466 lines
13 KiB
C++
466 lines
13 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2011 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/global.hpp>
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#include <mapnik/wkb.hpp>
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#include <mapnik/coord_array.hpp>
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#include <mapnik/geom_util.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/noncopyable.hpp>
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// boost
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#include <boost/format.hpp>
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namespace mapnik
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{
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typedef coord_array<coord2d> CoordinateArray;
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struct wkb_reader : mapnik::noncopyable
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{
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private:
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enum wkbByteOrder {
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wkbXDR=0,
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wkbNDR=1
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};
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const char* wkb_;
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unsigned size_;
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unsigned pos_;
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wkbByteOrder byteOrder_;
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bool needSwap_;
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wkbFormat format_;
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public:
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enum wkbGeometryType {
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wkbPoint=1,
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wkbLineString=2,
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wkbPolygon=3,
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wkbMultiPoint=4,
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wkbMultiLineString=5,
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wkbMultiPolygon=6,
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wkbGeometryCollection=7,
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wkbPointZ=1001,
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wkbLineStringZ=1002,
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wkbPolygonZ=1003,
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wkbMultiPointZ=1004,
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wkbMultiLineStringZ=1005,
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wkbMultiPolygonZ=1006,
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wkbGeometryCollectionZ=1007
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};
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wkb_reader(const char* wkb, unsigned size, wkbFormat format)
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: wkb_(wkb),
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size_(size),
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pos_(0),
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format_(format)
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{
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// try to determine WKB format automatically
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if (format_ == wkbAuto)
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{
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if (size_ >= 44
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&& (unsigned char)(wkb_[0]) == (unsigned char)(0x00)
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&& (unsigned char)(wkb_[38]) == (unsigned char)(0x7C)
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&& (unsigned char)(wkb_[size_ - 1]) == (unsigned char)(0xFE))
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{
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format_ = wkbSpatiaLite;
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}
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else
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{
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format_ = wkbGeneric;
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}
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}
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switch (format_)
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{
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case wkbSpatiaLite:
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byteOrder_ = (wkbByteOrder) wkb_[1];
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pos_ = 39;
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break;
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case wkbGeneric:
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default:
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byteOrder_ = (wkbByteOrder) wkb_[0];
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pos_ = 1;
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break;
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}
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#ifndef MAPNIK_BIG_ENDIAN
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needSwap_ = byteOrder_ ? wkbXDR : wkbNDR;
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#else
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needSwap_ = byteOrder_ ? wkbNDR : wkbXDR;
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#endif
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}
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void read(boost::ptr_vector<geometry_type> & paths)
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{
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int type = read_integer();
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switch (type)
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{
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case wkbPoint:
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read_point(paths);
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break;
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case wkbLineString:
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read_linestring(paths);
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break;
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case wkbPolygon:
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read_polygon(paths);
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break;
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case wkbMultiPoint:
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read_multipoint(paths);
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break;
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case wkbMultiLineString:
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read_multilinestring(paths);
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break;
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case wkbMultiPolygon:
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read_multipolygon(paths);
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break;
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case wkbGeometryCollection:
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read_collection(paths);
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break;
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case wkbPointZ:
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read_point_xyz(paths);
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break;
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case wkbLineStringZ:
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read_linestring_xyz(paths);
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break;
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case wkbPolygonZ:
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read_polygon_xyz(paths);
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break;
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case wkbMultiPointZ:
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read_multipoint_xyz(paths);
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break;
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case wkbMultiLineStringZ:
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read_multilinestring_xyz(paths);
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break;
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case wkbMultiPolygonZ:
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read_multipolygon_xyz(paths);
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break;
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case wkbGeometryCollectionZ:
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read_collection(paths);
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break;
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default:
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break;
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}
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}
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private:
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int read_integer()
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{
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boost::int32_t n;
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if (needSwap_)
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{
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read_int32_xdr(wkb_ + pos_, n);
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}
