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item_geofunc.cc
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/* Copyright (c) 2003, 2016, Oracle and/or its affiliates.
Copyright (c) 2011, 2016, MariaDB
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/**
@file
@brief
This file defines all spatial functions
*/
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
#include "mariadb.h"
#include "sql_priv.h"
/*
It is necessary to include set_var.h instead of item.h because there
are dependencies on include order for set_var.h and item.h. This
will be resolved later.
*/
#include "sql_class.h" // THD, set_var.h: THD
#include "set_var.h"
#ifdef HAVE_SPATIAL
#include <m_ctype.h>
#include "opt_range.h"
#include "item_geofunc.h"
#include "item_create.h"
bool Item_geometry_func::fix_length_and_dec()
{
collation.set(&my_charset_bin);
decimals=0;
max_length= (uint32) UINT_MAX32;
maybe_null= 1;
return FALSE;
}
String *Item_func_geometry_from_text::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
Geometry_buffer buffer;
String arg_val;
String *wkt= args[0]->val_str_ascii(&arg_val);
if ((null_value= args[0]->null_value))
return 0;
Gis_read_stream trs(wkt->charset(), wkt->ptr(), wkt->length());
uint32 srid= 0;
if ((arg_count == 2) && !args[1]->null_value)
srid= (uint32)args[1]->val_int();
str->set_charset(&my_charset_bin);
str->length(0);
if (str->reserve(SRID_SIZE, 512))
return 0;
str->q_append(srid);
if ((null_value= !Geometry::create_from_wkt(&buffer, &trs, str, 0)))
return 0;
return str;
}
String *Item_func_geometry_from_wkb::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
String arg_val;
String *wkb;
Geometry_buffer buffer;
uint32 srid= 0;
if (args[0]->field_type() == MYSQL_TYPE_GEOMETRY)
{
String *str_ret= args[0]->val_str(str);
null_value= args[0]->null_value;
return str_ret;
}
wkb= args[0]->val_str(&arg_val);
if ((arg_count == 2) && !args[1]->null_value)
srid= (uint32)args[1]->val_int();
str->set_charset(&my_charset_bin);
if (str->reserve(SRID_SIZE, 512))
{
null_value= TRUE; /* purecov: inspected */
return 0; /* purecov: inspected */
}
str->length(0);
str->q_append(srid);
if ((null_value=
(args[0]->null_value ||
!Geometry::create_from_wkb(&buffer, wkb->ptr(), wkb->length(), str))))
return 0;
return str;
}
void report_json_error_ex(String *js, json_engine_t *je,
const char *fname, int n_param,
Sql_condition::enum_warning_level lv);
String *Item_func_geometry_from_json::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
Geometry_buffer buffer;
String *js= args[0]->val_str_ascii(&tmp_js);
uint32 srid= 0;
longlong options= 0;
json_engine_t je;
if ((null_value= args[0]->null_value))
return 0;
if (arg_count > 1 && !args[1]->null_value)
{
options= args[1]->val_int();
if (options > 4 || options < 1)
{
String *sv= args[1]->val_str(&tmp_js);
my_error(ER_WRONG_VALUE_FOR_TYPE, MYF(0),
"option", sv->c_ptr_safe(), "ST_GeometryFromJSON");
null_value= 1;
return 0;
}
}
if ((arg_count == 3) && !args[2]->null_value)
srid= (uint32)args[2]->val_int();
str->set_charset(&my_charset_bin);
if (str->reserve(SRID_SIZE, 512))
return 0;
str->length(0);
str->q_append(srid);
json_scan_start(&je, js->charset(), (const uchar *) js->ptr(),
(const uchar *) js->end());
if ((null_value= !Geometry::create_from_json(&buffer, &je, options==1, str)))
{
int code= 0;
switch (je.s.error)
{
case Geometry::GEOJ_INCORRECT_GEOJSON:
code= ER_GEOJSON_INCORRECT;
break;
