173   cur_puff_ = std::next(puffs_.begin(), next_puff_idx);  in Seek()
176   if (offset < cur_puff_->offset) {  in Seek()
179     auto back_track_bytes = cur_puff_->offset - puff_pos_;  in Seek()
181     if (cur_puff_ != puffs_.begin()) {  in Seek()
189     puff_pos_ = cur_puff_->offset;  in Seek()
208   if (cur_puff_ == puffs_.end()) {  in Read()
215     if (puff_pos_ < cur_puff_->offset) {  in Read()
255       TEST_AND_RETURN_FALSE(puff_pos_ <= cur_puff_->offset);  in Read()
267           (length - bytes_read >= cur_puff_->length);  in Read()
269       auto cur_puff_idx = std::distance(puffs_.begin(), cur_puff_);  in Read()
271           !GetPuffCache(cur_puff_idx, cur_puff_->length, &puff_buffer_)) {  in Read()
282                                      cur_puff_->length);  in Read()
292         TEST_AND_RETURN_FALSE(cur_puff_->length == puff_writer.Size());  in Read()
299           std::min(length - bytes_read, cur_puff_->length - skip_bytes_);  in Read()
309       if (puff_pos_ + skip_bytes_ == cur_puff_->offset + cur_puff_->length) {  in Read()
313         cur_puff_++;  in Read()
315         if (cur_puff_ == puffs_.end()) {  in Read()
360         TEST_AND_RETURN_FALSE(puff_pos_ == cur_puff_->offset);  in Write()
364                                cur_puff_->length + extra_byte_ - skip_bytes_);  in Write()
370       if (skip_bytes_ == cur_puff_->length + extra_byte_) {  in Write()
378         BufferPuffReader puff_reader(puff_buffer_->data(), cur_puff_->length);  in Write()
392               puff_buffer_->data()[cur_puff_->length] << (deflate_bit_pos_ & 7);  in Write()
410         cur_puff_++;  in Write()
412         if (cur_puff_ == puffs_.end()) {  in Write()