thin-provisioning-tools/base/xml_utils.cc

90 lines
2.1 KiB
C++
Raw Normal View History

#include "xml_utils.h"
#include "persistent-data/file_utils.h"
#include <fstream>
#include <iostream>
using namespace xml_utils;
//----------------------------------------------------------------
void
xml_parser::parse(std::string const &backup_file, bool quiet)
{
persistent_data::check_file_exists(backup_file);
ifstream in(backup_file.c_str(), ifstream::in);
std::unique_ptr<base::progress_monitor> monitor = create_monitor(quiet);
size_t total = 0;
size_t input_length = get_file_length(backup_file);
XML_Error error_code = XML_ERROR_NONE;
while (!in.eof() && error_code == XML_ERROR_NONE) {
char buffer[4096];
in.read(buffer, sizeof(buffer));
size_t len = in.gcount();
int done = in.eof();
// Do not throw while normally aborted by element handlers
if (!XML_Parse(parser_, buffer, len, done) &&
(error_code = XML_GetErrorCode(parser_)) != XML_ERROR_ABORTED) {
ostringstream out;
out << "Parse error at line "
<< XML_GetCurrentLineNumber(parser_)
<< ":\n"
<< XML_ErrorString(XML_GetErrorCode(parser_))
<< endl;
throw runtime_error(out.str());
}
total += len;
monitor->update_percent(total * 100 / input_length);
}
}
size_t
xml_parser::get_file_length(string const &file) const
{
struct stat info;
int r;
r = ::stat(file.c_str(), &info);
if (r)
throw runtime_error("Couldn't stat backup path");
return info.st_size;
}
unique_ptr<base::progress_monitor>
xml_parser::create_monitor(bool quiet)
{
if (!quiet && isatty(fileno(stdout)))
return base::create_progress_bar("Restoring");
else
return base::create_quiet_progress_monitor();
}
//----------------------------------------------------------------
void
xml_utils::build_attributes(attributes &a, char const **attr)
{
while (*attr) {
char const *key = *attr;
attr++;
if (!*attr) {
ostringstream out;
out << "No value given for xml attribute: " << key;
throw runtime_error(out.str());
}
char const *value = *attr;
a.insert(make_pair(string(key), string(value)));
attr++;
}
}
//----------------------------------------------------------------