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else
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{
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read_int32_ndr(wkb_ + pos_, n);
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}
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pos_ += 4;
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return n;
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}
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double read_double()
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{
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double d;
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if (needSwap_)
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{
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read_double_xdr(wkb_ + pos_, d);
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}
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else
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{
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read_double_ndr(wkb_ + pos_, d);
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}
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pos_ += 8;
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return d;
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}
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void read_coords(CoordinateArray& ar)
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{
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if (! needSwap_)
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{
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for (unsigned i = 0; i < ar.size(); ++i)
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{
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read_double_ndr(wkb_ + pos_, ar[i].x);
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read_double_ndr(wkb_ + pos_ + 8, ar[i].y);
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pos_ += 16; // skip XY
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}
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}
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else
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{
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for (unsigned i=0;i<ar.size();++i)
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{
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read_double_xdr(wkb_ + pos_, ar[i].x);
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read_double_xdr(wkb_ + pos_ + 8, ar[i].y);
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pos_ += 16; // skip XY
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}
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}
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}
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void read_coords_xyz(CoordinateArray& ar)
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{
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if (! needSwap_)
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{
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for (unsigned i = 0; i < ar.size(); ++i)
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{
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read_double_ndr(wkb_ + pos_, ar[i].x);
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read_double_ndr(wkb_ + pos_ + 8, ar[i].y);
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pos_ += 24; // skip XYZ
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}
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}
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else
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{
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for (unsigned i = 0; i < ar.size(); ++i)
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{
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read_double_xdr(wkb_ + pos_, ar[i].x);
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read_double_xdr(wkb_ + pos_ + 8, ar[i].y);
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pos_ += 24; // skip XYZ
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}
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}
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}
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void read_point(boost::ptr_vector<geometry_type> & paths)
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{
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double x = read_double();
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double y = read_double();
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std::auto_ptr<geometry_type> pt(new geometry_type(Point));
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pt->move_to(x, y);
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paths.push_back(pt);
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}
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void read_multipoint(boost::ptr_vector<geometry_type> & paths)
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{
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int num_points = read_integer();
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for (int i = 0; i < num_points; ++i)
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{
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pos_ += 5;
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read_point(paths);
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}
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}
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void read_point_xyz(boost::ptr_vector<geometry_type> & paths)
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{
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double x = read_double();
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double y = read_double();
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std::auto_ptr<geometry_type> pt(new geometry_type(Point));
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pos_ += 8; // double z = read_double();
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pt->move_to(x, y);
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paths.push_back(pt);
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}
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void read_multipoint_xyz(boost::ptr_vector<geometry_type> & paths)
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{
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int num_points = read_integer();
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for (int i = 0; i < num_points; ++i)
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{
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pos_ += 5;
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read_point_xyz(paths);
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}
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}
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void read_linestring(boost::ptr_vector<geometry_type> & paths)
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{
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int num_points = read_integer();
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if (num_points > 0)
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{
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CoordinateArray ar(num_points);
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read_coords(ar);
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std::auto_ptr<geometry_type> line(new geometry_type(LineString));
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line->move_to(ar[0].x, ar[0].y);
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for (int i = 1; i < num_points; ++i)
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{
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line->line_to(ar[i].x, ar[i].y);
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}
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paths.push_back(line);
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}
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}
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void read_multilinestring(boost::ptr_vector<geometry_type> & paths)
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{
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int num_lines = read_integer();
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for (int i = 0; i < num_lines; ++i)
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{
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pos_ += 5;
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read_linestring(paths);
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}
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}
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void read_linestring_xyz(boost::ptr_vector<geometry_type> & paths)
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{
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int num_points = read_integer();
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if (num_points > 0)
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{
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CoordinateArray ar(num_points);
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read_coords_xyz(ar);
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std::auto_ptr<geometry_type> line(new geometry_type(LineString));
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line->move_to(ar[0].x, ar[0].y);
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for (int i = 1; i < num_points; ++i)
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{
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line->line_to(ar[i].x, ar[i].y);
