| /** |
| * |
| * 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. |
| */ |
| |
| #ifndef LIBMINIFI_INCLUDE_IO_DATASTREAM_H_ |
| #define LIBMINIFI_INCLUDE_IO_DATASTREAM_H_ |
| |
| #include <iostream> |
| #include <cstdint> |
| #include <vector> |
| #include "EndianCheck.h" |
| namespace org { |
| namespace apache { |
| namespace nifi { |
| namespace minifi { |
| namespace io { |
| /** |
| * DataStream defines the mechanism through which |
| * binary data will be written to a sink |
| * |
| * This object is not intended to be thread safe. |
| */ |
| class DataStream { |
| public: |
| |
| DataStream() |
| : readBuffer(0) { |
| |
| } |
| |
| virtual ~DataStream() { |
| |
| } |
| |
| /** |
| * Constructor |
| **/ |
| explicit DataStream(const uint8_t *buf, const uint32_t buflen) |
| : DataStream() { |
| writeData((uint8_t*) buf, buflen); |
| |
| } |
| |
| virtual short initialize() { |
| buffer.clear(); |
| readBuffer = 0; |
| return 0; |
| } |
| |
| virtual void seek(uint64_t offset) { |
| readBuffer += offset; |
| } |
| |
| virtual void closeStream() { |
| |
| } |
| |
| /** |
| * Reads data and places it into buf |
| * @param buf buffer in which we extract data |
| * @param buflen |
| */ |
| virtual int readData(std::vector<uint8_t> &buf, int buflen); |
| /** |
| * Reads data and places it into buf |
| * @param buf buffer in which we extract data |
| * @param buflen |
| */ |
| virtual int readData(uint8_t *buf, int buflen); |
| |
| /** |
| * writes valiue to buffer |
| * @param value value to write |
| * @param size size of value |
| */ |
| virtual int writeData(uint8_t *value, int size); |
| |
| /** |
| * Reads a system word |
| * @param value value to write |
| */ |
| virtual int read(uint64_t &value, bool is_little_endian = EndiannessCheck::IS_LITTLE); |
| |
| /** |
| * Reads a uint32_t |
| * @param value value to write |
| */ |
| virtual int read(uint32_t &value, bool is_little_endian = EndiannessCheck::IS_LITTLE); |
| |
| /** |
| * Reads a system short |
| * @param value value to write |
| */ |
| virtual int read(uint16_t &value, bool is_little_endian = EndiannessCheck::IS_LITTLE); |
| |
| /** |
| * Returns the underlying buffer |
| * @return vector's array |
| **/ |
| const uint8_t *getBuffer() const { |
| return &buffer[0]; |
| } |
| |
| /** |
| * Retrieve size of data stream |
| * @return size of data stream |
| **/ |
| virtual const uint64_t getSize() const { |
| return buffer.size(); |
| } |
| |
| protected: |
| // All serialization related method and internal buf |
| std::vector<uint8_t> buffer; |
| uint32_t readBuffer; |
| }; |
| |
| } /* namespace io */ |
| } /* namespace minifi */ |
| } /* namespace nifi */ |
| } /* namespace apache */ |
| } /* namespace org */ |
| #endif /* LIBMINIFI_INCLUDE_IO_DATASTREAM_H_ */ |