632 lines
25 KiB
C++
632 lines
25 KiB
C++
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#ifndef OSMIUM_IO_DETAIL_O5M_INPUT_FORMAT_HPP
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#define OSMIUM_IO_DETAIL_O5M_INPUT_FORMAT_HPP
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/*
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This file is part of Osmium (http://osmcode.org/libosmium).
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Copyright 2013-2017 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 <algorithm>
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#include <cstddef>
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#include <cstdint>
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#include <cstring>
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#include <future>
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#include <memory>
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#include <string>
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#include <utility>
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#include <protozero/exception.hpp>
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#include <protozero/varint.hpp>
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#include <osmium/builder/osm_object_builder.hpp>
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#include <osmium/io/detail/input_format.hpp>
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#include <osmium/io/detail/queue_util.hpp>
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#include <osmium/io/error.hpp>
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#include <osmium/io/file_format.hpp>
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#include <osmium/io/header.hpp>
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#include <osmium/memory/buffer.hpp>
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#include <osmium/osm/box.hpp>
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#include <osmium/osm/entity_bits.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/object.hpp>
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#include <osmium/osm/relation.hpp>
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#include <osmium/osm/timestamp.hpp>
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#include <osmium/osm/types.hpp>
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#include <osmium/osm/way.hpp>
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#include <osmium/thread/util.hpp>
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#include <osmium/util/cast.hpp>
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#include <osmium/util/delta.hpp>
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namespace osmium {
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namespace builder {
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class Builder;
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} // namespace builder
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/**
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* Exception thrown when the o5m deocder failed. The exception contains
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* (if available) information about the place where the error happened
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* and the type of error.
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*/
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struct o5m_error : public io_error {
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explicit o5m_error(const char* what) :
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io_error(std::string{"o5m format error: "} + what) {
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}
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}; // struct o5m_error
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namespace io {
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namespace detail {
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// Implementation of the o5m/o5c file formats according to the
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// description at http://wiki.openstreetmap.org/wiki/O5m .
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class ReferenceTable {
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// The following settings are from the o5m description:
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// The maximum number of entries in this table.
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const uint64_t number_of_entries = 15000;
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// The size of one entry in the table.
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const unsigned int entry_size = 256;
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// The maximum length of a string in the table including
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// two \0 bytes.
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const unsigned int max_length = 250 + 2;
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// The data is stored in this string. It is default constructed
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// and then resized on demand the first time something is added.
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// This is done because the ReferenceTable is in a O5mParser
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// object which will be copied from one thread to another. This
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// way the string is still small when it is copied.
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std::string m_table;
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unsigned int current_entry = 0;
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public:
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void clear() {
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current_entry = 0;
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}
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void add(const char* string, std::size_t size) {
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if (m_table.empty()) {
