/usr/include/osmium/input/xml.hpp is in libosmium-dev 0.0~20140910-9a069af-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#define OSMIUM_INPUT_XML_HPP
/*
Copyright 2012 Jochen Topf <jochen@topf.org> and others (see README).
This file is part of Osmium (https://github.com/joto/osmium).
Osmium is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License or (at your option) the GNU
General Public License as published by the Free Software Foundation, either
version 3 of the Licenses, or (at your option) any later version.
Osmium is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU Lesser General Public License and the GNU
General Public License for more details.
You should have received a copy of the Licenses along with Osmium. If not, see
<http://www.gnu.org/licenses/>.
*/
#define OSMIUM_LINK_WITH_LIBS_EXPAT -lexpat
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <sstream>
#include <stdexcept>
#include <string>
#include <expat.h>
#include <osmium/input.hpp>
namespace Osmium {
namespace Input {
/**
* Class for parsing OSM XML files.
*
* Generally you are not supposed to instantiate this class yourself.
* Use the Osmium::Input::read() function instead.
*
* @tparam THandler A handler class (subclass of Osmium::Handler::Base).
*/
template <class THandler>
class XML : public Base<THandler> {
public:
/**
* Instantiate XML Parser.
*
* @param file OSMFile instance.
* @param handler Instance of THandler.
*/
XML(const Osmium::OSMFile& file, THandler& handler) :
Base<THandler>(file, handler),
m_current_object(NULL),
m_context(context_root),
m_last_context(context_root),
m_in_delete_section(false) {
}
void parse() {
XML_Parser parser = XML_ParserCreate(0);
if (!parser) {
throw std::runtime_error("Error creating parser");
}
XML_SetUserData(parser, this);
XML_SetElementHandler(parser, Osmium::Input::XML<THandler>::start_element_wrapper, Osmium::Input::XML<THandler>::end_element_wrapper);
try {
int done;
do {
void* buffer = XML_GetBuffer(parser, c_buffer_size);
if (buffer == 0) {
throw std::runtime_error("out of memory");
}
int result = ::read(this->fd(), buffer, c_buffer_size);
if (result < 0) {
throw std::runtime_error("read error");
}
done = (result == 0);
if (XML_ParseBuffer(parser, result, done) == XML_STATUS_ERROR) {
XML_Error errorCode = XML_GetErrorCode(parser);
long errorLine = XML_GetCurrentLineNumber(parser);
long errorCol = XML_GetCurrentColumnNumber(parser);
const XML_LChar* errorString = XML_ErrorString(errorCode);
std::stringstream errorDesc;
errorDesc << "XML parsing error at line " << errorLine << ":" << errorCol;
errorDesc << ": " << errorString;
throw std::runtime_error(errorDesc.str());
}
} while (!done);
XML_ParserFree(parser);
this->call_after_and_before_on_handler(UNKNOWN);
} catch (Osmium::Handler::StopReading) {
// if a handler says to stop reading, we do
}
this->call_final_on_handler();
}
private:
static const int c_buffer_size = 10240;
Osmium::OSM::Object* m_current_object;
enum context_t {
context_root,
context_top,
context_node,
context_way,
context_relation,
context_in_object
};
context_t m_context;
context_t m_last_context;
/**
* This is used only for change files which contain create, modify,
* and delete sections.
