253 lines
7.2 KiB
C++
253 lines
7.2 KiB
C++
/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include <sys/types.h>
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#include <cmath>
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#include "my_byteorder.h"
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#include "my_compiler.h"
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#include "my_dbug.h"
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#include "my_inttypes.h"
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#include "storage/myisam/myisamdef.h"
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#include "storage/myisam/sp_defs.h"
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static int sp_add_point_to_mbr(uchar *(*wkb), uchar *end, uint n_dims,
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uchar byte_order, double *mbr);
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static int sp_get_point_mbr(uchar *(*wkb), uchar *end, uint n_dims,
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uchar byte_order, double *mbr);
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static int sp_get_linestring_mbr(uchar *(*wkb), uchar *end, uint n_dims,
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uchar byte_order, double *mbr);
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static int sp_get_polygon_mbr(uchar *(*wkb), uchar *end, uint n_dims,
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uchar byte_order, double *mbr);
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static int sp_get_geometry_mbr(uchar *(*wkb), uchar *end, uint n_dims,
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double *mbr, int top);
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static int sp_mbr_from_wkb(uchar(*wkb), uint size, uint n_dims, double *mbr);
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uint sp_make_key(MI_INFO *info, uint keynr, uchar *key, const uchar *record,
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my_off_t filepos) {
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HA_KEYSEG *keyseg;
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MI_KEYDEF *keyinfo = &info->s->keyinfo[keynr];
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uint len = 0;
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const uchar *pos;
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uint dlen;
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uchar *dptr;
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double mbr[SPDIMS * 2];
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uint i;
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keyseg = &keyinfo->seg[-1];
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pos = record + keyseg->start;
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dlen = _mi_calc_blob_length(keyseg->bit_start, pos);
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memcpy(&dptr, pos + keyseg->bit_start, sizeof(char *));
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if (!dptr) {
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set_my_errno(HA_ERR_NULL_IN_SPATIAL);
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return 0;
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}
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sp_mbr_from_wkb(dptr + 4, dlen - 4, SPDIMS, mbr); /* SRID */
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for (i = 0, keyseg = keyinfo->seg; keyseg->type; keyseg++, i++) {
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uint length = keyseg->length, start = keyseg->start;
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double val;
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DBUG_ASSERT(length == sizeof(double));
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DBUG_ASSERT(!(start % sizeof(double)));
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DBUG_ASSERT(start < sizeof(mbr));
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DBUG_ASSERT(keyseg->type == HA_KEYTYPE_DOUBLE);
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val = mbr[start / sizeof(double)];
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if (std::isnan(val)) {
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memset(key, 0, length);
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key += length;
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len += length;
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continue;
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}
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if (keyseg->flag & HA_SWAP_KEY) {
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uchar buf[sizeof(double)];
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float8store(buf, val);
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pos = &buf[length];
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while (pos > buf) *key++ = *--pos;
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} else {
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float8store((uchar *)key, val);
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key += length;
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}
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len += length;
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}
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_mi_dpointer(info, key, filepos);
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return len;
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}
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/*
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Calculate minimal bounding rectangle (mbr) of the spatial object
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stored in "well-known binary representation" (wkb) format.