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m_table.resize(entry_size * number_of_entries);
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}
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if (size <= max_length) {
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std::copy_n(string, size, &m_table[current_entry * entry_size]);
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if (++current_entry == number_of_entries) {
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current_entry = 0;
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}
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}
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}
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const char* get(uint64_t index) const {
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if (m_table.empty() || index == 0 || index > number_of_entries) {
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throw o5m_error{"reference to non-existing string in table"};
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}
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auto entry = (current_entry + number_of_entries - index) % number_of_entries;
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return &m_table[entry * entry_size];
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}
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}; // class ReferenceTable
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class O5mParser : public Parser {
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static constexpr int buffer_size = 2 * 1000 * 1000;
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osmium::io::Header m_header;
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osmium::memory::Buffer m_buffer;
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std::string m_input;
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const char* m_data;
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const char* m_end;
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ReferenceTable m_reference_table;
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static int64_t zvarint(const char** data, const char* end) {
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return protozero::decode_zigzag64(protozero::decode_varint(data, end));
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}
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bool ensure_bytes_available(std::size_t need_bytes) {
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if ((m_end - m_data) >= long(need_bytes)) {
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return true;
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}
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if (input_done() && (m_input.size() < need_bytes)) {
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return false;
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}
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m_input.erase(0, m_data - m_input.data());
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while (m_input.size() < need_bytes) {
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const std::string data{get_input()};
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if (input_done()) {
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return false;
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}
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m_input.append(data);
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}
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m_data = m_input.data();
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m_end = m_input.data() + m_input.size();
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return true;
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}
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void check_header_magic() {
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static const unsigned char header_magic[] = { 0xff, 0xe0, 0x04, 'o', '5' };
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if (std::strncmp(reinterpret_cast<const char*>(header_magic), m_data, sizeof(header_magic))) {
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throw o5m_error{"wrong header magic"};
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}
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m_data += sizeof(header_magic);
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}
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void check_file_type() {
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if (*m_data == 'm') { // o5m data file
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m_header.set_has_multiple_object_versions(false);
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} else if (*m_data == 'c') { // o5c change file
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m_header.set_has_multiple_object_versions(true);
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} else {
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throw o5m_error{"wrong header magic"};
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}
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m_data++;
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}
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void check_file_format_version() {
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if (*m_data != '2') {
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throw o5m_error{"wrong header magic"};
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}
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m_data++;
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}
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void decode_header() {
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if (! ensure_bytes_available(7)) { // overall length of header
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throw o5m_error{"file too short (incomplete header info)"};
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}
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check_header_magic();
