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crc.hpp
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#ifndef OSMIUM_OSM_CRC_HPP
#define OSMIUM_OSM_CRC_HPP
/*
This file is part of Osmium (https://osmcode.org/libosmium).
Copyright 2013-2025 Jochen Topf <jochen@topf.org> and others (see README).
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include <osmium/osm/area.hpp>
#include <osmium/osm/box.hpp>
#include <osmium/osm/changeset.hpp>
#include <osmium/osm/item_type.hpp>
#include <osmium/osm/location.hpp>
#include <osmium/osm/node.hpp>
#include <osmium/osm/node_ref.hpp>
#include <osmium/osm/node_ref_list.hpp>
#include <osmium/osm/object.hpp>
#include <osmium/osm/relation.hpp>
#include <osmium/osm/tag.hpp>
#include <osmium/osm/timestamp.hpp>
#include <osmium/osm/way.hpp>
#include <osmium/util/endian.hpp>
#include <cstdint>
namespace osmium {
inline namespace util {
inline uint16_t byte_swap_16(uint16_t value) noexcept {
#if defined(__GNUC__) || defined(__clang__)
return __builtin_bswap16(value);
#else
return (value >> 8) | (value << 8);
#endif
}
inline uint32_t byte_swap_32(uint32_t value) noexcept {
#if defined(__GNUC__) || defined(__clang__)
return __builtin_bswap32(value);
#else
return (value >> 24) |
((value >> 8) & 0x0000FF00) |
((value << 8) & 0x00FF0000) |
(value << 24);
#endif
}
inline uint64_t byte_swap_64(uint64_t value) noexcept {
#if defined(__GNUC__) || defined(__clang__)
return __builtin_bswap64(value);
#else
const uint64_t val1 = byte_swap_32(value & 0xFFFFFFFF);
const uint64_t val2 = byte_swap_32(value >> 32);
return (val1 << 32) | val2;
#endif
}
} // namespace util
template <typename TCRC>
class CRC {
TCRC m_crc;
public:
TCRC& operator()() noexcept {
return m_crc;
}
const TCRC& operator()() const noexcept {
return m_crc;
}
void update_bool(const bool value) noexcept {
m_crc.process_byte(value);
}
void update_int8(const uint8_t value) noexcept {
m_crc.process_byte(value);
}
void update_int16(const uint16_t value) noexcept {
#if __BYTE_ORDER == __LITTLE_ENDIAN
m_crc.process_bytes(&value, sizeof(uint16_t));
#else
const uint16_t v = osmium::byte_swap_16(value);
m_crc.process_bytes(&v, sizeof(uint16_t));
#endif
}
void update_int32(const uint32_t value) noexcept {
#if __BYTE_ORDER == __LITTLE_ENDIAN
m_crc.process_bytes(&value, sizeof(uint32_t));
#else
const uint32_t v = osmium::byte_swap_32(value);
m_crc.process_bytes(&v, sizeof(uint32_t));
#endif
}
void update_int64(const uint64_t value) noexcept {
#if __BYTE_ORDER == __LITTLE_ENDIAN
m_crc.process_bytes(&value, sizeof(uint64_t));
#else
const uint64_t v = osmium::byte_swap_64(value);
m_crc.process_bytes(&v, sizeof(uint64_t));
#endif
}
void update_string(const char* str) noexcept {
while (*str) {
m_crc.process_byte(*str++);
}
}
void update(const Timestamp& timestamp) noexcept {
update_int32(static_cast<uint32_t>(timestamp));
}
void update(const osmium::Location& location) noexcept {
update_int32(location.x());
update_int32(location.y());
}
void update(const osmium::Box& box) noexcept {
update(box.bottom_left());
update(box.top_right());
}
void update(const NodeRef& node_ref) noexcept {
update_int64(static_cast<uint64_t>(node_ref.ref()));
update(node_ref.location());
}
void update(const NodeRefList& node_refs) noexcept {
for (const NodeRef& node_ref : node_refs) {
update(node_ref);
}
}
void update(const TagList& tags) noexcept {
for (const Tag& tag : tags) {
update_string(tag.key());
update_string(tag.value());
}
}
void update(const osmium::RelationMember& member) noexcept {
update_int64(static_cast<uint64_t>(member.ref()));
update_int16(static_cast<uint16_t>(member.type()));
update_string(member.role());
}
void update(const osmium::RelationMemberList& members) noexcept {
for (const RelationMember& member : members) {
update(member);
}
}
// XXX Changeset id is not added to the CRC. This is an oversight,
// but we don't want to change this now to keep compatibility.
void update(const osmium::OSMObject& object) noexcept {
update_int64(static_cast<uint64_t>(object.id()));
update_bool(object.visible());
update_int32(object.version());
update(object.timestamp());
update_int32(object.uid());
update_string(object.user());
update(object.tags());
}
void update(const osmium::Node& node) noexcept {
update(static_cast<const osmium::OSMObject&>(node));
update(node.location());
}
void update(const osmium::Way& way) noexcept {
update(static_cast<const osmium::OSMObject&>(way));
update(way.nodes());
}
void update(const osmium::Relation& relation) noexcept {
update(static_cast<const osmium::OSMObject&>(relation));
update(relation.members());
}
void update(const osmium::Area& area) noexcept {
update(static_cast<const osmium::OSMObject&>(area));
for (const auto& subitem : area) {
if (subitem.type() == osmium::item_type::outer_ring ||
subitem.type() == osmium::item_type::inner_ring) {
update(static_cast<const osmium::NodeRefList&>(subitem));
}
}
}
void update(const osmium::ChangesetDiscussion& discussion) noexcept {
for (const auto& comment : discussion) {
update(comment.date());
update_int32(comment.uid());
update_string(comment.user());
update_string(comment.text());
}
}
void update(const osmium::Changeset& changeset) noexcept {
// The static_cast and use of update_int64 is necessary here
// for backwards compatibility. It should have used update_int32.
