bool storage::write_data_block(core::tools::binary_stream& _data, int64_t& _offset)
{
if (!active_file_stream_)
{
assert(!"file stream not opened");
return false;
}
_offset = active_file_stream_->tellp();
uint32_t data_size = _data.available();
active_file_stream_->write((const char*) &data_size, sizeof(data_size));
active_file_stream_->write((const char*) &data_size, sizeof(data_size));
if (data_size)
active_file_stream_->write((const char*) _data.read(data_size), data_size);
active_file_stream_->write((const char*) &data_size, sizeof(data_size));
active_file_stream_->write((const char*) &data_size, sizeof(data_size));
return true;
}
bool storage::read_data_block(int64_t _offset, core::tools::binary_stream& _data)
{
if (_offset != -1)
active_file_stream_->seekp(_offset);
if (active_file_stream_->peek() == EOF)
{
last_error_ = archive::error::end_of_file;
return false;
}
uint32_t sz1 = 0, sz2 = 0;
active_file_stream_->read((char*) &sz1, sizeof(sz1));
if (!active_file_stream_->good())
return false;
active_file_stream_->read((char*) &sz2, sizeof(sz2));
if (!active_file_stream_->good())
return false;
if (sz1 != sz2 || sz1 > max_data_block_size)
return false;
if (sz1 != 0)
{
active_file_stream_->read(_data.alloc_buffer(sz1), sz1);
if (!active_file_stream_->good())
return false;
}
uint32_t sz3 = 0, sz4 = 0;
active_file_stream_->read((char*) &sz3, sizeof(sz3));
if (!active_file_stream_->good())
return false;
active_file_stream_->read((char*) &sz4, sizeof(sz4));
if (!active_file_stream_->good())
return false;
if (sz1 != sz3 || sz1 != sz4)
return false;
return true;
}
bool core::archive::image_cache::unserialize_block(core::tools::binary_stream& _stream, images_map_t& _images) const
{
while (_stream.available())
{
core::tools::tlvpack block;
if (!block.unserialize(_stream))
return false;
for (auto item = block.get_first(); item; item = block.get_next())
{
image_data img;
auto stream = item->get_value<core::tools::binary_stream>();
if (!img.unserialize(stream))
return false;
const auto id = img.get_msgid();
_images.emplace(id, std::move(img));
}
}
return true;
}