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check_file_type();
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check_file_format_version();
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}
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void mark_header_as_done() {
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set_header_value(m_header);
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}
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osmium::util::DeltaDecode<osmium::object_id_type> m_delta_id;
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osmium::util::DeltaDecode<int64_t> m_delta_timestamp;
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osmium::util::DeltaDecode<osmium::changeset_id_type> m_delta_changeset;
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osmium::util::DeltaDecode<int64_t> m_delta_lon;
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osmium::util::DeltaDecode<int64_t> m_delta_lat;
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osmium::util::DeltaDecode<osmium::object_id_type> m_delta_way_node_id;
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osmium::util::DeltaDecode<osmium::object_id_type> m_delta_member_ids[3];
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void reset() {
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m_reference_table.clear();
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m_delta_id.clear();
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m_delta_timestamp.clear();
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m_delta_changeset.clear();
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m_delta_lon.clear();
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m_delta_lat.clear();
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m_delta_way_node_id.clear();
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m_delta_member_ids[0].clear();
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m_delta_member_ids[1].clear();
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m_delta_member_ids[2].clear();
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}
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const char* decode_string(const char** dataptr, const char* const end) {
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if (**dataptr == 0x00) { // get inline string
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(*dataptr)++;
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if (*dataptr == end) {
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throw o5m_error{"string format error"};
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}
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return *dataptr;
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} else { // get from reference table
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auto index = protozero::decode_varint(dataptr, end);
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return m_reference_table.get(index);
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}
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}
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std::pair<osmium::user_id_type, const char*> decode_user(const char** dataptr, const char* const end) {
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bool update_pointer = (**dataptr == 0x00);
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const char* data = decode_string(dataptr, end);
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const char* start = data;
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auto uid = protozero::decode_varint(&data, end);
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if (data == end) {
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throw o5m_error{"missing user name"};
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}
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const char* user = ++data;
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if (uid == 0 && update_pointer) {
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m_reference_table.add("\0\0", 2);
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*dataptr = data;
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return std::make_pair(0, "");
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}
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while (*data++) {
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if (data == end) {
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throw o5m_error{"no null byte in user name"};
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}
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}
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if (update_pointer) {
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m_reference_table.add(start, data - start);
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*dataptr = data;
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}
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return std::make_pair(static_cast_with_assert<osmium::user_id_type>(uid), user);
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}
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void decode_tags(osmium::builder::Builder& parent, const char** dataptr, const char* const end) {
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osmium::builder::TagListBuilder builder{parent};
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while (*dataptr != end) {
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bool update_pointer = (**dataptr == 0x00);
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const char* data = decode_string(dataptr, end);
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const char* start = data;
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while (*data++) {
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if (data == end) {
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throw o5m_error{"no null byte in tag key"};
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}
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}
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const char* value = data;
