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Fixed stream loading memory leaks in the unlikely case streams have exception mask set, better stream error handling.

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git-svn-id: http://pugixml.googlecode.com/svn/trunk@610 99668b35-9821-0410-8761-19e4c4f06640
This commit is contained in:
arseny.kapoulkine 2010-07-22 05:09:25 +00:00
parent b4a012a4d5
commit 04085a8875
1 changed files with 38 additions and 18 deletions
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56
src/pugixml.cpp
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@ -2968,38 +2968,58 @@ namespace
}
#ifndef PUGIXML_NO_STL
template <typename T> xml_parse_result load_stream_impl(xml_document& doc, std::basic_istream<T, std::char_traits<T> >& stream, unsigned int options, xml_encoding encoding)
struct buffer_holder
{
if (!stream.good()) return make_parse_result(status_io_error);
void* data;
buffer_holder(void* data): data(data)
{
}
~buffer_holder()
{
if (data) global_deallocate(data);
}
void* release()
{
void* result = data;
data = 0;
return result;
}
};
template <typename T> xml_parse_result load_stream_impl(xml_document& doc, std::basic_istream<T>& stream, unsigned int options, xml_encoding encoding)
{
if (stream.fail()) return make_parse_result(status_io_error);
// get length of remaining data in stream
std::streamoff pos = stream.tellg();
typename std::basic_istream<T>::pos_type pos = stream.tellg();
stream.seekg(0, std::ios::end);
std::streamoff length = stream.tellg() - pos;
stream.seekg(pos, std::ios::beg);
stream.seekg(pos);
if (!stream.good() || pos < 0 || length < 0) return make_parse_result(status_io_error);
if (stream.fail() || pos < 0) return make_parse_result(status_io_error);
// read stream data into memory
// guard against huge files
size_t read_length = static_cast<size_t>(length);
T* s = static_cast<T*>(global_allocate((read_length > 0 ? read_length : 1) * sizeof(T)));
if (!s) return make_parse_result(status_out_of_memory);
if (static_cast<std::streamsize>(read_length) != length || length < 0) return make_parse_result(status_out_of_memory);
stream.read(s, static_cast<std::streamsize>(read_length));
// read stream data into memory (guard against stream exceptions with buffer holder)
buffer_holder buffer = global_allocate((read_length > 0 ? read_length : 1) * sizeof(T));
if (!buffer.data) return make_parse_result(status_out_of_memory);
// check for errors
stream.read(static_cast<T*>(buffer.data), static_cast<std::streamsize>(read_length));
// read may set failbit | eofbit in case gcount() is less than read_length (i.e. line ending conversion), so check for other I/O errors
if (stream.bad()) return make_parse_result(status_io_error);
// load data from buffer
size_t actual_length = static_cast<size_t>(stream.gcount());
assert(actual_length <= read_length);
if (read_length > 0 && actual_length == 0)
{
global_deallocate(s);
return make_parse_result(status_io_error);
}
// load data from buffer
return doc.load_buffer_inplace_own(s, actual_length * sizeof(T), options, encoding);
return doc.load_buffer_inplace_own(buffer.release(), actual_length * sizeof(T), options, encoding);
}
#endif
}