mirror of
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286 lines
6.8 KiB
C
286 lines
6.8 KiB
C
/* Copyright (c) 2000, 2010, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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 "myisamdef.h"
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#ifdef HAVE_SPATIAL
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#include "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(register MI_INFO *info, uint keynr, uchar *key,
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const uchar *record, my_off_t filepos)
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{
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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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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 = (uchar*)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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{
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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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{
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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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#ifdef HAVE_ISNAN
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if (isnan(val))
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{
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bzero(key, 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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#endif
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if (keyseg->flag & HA_SWAP_KEY)
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{
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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)
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*key++ = *--pos;
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}
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else
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{
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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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{
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uint i;
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for (i=0; i < n_dims; ++i)
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{
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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 __attribute__((unused)),
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double *mbr)
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{
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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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{
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if ((*wkb) > end - 8)
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return -1;
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float8get(ord, (const uchar*) *wkb);
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(*wkb)+= 8;
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if (ord < *mbr)
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*mbr= ord;
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mbr++;
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if (ord > *mbr)
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*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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{
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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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{
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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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{
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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))
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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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{
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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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{
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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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{
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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))
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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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{
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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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{
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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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{
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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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{
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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))
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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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{
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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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{
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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))
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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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{
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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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{
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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))
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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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{
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uint n_items;
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if (!top)
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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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{
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if (sp_get_geometry_mbr(wkb, end, n_dims, mbr, 0))
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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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#endif /*HAVE_SPATIAL*/
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