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while (*data++) {
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if (data == end) {
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throw o5m_error{"no null byte in tag value"};
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}
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}
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if (update_pointer) {
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m_reference_table.add(start, data - start);
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*dataptr = data;
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}
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builder.add_tag(start, value);
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}
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}
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const char* decode_info(osmium::OSMObject& object, const char** dataptr, const char* const end) {
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const char* user = "";
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if (**dataptr == 0x00) { // no info section
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++*dataptr;
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} else { // has info section
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object.set_version(static_cast_with_assert<object_version_type>(protozero::decode_varint(dataptr, end)));
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auto timestamp = m_delta_timestamp.update(zvarint(dataptr, end));
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if (timestamp != 0) { // has timestamp
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object.set_timestamp(timestamp);
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object.set_changeset(m_delta_changeset.update(zvarint(dataptr, end)));
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if (*dataptr != end) {
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auto uid_user = decode_user(dataptr, end);
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object.set_uid(uid_user.first);
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user = uid_user.second;
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} else {
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object.set_uid(user_id_type(0));
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}
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}
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}
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return user;
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}
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void decode_node(const char* data, const char* const end) {
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osmium::builder::NodeBuilder builder{m_buffer};
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builder.set_id(m_delta_id.update(zvarint(&data, end)));
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builder.set_user(decode_info(builder.object(), &data, end));
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if (data == end) {
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// no location, object is deleted
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builder.set_visible(false);
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builder.set_location(osmium::Location{});
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} else {
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auto lon = m_delta_lon.update(zvarint(&data, end));
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auto lat = m_delta_lat.update(zvarint(&data, end));
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builder.set_location(osmium::Location{lon, lat});
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if (data != end) {
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decode_tags(builder, &data, end);
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}
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}
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}
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void decode_way(const char* data, const char* const end) {
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|
|
osmium::builder::WayBuilder builder{m_buffer};
|
||
|
|
|
||
|
|
builder.set_id(m_delta_id.update(zvarint(&data, end)));
|
||
|
|
|
||
|
|
builder.set_user(decode_info(builder.object(), &data, end));
|
||
|
|
|
||
|
|
if (data == end) {
|
||
|
|
// no reference section, object is deleted
|
||
|
|
builder.set_visible(false);
|
||
|
|
} else {
|
||
|
|
auto reference_section_length = protozero::decode_varint(&data, end);
|
||
|
|
if (reference_section_length > 0) {
|
||
|
|
const char* const end_refs = data + reference_section_length;
|
||
|
|
if (end_refs > end) {
|
||
|
|
throw o5m_error{"way nodes ref section too long"};
|
||
|
|
}
|
||
|
|
|
||
|
|
osmium::builder::WayNodeListBuilder wn_builder{builder};
|
||
|
|
|
||
|
|
while (data < end_refs) {
|
||
|
|
wn_builder.add_node_ref(m_delta_way_node_id.update(zvarint(&data, end)));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (data != end) {
|
||
|
|
decode_tags(builder, &data, end);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
osmium::item_type decode_member_type(char c) {
|
||
|
|
if (c < '0' || c > '2') {
|
||
|
|
throw o5m_error{"unknown member type"};
|
||
|
|
}
|
||
|
|
return osmium::nwr_index_to_item_type(c - '0');
|
||
|
|
}
|
||
|
|
|
||
|
|
std::pair<osmium::item_type, const char*> decode_role(const char** dataptr, const char* const end) {
|
||
|
|
bool update_pointer = (**dataptr == 0x00);
|
||
|
|
const char* data = decode_string(dataptr, end);
|
||
|
|
const char* start = data;
|
||
|
|
|
||
|
|
auto member_type = decode_member_type(*data++);
|
||
|
|
if (data == end) {
|
||
|
|
throw o5m_error{"missing role"};
|
||
|
|
}
|
||
|
|
const char* role = data;
|
||
|
|
|
||
|
|
while (*data++) {
|
||
|
|
if (data == end) {
|
||
|
|
throw o5m_error{"no null byte in role"};
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (update_pointer) {
|
||
|
|