*/
bool m_in_delete_section;
static void XMLCALL start_element_wrapper(void* data, const XML_Char* element, const XML_Char** attrs) {
static_cast<Osmium::Input::XML<THandler> *>(data)->start_element(element, attrs);
}
static void XMLCALL end_element_wrapper(void* data, const XML_Char* element) {
static_cast<Osmium::Input::XML<THandler> *>(data)->end_element(element);
}
void init_object(Osmium::OSM::Object& obj, const XML_Char** attrs) {
if (m_in_delete_section) {
obj.visible(false);
}
m_current_object = &obj;
for (int count = 0; attrs[count]; count += 2) {
if (!strcmp(attrs[count], "lon")) {
if (this->m_node) {
this->m_node->lon(atof(attrs[count+1]));
}
} else if (!strcmp(attrs[count], "lat")) {
if (this->m_node) {
this->m_node->lat(atof(attrs[count+1]));
}
} else {
m_current_object->set_attribute(attrs[count], attrs[count+1]);
}
}
}
void check_tag(const XML_Char* element, const XML_Char** attrs) {
if (!strcmp(element, "tag")) {
const char* key = "";
const char* value = "";
for (int count = 0; attrs[count]; count += 2) {
if (attrs[count][0] == 'k' && attrs[count][1] == 0) {
key = attrs[count+1];
}
if (attrs[count][0] == 'v' && attrs[count][1] == 0) {
value = attrs[count+1];
}
}
m_current_object->tags().add(key, value);
}
}
void start_element(const XML_Char* element, const XML_Char** attrs) {
switch (m_context) {
case context_root:
if (!strcmp(element, "osm") || !strcmp(element, "osmChange")) {
for (int count = 0; attrs[count]; count += 2) {
if (!strcmp(attrs[count], "version")) {
if (strcmp(attrs[count+1], "0.6")) {
throw std::runtime_error("can only read version 0.6 files");
}
} else if (!strcmp(attrs[count], "generator")) {
this->meta().generator(attrs[count+1]);
}
}
}
m_context = context_top;
break;
case context_top:
if (!strcmp(element, "node")) {
this->call_after_and_before_on_handler(NODE);
init_object(this->prepare_node(), attrs);
m_context = context_node;
} else if (!strcmp(element, "way")) {
this->call_after_and_before_on_handler(WAY);
init_object(this->prepare_way(), attrs);
m_context = context_way;
} else if (!strcmp(element, "relation")) {
this->call_after_and_before_on_handler(RELATION);
init_object(this->prepare_relation(), attrs);
m_context = context_relation;
} else if (!strcmp(element, "bounds")) {
Osmium::OSM::Position min;
Osmium::OSM::Position max;
for (int count = 0; attrs[count]; count += 2) {
if (!strcmp(attrs[count], "minlon")) {
min.lon(atof(attrs[count+1]));
} else if (!strcmp(attrs[count], "minlat")) {
min.lat(atof(attrs[count+1]));
} else if (!strcmp(attrs[count], "maxlon")) {
max.lon(atof(attrs[count+1]));
} else if (!strcmp(attrs[count], "maxlat")) {
max.lat(atof(attrs[count+1]));
}
}
this->meta().bounds().extend(min).extend(max);
} else if (!strcmp(element, "delete")) {
m_in_delete_section = true;
}
break;
case context_node:
m_last_context = context_node;
m_context = context_in_object;
check_tag(element, attrs);
break;
case context_way:
m_last_context = context_way;
m_context = context_in_object;
if (!strcmp(element, "nd")) {
for (int count = 0; attrs[count]; count += 2) {
if (!strcmp(attrs[count], "ref")) {
this->m_way->add_node(Osmium::string_to_osm_object_id_t(attrs[count+1]));
}
}
} else {
check_tag(element, attrs);
}
break;
case context_relation:
m_last_context = context_relation;
m_context = context_in_object;
if (!strcmp(element, "member")) {
char type = 'x';
uint64_t ref = 0;
const char* role = "";
for (int count = 0; attrs[count]; count += 2) {
if (!strcmp(attrs[count], "type")) {
type = static_cast<char>(attrs[count+1][0]);
} else if (!strcmp(attrs[count], "ref")) {
ref = Osmium::string_to_osm_object_id_t(attrs[count+1]);
} else if (!strcmp(attrs[count], "role")) {
role = static_cast<const char*>(attrs[count+1]);
}
}
// XXX assert type, ref, role are set
if (m_current_object && this->m_relation) {
this->m_relation->add_member(type, ref, role);
}
} else {
check_tag(element, attrs);
}
break;
case context_in_object:
// fallthrough
default:
assert(false); // should never be here
}
}
void end_element(const XML_Char* element) {
switch (m_context) {
case context_root:
assert(false); // should never be here
break;
case context_top:
if (!strcmp(element, "osm") || !strcmp(element, "osmChange")) {
m_context = context_root;
} else if (!strcmp(element, "delete")) {
m_in_delete_section = false;
}
break;
case context_node:
this->call_node_on_handler();
m_current_object = NULL;
m_context = context_top;
break;
case context_way:
this->call_way_on_handler();
m_current_object = NULL;
m_context = context_top;
break;
case context_relation:
this->call_relation_on_handler();
m_current_object = NULL;
m_context = context_top;
break;
case context_in_object:
m_context = m_last_context;
break;
default:
assert(false); // should never be here
}
}
}; // class XML
} // namespace Input
} // namespace Osmium
#endif // OSMIUM_INPUT_XML_HPP
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