/**
* Read up to n bytes into the string output.
*/
unsigned int IOStack::Read(string *output, unsigned int length) {
unsigned int bytes_remaining = length;
BlockVector::iterator iter = m_blocks.begin();
while (iter != m_blocks.end() && bytes_remaining) {
MemoryBlock *block = *iter;
unsigned int bytes_to_copy = std::min(block->Size(), bytes_remaining);
output->append(reinterpret_cast<char*>(block->Data()), bytes_to_copy);
bytes_remaining -= bytes_to_copy;
if (block->Empty()) {
m_pool->Release(block);
iter = m_blocks.erase(iter);
} else {
iter++;
}
}
return length - bytes_remaining;
}
