#ifndef BUF_H

#define BUF_H 

/*=========================================================================*\

* Input/Output interface for Lua programs

* LuaSocket toolkit

*

* Line patterns require buffering. Reading one character at a time involves

* too many system calls and is very slow. This module implements the

* LuaSocket interface for input/output on connected objects, as seen by 

* Lua programs. 

*

* Input is buffered. Output is *not* buffered because there was no simple

* way of making sure the buffered output data would ever be sent.

*

* The module is built on top of the I/O abstraction defined in io.h and the

* timeout management is done with the timeout.h interface.

\*=========================================================================*/

#include "lua.h"

#include "io.h"

#include "timeout.h"

/* buffer size in bytes */

#define BUF_SIZE 8192

/* buffer control structure */

typedef struct t_buffer_ {

    double birthday;        /* throttle support info: creation time, */

    size_t sent, received;  /* bytes sent, and bytes received */

    p_io io;                /* IO driver used for this buffer */

    p_timeout tm;           /* timeout management for this buffer */

    size_t first, last;     /* index of first and last bytes of stored data */

    char data[BUF_SIZE];    /* storage space for buffer data */

} t_buffer;

typedef t_buffer *p_buffer;

int buffer_open(lua_State *L);

void buffer_init(p_buffer buf, p_io io, p_timeout tm);

int buffer_meth_send(lua_State *L, p_buffer buf);

int buffer_meth_receive(lua_State *L, p_buffer buf);

int buffer_meth_getstats(lua_State *L, p_buffer buf);

int buffer_meth_setstats(lua_State *L, p_buffer buf);

int buffer_isempty(p_buffer buf);

#endif /* BUF_H */