case Geometry::GEOJ_TOO_FEW_POINTS:
code= ER_GEOJSON_TOO_FEW_POINTS;
break;
case Geometry::GEOJ_EMPTY_COORDINATES:
code= ER_GEOJSON_EMPTY_COORDINATES;
break;
case Geometry::GEOJ_POLYGON_NOT_CLOSED:
code= ER_GEOJSON_NOT_CLOSED;
break;
case Geometry::GEOJ_DIMENSION_NOT_SUPPORTED:
my_error(ER_GIS_INVALID_DATA, MYF(0), "ST_GeometryFromJSON");
break;
default:
report_json_error_ex(js, &je, func_name(), 0, Sql_condition::WARN_LEVEL_WARN);
return NULL;
}
if (code)
{
THD *thd= current_thd;
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN, code,
ER_THD(thd, code));
}
return 0;
}
return str;
}
String *Item_func_as_wkt::val_str_ascii(String *str)
{
DBUG_ASSERT(fixed == 1);
String arg_val;
String *swkb= args[0]->val_str(&arg_val);
Geometry_buffer buffer;
Geometry *geom= NULL;
const char *dummy;
if ((null_value=
(args[0]->null_value ||
!(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
return 0;
str->length(0);
str->set_charset(&my_charset_latin1);
if ((null_value= geom->as_wkt(str, &dummy)))
return 0;
return str;
}
bool Item_func_as_wkt::fix_length_and_dec()
{
collation.set(default_charset(), DERIVATION_COERCIBLE, MY_REPERTOIRE_ASCII);
max_length= (uint32) UINT_MAX32;
maybe_null= 1;
return FALSE;
}
String *Item_func_as_wkb::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
String arg_val;
String *swkb= args[0]->val_str(&arg_val);
Geometry_buffer buffer;
if ((null_value=
(args[0]->null_value ||
!(Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
return 0;
str->copy(swkb->ptr() + SRID_SIZE, swkb->length() - SRID_SIZE,
&my_charset_bin);
return str;
}
bool Item_func_as_geojson::fix_length_and_dec()
{
collation.set(default_charset(), DERIVATION_COERCIBLE, MY_REPERTOIRE_ASCII);
max_length=MAX_BLOB_WIDTH;
maybe_null= 1;
return FALSE;
}
String *Item_func_as_geojson::val_str_ascii(String *str)
{
DBUG_ASSERT(fixed == 1);
String arg_val;
String *swkb= args[0]->val_str(&arg_val);
uint max_dec= FLOATING_POINT_DECIMALS;
longlong options= 0;
Geometry_buffer buffer;
Geometry *geom= NULL;
const char *dummy;
if ((null_value=
(args[0]->null_value ||
!(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
return 0;
if (arg_count > 1)
{
max_dec= (uint) args[1]->val_int();
if (args[1]->null_value)
max_dec= FLOATING_POINT_DECIMALS;
if (arg_count > 2)
{
options= args[2]->val_int();
if (args[2]->null_value)
options= 0;
}
}
str->length(0);
str->set_charset(&my_charset_latin1);
if (str->reserve(1, 512))
return 0;
str->qs_append('{');
if (options & 1)
{
if (geom->bbox_as_json(str) || str->append(", ", 2))
goto error;
}
if ((geom->as_json(str, max_dec, &dummy) || str->append("}", 1)))
goto error;
return str;
error:
null_value= 1;
return 0;
}
String *Item_func_geometry_type::val_str_ascii(String *str)
{
DBUG_ASSERT(fixed == 1);
String *swkb= args[0]->val_str(str);
Geometry_buffer buffer;
Geometry *geom= NULL;
if ((null_value=
(args[0]->null_value ||
!(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
return 0;
/* String will not move */
str->copy(geom->get_class_info()->m_name.str,
geom->get_class_info()->m_name.length,
&my_charset_latin1);
return str;
}
String *Item_func_envelope::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
String arg_val;
String *swkb= args[0]->val_str(&arg_val);
Geometry_buffer buffer;
Geometry *geom= NULL;
uint32 srid;
if ((null_value=
args[0]->null_value ||
!(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length()))))
return 0;