m_reference_table.add(start, data - start);
|
||
|
|
*dataptr = data;
|
||
|
|
}
|
||
|
|
|
||
|
|
return std::make_pair(member_type, role);
|
||
|
|
}
|
||
|
|
|
||
|
|
void decode_relation(const char* data, const char* const end) {
|
||
|
|
osmium::builder::RelationBuilder builder{m_buffer};
|
||
|
|
|
||
|
|
builder.set_id(m_delta_id.update(zvarint(&data, end)));
|
||
|
|
|
||
|
|
builder.set_user(decode_info(builder.object(), &data, end));
|
||
|
|
|
||
|
|
if (data == end) {
|
||
|
|
// no reference section, object is deleted
|
||
|
|
builder.set_visible(false);
|
||
|
|
} else {
|
||
|
|
auto reference_section_length = protozero::decode_varint(&data, end);
|
||
|
|
if (reference_section_length > 0) {
|
||
|
|
const char* const end_refs = data + reference_section_length;
|
||
|
|
if (end_refs > end) {
|
||
|
|
throw o5m_error{"relation format error"};
|
||
|
|
}
|
||
|
|
|
||
|
|
osmium::builder::RelationMemberListBuilder rml_builder{builder};
|
||
|
|
|
||
|
|
while (data < end_refs) {
|
||
|
|
auto delta_id = zvarint(&data, end);
|
||
|
|
if (data == end) {
|
||
|
|
throw o5m_error{"relation member format error"};
|
||
|
|
}
|
||
|
|
auto type_role = decode_role(&data, end);
|
||
|
|
auto i = osmium::item_type_to_nwr_index(type_role.first);
|
||
|
|
auto ref = m_delta_member_ids[i].update(delta_id);
|
||
|
|
rml_builder.add_member(type_role.first, ref, type_role.second);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (data != end) {
|
||
|
|
decode_tags(builder, &data, end);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void decode_bbox(const char* data, const char* const end) {
|
||
|
|
auto sw_lon = zvarint(&data, end);
|
||
|
|
auto sw_lat = zvarint(&data, end);
|
||
|
|
auto ne_lon = zvarint(&data, end);
|
||
|
|
auto ne_lat = zvarint(&data, end);
|
||
|
|
|
||
|
|
m_header.add_box(osmium::Box{osmium::Location{sw_lon, sw_lat},
|
||
|
|
osmium::Location{ne_lon, ne_lat}});
|
||
|
|
}
|
||
|
|
|
||
|
|
void decode_timestamp(const char* data, const char* const end) {
|
||
|
|
auto timestamp = osmium::Timestamp(zvarint(&data, end)).to_iso();
|
||
|
|
m_header.set("o5m_timestamp", timestamp);
|
||
|
|
m_header.set("timestamp", timestamp);
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush() {
|
||
|
|
osmium::memory::Buffer buffer(buffer_size);
|
||
|
|
using std::swap;
|
||
|
|
swap(m_buffer, buffer);
|
||
|
|
send_to_output_queue(std::move(buffer));
|
||
|
|
}
|
||
|
|
|
||
|
|
enum class dataset_type : unsigned char {
|
||
|
|
node = 0x10,
|
||
|
|
way = 0x11,
|
||
|
|
relation = 0x12,
|
||
|
|
bounding_box = 0xdb,
|
||
|
|
timestamp = 0xdc,
|
||
|
|
header = 0xe0,
|
||
|
|
sync = 0xee,
|
||
|
|
jump = 0xef,
|
||
|
|
reset = 0xff
|
||
|
|
};
|
||
|
|
|
||
|
|
void decode_data() {
|
||
|
|
while (ensure_bytes_available(1)) {
|
||
|
|
dataset_type ds_type = dataset_type(*m_data++);
|
||
|
|
if (ds_type > dataset_type::jump) {
|
||
|
|
if (ds_type == dataset_type::reset) {
|
||
|
|
reset();
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
ensure_bytes_available(protozero::max_varint_length);
|
||
|
|
|
||
|
|
uint64_t length = 0;
|
||
|
|
try {
|
||
|
|
length = protozero::decode_varint(&m_data, m_end);
|
||
|
|
} catch (const protozero::end_of_buffer_exception&) {
|
||
|
|
throw o5m_error{"premature end of file"};
|
||
|
|
}
|
||
|
|
|
||
|
|
if (! ensure_bytes_available(length)) {
|
||
|
|
throw o5m_error{"premature end of file"};
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (ds_type) {
|
||
|
|
case dataset_type::node:
|
||
|
|
mark_header_as_done();
|
||
|
|
if (read_types() & osmium::osm_entity_bits::node) {
|
||
|
|
decode_node(m_data, m_data + length);
|
||
|
|
m_buffer.commit();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case dataset_type::way:
|
||
|
|
mark_header_as_done();
|
||
|
|
if (read_types() & osmium::osm_entity_bits::way) {
|
||
|
|
decode_way(m_data, m_data + length);
|
||
|
|
m_buffer.commit();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case dataset_type::relation:
|
||
|
|
mark_header_as_done();
|
||
|
|
if (read_types() & osmium::osm_entity_bits::relation) {
|
||
|
|
decode_relation(m_data, m_data + length);
|
||
|
|
m_buffer.commit();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case dataset_type::bounding_box:
|
||
|
|
decode_bbox(m_data, m_data + length);
|
||
|
|
break;
|
||
|
|
case dataset_type::timestamp:
|
||
|
|
decode_timestamp(m_data, m_data + length);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
// ignore unknown datasets
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (read_types() == osmium::osm_entity_bits::nothing && header_is_done()) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
m_data += length;
|
||
|
|
|
||
|
|
if (m_buffer.committed() > buffer_size / 10 * 9) {
|
||
|
|
flush();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (m_buffer.committed()) {
|
||
|
|
flush();
|
||
|
|
}
|
||
|
|
|
||
|
|
mark_header_as_done();
|
||
|
|
}
|
||
|
|
|
||
|
|
public:
|
||
|
|
|
||
|
|
explicit O5mParser(parser_arguments& args) :
|
||
|
|
Parser(args),
|
||
|
|
m_header(),
|
||
|
|
m_buffer(buffer_size),
|
||
|
|
m_input(),
|
||
|
|
m_data(m_input.data()),
|
||
|
|
m_end(m_data) {
|
||
|
|
}
|
||
|
|
|
||
|
|
~O5mParser() noexcept final = default;
|
||
|
|
|
||
|
|
void run() final {
|
||
|
|
osmium::thread::set_thread_name("_osmium_o5m_in");
|
||
|
|
|
||
|
|
decode_header();
|
||
|
|
decode_data();
|
||
|
|
}
|
||
|
|
|
||
|
|
}; // class O5mParser
|
||
|
|
|
||
|
|
// we want the register_parser() function to run, setting
|
||
|
|
// the variable is only a side-effect, it will never be used
|
||
|
|
const bool registered_o5m_parser = ParserFactory::instance().register_parser(
|
||
|
|
file_format::o5m,
|
||
|
|
[](parser_arguments& args) {
|
||
|
|
return std::unique_ptr<Parser>(new O5mParser{args});
|
||
|
|
});
|
||
|
|
|
||
|
|
// dummy function to silence the unused variable warning from above
|
||
|
|
inline bool get_registered_o5m_parser() noexcept {
|
||
|
|
return registered_o5m_parser;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
|
||
|
|
} // namespace io
|
||
|
|
|
||
|
|
} // namespace osmium
|
||
|
|
|
||
|
|
#endif // OSMIUM_IO_DETAIL_O5M_INPUT_FORMAT_HPP
|