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/**
* 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 ORC_INPUTSTREAM_HH
#define ORC_INPUTSTREAM_HH
#include "Adaptor.hh"
#include "orc/OrcFile.hh"
#include "wrap/zero-copy-stream-wrapper.h"
#include <fstream>
#include <iostream>
#include <list>
#include <sstream>
#include <vector>
namespace orc {
void printBuffer(std::ostream& out, const char* buffer, uint64_t length);
class PositionProvider {
private:
std::list<uint64_t>::const_iterator position_;
public:
PositionProvider(const std::list<uint64_t>& positions);
uint64_t next();
uint64_t current();
};
/**
* A subclass of Google's ZeroCopyInputStream that supports seek.
* By extending Google's class, we get the ability to pass it directly
* to the protobuf readers.
*/
class SeekableInputStream : public google::protobuf::io::ZeroCopyInputStream {
public:
~SeekableInputStream() override;
virtual void seek(PositionProvider& position) = 0;
virtual std::string getName() const = 0;
};
/**
* Create a seekable input stream based on a memory range.
*/
class SeekableArrayInputStream : public SeekableInputStream {
private:
const char* data_;
uint64_t length_;
uint64_t position_;
uint64_t blockSize_;
public:
SeekableArrayInputStream(const unsigned char* list, uint64_t length, uint64_t blockSize = 0);
SeekableArrayInputStream(const char* list, uint64_t length, uint64_t blockSize = 0);
virtual ~SeekableArrayInputStream() override;
virtual bool Next(const void** data, int* size) override;
virtual void BackUp(int count) override;
virtual bool Skip(int count) override;
virtual int64_t ByteCount() const override;
virtual void seek(PositionProvider& position) override;
virtual std::string getName() const override;
};
/**
* Create a seekable input stream based on an input stream.
*/
class SeekableFileInputStream : public SeekableInputStream {
private:
MemoryPool& pool_;
InputStream* const input_;
const uint64_t start_;
const uint64_t length_;
const uint64_t blockSize_;
std::unique_ptr<DataBuffer<char> > buffer_;
uint64_t position_;
uint64_t pushBack_;
public:
SeekableFileInputStream(InputStream* input, uint64_t offset, uint64_t byteCount,
MemoryPool& pool, uint64_t blockSize = 0);
virtual ~SeekableFileInputStream() override;
virtual bool Next(const void** data, int* size) override;
virtual void BackUp(int count) override;
virtual bool Skip(int count) override;
virtual int64_t ByteCount() const override;
virtual void seek(PositionProvider& position) override;
virtual std::string getName() const override;
};
} // namespace orc
#endif // ORC_INPUTSTREAM_HH
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