srid= uint4korr(swkb->ptr());
str->set_charset(&my_charset_bin);
str->length(0);
if (str->reserve(SRID_SIZE, 512))
return 0;
str->q_append(srid);
return (null_value= geom->envelope(str)) ? 0 : str;
}
int Item_func_boundary::Transporter::single_point(double x, double y)
{
return 0;
}
int Item_func_boundary::Transporter::start_line()
{
n_points= 0;
current_type= Gcalc_function::shape_line;
return 0;
}
int Item_func_boundary::Transporter::complete_line()
{
current_type= (Gcalc_function::shape_type) 0;
if (n_points > 1)
return m_receiver->single_point(last_x, last_y);
return 0;
}
int Item_func_boundary::Transporter::start_poly()
{
current_type= Gcalc_function::shape_polygon;
return 0;
}
int Item_func_boundary::Transporter::complete_poly()
{
current_type= (Gcalc_function::shape_type) 0;
return 0;
}
int Item_func_boundary::Transporter::start_ring()
{
n_points= 0;
return m_receiver->start_shape(Gcalc_function::shape_line);
}
int Item_func_boundary::Transporter::complete_ring()
{
if (n_points > 1)
{
m_receiver->add_point(last_x, last_y);
}
m_receiver->complete_shape();
return 0;
}
int Item_func_boundary::Transporter::add_point(double x, double y)
{
++n_points;
if (current_type== Gcalc_function::shape_polygon)
{
/* Polygon's ring case */
if (n_points == 1)
{
last_x= x;
last_y= y;
}
return m_receiver->add_point(x, y);
}
if (current_type== Gcalc_function::shape_line)
{
/* Line's case */
last_x= x;
last_y= y;
if (n_points == 1)
return m_receiver->single_point(x, y);
}
return 0;
}
int Item_func_boundary::Transporter::start_collection(int n_objects)
{
return 0;
}
String *Item_func_boundary::val_str(String *str_value)
{
DBUG_ENTER("Item_func_boundary::val_str");
DBUG_ASSERT(fixed == 1);
String arg_val;
String *swkb= args[0]->val_str(&arg_val);
Geometry_buffer buffer;
Geometry *g;
uint32 srid= 0;
Transporter trn(&res_receiver);
if ((null_value=
args[0]->null_value ||
!(g= Geometry::construct(&buffer, swkb->ptr(), swkb->length()))))
DBUG_RETURN(0);
if (g->store_shapes(&trn))
goto mem_error;
str_value->set_charset(&my_charset_bin);
if (str_value->reserve(SRID_SIZE, 512))
goto mem_error;
str_value->length(0);
str_value->q_append(srid);
if (!Geometry::create_from_opresult(&buffer, str_value, res_receiver))
goto mem_error;
res_receiver.reset();
DBUG_RETURN(str_value);
mem_error:
null_value= 1;
DBUG_RETURN(0);
}
String *Item_func_centroid::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
String arg_val;
String *swkb= args[0]->val_str(&arg_val);
Geometry_buffer buffer;
Geometry *geom= NULL;
uint32 srid;
if ((null_value= args[0]->null_value ||
!(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length()))))
return 0;
str->set_charset(&my_charset_bin);
if (str->reserve(SRID_SIZE, 512))
return 0;
str->length(0);
srid= uint4korr(swkb->ptr());
str->q_append(srid);
return (null_value= MY_TEST(geom->centroid(str))) ? 0 : str;
}
int Item_func_convexhull::add_node_to_line(ch_node **p_cur, int dir,
const Gcalc_heap::Info *pi)
{
ch_node *new_node;
ch_node *cur= *p_cur;
while (cur->prev)
{
int v_sign= Gcalc_scan_iterator::point::cmp_dx_dy(
cur->prev->pi, cur->pi, cur->pi, pi);
if (v_sign*dir <0)
break;
new_node= cur;
cur= cur->prev;
res_heap.free_item(new_node);
}
if (!(new_node= new_ch_node()))
return 1;
cur->next= new_node;
new_node->prev= cur;
new_node->pi= pi;
*p_cur= new_node;
return 0;
}
#ifndef HEAVY_CONVEX_HULL
String *Item_func_convexhull::val_str(String *str_value)
{
