explicit Builder(osmium::memory::Buffer& buffer, Builder* parent, osmium::memory::item_size_type size) :
m_buffer(buffer),
m_parent(parent),
m_item_offset(buffer.written()) {
m_buffer.reserve_space(size);
assert(buffer.is_aligned());
if (m_parent) {
m_parent->add_size(size);
}
}
/**
* Add padding to buffer (if needed) to align data properly.
*
* This calculates how many padding bytes are needed and adds
* as many zero bytes to the buffer. It also adds this number
* to the size of the current item (if the "self" param is
* true) and recursively to all the parent items.
*
* @param self If true add number of padding bytes to size
* of current item. Size is always added to
* parent item (if any).
*
*/
void add_padding(bool self = false) {
const auto padding = osmium::memory::align_bytes - (size() % osmium::memory::align_bytes);
if (padding != osmium::memory::align_bytes) {
std::fill_n(m_buffer.reserve_space(padding), padding, 0);
if (self) {
add_size(padding);
} else if (m_parent) {
m_parent->add_size(padding);
assert(m_parent->size() % osmium::memory::align_bytes == 0);
}
}
}
void add_size(uint32_t size) {
item().add_size(size);
if (m_parent) {
m_parent->add_size(size);
}
}
