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/* Copyright (C) Teemu Suutari */
#ifndef OUTPUTSTREAM_HPP
#define OUTPUTSTREAM_HPP
#include <cstddef>
#include <cstdint>
#include "common/Buffer.hpp"
namespace ancient::internal
{
class ForwardOutputStreamBase
{
public:
ForwardOutputStreamBase(Buffer &buffer,size_t startOffset);
virtual ~ForwardOutputStreamBase() noexcept=default;
void writeByte(uint8_t value);
uint8_t copy(size_t distance,size_t count);
uint8_t copy(size_t distance,size_t count,const Buffer &prevBuffer);
uint8_t copy(size_t distance,size_t count,uint8_t defaultChar);
uint8_t *history(size_t distance);
const uint8_t *history(size_t distance) const;
void produce(const Buffer &src);
size_t getOffset() const { return _currentOffset; }
protected:
virtual void ensureSize(size_t offset)=0;
Buffer &_buffer;
size_t _startOffset;
size_t _currentOffset;
};
class ForwardOutputStream : public ForwardOutputStreamBase
{
public:
ForwardOutputStream(Buffer &buffer,size_t startOffset,size_t endOffset);
~ForwardOutputStream() noexcept=default;
void reset(size_t startOffset,size_t endOffset);
bool eof() const { return _currentOffset==_endOffset; }
size_t getEndOffset() const { return _endOffset; }
protected:
void ensureSize(size_t offset) final;
private:
size_t _endOffset;
};
class AutoExpandingForwardOutputStream : public ForwardOutputStreamBase
{
public:
AutoExpandingForwardOutputStream(Buffer &buffer);
~AutoExpandingForwardOutputStream() noexcept;
protected:
void ensureSize(size_t offset) final;
private:
static constexpr size_t _advance{65536U};
bool _hasExpanded=false;
};
class BackwardOutputStream
{
public:
BackwardOutputStream(Buffer &buffer,size_t startOffset,size_t endOffset);
~BackwardOutputStream() noexcept=default;
void writeByte(uint8_t value);
uint8_t copy(size_t distance,size_t count);
bool eof() const { return _currentOffset==_startOffset; }
size_t getOffset() const { return _currentOffset; }
private:
Buffer &_buffer;
size_t _startOffset;
size_t _currentOffset;
size_t _endOffset;
};
}
#endif
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