Geometry_buffer buffer;
Geometry *geom= NULL;
MBR mbr;
const char *c_end;
Gcalc_operation_transporter trn(&func, &collector);
uint32 srid= 0;
ch_node *left_first, *left_cur, *right_first, *right_cur;
Gcalc_heap::Info *cur_pi;
DBUG_ENTER("Item_func_convexhull::val_str");
DBUG_ASSERT(fixed == 1);
String *swkb= args[0]->val_str(&tmp_value);
if ((null_value=
args[0]->null_value ||
!(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length()))))
DBUG_RETURN(0);
geom->get_mbr(&mbr, &c_end);
collector.set_extent(mbr.xmin, mbr.xmax, mbr.ymin, mbr.ymax);
if ((null_value= geom->store_shapes(&trn)))
{
str_value= 0;
goto mem_error;
}
collector.prepare_operation();
if (!(cur_pi= collector.get_first()))
goto build_result; /* An EMPTY GEOMETRY */
if (!cur_pi->get_next())
{
/* Single point. */
if (res_receiver.single_point(cur_pi->node.shape.x, cur_pi->node.shape.y))
goto mem_error;
goto build_result;
}
left_cur= left_first= new_ch_node();
right_cur= right_first= new_ch_node();
right_first->prev= left_first->prev= 0;
right_first->pi= left_first->pi= cur_pi;
while ((cur_pi= cur_pi->get_next()))
{
/* Handle left part of the hull, then the right part. */
if (add_node_to_line(&left_cur, 1, cur_pi))
goto mem_error;
if (add_node_to_line(&right_cur, -1, cur_pi))
goto mem_error;
}
left_cur->next= 0;
if (left_first->get_next()->get_next() == NULL &&
right_cur->prev->prev == NULL)
{
/* We only have 2 nodes in the result, so we create a polyline. */
if (res_receiver.start_shape(Gcalc_function::shape_line) ||
res_receiver.add_point(left_first->pi->node.shape.x, left_first->pi->node.shape.y) ||
res_receiver.add_point(left_cur->pi->node.shape.x, left_cur->pi->node.shape.y) ||
res_receiver.complete_shape())
goto mem_error;
goto build_result;
}
if (res_receiver.start_shape(Gcalc_function::shape_polygon))
goto mem_error;
while (left_first)
{
if (res_receiver.add_point(left_first->pi->node.shape.x, left_first->pi->node.shape.y))
goto mem_error;
left_first= left_first->get_next();
}
/* Skip last point in the right part as it coincides */
/* with the last one in the left. */
right_cur= right_cur->prev;
while (right_cur->prev)
{
if (res_receiver.add_point(right_cur->pi->node.shape.x, right_cur->pi->node.shape.y))
goto mem_error;
right_cur= right_cur->prev;
}
res_receiver.complete_shape();
build_result:
str_value->set_charset(&my_charset_bin);
if (str_value->reserve(SRID_SIZE, 512))
goto mem_error;
str_value->length(0);
str_value->q_append(srid);
if (!Geometry::create_from_opresult(&buffer, str_value, res_receiver))
goto mem_error;
mem_error:
collector.reset();
func.reset();
res_receiver.reset();
res_heap.reset();
DBUG_RETURN(str_value);
}
#else /*HEAVY_CONVEX_HULL*/
String *Item_func_convexhull::val_str(String *str_value)
{
Geometry_buffer buffer;
Geometry *geom= NULL;
MBR mbr;
const char *c_end;
Gcalc_operation_transporter trn(&func, &collector);
const Gcalc_scan_iterator::event_point *ev;
uint32 srid= 0;
ch_node *left_first, *left_cur, *right_first, *right_cur;
DBUG_ENTER("Item_func_convexhull::val_str");
DBUG_ASSERT(fixed == 1);
String *swkb= args[0]->val_str(&tmp_value);
if ((null_value=
args[0]->null_value ||
!(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length()))))
DBUG_RETURN(0);
geom->get_mbr(&mbr, &c_end);
collector.set_extent(mbr.xmin, mbr.xmax, mbr.ymin, mbr.ymax);
if ((null_value= geom->store_shapes(&trn)))
{
str_value= 0;
goto mem_error;
}
collector.prepare_operation();
