| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| #include "kudu/util/pb_util-internal.h" |
| |
| #include <ostream> |
| |
| namespace kudu { |
| namespace pb_util { |
| namespace internal { |
| |
| //////////////////////////////////////////// |
| // SequentialFileFileInputStream |
| //////////////////////////////////////////// |
| |
| bool SequentialFileFileInputStream::Next(const void **data, int *size) { |
| if (PREDICT_FALSE(!status_.ok())) { |
| LOG(WARNING) << "Already failed on a previous read: " << status_.ToString(); |
| return false; |
| } |
| |
| size_t available = (buffer_used_ - buffer_offset_); |
| if (available > 0) { |
| *data = buffer_.get() + buffer_offset_; |
| *size = available; |
| buffer_offset_ += available; |
| total_read_ += available; |
| return true; |
| } |
| |
| Slice result(buffer_.get(), buffer_size_); |
| status_ = rfile_->Read(&result); |
| if (!status_.ok()) { |
| LOG(WARNING) << "Read at " << buffer_offset_ << " failed: " << status_.ToString(); |
| return false; |
| } |
| |
| buffer_used_ = result.size(); |
| buffer_offset_ = buffer_used_; |
| total_read_ += buffer_used_; |
| *data = buffer_.get(); |
| *size = buffer_used_; |
| return buffer_used_ > 0; |
| } |
| |
| bool SequentialFileFileInputStream::Skip(int count) { |
| CHECK_GT(count, 0); |
| int avail = (buffer_used_ - buffer_offset_); |
| if (avail > count) { |
| buffer_offset_ += count; |
| total_read_ += count; |
| } else { |
| buffer_used_ = 0; |
| buffer_offset_ = 0; |
| status_ = rfile_->Skip(count - avail); |
| total_read_ += count - avail; |
| } |
| return status_.ok(); |
| } |
| |
| //////////////////////////////////////////// |
| // WritableFileOutputStream |
| //////////////////////////////////////////// |
| |
| bool WritableFileOutputStream::Next(void **data, int *size) { |
| if (PREDICT_FALSE(!status_.ok())) { |
| LOG(WARNING) << "Already failed on a previous write: " << status_.ToString(); |
| return false; |
| } |
| |
| size_t available = (buffer_size_ - buffer_offset_); |
| if (available > 0) { |
| *data = buffer_.get() + buffer_offset_; |
| *size = available; |
| buffer_offset_ += available; |
| return true; |
| } |
| |
| if (!Flush()) { |
| return false; |
| } |
| |
| buffer_offset_ = buffer_size_; |
| *data = buffer_.get(); |
| *size = buffer_size_; |
| return true; |
| } |
| |
| } // namespace internal |
| } // namespace pb_util |
| } // namespace kudu |