420 lines
13 KiB
C++
420 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) 2015 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/make_unique.hpp>
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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/feature.hpp>
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#include <mapnik/util/noncopyable.hpp>
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#include <mapnik/geometry_correct.hpp>
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#include <memory>
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namespace mapnik
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{
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struct wkb_reader : util::noncopyable
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{
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private:
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const char* wkb_;
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std::size_t size_;
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std::size_t 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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// Z
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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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// M
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wkbPointM=2001,
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wkbLineStringM=2002,
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wkbPolygonM=2003,
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wkbMultiPointM=2004,
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wkbMultiLineStringM=2005,
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wkbMultiPolygonM=2006,
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wkbGeometryCollectionM=2007,
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// ZM
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wkbPointZM=3001,
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wkbLineStringZM=3002,
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wkbPolygonZM=3003,
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wkbMultiPointZM=3004,
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wkbMultiLineStringZM=3005,
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wkbMultiPolygonZM=3006,
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wkbGeometryCollectionZM=3007
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};
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wkb_reader(const char* wkb, std::size_t 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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&& static_cast<unsigned char>(wkb_[0]) == static_cast<unsigned char>(0x00)
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&& static_cast<unsigned char>(wkb_[38]) == static_cast<unsigned char>(0x7C)
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&& static_cast<unsigned char>(wkb_[size_ - 1]) == static_cast<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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needSwap_ = byteOrder_ ? wkbXDR : wkbNDR;
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}
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mapnik::geometry::geometry<double> read()
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{
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mapnik::geometry::geometry<double> geom = mapnik::geometry::geometry_empty();
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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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geom = read_point();
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break;
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case wkbLineString:
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geom = read_linestring();
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break;
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case wkbPolygon:
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geom = read_polygon();
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break;
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case wkbMultiPoint:
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geom = read_multipoint();
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break;
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case wkbMultiLineString:
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geom = read_multilinestring();
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break;
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case wkbMultiPolygon:
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geom = read_multipolygon();
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break;
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case wkbGeometryCollection:
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geom = read_collection();
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break;
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case wkbPointZ:
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case wkbPointM:
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geom = read_point<true>();
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break;
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case wkbPointZM:
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geom = read_point<true,true>();
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break;
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case wkbLineStringZ:
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case wkbLineStringM:
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geom = read_linestring<true>();
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break;
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case wkbLineStringZM:
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geom = read_linestring<true,true>();
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break;
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case wkbPolygonZ:
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case wkbPolygonM:
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geom = read_polygon<true>();
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break;
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case wkbPolygonZM:
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geom = read_polygon<true,true>();
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break;
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case wkbMultiPointZ:
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case wkbMultiPointM:
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geom = read_multipoint<true>();
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break;
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case wkbMultiPointZM:
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geom = read_multipoint<true,true>();
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break;
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case wkbMultiLineStringZ:
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case wkbMultiLineStringM:
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geom = read_multilinestring<true>();
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break;
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case wkbMultiLineStringZM:
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geom = read_multilinestring<true,true>();
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break;
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case wkbMultiPolygonZ:
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case wkbMultiPolygonM:
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geom = read_multipolygon<true>();
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break;
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case wkbMultiPolygonZM:
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geom = read_multipolygon<true,true>();
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break;
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case wkbGeometryCollectionZ:
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case wkbGeometryCollectionM:
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case wkbGeometryCollectionZM:
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geom = read_collection();
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break;
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default:
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break;
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}
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return geom;
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}
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private:
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int read_integer()
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{
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std::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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template <typename Ring, bool Z = false, bool M = false>
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void read_coords(Ring & ring, std::size_t num_points)
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{
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double x,y;
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if (!needSwap_)
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{
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for (std::size_t i = 0; i < num_points; ++i)
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{
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read_double_ndr(wkb_ + pos_, x);
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read_double_ndr(wkb_ + pos_ + 8, y);
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ring.emplace_back(x,y);
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pos_ += 16; // skip XY
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if (Z) pos_ += 8;
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if (M) pos_ += 8;
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}
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}
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else
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{
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for (std::size_t i = 0; i < num_points; ++i)
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{
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read_double_xdr(wkb_ + pos_, x);
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read_double_xdr(wkb_ + pos_ + 8, y);
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ring.emplace_back(x,y);