scan_it.init(&collector);
scan_it.killed= (int *) &(current_thd->killed);
if (!scan_it.more_points())
goto build_result; /* An EMPTY GEOMETRY */
if (scan_it.step())
goto mem_error;
if (!scan_it.more_points())
{
/* Single point. */
if (res_receiver.single_point(scan_it.get_events()->pi->x,
scan_it.get_events()->pi->y))
goto mem_error;
goto build_result;
}
left_cur= left_first= new_ch_node();
right_cur= right_first= new_ch_node();
right_first->prev= left_first->prev= 0;
right_first->pi= left_first->pi= scan_it.get_events()->pi;
while (scan_it.more_points())
{
if (scan_it.step())
goto mem_error;
ev= scan_it.get_events();
/* Skip the intersections-only events. */
while (ev->event == scev_intersection)
{
ev= ev->get_next();
if (!ev)
goto skip_point;
}
{
Gcalc_point_iterator pit(&scan_it);
if (!pit.point() || scan_it.get_event_position() == pit.point())
{
/* Handle left part of the hull. */
if (add_node_to_line(&left_cur, 1, ev->pi))
goto mem_error;
}
if (pit.point())
{
/* Check the rightmost point */
for(; pit.point()->c_get_next(); ++pit)
;
}
if (!pit.point() || pit.point()->event ||
scan_it.get_event_position() == pit.point()->c_get_next())
{
/* Handle right part of the hull. */
if (add_node_to_line(&right_cur, -1, ev->pi))
goto mem_error;
}
}
skip_point:;
}
left_cur->next= 0;
if (left_first->get_next()->get_next() == NULL &&
right_cur->prev->prev == NULL)
{
/* We only have 2 nodes in the result, so we create a polyline. */
if (res_receiver.start_shape(Gcalc_function::shape_line) ||
res_receiver.add_point(left_first->pi->x, left_first->pi->y) ||
res_receiver.add_point(left_cur->pi->x, left_cur->pi->y) ||
res_receiver.complete_shape())
goto mem_error;
goto build_result;
}
if (res_receiver.start_shape(Gcalc_function::shape_polygon))
goto mem_error;
while (left_first)
{
if (res_receiver.add_point(left_first->pi->x, left_first->pi->y))
goto mem_error;
left_first= left_first->get_next();
}
/* Skip last point in the right part as it coincides */
/* with the last one in the left. */
right_cur= right_cur->prev;
while (right_cur->prev)
{
if (res_receiver.add_point(right_cur->pi->x, right_cur->pi->y))
goto mem_error;
right_cur= right_cur->prev;
}
res_receiver.complete_shape();
build_result:
str_value->set_charset(&my_charset_bin);
if (str_value->reserve(SRID_SIZE, 512))
goto mem_error;
str_value->length(0);
str_value->q_append(srid);
if (!Geometry::create_from_opresult(&buffer, str_value, res_receiver))
goto mem_error;
mem_error:
collector.reset();
func.reset();
res_receiver.reset();
res_heap.reset();
DBUG_RETURN(str_value);
}
#endif /*HEAVY_CONVEX_HULL*/
/*
Spatial decomposition functions
*/
String *Item_func_spatial_decomp::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
String arg_val;
String *swkb= args[0]->val_str(&arg_val);
Geometry_buffer buffer;
Geometry *geom= NULL;
uint32 srid;
if ((null_value=
(args[0]->null_value ||
!(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
return 0;
srid= uint4korr(swkb->ptr());
str->set_charset(&my_charset_bin);
if (str->reserve(SRID_SIZE, 512))
goto err;
str->length(0);
str->q_append(srid);
switch (decomp_func) {
case SP_STARTPOINT:
if (geom->start_point(str))
goto err;
break;
case SP_ENDPOINT:
if (geom->end_point(str))
goto err;
break;
case SP_EXTERIORRING:
if (geom->exterior_ring(str))
goto err;
break;
default:
goto err;
}
return str;
err:
null_value= 1;
return 0;
}
