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/* Copyright (C) 2000 MySQL AB & Ramil Kalimullin
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "myisamdef.h"
#ifdef HAVE_SPATIAL
#include "sp_defs.h"
static int sp_add_point_to_mbr(uchar *(*wkb), uchar *end, uint n_dims,
uchar byte_order, double *mbr);
static int sp_get_point_mbr(uchar *(*wkb), uchar *end, uint n_dims,
uchar byte_order, double *mbr);
static int sp_get_linestring_mbr(uchar *(*wkb), uchar *end, uint n_dims,
uchar byte_order, double *mbr);
static int sp_get_polygon_mbr(uchar *(*wkb), uchar *end, uint n_dims,
uchar byte_order, double *mbr);
static int sp_get_geometry_mbr(uchar *(*wkb), uchar *end, uint n_dims,
double *mbr, int top);
static int sp_mbr_from_wkb(uchar (*wkb), uint size, uint n_dims, double *mbr);
static void get_double(double *d, const byte *pos)
{
float8get(*d, pos);
}
uint sp_make_key(register MI_INFO *info, uint keynr, uchar *key,
const byte *record, my_off_t filepos)
{
HA_KEYSEG *keyseg;
MI_KEYDEF *keyinfo = &info->s->keyinfo[keynr];
uint len = 0;
byte *pos;
uint dlen;
uchar *dptr;
double mbr[SPDIMS * 2];
uint i;
keyseg = &keyinfo->seg[-1];
pos = (byte*)record + keyseg->start;
dlen = _mi_calc_blob_length(keyseg->bit_start, pos);
memcpy_fixed(&dptr, pos + keyseg->bit_start, sizeof(char*));
if (!dptr)
{
my_errno= HA_ERR_NULL_IN_SPATIAL;
return 0;
}
sp_mbr_from_wkb(dptr + 4, dlen - 4, SPDIMS, mbr); /* SRID */
for (i = 0, keyseg = keyinfo->seg; keyseg->type; keyseg++, i++)
{
uint length = keyseg->length;
pos = ((byte*)mbr) + keyseg->start;
if (keyseg->flag & HA_SWAP_KEY)
{
#ifdef HAVE_ISNAN
if (keyseg->type == HA_KEYTYPE_FLOAT)
{
float nr;
float4get(nr, pos);
if (isnan(nr))
{
/* Replace NAN with zero */
bzero(key, length);
key+= length;
continue;
}
}
else if (keyseg->type == HA_KEYTYPE_DOUBLE)
{
double nr;
get_double(&nr, pos);
if (isnan(nr))
{
bzero(key, length);
key+= length;
continue;
}
}
#endif
pos += length;
while (length--)
{
*key++ = *--pos;
}
}
else
{
memcpy((byte*)key, pos, length);
key += keyseg->length;
}
len += keyseg->length;
}
_mi_dpointer(info, key, filepos);
return len;
}
/*
Calculate minimal bounding rectangle (mbr) of the spatial object
stored in "well-known binary representation" (wkb) format.
*/
static int sp_mbr_from_wkb(uchar *wkb, uint size, uint n_dims, double *mbr)
{
uint i;
for (i=0; i < n_dims; ++i)
{
mbr[i * 2] = DBL_MAX;
mbr[i * 2 + 1] = -DBL_MAX;
}
return sp_get_geometry_mbr(&wkb, wkb + size, n_dims, mbr, 1);
}
/*
Add one point stored in wkb to mbr
*/
static int sp_add_point_to_mbr(uchar *(*wkb), uchar *end, uint n_dims,
uchar byte_order __attribute__((unused)),
double *mbr)
{
double ord;
double *mbr_end= mbr + n_dims * 2;
while (mbr < mbr_end)
{
if ((*wkb) > end - 8)
return -1;
get_double(&ord, (const byte*) *wkb);
(*wkb)+= 8;
if (ord < *mbr)
float8store((char*) mbr, ord);
mbr++;
if (ord > *mbr)
float8store((char*) mbr, ord);
mbr++;
}
return 0;
}
static int sp_get_point_mbr(uchar *(*wkb), uchar *end, uint n_dims,
uchar byte_order, double *mbr)
{
return sp_add_point_to_mbr(wkb, end, n_dims, byte_order, mbr);
}
static int sp_get_linestring_mbr(uchar *(*wkb), uchar *end, uint n_dims,
uchar byte_order, double *mbr)
{
uint n_points;
n_points = uint4korr(*wkb);
(*wkb) += 4;
for (; n_points > 0; --n_points)
{
/* Add next point to mbr */
if (sp_add_point_to_mbr(wkb, end, n_dims, byte_order, mbr))
return -1;
}
return 0;
}
static int sp_get_polygon_mbr(uchar *(*wkb), uchar *end, uint n_dims,
uchar byte_order, double *mbr)
{
uint n_linear_rings;
uint n_points;
n_linear_rings = uint4korr((*wkb));
(*wkb) += 4;
for (; n_linear_rings > 0; --n_linear_rings)
{
n_points = uint4korr((*wkb));
(*wkb) += 4;
for (; n_points > 0; --n_points)
{
/* Add next point to mbr */
if (sp_add_point_to_mbr(wkb, end, n_dims, byte_order, mbr))
return -1;
}
}
return 0;
}
static int sp_get_geometry_mbr(uchar *(*wkb), uchar *end, uint n_dims,
double *mbr, int top)
{
int res;
uchar byte_order;
uint wkb_type;
byte_order = *(*wkb);
++(*wkb);
wkb_type = uint4korr((*wkb));
(*wkb) += 4;
switch ((enum wkbType) wkb_type)
{
case wkbPoint:
res = sp_get_point_mbr(wkb, end, n_dims, byte_order, mbr);
break;
case wkbLineString:
res = sp_get_linestring_mbr(wkb, end, n_dims, byte_order, mbr);
break;
case wkbPolygon:
res = sp_get_polygon_mbr(wkb, end, n_dims, byte_order, mbr);
break;
case wkbMultiPoint:
{
uint n_items;
n_items = uint4korr((*wkb));
(*wkb) += 4;
for (; n_items > 0; --n_items)
{
byte_order = *(*wkb);
++(*wkb);
(*wkb) += 4;
if (sp_get_point_mbr(wkb, end, n_dims, byte_order, mbr))
return -1;
}
res = 0;
break;
}
case wkbMultiLineString:
{
uint n_items;
n_items = uint4korr((*wkb));
(*wkb) += 4;
for (; n_items > 0; --n_items)
{
byte_order = *(*wkb);
++(*wkb);
(*wkb) += 4;
if (sp_get_linestring_mbr(wkb, end, n_dims, byte_order, mbr))
return -1;
}
res = 0;
break;
}
case wkbMultiPolygon:
{
uint n_items;
n_items = uint4korr((*wkb));
(*wkb) += 4;
for (; n_items > 0; --n_items)
{
byte_order = *(*wkb);
++(*wkb);
(*wkb) += 4;
if (sp_get_polygon_mbr(wkb, end, n_dims, byte_order, mbr))
return -1;
}
res = 0;
break;
}
case wkbGeometryCollection:
{
uint n_items;
if (!top)
return -1;
n_items = uint4korr((*wkb));
(*wkb) += 4;
for (; n_items > 0; --n_items)
{
if (sp_get_geometry_mbr(wkb, end, n_dims, mbr, 0))
return -1;
}
res = 0;
break;
}
default:
res = -1;
}
return res;
}
#endif /*HAVE_SPATIAL*/
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