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pos_ += 16; // skip XY
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if (Z) pos_ += 8;
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if (M) pos_ += 8;
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}
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}
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}
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template <bool Z = false, bool M = false>
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mapnik::geometry::point<double> read_point()
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{
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double x = read_double();
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double y = read_double();
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if (Z) pos_ += 8;
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if (M) pos_ += 8;
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return mapnik::geometry::point<double>(x, y);
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}
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template <bool Z = false, bool M = false>
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mapnik::geometry::multi_point<double> read_multipoint()
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{
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mapnik::geometry::multi_point<double> multi_point;
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int num_points = read_integer();
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multi_point.reserve(num_points);
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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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multi_point.emplace_back(read_point<Z,M>());
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}
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return multi_point;
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}
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template <bool M = false, bool Z = false>
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mapnik::geometry::line_string<double> read_linestring()
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{
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mapnik::geometry::line_string<double> line;
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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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line.reserve(num_points);
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read_coords<mapnik::geometry::line_string<double>, M, Z>(line, num_points);
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}
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return line;
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}
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template <bool M = false, bool Z = false>
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mapnik::geometry::multi_line_string<double> read_multilinestring()
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{
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int num_lines = read_integer();
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mapnik::geometry::multi_line_string<double> multi_line;
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multi_line.reserve(num_lines);
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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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multi_line.push_back(read_linestring<M, Z>());
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}
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return multi_line;
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}
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template <bool M = false, bool Z = false>
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mapnik::geometry::polygon<double> read_polygon()
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{
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int num_rings = read_integer();
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mapnik::geometry::polygon<double> poly;
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if (num_rings > 1)
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{
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poly.interior_rings.reserve(num_rings - 1);
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}
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for (int i = 0; i < num_rings; ++i)
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{
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mapnik::geometry::linear_ring<double> ring;
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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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ring.reserve(num_points);
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read_coords<mapnik::geometry::linear_ring<double>, M, Z>(ring, num_points);
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}
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if ( i == 0) poly.set_exterior_ring(std::move(ring));
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else poly.add_hole(std::move(ring));
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}
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return poly;
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}
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template <bool M = false, bool Z = false>
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mapnik::geometry::multi_polygon<double> read_multipolygon()
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{
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int num_polys = read_integer();
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mapnik::geometry::multi_polygon<double> multi_poly;
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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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multi_poly.push_back(read_polygon<M, Z>());
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}
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return multi_poly;
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}
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mapnik::geometry::geometry_collection<double> read_collection()
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{
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int num_geometries = read_integer();
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mapnik::geometry::geometry_collection<double> collection;
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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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collection.push_back(read());
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}
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return collection;
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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 wkbPointZ: s << "PointZ"; break;
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case wkbPointM: s << "PointM"; break;
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case wkbPointZM: s << "PointZM"; break;
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case wkbMultiPoint: s << "MultiPoint"; break;
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case wkbMultiPointZ: s << "MultiPointZ"; break;
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case wkbMultiPointM: s << "MultiPointM"; break;
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case wkbMultiPointZM: s << "MultiPointZM"; break;
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case wkbLineString: s << "LineString"; break;
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case wkbLineStringZ: s << "LineStringZ"; break;
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case wkbLineStringM: s << "LineStringM"; break;
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case wkbLineStringZM: s << "LineStringZM"; break;
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case wkbMultiLineString: s << "MultiLineString"; break;
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case wkbMultiLineStringZ: s << "MultiLineStringZ"; break;
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case wkbMultiLineStringM: s << "MultiLineStringM"; break;
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case wkbMultiLineStringZM: s << "MultiLineStringZM"; break;
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case wkbPolygon: s << "Polygon"; break;
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case wkbPolygonZ: s << "PolygonZ"; break;
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case wkbPolygonM: s << "PolygonM"; break;
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case wkbPolygonZM: s << "PolygonZM"; break;
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case wkbMultiPolygon: s << "MultiPolygon"; break;
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case wkbMultiPolygonZ: s << "MultiPolygonZ"; break;
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case wkbMultiPolygonM: s << "MultiPolygonM"; break;
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case wkbMultiPolygonZM: s << "MultiPolygonZM"; break;
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case wkbGeometryCollection: s << "GeometryCollection"; break;
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case wkbGeometryCollectionZ: s << "GeometryCollectionZ"; break;
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case wkbGeometryCollectionM: s << "GeometryCollectionM"; break;
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case wkbGeometryCollectionZM:s << "GeometryCollectionZM"; 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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mapnik::geometry::geometry<double> geometry_utils::from_wkb(const char* wkb,
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std::size_t size,
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wkbFormat format)
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{
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wkb_reader reader(wkb, size, format);
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mapnik::geometry::geometry<double> geom(reader.read());
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// note: this will only be applied to polygons
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mapnik::geometry::correct(geom);
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return geom;
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}
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} // namespace mapnik
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