diff options
Diffstat (limited to 'info.c')
| -rw-r--r-- | info.c | 273 |
1 files changed, 273 insertions, 0 deletions
@@ -0,0 +1,273 @@ +#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); +} |