/*

** $Id: lzio.h,v 1.15 2003/03/20 16:00:56 roberto Exp $

** Buffered streams

** See Copyright Notice in lua.h

*/





#ifndef lzio_h

#define lzio_h



#include "lua.h"





#define EOZ	(-1)			/* end of stream */



typedef struct Zio ZIO;





#define char2int(c)	cast(int, cast(unsigned char, (c)))



#define zgetc(z)  (((z)->n--)>0 ?  char2int(*(z)->p++) : luaZ_fill(z))



#define zname(z)	((z)->name)



void luaZ_init (ZIO *z, lua_Chunkreader reader, void *data, const char *name);

size_t luaZ_read (ZIO* z, void* b, size_t n);	/* read next n bytes */

int luaZ_lookahead (ZIO *z);







typedef struct Mbuffer {

  char *buffer;

  size_t buffsize;

} Mbuffer;





char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);



#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)



#define luaZ_sizebuffer(buff)	((buff)->buffsize)

#define luaZ_buffer(buff)	((buff)->buffer)



#define luaZ_resizebuffer(L, buff, size) \

	(luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \

	(buff)->buffsize = size)



#define luaZ_freebuffer(L, buff)	luaZ_resizebuffer(L, buff, 0)





/* --------- Private Part ------------------ */



struct Zio {

  size_t n;			/* bytes still unread */

  const char *p;		/* current position in buffer */

  lua_Chunkreader reader;

  void* data;			/* additional data */

  const char *name;

};





int luaZ_fill (ZIO *z);



#endif

