/***************************************
2	A header file for the ways.
3
4	Part of the Routino routing software.
5	****************/ /****************
6	This file Copyright 2008-2011 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 WAYS_H
24	#define WAYS_H /+ To stop multiple inclusions. +/
25
26	#include <stdint.h>
27	#include <stdlib.h>
28
29	#include "types.h"
30
31	#include "files.h"
32
33
34	/* Data structures */
35
36
37	/+ A structure containing a single way (members ordered to minimise overall size). +/
38	struct _Way
39	{
40	index_t name; /+ The offset of the name of the way in the names array. +/
41
42	transports_t allow; /+ The type of traffic allowed on the way. +/
43
44	highway_t type; /+ The highway type of the way. +/
45
46	properties_t props; /+ The properties of the way. +/
47
48	speed_t speed; /+ The defined maximum speed limit of the way. +/
49
50	weight_t weight; /+ The defined maximum weight of traffic on the way. +/
51	height_t height; /+ The defined maximum height of traffic on the way. +/
52	width_t width; /+ The defined maximum width of traffic on the way. +/
53	length_t length; /+ The defined maximum length of traffic on the way. +/
54	};
55
56
57	/+ A structure containing the header from the file. +/
58	typedef struct _WaysFile
59	{
60	index_t number; /+ The number of ways stored. +/
61	index_t onumber; /+ The number of ways originally. +/
62
63	highways_t highways; /+ The types of highways that were seen when parsing. +/
64	transports_t allow; /+ The types of traffic that were seen when parsing. +/
65	properties_t props; /+ The properties that were seen when parsing. +/
66	}
67	WaysFile;
68
69
70	/+ A structure containing a set of ways (and pointers to mmap file). +/
71	struct _Ways
72	{
73	WaysFile file; /+ The header data from the file. +/
74
75	#if !SLIM
76
77	void data; /+ The memory mapped data. +*/
78
79	Way ways; /+ An array of ways. +*/
80	char names; /+ An array of characters containing the names. +*/
81
82	#else
83
84	int fd; /+ The file descriptor for the file. +/
85	off_t namesoffset; /+ The offset of the names within the file. +/
86
87	Way cached[2]; /+ Two cached nodes read from the file in slim mode. +/
88	index_t incache[2]; /+ The indexes of the cached ways. +/
89
90	char ncached; /+ The cached way name. +*/
91	int nalloc; /+ The amount of memory allocated for the way name. +/
92
93	#endif
94	};
95
96
97	/* Functions in ways.c */
98
99	Ways LoadWayList(const char filename);
100
101	int WaysCompare(Way way1,Way way2);
102
103
104	/* Macros and inline functions */
105
106	#if !SLIM
107
108	/+ Return a Way pointer given a set of ways and an index. +*/
109	#define LookupWay(xxx,yyy,zzz) (&(xxx)->ways[yyy])
110
111	/+ Return the name of a way given the Way pointer and a set of ways. +/
112	#define WayName(xxx,yyy) (&(xxx)->names[(yyy)->name])
113
114	#else
115
116	static Way LookupWay(Ways ways,index_t index,int position);
117
118	static char WayName(Ways ways,Way *way);
119
120
121	/*++++++++++++++++++++++++++++++++++++++
122	Find the Way information for a particular way.
123
124	Way *LookupWay Returns a pointer to the cached way information.
125
126	Ways *ways The set of ways to use.
127
128	index_t index The index of the way.
129
130	int position The position in the cache to store the value.
131	++++++++++++++++++++++++++++++++++++++*/
132
133	static inline Way LookupWay(Ways ways,index_t index,int position)
134	{
135	if(ways->incache[position-1]!=index)
136	{
137	SeekReadFile(ways->fd,&ways->cached[position-1],sizeof(Way),sizeof(WaysFile)+(off_t)index*sizeof(Way));
138
139	ways->incache[position-1]=index;
140	}
141
142	return(&ways->cached[position-1]);
143	}
144
145
146	/*++++++++++++++++++++++++++++++++++++++
147	Find the name of a way.
148
149	char *WayName Returns a pointer to the name of the way.
150
151	Ways *ways The set of ways to use.
152
153	Way *way The Way pointer.
154	++++++++++++++++++++++++++++++++++++++*/
155
156	static inline char WayName(Ways ways,Way *way)
157	{
158	int n=0;
159
160	SeekFile(ways->fd,ways->namesoffset+way->name);
161
162	if(!ways->ncached)
163	ways->ncached=(char*)malloc(32);
164
165	while(1)
166	{
167	int i;
168	int m=ReadFile(ways->fd,ways->ncached+n,32);
169
170	if(m<0)
171	break;
172
173	for(i=n;i<n+32;i++)
174	if(ways->ncached[i]==0)
175	goto exitloop;
176
177	n+=32;
178
179	ways->ncached=(char)realloc((void)ways->ncached,n+32);
180	}
181
182	exitloop:
183
184	return(ways->ncached);
185	}
186
187	#endif
188
189
190	#endif /* WAYS_H */