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*/
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static int sp_mbr_from_wkb(uchar *wkb, uint size, uint n_dims, double *mbr) {
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uint i;
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for (i = 0; i < n_dims; ++i) {
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mbr[i * 2] = DBL_MAX;
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mbr[i * 2 + 1] = -DBL_MAX;
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}
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return sp_get_geometry_mbr(&wkb, wkb + size, n_dims, mbr, 1);
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}
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/*
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Add one point stored in wkb to mbr
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*/
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static int sp_add_point_to_mbr(uchar *(*wkb), uchar *end, uint n_dims,
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uchar byte_order MY_ATTRIBUTE((unused)),
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double *mbr) {
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double ord;
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double *mbr_end = mbr + n_dims * 2;
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while (mbr < mbr_end) {
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if ((*wkb) > end - 8) return -1;
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float8get(&ord, (const uchar *)*wkb);
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(*wkb) += 8;
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if (ord < *mbr) *mbr = ord;
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mbr++;
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if (ord > *mbr) *mbr = ord;
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mbr++;
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}
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return 0;
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}
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static int sp_get_point_mbr(uchar *(*wkb), uchar *end, uint n_dims,
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uchar byte_order, double *mbr) {
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return sp_add_point_to_mbr(wkb, end, n_dims, byte_order, mbr);
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}
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static int sp_get_linestring_mbr(uchar *(*wkb), uchar *end, uint n_dims,
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uchar byte_order, double *mbr) {
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uint n_points;
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n_points = uint4korr(*wkb);
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(*wkb) += 4;
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for (; n_points > 0; --n_points) {
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/* Add next point to mbr */
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if (sp_add_point_to_mbr(wkb, end, n_dims, byte_order, mbr)) return -1;
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}
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return 0;
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}
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static int sp_get_polygon_mbr(uchar *(*wkb), uchar *end, uint n_dims,
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uchar byte_order, double *mbr) {
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uint n_linear_rings;
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uint n_points;
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n_linear_rings = uint4korr((*wkb));
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(*wkb) += 4;
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for (; n_linear_rings > 0; --n_linear_rings) {
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n_points = uint4korr((*wkb));
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(*wkb) += 4;
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for (; n_points > 0; --n_points) {
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/* Add next point to mbr */
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if (sp_add_point_to_mbr(wkb, end, n_dims, byte_order, mbr)) return -1;
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}
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}
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return 0;
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}
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static int sp_get_geometry_mbr(uchar *(*wkb), uchar *end, uint n_dims,
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double *mbr, int top) {
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int res;
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uchar byte_order;
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uint wkb_type;
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byte_order = *(*wkb);
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++(*wkb);
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wkb_type = uint4korr((*wkb));
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(*wkb) += 4;
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switch ((enum wkbType)wkb_type) {
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case wkbPoint:
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res = sp_get_point_mbr(wkb, end, n_dims, byte_order, mbr);
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break;
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case wkbLineString:
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res = sp_get_linestring_mbr(wkb, end, n_dims, byte_order, mbr);
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break;
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case wkbPolygon:
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res = sp_get_polygon_mbr(wkb, end, n_dims, byte_order, mbr);
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break;
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case wkbMultiPoint: {
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uint n_items;
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n_items = uint4korr((*wkb));
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(*wkb) += 4;
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for (; n_items > 0; --n_items) {
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byte_order = *(*wkb);
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++(*wkb);
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(*wkb) += 4;
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if (sp_get_point_mbr(wkb, end, n_dims, byte_order, mbr)) return -1;
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}
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res = 0;
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break;
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}
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case wkbMultiLineString: {
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uint n_items;
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n_items = uint4korr((*wkb));
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(*wkb) += 4;
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for (; n_items > 0; --n_items) {
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byte_order = *(*wkb);
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++(*wkb);
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(*wkb) += 4;
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if (sp_get_linestring_mbr(wkb, end, n_dims, byte_order, mbr)) return -1;
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}
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res = 0;
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break;
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}
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case wkbMultiPolygon: {
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uint n_items;
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n_items = uint4korr((*wkb));
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(*wkb) += 4;
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for (; n_items > 0; --n_items) {
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byte_order = *(*wkb);
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++(*wkb);
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(*wkb) += 4;
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if (sp_get_polygon_mbr(wkb, end, n_dims, byte_order, mbr)) return -1;
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}
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res = 0;
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break;
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}
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case wkbGeometryCollection: {
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uint n_items;
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if (!top) return -1;
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n_items = uint4korr((*wkb));
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(*wkb) += 4;
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for (; n_items > 0; --n_items) {
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if (sp_get_geometry_mbr(wkb, end, n_dims, mbr, 0)) return -1;
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}
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res = 0;
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break;
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}
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default:
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res = -1;
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}
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return res;
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}
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