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118 lines
4.6 KiB
118 lines
4.6 KiB
5 months ago
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#ifndef SQL_GIS_WKB_H_INCLUDED
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#define SQL_GIS_WKB_H_INCLUDED
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// Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License, version 2.0,
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// as published by the Free Software Foundation.
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//
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// This program is also distributed with certain software (including
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// but not limited to OpenSSL) that is licensed under separate terms,
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// as designated in a particular file or component or in included license
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// documentation. The authors of MySQL hereby grant you an additional
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// permission to link the program and your derivative works with the
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// separately licensed software that they have included with MySQL.
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//
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// This program 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
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// GNU General Public License, version 2.0, for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; 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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/// @file
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///
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/// This file declares the interface of the WKB parser for geometries and the
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/// parser for the internal geometry representation.
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#include <memory> // std::unique_ptr
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#include "sql/gis/geometries.h"
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#include "sql/gis/srid.h"
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class THD;
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class String;
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namespace dd {
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class Spatial_reference_system;
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}
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namespace gis {
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/// Parses an SRID from a little-endian string.
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///
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/// @param[in] str The string.
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/// @param[in] length Length of the string.
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/// @param[out] srid The SRID read from the string.
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///
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/// @retval false Success.
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/// @retval true Error. my_error() has not been called.
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bool parse_srid(const char *str, std::size_t length, srid_t *srid);
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///
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/// Parses a geometry WKB string and constructs a geometry object.
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///
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/// The geometry is allocated on the heap and ownership is transferred to the
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/// caller.
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///
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/// If ignore_axis_order is true, the string is assumed to be on the geometry
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/// storage format, not general WKB. The storage format differs from ordinary
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/// WKB by having a fixed x=longitude, y=latitude mapping.
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///
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/// @warning This function checks if there are so many nested levels of geometry
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/// collections that the stack will be exhausted. If that happens, my_error is
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/// called and the function exits with no geometry value. However, if thd is
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/// nullptr, this check is disabled, and the caller is responsible for checking
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/// that there is enough stack to parse the WKB string.
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///
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/// @param[in] thd Thread handle.
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/// @param srs The SRS of the geometry.
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/// @param wkb The WKB string.
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/// @param length Length of the WKB string.
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/// @param ignore_axis_order Ignore SRS axis order and assume it's always
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/// long-lat.
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///
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/// @return The geometry. If an error occurred, the return value is a null
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/// pointer. In case of stack overrun, my_error has been called.
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std::unique_ptr<Geometry> parse_wkb(THD *thd,
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const dd::Spatial_reference_system *srs,
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const char *wkb, std::size_t length,
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bool ignore_axis_order = false);
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/// Parses a little-endian geometry string (SRID + WKB).
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///
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/// The geometry is allocated on the heap and ownership is transferred to the
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/// caller.
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///
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/// @param[in] thd Thread handle
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/// @param[in] func_name The function name to use in error messages.
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/// @param[in] str The geometry string.
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/// @param[out] srs The spatial reference system of the geometry.
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/// @param[out] geometry The geometry.
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/// @param[in] treat_unknown_srid_as_cartesian Whether to treat unknown
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/// SRIDs as Cartesian. If false, raise an error if the SRID is unknown.
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///
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/// @retval false Success.
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/// @retval true Error. my_error() has been called.
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bool parse_geometry(THD *thd, const char *func_name, const String *str,
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const dd::Spatial_reference_system **srs,
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std::unique_ptr<Geometry> *geometry,
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bool treat_unknown_srid_as_cartesian = false);
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/// Writes a little-endian geometry string (SRID + WKB).
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///
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/// @param[in] srs The SRS of the geometry.
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/// @param[in] geometry The geometry.
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/// @param[out] str The string to write the geometry to.
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///
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/// @retval false Success.
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/// @retval true Error. my_error() has been called.
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bool write_geometry(const dd::Spatial_reference_system *srs, Geometry &geometry,
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String *str);
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} // namespace gis
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#endif // SQL_GIS_WKB_H_INCLUDED
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