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}
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paths.push_back(line);
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}
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}
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void read_multilinestring_xyz(boost::ptr_vector<geometry_type> & paths)
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{
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int num_lines = read_integer();
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for (int i = 0; i < num_lines; ++i)
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{
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pos_ += 5;
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read_linestring_xyz(paths);
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}
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}
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void read_polygon(boost::ptr_vector<geometry_type> & paths)
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{
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int num_rings = read_integer();
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if (num_rings > 0)
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{
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std::auto_ptr<geometry_type> poly(new geometry_type(Polygon));
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for (int i = 0; i < num_rings; ++i)
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{
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int num_points = read_integer();
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if (num_points > 0)
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{
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CoordinateArray ar(num_points);
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read_coords(ar);
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poly->move_to(ar[0].x, ar[0].y);
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for (int j = 1; j < num_points ; ++j)
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{
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poly->line_to(ar[j].x, ar[j].y);
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}
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poly->close_path();
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}
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}
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if (poly->size() > 3) // ignore if polygon has less than (3 + close_path) vertices
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paths.push_back(poly);
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}
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}
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void read_multipolygon(boost::ptr_vector<geometry_type> & paths)
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{
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int num_polys = read_integer();
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for (int i = 0; i < num_polys; ++i)
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{
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pos_ += 5;
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read_polygon(paths);
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}
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}
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void read_polygon_xyz(boost::ptr_vector<geometry_type> & paths)
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{
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int num_rings = read_integer();
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if (num_rings > 0)
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{
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std::auto_ptr<geometry_type> poly(new geometry_type(Polygon));
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for (int i = 0; i < num_rings; ++i)
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{
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int num_points = read_integer();
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if (num_points > 0)
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{
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CoordinateArray ar(num_points);
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read_coords_xyz(ar);
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poly->move_to(ar[0].x, ar[0].y);
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for (int j = 1; j < num_points; ++j)
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{
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poly->line_to(ar[j].x, ar[j].y);
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}
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poly->close_path();
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}
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}
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if (poly->size() > 2) // ignore if polygon has less than 3 vertices
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paths.push_back(poly);
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}
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}
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void read_multipolygon_xyz(boost::ptr_vector<geometry_type> & paths)
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{
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int num_polys = read_integer();
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for (int i = 0; i < num_polys; ++i)
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{
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pos_ += 5;
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read_polygon_xyz(paths);
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}
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}
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void read_collection(boost::ptr_vector<geometry_type> & paths)
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{
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int num_geometries = read_integer();
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for (int i = 0; i < num_geometries; ++i)
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{
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pos_ += 1; // skip byte order
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read(paths);
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}
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}
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std::string wkb_geometry_type_string(int type)
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{
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std::stringstream s;
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switch (type)
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{
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case wkbPoint: s << "Point"; break;
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case wkbLineString: s << "LineString"; break;
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case wkbPolygon: s << "Polygon"; break;
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case wkbMultiPoint: s << "MultiPoint"; break;
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case wkbMultiLineString: s << "MultiLineString"; break;
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case wkbMultiPolygon: s << "MultiPolygon"; break;
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case wkbGeometryCollection: s << "GeometryCollection"; break;
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case wkbPointZ: s << "PointZ"; break;
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case wkbLineStringZ: s << "LineStringZ"; break;
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case wkbPolygonZ: s << "PolygonZ"; break;
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case wkbMultiPointZ: s << "MultiPointZ"; break;
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case wkbMultiLineStringZ: s << "MultiLineStringZ"; break;
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case wkbMultiPolygonZ: s << "MultiPolygonZ"; break;
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case wkbGeometryCollectionZ: s << "GeometryCollectionZ"; break;
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default: s << "wkbUnknown(" << type << ")"; break;
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}
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return s.str();
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}
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};
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bool geometry_utils::from_wkb(boost::ptr_vector<geometry_type>& paths,
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const char* wkb,
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unsigned size,
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wkbFormat format)
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{
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unsigned geom_count = paths.size();
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wkb_reader reader(wkb, size, format);
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reader.read(paths);
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if (paths.size() > geom_count)
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return true;
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return false;
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}
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}
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