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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2025 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef SHAPEFILE_HPP
#define SHAPEFILE_HPP
// stl
#include <cstring>
#include <fstream>
#include <stdexcept>
#include <cstdint>
// mapnik
#include <mapnik/global.hpp>
#include <mapnik/util/utf_conv_win.hpp>
#include <mapnik/geometry/box2d.hpp>
#include <mapnik/util/mapped_memory_file.hpp>
using mapnik::box2d;
using mapnik::read_double_ndr;
using mapnik::read_double_xdr;
using mapnik::read_int32_ndr;
using mapnik::read_int32_xdr;
struct RecordTag
{
using data_type = char*;
static data_type alloc(unsigned size) { return static_cast<data_type>(::operator new(sizeof(char) * size)); }
static void dealloc(data_type data) { ::operator delete(data); }
};
struct MappedRecordTag
{
using data_type = char const*;
static data_type alloc(unsigned) { return 0; }
static void dealloc(data_type) {}
};
template<typename Tag>
struct shape_record
{
typename Tag::data_type data;
std::size_t size;
mutable std::size_t pos;
explicit shape_record(size_t size_)
: data(Tag::alloc(size_)),
size(size_),
pos(0)
{}
~shape_record() { Tag::dealloc(data); }
void set_data(typename Tag::data_type data_) { data = data_; }
typename Tag::data_type get_data() { return data; }
void skip(unsigned n) { pos += n; }
void set_pos(unsigned pos_) { pos = pos_; }
int read_ndr_integer()
{
std::int32_t val;
read_int32_ndr(&data[pos], val);
pos += 4;
return val;
}
int read_xdr_integer()
{
std::int32_t val;
read_int32_xdr(&data[pos], val);
pos += 4;
return val;
}
double read_double()
{
double val;
read_double_ndr(&data[pos], val);
pos += 8;
return val;
}
long remains() { return (size - pos); }
std::size_t length() { return size; }
};
class shape_file : public mapnik::util::mapped_memory_file
{
public:
#if defined(MAPNIK_MEMORY_MAPPED_FILE)
using record_type = shape_record<MappedRecordTag>;
#else
using record_type = shape_record<RecordTag>;
#endif
shape_file() {}
shape_file(std::string const& file_name)
: mapped_memory_file(file_name)
{}
inline void read_record(record_type& rec)
{
#if defined(MAPNIK_MEMORY_MAPPED_FILE)
rec.set_data(file_.buffer().first + file_.tellg());
file_.seekg(rec.size, std::ios::cur);
#else
file_.read(rec.get_data(), rec.size);
#endif
}
inline int read_xdr_integer()
{
char b[4];
file_.read(b, 4);
std::int32_t val;
read_int32_xdr(b, val);
return val;
}
inline int read_ndr_integer()
{
char b[4];
file_.read(b, 4);
std::int32_t val;
read_int32_ndr(b, val);
return val;
}
inline double read_double()
{
double val;
file_.read(reinterpret_cast<char*>(&val), 8);
return val;
}
inline void read_envelope(box2d<double>& envelope)
{
file_.read(reinterpret_cast<char*>(&envelope), sizeof(envelope));
}
inline void rewind() { seek(100); }
inline void seek(std::streampos pos) { file_.seekg(pos, std::ios::beg); }
inline std::streampos pos() { return file_.tellg(); }
inline bool is_eof() { return file_.eof(); }
inline bool is_good() { return file_.good(); }
};
#endif // SHAPEFILE_HPP
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