File indexing completed on 2025-04-27 10:01:34

 /*
     SPDX-FileCopyrightText: 2020 Volker Krause <vkrause@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "OsmPbfParser.h"
 
 #ifdef HAVE_PROTOBUF
 #include "fileformat.pb.h"
 #include "osmformat.pb.h"
 #endif
 
 #include <QDebug>
 #include <QtEndian>
 
 #include <zlib.h>
 
 #include <cstdint>
 #include <cstring>
 
 using namespace Marble;
 
 void OsmPbfParser::parse(const uint8_t *data, std::size_t len)
 {
 #ifdef HAVE_PROTOBUF
     const uint8_t *it = data;
     const uint8_t *end = data + len;
     while (parseBlob(it, end));
 #endif
 }
 
 #ifdef HAVE_PROTOBUF
 bool OsmPbfParser::parseBlob(const uint8_t *&it, const uint8_t *end)
 {
     if (std::distance(it, end) < (int)sizeof(int32_t)) {
         return false;
     }
     int32_t blobHeaderSize = 0;
     std::memcpy(&blobHeaderSize, it, sizeof(int32_t));
     blobHeaderSize = qFromBigEndian(blobHeaderSize);
     it += sizeof(int32_t);
 
     if (blobHeaderSize < 0 || std::distance(it, end) < blobHeaderSize) {
         return false;
     }
 
     OSMPBF::BlobHeader blobHeader;
     if (!blobHeader.ParseFromArray(it, blobHeaderSize)) {
         return false;
     }
     it += blobHeaderSize;
 
     OSMPBF::Blob blob;
     if (std::distance(it, end) < blobHeader.datasize() || !blob.ParseFromArray(it, blobHeader.datasize())) {
         return false;
     }
 
     const uint8_t *dataBegin = nullptr;
     if (blob.has_raw()) {
         dataBegin = reinterpret_cast<const uint8_t*>(blob.raw().data());
     } else if (blob.has_zlib_data()) {
         m_zlibBuffer.resize(blob.raw_size());
         z_stream zStream;
         zStream.next_in = (uint8_t*)blob.zlib_data().data();
         zStream.avail_in = blob.zlib_data().size();
         zStream.next_out = (uint8_t*)m_zlibBuffer.data();
         zStream.avail_out = blob.raw_size();
         zStream.zalloc = nullptr;
         zStream.zfree = nullptr;
         zStream.opaque = nullptr;
         auto result = inflateInit(&zStream);
         if (result != Z_OK) {
             return false;
         }
         result = inflate(&zStream, Z_FINISH);
         if (result != Z_STREAM_END) {
             return false;
         }
         result = inflateEnd( &zStream );
         dataBegin = reinterpret_cast<const uint8_t*>(m_zlibBuffer.constData());
     } else {
         return false;
     }
     if (std::strcmp(blobHeader.type().c_str(), "OSMData") == 0) {
         parsePrimitiveBlock(dataBegin, blob.raw_size());
     }
 
     m_zlibBuffer.clear();
     it += blobHeader.datasize();
     return true;
 }
 
 void OsmPbfParser::parsePrimitiveBlock(const uint8_t *data, std::size_t len)
 {
     OSMPBF::PrimitiveBlock block;
     if (!block.ParseFromArray(data, len)) {
         return;
     }
 
     for (int i = 0; i < block.primitivegroup_size(); ++i) {
         const auto &group = block.primitivegroup(i);
 
         if (group.nodes_size()) {
             qWarning() << "non-dense nodes - not implemented yet!";
         } else if (group.has_dense()) {
             parseDenseNodes(block, group);
         } else if (group.ways_size()) {
             parseWays(block, group);
         } else if (group.relations_size()) {
             parseRelations(block, group);
         }
     }
 }
 
 void OsmPbfParser::parseDenseNodes(const OSMPBF::PrimitiveBlock &block, const OSMPBF::PrimitiveGroup &group)
 {
     int64_t idDelta = 0;
     int64_t latDelta = 0;
     int64_t lonDelta = 0;
     int tagIdx = 0;
 
     const auto dense = group.dense();
     for (int i = 0; i < dense.id_size(); ++i) {
         idDelta += dense.id(i);
         latDelta += dense.lat(i);
         lonDelta += dense.lon(i);
 
         auto &node = m_nodes[idDelta];
         node.osmData().setId(idDelta);
         node.setCoordinates(GeoDataCoordinates(lonDelta * 1.0e-7, latDelta * 1.0e-7, 0.0, GeoDataCoordinates::Degree));
 
         while (tagIdx < dense.keys_vals_size()) {
             const auto keyIdx = dense.keys_vals(tagIdx++);
             if (keyIdx == 0) {
                 break;
             }
             const auto valIdx = dense.keys_vals(tagIdx++);
             const QString keyString = *m_stringPool.insert(QString::fromUtf8(block.stringtable().s(keyIdx).data()));
             const QString valueString = *m_stringPool.insert(QString::fromUtf8(block.stringtable().s(valIdx).data()));
             node.osmData().addTag(keyString, valueString);
         }
     }
 }
 
 void OsmPbfParser::parseWays(const OSMPBF::PrimitiveBlock &block, const OSMPBF::PrimitiveGroup &group)
 {
     for (int i = 0; i < group.ways_size(); ++i) {
         const auto &w = group.ways(i);
         auto &way = m_ways[w.id()];
         way.osmData().setId(w.id());
 
         int64_t idDelta = 0;
         for (int j = 0; j < w.refs_size(); ++j) {
             idDelta += w.refs(j);
             way.addReference(idDelta);
         }
 
         for (int j = 0; j < w.keys_size(); ++j) {
             const QString keyString = *m_stringPool.insert(QString::fromUtf8(block.stringtable().s(w.keys(j)).data()));
             const QString valueString = *m_stringPool.insert(QString::fromUtf8(block.stringtable().s(w.vals(j)).data()));
             way.osmData().addTag(keyString, valueString);
         }
     }
 }
 
 void OsmPbfParser::parseRelations(const OSMPBF::PrimitiveBlock &block, const OSMPBF::PrimitiveGroup &group)
 {
     for (int i = 0; i < group.relations_size(); ++i) {
         const auto &r = group.relations(i);
 
         auto &rel = m_relations[r.id()];
         rel.osmData().setId(r.id());
 
         int64_t idDelta = 0;
         for (int j = 0; j < r.memids_size(); ++j) {
             idDelta += r.memids(j);
             const QString role = *m_stringPool.insert(QString::fromUtf8(block.stringtable().s(r.roles_sid(j)).data()));
             QString typeName;
             const auto type = r.types(j);
             switch (type) {
                 case OSMPBF::Relation_MemberType_NODE: typeName = QStringLiteral("node"); break;
                 case OSMPBF::Relation_MemberType_WAY:  typeName = QStringLiteral("way"); break;
                 case OSMPBF::Relation_MemberType_RELATION: typeName = QStringLiteral("relation"); break;
             }
             rel.addMember(idDelta, role, typeName);
         }
 
         for (int j = 0; j < r.keys_size(); ++j) {
             const QString keyString = *m_stringPool.insert(QString::fromUtf8(block.stringtable().s(r.keys(j)).data()));
             const QString valueString = *m_stringPool.insert(QString::fromUtf8(block.stringtable().s(r.vals(j)).data()));
             rel.osmData().addTag(keyString, valueString);
         }
     }
 }
 #endif