String *Item_func_spatial_decomp_n::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
String arg_val;
String *swkb= args[0]->val_str(&arg_val);
long n= (long) args[1]->val_int();
Geometry_buffer buffer;
Geometry *geom= NULL;
uint32 srid;
if ((null_value=
(args[0]->null_value || args[1]->null_value ||
!(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
return 0;
str->set_charset(&my_charset_bin);
if (str->reserve(SRID_SIZE, 512))
goto err;
srid= uint4korr(swkb->ptr());
str->length(0);
str->q_append(srid);
switch (decomp_func_n)
{
case SP_POINTN:
if (geom->point_n(n,str))
goto err;
break;
case SP_GEOMETRYN:
if (geom->geometry_n(n,str))
goto err;
break;
case SP_INTERIORRINGN:
if (geom->interior_ring_n(n,str))
goto err;
break;
default:
goto err;
}
return str;
err:
null_value=1;
return 0;
}
/*
Functions to concatenate various spatial objects
*/
/*
* Concatenate doubles into Point
*/
String *Item_func_point::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
double x= args[0]->val_real();
double y= args[1]->val_real();
uint32 srid= 0;
if ((null_value= (args[0]->null_value ||
args[1]->null_value ||
str->alloc(4/*SRID*/ + 1 + 4 + SIZEOF_STORED_DOUBLE * 2))))
return 0;
str->set_charset(&my_charset_bin);
str->length(0);
str->q_append(srid);
str->q_append((char)Geometry::wkb_ndr);
str->q_append((uint32)Geometry::wkb_point);
str->q_append(x);
str->q_append(y);
return str;
}
/**
Concatenates various items into various collections
with checkings for valid wkb type of items.
For example, MultiPoint can be a collection of Points only.
coll_type contains wkb type of target collection.
item_type contains a valid wkb type of items.
In the case when coll_type is wkbGeometryCollection,
we do not check wkb type of items, any is valid.
*/
String *Item_func_spatial_collection::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
String arg_value;
uint i;
uint32 srid= 0;
str->set_charset(&my_charset_bin);
str->length(0);
if (str->reserve(4/*SRID*/ + 1 + 4 + 4, 512))
goto err;
str->q_append(srid);
str->q_append((char) Geometry::wkb_ndr);
str->q_append((uint32) coll_type);
str->q_append((uint32) arg_count);
for (i= 0; i < arg_count; ++i)
{
String *res= args[i]->val_str(&arg_value);
uint32 len;
if (args[i]->null_value || ((len= res->length()) < WKB_HEADER_SIZE))
goto err;
if (coll_type == Geometry::wkb_geometrycollection)
{
/*
In the case of GeometryCollection we don't need any checkings
for item types, so just copy them into target collection
*/
if (str->append(res->ptr() + 4/*SRID*/, len - 4/*SRID*/, (uint32) 512))
goto err;
}
else
{
enum Geometry::wkbType wkb_type;
const uint data_offset= 4/*SRID*/ + 1;
if (res->length() < data_offset + sizeof(uint32))
goto err;
const char *data= res->ptr() + data_offset;
/*
In the case of named collection we must check that items
are of specific type, let's do this checking now
*/
wkb_type= (Geometry::wkbType) uint4korr(data);
data+= 4;
len-= 5 + 4/*SRID*/;
if (wkb_type != item_type)
goto err;
switch (coll_type) {
case Geometry::wkb_multipoint:
case Geometry::wkb_multilinestring:
case Geometry::wkb_multipolygon:
if (len < WKB_HEADER_SIZE ||
str->append(data-WKB_HEADER_SIZE, len+WKB_HEADER_SIZE, 512))
goto err;
break;
case Geometry::wkb_linestring:
if (len < POINT_DATA_SIZE || str->append(data, POINT_DATA_SIZE, 512))
goto err;
break;
case Geometry::wkb_polygon:
{
uint32 n_points;
double x1, y1, x2, y2;
const char *org_data= data;
if (len < 4)
goto err;