267 lines
8.9 KiB
C++
267 lines
8.9 KiB
C++
#ifndef OSMIUM_OSM_CRC_HPP
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#define OSMIUM_OSM_CRC_HPP
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/*
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This file is part of Osmium (https://osmcode.org/libosmium).
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Copyright 2013-2023 Jochen Topf <jochen@topf.org> and others (see README).
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <osmium/osm/area.hpp>
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#include <osmium/osm/box.hpp>
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#include <osmium/osm/changeset.hpp>
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#include <osmium/osm/item_type.hpp>
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#include <osmium/osm/location.hpp>
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#include <osmium/osm/node.hpp>
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#include <osmium/osm/node_ref.hpp>
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#include <osmium/osm/node_ref_list.hpp>
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#include <osmium/osm/object.hpp>
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#include <osmium/osm/relation.hpp>
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#include <osmium/osm/tag.hpp>
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#include <osmium/osm/timestamp.hpp>
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#include <osmium/osm/way.hpp>
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#include <osmium/util/endian.hpp>
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#include <cstdint>
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namespace osmium {
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inline namespace util {
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inline uint16_t byte_swap_16(uint16_t value) noexcept {
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#if defined(__GNUC__) || defined(__clang__)
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return __builtin_bswap16(value);
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#else
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return (value >> 8) | (value << 8);
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#endif
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}
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inline uint32_t byte_swap_32(uint32_t value) noexcept {
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#if defined(__GNUC__) || defined(__clang__)
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return __builtin_bswap32(value);
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#else
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return (value >> 24) |
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((value >> 8) & 0x0000FF00) |
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((value << 8) & 0x00FF0000) |
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(value << 24);
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#endif
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}
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inline uint64_t byte_swap_64(uint64_t value) noexcept {
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#if defined(__GNUC__) || defined(__clang__)
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return __builtin_bswap64(value);
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#else
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const uint64_t val1 = byte_swap_32(value & 0xFFFFFFFF);
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const uint64_t val2 = byte_swap_32(value >> 32);
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return (val1 << 32) | val2;
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#endif
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}
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} // namespace util
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/**
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* Framework for computing a checksum from OSM data. This class must be
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* instantiated with a policy class that does the actual CRC calculations.
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* It must have the process_byte(), process_bytes(), and checksum()
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* member functions implemented according to the description in Boost
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* (https://www.boost.org/doc/libs/release/libs/crc/crc.html).
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*
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* Typically you will either use the boost::crc_32_type from the Boost
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* CRC library or the osmium::CRC_zlib class which uses the zlib library
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* for this, but other checksums are possible.
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*
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* @tparam TCRC A CRC type.
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*/
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template <typename TCRC>
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class CRC {
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TCRC m_crc;
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public:
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TCRC& operator()() noexcept {
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return m_crc;
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}
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const TCRC& operator()() const noexcept {
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return m_crc;
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}
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void update_bool(const bool value) noexcept {
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m_crc.process_byte(value);
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}
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void update_int8(const uint8_t value) noexcept {
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m_crc.process_byte(value);
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}
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void update_int16(const uint16_t value) noexcept {
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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m_crc.process_bytes(&value, sizeof(uint16_t));
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#else
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const uint16_t v = osmium::byte_swap_16(value);
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m_crc.process_bytes(&v, sizeof(uint16_t));
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#endif
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}
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void update_int32(const uint32_t value) noexcept {
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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m_crc.process_bytes(&value, sizeof(uint32_t));
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#else
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const uint32_t v = osmium::byte_swap_32(value);
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m_crc.process_bytes(&v, sizeof(uint32_t));
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#endif
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}
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void update_int64(const uint64_t value) noexcept {
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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m_crc.process_bytes(&value, sizeof(uint64_t));
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#else
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const uint64_t v = osmium::byte_swap_64(value);
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m_crc.process_bytes(&v, sizeof(uint64_t));
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#endif
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}
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void update_string(const char* str) noexcept {
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while (*str) {
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m_crc.process_byte(*str++);
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}
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}
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void update(const Timestamp& timestamp) noexcept {
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update_int32(static_cast<uint32_t>(timestamp));
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}
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void update(const osmium::Location& location) noexcept {
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update_int32(location.x());
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update_int32(location.y());
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}
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void update(const osmium::Box& box) noexcept {
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update(box.bottom_left());
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update(box.top_right());
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}
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void update(const NodeRef& node_ref) noexcept {
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update_int64(static_cast<uint64_t>(node_ref.ref()));
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update(node_ref.location());
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}
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void update(const NodeRefList& node_refs) noexcept {
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for (const NodeRef& node_ref : node_refs) {
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update(node_ref);
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}
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}
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void update(const TagList& tags) noexcept {
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for (const Tag& tag : tags) {
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update_string(tag.key());
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update_string(tag.value());
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}
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}
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void update(const osmium::RelationMember& member) noexcept {
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update_int64(static_cast<uint64_t>(member.ref()));
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update_int16(static_cast<uint16_t>(member.type()));
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update_string(member.role());
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}
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void update(const osmium::RelationMemberList& members) noexcept {
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for (const RelationMember& member : members) {
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update(member);
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}
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}
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// XXX Changeset id is not added to the CRC. This is an oversight,
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// but we don't want to change this now to keep compatibility.
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void update(const osmium::OSMObject& object) noexcept {
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update_int64(static_cast<uint64_t>(object.id()));
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update_bool(object.visible());
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update_int32(object.version());
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update(object.timestamp());
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update_int32(object.uid());
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update_string(object.user());
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update(object.tags());
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}
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void update(const osmium::Node& node) noexcept {
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update(static_cast<const osmium::OSMObject&>(node));
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update(node.location());
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}
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void update(const osmium::Way& way) noexcept {
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update(static_cast<const osmium::OSMObject&>(way));
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update(way.nodes());
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}
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void update(const osmium::Relation& relation) noexcept {
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update(static_cast<const osmium::OSMObject&>(relation));
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update(relation.members());
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}
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void update(const osmium::Area& area) noexcept {
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update(static_cast<const osmium::OSMObject&>(area));
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for (const auto& subitem : area) {
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if (subitem.type() == osmium::item_type::outer_ring ||
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subitem.type() == osmium::item_type::inner_ring) {
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update(static_cast<const osmium::NodeRefList&>(subitem));
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}
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}
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}
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void update(const osmium::ChangesetDiscussion& discussion) noexcept {
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for (const auto& comment : discussion) {
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update(comment.date());
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update_int32(comment.uid());
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update_string(comment.user());
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update_string(comment.text());
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}
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}
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void update(const osmium::Changeset& changeset) noexcept {
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// The static_cast and use of update_int64 is necessary here
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// for backwards compatibility. It should have used update_int32.
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update_int64(static_cast<uint64_t>(changeset.id()));
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update(changeset.created_at());
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update(changeset.closed_at());
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update(changeset.bounds());
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update_int32(changeset.num_changes());
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update_int32(changeset.num_comments());
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update_int32(changeset.uid());
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update_string(changeset.user());
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update(changeset.tags());
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update(changeset.discussion());
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}
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}; // class CRC
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} // namespace osmium
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#endif // OSMIUM_OSM_CRC_HPP
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