Revision f9d1e87360949df25881d1d21736273fe6382e47 authored by Eric Fischer on 17 December 2015, 00:18:16 UTC, committed by Eric Fischer on 17 December 2015, 00:18:16 UTC
1 parent 38fe00c
mbtiles.c
// for vasprintf() on Linux
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sqlite3.h>
#include "pool.h"
#include "tile.h"
sqlite3 *mbtiles_open(char *dbname, char **argv) {
sqlite3 *outdb;
if (sqlite3_open(dbname, &outdb) != SQLITE_OK) {
fprintf(stderr, "%s: %s: %s\n", argv[0], dbname, sqlite3_errmsg(outdb));
exit(EXIT_FAILURE);
}
char *err = NULL;
if (sqlite3_exec(outdb, "PRAGMA synchronous=0", NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "%s: async: %s\n", argv[0], err);
exit(EXIT_FAILURE);
}
if (sqlite3_exec(outdb, "PRAGMA locking_mode=EXCLUSIVE", NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "%s: async: %s\n", argv[0], err);
exit(EXIT_FAILURE);
}
if (sqlite3_exec(outdb, "PRAGMA journal_mode=DELETE", NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "%s: async: %s\n", argv[0], err);
exit(EXIT_FAILURE);
}
if (sqlite3_exec(outdb, "CREATE TABLE metadata (name text, value text);", NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "%s: create metadata table: %s\n", argv[0], err);
exit(EXIT_FAILURE);
}
if (sqlite3_exec(outdb, "CREATE TABLE tiles (zoom_level integer, tile_column integer, tile_row integer, tile_data blob);", NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "%s: create tiles table: %s\n", argv[0], err);
exit(EXIT_FAILURE);
}
if (sqlite3_exec(outdb, "create unique index name on metadata (name);", NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "%s: index metadata: %s\n", argv[0], err);
exit(EXIT_FAILURE);
}
if (sqlite3_exec(outdb, "create unique index tile_index on tiles (zoom_level, tile_column, tile_row);", NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "%s: index tiles: %s\n", argv[0], err);
exit(EXIT_FAILURE);
}
return outdb;
}
void mbtiles_write_tile(sqlite3 *outdb, int z, int tx, int ty, const char *data, int size) {
sqlite3_stmt *stmt;
const char *query = "insert into tiles (zoom_level, tile_column, tile_row, tile_data) values (?, ?, ?, ?)";
if (sqlite3_prepare_v2(outdb, query, -1, &stmt, NULL) != SQLITE_OK) {
fprintf(stderr, "sqlite3 insert prep failed\n");
exit(EXIT_FAILURE);
}
sqlite3_bind_int(stmt, 1, z);
sqlite3_bind_int(stmt, 2, tx);
sqlite3_bind_int(stmt, 3, (1 << z) - 1 - ty);
sqlite3_bind_blob(stmt, 4, data, size, NULL);
if (sqlite3_step(stmt) != SQLITE_DONE) {
fprintf(stderr, "sqlite3 insert failed: %s\n", sqlite3_errmsg(outdb));
}
if (sqlite3_finalize(stmt) != SQLITE_OK) {
fprintf(stderr, "sqlite3 finalize failed: %s\n", sqlite3_errmsg(outdb));
}
}
static void quote(char **buf, const char *s) {
char tmp[strlen(s) * 8 + 1];
char *out = tmp;
for (; *s != '\0'; s++) {
unsigned char ch = (unsigned char) *s;
if (ch == '\\' || ch == '\"') {
*out++ = '\\';
*out++ = ch;
} else if (ch < ' ') {
sprintf(out, "\\u%04x", ch);
out = out + strlen(out);
} else {
*out++ = ch;
}
}
*out = '\0';
*buf = realloc(*buf, strlen(*buf) + strlen(tmp) + 1);
if (*buf == NULL) {
perror("realloc");
exit(EXIT_FAILURE);
}
strcat(*buf, tmp);
}
static void aprintf(char **buf, const char *format, ...) {
va_list ap;
char *tmp;
va_start(ap, format);
if (vasprintf(&tmp, format, ap) < 0) {
fprintf(stderr, "memory allocation failure\n");
exit(EXIT_FAILURE);
}
va_end(ap);
*buf = realloc(*buf, strlen(*buf) + strlen(tmp) + 1);
strcat(*buf, tmp);
free(tmp);
}
void mbtiles_write_metadata(sqlite3 *outdb, const char *fname, char **layername, int minzoom, int maxzoom, double minlat, double minlon, double maxlat, double maxlon, double midlat, double midlon, struct pool **file_keys, int nlayers) {
