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// Copyright 2006 Ben Hutchings <ben@decadent.org.uk>.
// See the file "COPYING" for licence details.
#include <cerrno>
#include <cstring>
#include <sstream>
#include <unistd.h>
#include <fcntl.h>
#include <expat.h>
#include <glibmm/fileutils.h>
#include <glibmm/miscutils.h>
#include "auto_fd.hpp"
#include "auto_handle.hpp"
#include "vob_list.hpp"
namespace
{
struct xml_parser_closer
{
void operator()(XML_Parser parser) const
{
if (parser)
XML_ParserFree(parser);
}
};
struct xml_parser_factory
{
XML_Parser operator()() const
{
return NULL;
}
};
typedef auto_handle<XML_Parser, xml_parser_closer, xml_parser_factory>
auto_xml_parser;
struct parse_context
{
parse_context(XML_Parser parser,
const std::string & list_path,
vob_list & list)
: parser(parser),
list_path(list_path),
base_path(Glib::path_get_dirname(list_path)),
list(list),
level(0)
{}
XML_Parser parser;
const std::string & list_path;
std::string base_path;
vob_list & list;
std::auto_ptr<xml_error> parse_error;
unsigned level;
};
void start_element_handler(void * user_data,
const char * name,
const char ** attributes)
{
parse_context & context = *static_cast<parse_context *>(user_data);
if (context.level == 0 && std::strcmp(name, "vob-list") == 0)
{
// We don't expect (and will ignore) any attributes.
}
else if (context.level == 1 && std::strcmp(name, "vob") == 0)
{
vob_ref ref;
while (attributes[0] != NULL)
{
if (std::strcmp(attributes[0], "file") == 0)
{
ref.file = attributes[1];
if (!Glib::path_is_absolute(ref.file))
ref.file = Glib::build_filename(context.base_path,
ref.file);
}
else if (std::strcmp(attributes[0], "chapters") == 0)
{
ref.chapters = attributes[1];
}
else if (std::strcmp(attributes[0], "pause") == 0)
{
ref.pause = attributes[1];
}
attributes += 2;
}
if (ref.file.empty())
{
context.parse_error.reset(
new xml_error(
context.list_path,
XML_GetCurrentLineNumber(context.parser),
"<vob> element missing file attribute"));
}
else
{
context.list.push_back(ref);
}
}
else // not root <vob-list> or child <vob>
{
context.parse_error.reset(
new xml_error(
context.list_path,
XML_GetCurrentLineNumber(context.parser),
std::string("unexpected element: <").append(name)
.append(">")));
}
++context.level;
}
void end_element_handler(void * user_data,
const char * /*name*/)
{
parse_context & context = *static_cast<parse_context *>(user_data);
--context.level;
}
}
vob_list read_vob_list(const std::string & path)
{
vob_list result;
auto_fd fd(open(path.c_str(), O_RDONLY, 0));
if (fd.get() < 0)
// FIXME: look up proper error code
throw Glib::FileError(Glib::FileError::FAILED,
std::strerror(errno));
auto_xml_parser parser(XML_ParserCreate(NULL));
if (parser.get() == NULL)
throw std::bad_alloc(); // any other reason?
parse_context context(parser.get(), path, result);
XML_SetUserData(parser.get(), &context);
XML_SetStartElementHandler(parser.get(), start_element_handler);
XML_SetEndElementHandler(parser.get(), end_element_handler);
for (;;)
{
static const int buffer_size = 1024;
void * buffer = XML_GetBuffer(parser.get(), buffer_size);
if (buffer == NULL)
throw std::bad_alloc();
int read_size = read(fd.get(), buffer, buffer_size);
if (read_size < 0)
// FIXME: look up proper error code
throw Glib::FileError(Glib::FileError::FAILED,
std::strerror(errno));
bool is_final = read_size < buffer_size;
if (XML_ParseBuffer(parser.get(), read_size, is_final)
== XML_STATUS_ERROR)
throw xml_error(path,
XML_GetCurrentLineNumber(parser.get()),
XML_ErrorString(XML_GetErrorCode(parser.get())));
if (context.parse_error.get())
throw *context.parse_error;
if (is_final)
break;
}
return result;
}
namespace
{
std::string make_xml_error_message(const std::string & path, int line,
const std::string & message)
{
std::ostringstream os;
os << path << ":" << line << ": " << message;
return os.str();
}
}
xml_error::xml_error(const std::string & path, int line,
const std::string & message)
: std::runtime_error(make_xml_error_message(path, line, message))
{}
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