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#include <u.h>
#include <libc.h>
#include <bio.h>
typedef struct Coord Coord;
typedef struct BBox BBox;
typedef struct MFHeader MFHeader;
typedef struct Tag Tag;
struct Coord {
double lat;
double lon;
};
struct BBox {
Coord min;
Coord max;
};
struct Tag {
int key;
char *val;
};
struct MFHeader {
char magic[21]; /* magic sequence */
uint size; /* header size */
uint fversion; /* file version */
uvlong fsize; /* file size */
uvlong dob; /* date of creation */
BBox bbox; /* map boundaries */
ushort tsize; /* tile size */
char *projection; /* Mercator or nothing */
uchar flags;
Coord pos0; /* map initial position */
uchar zoom0; /* map initial zoom level */
char *lang; /* language preference */
char *comment;
char *author;
Tag *pois; /* places of interest */
Tag *ways; /* ways */
};
enum {
Fdebug = 0x80,
Fpos0 = 0x40,
Fzoom0 = 0x20,
Flang = 0x10,
Fcomment = 0x08,
Fauthor = 0x04
};
void
usage(void)
{
fprint(2, "usage: info [mapfile]\n");
exits("usage");
}
ushort
get16(uchar *a)
{
return (a[0]<<8) | a[1];
}
uint
get32(uchar *a)
{
return (a[0]<<24) | (a[1]<<16) | (a[2]<<8) | a[3];
}
uvlong
get64(uchar *a)
{
uvlong n;
n = get32(a);
return n<<32 | get32(a+4);
}
uint
readuvarint(Biobuf *b)
{
uint n, shift;
uchar x;
n = shift = 0;
if(Bread(b, &x, 1) != 1)
sysfatal("readuvarint: %r");
while(x & 0x80){
n |= (x & ~0x80) << shift;
shift += 7;
Bread(b, &x, 1);
}
return n |= x;
}
char *
readstr(Biobuf *b)
{
uint len;
char *s;
len = readuvarint(b);
s = malloc(len+1);
if(Bread(b, s, len) != len)
sysfatal("readstr: %r");
s[len] = 0;
return s;
}
double
todeg(long μd)
{
double d;
d = μd / 1000000.;
return d;
}
Coord
getcoord(uchar *a)
{
Coord c;
uchar *s;
s = a;
c.lat = todeg(get32(s));
s += 4;
c.lon = todeg(get32(s));
return c;
}
BBox
getbbox(uchar *a)
{
BBox bbox;
uchar *s;
s = a;
bbox.min = getcoord(s);
s += 8;
bbox.max = getcoord(s);
return bbox;
}
Tag *
gettags(Biobuf *b)
{
Tag *t;
uchar x[2];
int len, i;
if(Bread(b, x, 2) != 2)
sysfatal("gettags: %r");
len = get16(x);
t = malloc((len+1)*sizeof(Tag));
for(i = 0; i < len; i++)
t[i].val = readstr(b);
t[len].val = nil;
return t;
}
void
main(int argc, char *argv[])
{
Biobuf bin;
Tag *tp;
uchar buf[512];
int fd;
MFHeader h;
if(argc < 2)
fd = 0;
else{
fd = open(argv[1], OREAD);
if(fd < 0)
sysfatal("open: %r");
}
if(Binit(&bin, fd, OREAD) < 0)
sysfatal("Binit: %r");
if(Bread(&bin, buf, 20) != 20)
sysfatal("wrong magic value");
strncpy(h.magic, (char *)buf, 20);
h.magic[20] = 0;
if(Bread(&bin, buf, 4) != 4)
sysfatal("couldn't read header size");
h.size = get32(buf);
if(Bread(&bin, buf, 4) != 4)
sysfatal("couldn't read file version");
h.fversion = get32(buf);
if(Bread(&bin, buf, 8) != 8)
sysfatal("couldn't get file size");
h.fsize = get64(buf);
if(Bread(&bin, buf, 8) != 8)
sysfatal("couldn't get date of creation");
h.dob = get64(buf);
if(Bread(&bin, buf, 16) != 16)
sysfatal("couldn't get bbox");
h.bbox = getbbox(buf);
if(Bread(&bin, buf, 2) != 2)
sysfatal("couldn't get tile size");
h.tsize = get16(buf);
h.projection = readstr(&bin);
if(Bread(&bin, &h.flags, 1) != 1)
sysfatal("couldn't get flags");
if(h.flags & Fpos0){
if(Bread(&bin, buf, 8) != 8)
sysfatal("couldn't get pos0");
h.pos0 = getcoord(buf);
}
if(h.flags & Fzoom0)
Bread(&bin, &h.zoom0, 1);
if(h.flags & Flang)
h.lang = readstr(&bin);
if(h.flags & Fcomment)
h.comment = readstr(&bin);
if(h.flags & Fauthor)
h.author = readstr(&bin);
h.pois = gettags(&bin);
h.ways = gettags(&bin);
Bterm(&bin);
print("Mapsforge Header Information\n");
print("magic: %s\n", h.magic);
print("header size: %d bytes\n", h.size);
print("version: %d\n", h.fversion);
print("file size: %llud bytes\n", h.fsize);
print("created: %s", ctime(h.dob));
print("bbox: (%g°N, %g°E)(%g°N, %g°E)\n",
h.bbox.min.lat, h.bbox.min.lon,
h.bbox.max.lat, h.bbox.max.lon);
print("tile size: %d\n", h.tsize);
print("projection: %s\n", h.projection);
print("flags:");
if(h.flags & Fdebug) print(" debug");
if(h.flags & Fpos0) print(" pos0");
if(h.flags & Fzoom0) print(" zoom0");
if(h.flags & Flang) print(" lang");
if(h.flags & Fcomment) print(" comment");
if(h.flags & Fauthor) print(" author");
print("\n");
if(h.flags & Fpos0) print("pos0: (%g°N, %g°E)\n", h.pos0.lat, h.pos0.lon);
if(h.flags & Fzoom0) print("zoom0: %d\n", h.zoom0);
if(h.flags & Flang) print("lang: %s\n", h.lang);
if(h.flags & Fcomment) print("comment: %s\n", h.comment);
if(h.flags & Fauthor) print("author: %s\n", h.author);
print("pois:\n");
for(tp = h.pois; tp->val != nil; tp++)
print("\t%s\n", tp->val);
print("ways:\n");
for(tp = h.ways; tp->val != nil; tp++)
print("\t%s\n", tp->val);
close(fd);
exits(0);
}
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