IOBuf IOBuf::cloneCoalescedAsValue() const {
if (!isChained()) {
return cloneOneAsValue();
}
// Coalesce into newBuf
const uint64_t newLength = computeChainDataLength();
const uint64_t newHeadroom = headroom();
const uint64_t newTailroom = prev()->tailroom();
const uint64_t newCapacity = newLength + newHeadroom + newTailroom;
IOBuf newBuf{CREATE, newCapacity};
newBuf.advance(newHeadroom);
auto current = this;
do {
if (current->length() > 0) {
DCHECK_NOTNULL(current->data());
DCHECK_LE(current->length(), newBuf.tailroom());
memcpy(newBuf.writableTail(), current->data(), current->length());
newBuf.append(current->length());
}
current = current->next();
} while (current != this);
DCHECK_EQ(newLength, newBuf.length());
DCHECK_EQ(newHeadroom, newBuf.headroom());
DCHECK_LE(newTailroom, newBuf.tailroom());
return newBuf;
}
IOBuf IOBuf::cloneAsValue() const {
auto tmp = cloneOneAsValue();
for (IOBuf* current = next_; current != this; current = current->next_) {
tmp.prependChain(current->cloneOne());
}
return tmp;
}
unique_ptr<IOBuf> IOBuf::cloneOne() const {
return make_unique<IOBuf>(cloneOneAsValue());
}