char *sql, *err;
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('name', %Q);", fname);
if (sqlite3_exec(outdb, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set name in metadata: %s\n", err);
exit(EXIT_FAILURE);
}
sqlite3_free(sql);
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('description', %Q);", fname);
if (sqlite3_exec(outdb, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set description in metadata: %s\n", err);
exit(EXIT_FAILURE);
}
sqlite3_free(sql);
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('version', %d);", 1);
if (sqlite3_exec(outdb, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set metadata: %s\n", err);
exit(EXIT_FAILURE);
}
sqlite3_free(sql);
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('minzoom', %d);", minzoom);
if (sqlite3_exec(outdb, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set metadata: %s\n", err);
exit(EXIT_FAILURE);
}
sqlite3_free(sql);
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('maxzoom', %d);", maxzoom);
if (sqlite3_exec(outdb, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set metadata: %s\n", err);
exit(EXIT_FAILURE);
}
sqlite3_free(sql);
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('center', '%f,%f,%d');", midlon, midlat, maxzoom);
if (sqlite3_exec(outdb, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set metadata: %s\n", err);
exit(EXIT_FAILURE);
}
sqlite3_free(sql);
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('bounds', '%f,%f,%f,%f');", minlon, minlat, maxlon, maxlat);
if (sqlite3_exec(outdb, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set metadata: %s\n", err);
exit(EXIT_FAILURE);
}
sqlite3_free(sql);
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('type', %Q);", "overlay");
if (sqlite3_exec(outdb, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set metadata: %s\n", err);
exit(EXIT_FAILURE);
}
sqlite3_free(sql);
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('format', %Q);", "pbf");
if (sqlite3_exec(outdb, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set metadata: %s\n", err);
exit(EXIT_FAILURE);
}
sqlite3_free(sql);
char *buf = strdup("{");
aprintf(&buf, "\"vector_layers\": [ ");
int i;
for (i = 0; i < nlayers; i++) {
if (i != 0) {
aprintf(&buf, ", ");
}
aprintf(&buf, "{ \"id\": \"");
quote(&buf, layername[i]);
aprintf(&buf, "\", \"description\": \"\", \"minzoom\": %d, \"maxzoom\": %d, \"fields\": {", minzoom, maxzoom);
struct pool_val *pv;
for (pv = file_keys[i]->head; pv != NULL; pv = pv->next) {
aprintf(&buf, "\"");
quote(&buf, pv->s);
if (pv->type == VT_NUMBER) {
aprintf(&buf, "\": \"Number\"");
} else if (pv->type == VT_BOOLEAN) {
aprintf(&buf, "\": \"Boolean\"");
} else {
aprintf(&buf, "\": \"String\"");
}
if (pv->next != NULL) {
aprintf(&buf, ", ");
}
}
aprintf(&buf, "} }");
}
aprintf(&buf, " ] }");
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('json', %Q);", buf);
if (sqlite3_exec(outdb, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set metadata: %s\n", err);
exit(EXIT_FAILURE);
}
sqlite3_free(sql);
free(buf);
}
void mbtiles_close(sqlite3 *outdb, char **argv) {
char *err;
if (sqlite3_exec(outdb, "ANALYZE;", NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "%s: ANALYZE failed: %s\n", argv[0], err);
exit(EXIT_FAILURE);
}
if (sqlite3_close(outdb) != SQLITE_OK) {
fprintf(stderr, "%s: could not close database: %s\n", argv[0], sqlite3_errmsg(outdb));
exit(EXIT_FAILURE);
}
}
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