bool McAsciiParserBase::readValue(folly::IOBuf& buffer, folly::IOBuf& to) {
if (remainingIOBufLength_) {
// Copy IOBuf for part of (or whole) value.
size_t offset = p_ - reinterpret_cast<const char*>(buffer.data()) + 1;
size_t toUse = std::min(buffer.length() - offset, remainingIOBufLength_);
buffer.cloneOneInto(to);
// Adjust buffer pointers.
to.trimStart(offset);
to.trimEnd(buffer.length() - offset - toUse);
remainingIOBufLength_ -= toUse;
// Move the state machine to the proper character.
p_ += toUse;
// Now if we don't have enough data, we need to preallocate second piece
// for remaining buffer and signal partial read.
if (remainingIOBufLength_) {
auto secondPiece = folly::IOBuf::createCombined(remainingIOBufLength_);
currentIOBuf_ = secondPiece.get();
to.appendChain(std::move(secondPiece));
return false;
}
}
return true;
}
McAsciiParserBase::State McClientAsciiParser::consume(folly::IOBuf& buffer) {
assert(state_ == State::PARTIAL && !hasReadBuffer());
p_ = reinterpret_cast<const char*>(buffer.data());
pe_ = p_ + buffer.length();
(this->*consumer_)(buffer);
if (savedCs_ == errorCs_) {
handleError(buffer);
}
buffer.trimStart(p_ - reinterpret_cast<const char*>(buffer.data()));
return state_;
}