update_int64(static_cast<uint64_t>(changeset.id()));
update(changeset.created_at());
update(changeset.closed_at());
update(changeset.bounds());
update_int32(changeset.num_changes());
update_int32(changeset.num_comments());
update_int32(changeset.uid());
update_string(changeset.user());
update(changeset.tags());
update(changeset.discussion());
}
}; // class CRC
} // namespace osmium
#endif // OSMIUM_OSM_CRC_HPP
area.hpp
box.hpp
changeset.hpp
osmium::Area
Definition area.hpp:125
osmium::CRC
Definition crc.hpp:102
osmium::CRC::update
void update(const osmium::Changeset &changeset) noexcept
Definition crc.hpp:247
osmium::CRC::update
void update(const osmium::RelationMemberList &members) noexcept
Definition crc.hpp:195
osmium::CRC::update_string
void update_string(const char *str) noexcept
Definition crc.hpp:151
osmium::CRC::update
void update(const osmium::Box &box) noexcept
Definition crc.hpp:166
osmium::CRC::update
void update(const osmium::RelationMember &member) noexcept
Definition crc.hpp:189
osmium::CRC::update
void update(const osmium::OSMObject &object) noexcept
Definition crc.hpp:203
osmium::CRC::update
void update(const Timestamp &timestamp) noexcept
Definition crc.hpp:157
osmium::CRC::operator()
const TCRC & operator()() const noexcept
Definition crc.hpp:112
osmium::CRC::update
void update(const osmium::Node &node) noexcept
Definition crc.hpp:213
osmium::CRC::update
void update(const osmium::Way &way) noexcept
Definition crc.hpp:218
osmium::CRC::operator()
TCRC & operator()() noexcept
Definition crc.hpp:108
osmium::CRC::update
void update(const osmium::Area &area) noexcept
Definition crc.hpp:228
osmium::CRC::update_int8
void update_int8(const uint8_t value) noexcept
Definition crc.hpp:120
osmium::CRC::update_int64
void update_int64(const uint64_t value) noexcept
Definition crc.hpp:142
osmium::CRC::update_int16
void update_int16(const uint16_t value) noexcept
Definition crc.hpp:124
osmium::CRC::update_bool
void update_bool(const bool value) noexcept
Definition crc.hpp:116
osmium::CRC::update
void update(const NodeRefList &node_refs) noexcept
Definition crc.hpp:176
osmium::CRC::update
void update(const NodeRef &node_ref) noexcept
Definition crc.hpp:171
osmium::CRC::update
void update(const osmium::ChangesetDiscussion &discussion) noexcept
Definition crc.hpp:238
osmium::CRC::update_int32
void update_int32(const uint32_t value) noexcept
Definition crc.hpp:133
osmium::CRC::update
void update(const osmium::Location &location) noexcept
Definition crc.hpp:161
osmium::CRC::update
void update(const osmium::Relation &relation) noexcept
Definition crc.hpp:223
osmium::CRC::update
void update(const TagList &tags) noexcept
Definition crc.hpp:182
osmium::CRC::m_crc
TCRC m_crc
Definition crc.hpp:104
osmium::ChangesetDiscussion
Definition changeset.hpp:130
osmium::Changeset
An OSM Changeset, a group of changes made by a single user over a short period of time.
Definition changeset.hpp:146
osmium::Location
Definition location.hpp:271
osmium::NodeRefList
Definition node_ref_list.hpp:52
osmium::NodeRef
Definition node_ref.hpp:50
osmium::Node
Definition node.hpp:48
osmium::OSMObject
Definition object.hpp:64
osmium::RelationMemberList
Definition relation.hpp:147
osmium::RelationMember
Definition relation.hpp:56
osmium::Relation
Definition relation.hpp:161
osmium::TagList
Definition tag.hpp:119
osmium::Tag
Definition tag.hpp:48
osmium::Timestamp
Definition timestamp.hpp:175
osmium::Way
Definition way.hpp:72
endian.hpp
item_type.hpp
location.hpp
osmium::util::byte_swap_16
uint16_t byte_swap_16(uint16_t value) noexcept
Definition crc.hpp:57
osmium::util::byte_swap_64
uint64_t byte_swap_64(uint64_t value) noexcept
Definition crc.hpp:76
osmium::util::byte_swap_32
uint32_t byte_swap_32(uint32_t value) noexcept
Definition crc.hpp:65
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
osmium::item_type::relation
@ relation
osmium::item_type::node
@ node
osmium::item_type::changeset
@ changeset
osmium::item_type::way
@ way
osmium::item_type::outer_ring
@ outer_ring
osmium::item_type::inner_ring
@ inner_ring
node.hpp
node_ref.hpp
node_ref_list.hpp
object.hpp
relation.hpp
tag.hpp
timestamp.hpp
way.hpp