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Serialize metadata and geometry to a file

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This commit is contained in:
Eric Fischer 2014-09-16 16:39:56 -07:00
parent a5b8a02ec0
commit 88dc948b6b
1 changed files with 54 additions and 53 deletions

107
geojson.c

@ -21,6 +21,7 @@
#define GEOM_MULTIPOLYGON 5 /* array of arrays of arrays of arrays of positions */
#define GEOM_TYPES 6
#define VT_END 0
#define VT_POINT 1
#define VT_LINE 2
#define VT_POLYGON 3
@ -69,7 +70,25 @@ void latlon2tile(double lat, double lon, int zoom, unsigned int *x, unsigned int
*y = n * (1 - (log(tan(lat_rad) + 1/cos(lat_rad)) / M_PI)) / 2;
}
void parse_geometry(int t, json_object *j, unsigned *bbox, int *n, unsigned **out, int op) {
void serialize_int(FILE *out, int n, long long *fpos) {
fwrite(&n, sizeof(int), 1, out);
*fpos += sizeof(int);
}
void serialize_uint(FILE *out, unsigned n, long long *fpos) {
fwrite(&n, sizeof(unsigned), 1, out);
*fpos += sizeof(unsigned);
}
void serialize_string(FILE *out, char *s, long long *fpos) {
int len = strlen(s);
serialize_int(out, len, fpos);
fwrite(s, sizeof(char), len, out);
*fpos += len;
}
void parse_geometry(int t, json_object *j, unsigned *bbox, long long *fpos, FILE *out, int op) {
if (j == NULL || j->type != JSON_ARRAY) {
fprintf(stderr, "expected array for type %d\n", t);
return;
@ -77,7 +96,6 @@ void parse_geometry(int t, json_object *j, unsigned *bbox, int *n, unsigned **ou
int within = geometry_within[t];
if (within >= 0) {
printf("[");
int i;
for (i = 0; i < j->length; i++) {
if (within == GEOM_POINT) {
@ -88,63 +106,49 @@ void parse_geometry(int t, json_object *j, unsigned *bbox, int *n, unsigned **ou
}
}
parse_geometry(within, j->array[i], bbox, n, out, op);
parse_geometry(within, j->array[i], bbox, fpos, out, op);
}
printf("]");
} else {
if (j->length == 2 && j->array[0]->type == JSON_NUMBER && j->array[1]->type == JSON_NUMBER) {
if (out != NULL || bbox != NULL) {
unsigned x, y;
double lon = j->array[0]->number;
double lat = j->array[1]->number;
latlon2tile(lat, lon, 32, &x, &y);
unsigned x, y;
double lon = j->array[0]->number;
double lat = j->array[1]->number;
latlon2tile(lat, lon, 32, &x, &y);
if (bbox != NULL) {
if (x < bbox[0]) {
bbox[0] = x;
}
if (y < bbox[1]) {
bbox[1] = y;
}
if (x > bbox[2]) {
bbox[2] = x;
}
if (y > bbox[3]) {
bbox[3] = y;
}
if (bbox != NULL) {
if (x < bbox[0]) {
bbox[0] = x;
}
if (out != NULL) {
(*out)[0] = op;
(*out)[1] = x;
(*out)[2] = y;
(*out) += 3;
if (y < bbox[1]) {
bbox[1] = y;
}
if (n != NULL) {
*n += 3;
if (x > bbox[2]) {
bbox[2] = x;
}
if (y > bbox[3]) {
bbox[3] = y;
}
}
printf(" %d %f,%f ", op, j->array[0]->number, j->array[1]->number);
serialize_int(out, op, fpos);
serialize_uint(out, x, fpos);
serialize_uint(out, y, fpos);
} else {
fprintf(stderr, "malformed point");
}
}
if (t == GEOM_POLYGON) {
if (out != NULL) {
(*out)[0] = VT_CLOSEPATH;
(*out) += 1;
}
if (n != NULL) {
*n += 1;
}
printf(" closepath ");
serialize_int(out, VT_CLOSEPATH, fpos);
}
}
void read_json(FILE *f) {
json_pull *jp = json_begin_file(f);
FILE *out = fopen("meta.out", "wb");
long long fpos = 0;
while (1) {
json_object *j = json_read(jp);
if (j == NULL) {
@ -227,23 +231,20 @@ void read_json(FILE *f) {
}
}
unsigned bbox[] = { UINT_MAX, UINT_MAX, 0, 0 };
int n = 0;
printf("%d: ", mb_geometry[t]);
parse_geometry(t, coordinates, bbox, &n, NULL, VT_MOVETO);
printf("\n");
unsigned out[n];
unsigned *end = out;
parse_geometry(t, coordinates, NULL, NULL, &end, VT_MOVETO);
printf("\n-> ");
for (i = 0; i < n; i++) {
printf("%x ", out[i]);
serialize_int(out, m, &fpos);
for (i = 0; i < m; i++) {
serialize_int(out, metatype[i], &fpos);
serialize_string(out, metakey[i], &fpos);
serialize_string(out, metaval[i], &fpos);
}
printf("\n");
unsigned bbox[] = { UINT_MAX, UINT_MAX, 0, 0 };
serialize_int(out, t, &fpos);
parse_geometry(t, coordinates, bbox, &fpos, out, VT_MOVETO);
serialize_int(out, VT_END, &fpos);
printf("%d elements, bbox %x %x %x %x\n", n, bbox[0], bbox[1], bbox[2], bbox[3]);
printf("bbox %x %x %x %x\n", bbox[0], bbox[1], bbox[2], bbox[3]);
}
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