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/*

* @Author : mark

* @Date : 2020-06-26

* @copyleft Apache 2.0

*/

#ifndef BUFFER_H

#define BUFFER_H

#include <cstring> //perror

#include <iostream>

#include <string>

#include <unistd.h> // write

#include <sys/uio.h> //readv

#include <vector> //readv

#include <atomic>

#include <assert.h>

class Buffer

{

public:

Buffer(int initBuffSize = 1024);

~Buffer() = default;

size_t WritableBytes() const;

size_t ReadableBytes() const;

size_t PrependableBytes() const;

const char *Peek() const;

void EnsureWriteable(size_t len);

void HasWritten(size_t len);

void Retrieve(size_t len);

void RetrieveUntil(const char *end);

void RetrieveAll();

std::string RetrieveAllToStr();

const char *BeginWriteConst() const;

char *BeginWrite();

// 写入

void Append(const std::string &str);

void Append(const char *str, size_t len);

void Append(const void *data, size_t len);

void Append(const Buffer &buff);

// 读取

ssize_t ReadFd(int fd, int *Errno);

ssize_t WriteFd(int fd, int *Errno);

ssize_t Read(int n, std::string &ret);

private:

char *

BeginPtr_();

const char *BeginPtr_() const;

void MakeSpace_(size_t len);

std::vector<char> buffer_;

std::atomic<std::size_t> readPos_;

std::atomic<std::size_t> writePos_;

};

#endif // BUFFER_H