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()); }