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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "input.h"
namespace vbench {
/**
* Concrete utility class used to read input data one byte at a time
* by wrapping a generic Input implementation.
**/
class ByteInput
{
private:
Input &_input;
Memory _data;
size_t _pos;
public:
/**
* Wrap an Input to read one byte at a time.
*
* @param input the underlying Input
**/
ByteInput(Input &input)
: _input(input), _data(), _pos(0) {}
~ByteInput() { _input.evict(_pos); }
/**
* Read the next byte of input.
*
* @return next byte of input, or -1 if no more input is available
**/
int get() {
if (_pos < _data.size) {
return (_data.data[_pos++] & 0xff);
} else {
_data = _input.evict(_pos).obtain();
if ((_pos = 0) < _data.size) {
return (_data.data[_pos++] & 0xff);
}
}
return -1;
}
};
} // namespace vbench
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