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** $Id: lzio.h,v 2007/12/27 13:02:25 roberto Exp $
** Buffered streams
** See Copyright Notice in lua.h

#ifndef lzio_h
#define lzio_h

#include "lua.h"

#include "lmem.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))

typedef struct Mbuffer {
  char *buffer;
  size_t n;
  size_t buffsize;
} Mbuffer;

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

#define luaZ_buffer(buff)     ((buff)->buffer)
#define luaZ_sizebuffer(buff) ((buff)->buffsize)
#define luaZ_bufflen(buff)    ((buff)->n)

#define luaZ_resetbuffer(buff) ((buff)->n = 0)

#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)

LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
                                        void *data);
LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n);     /* read next n bytes */
LUAI_FUNC int luaZ_lookahead (ZIO *z);

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

struct Zio {
  size_t n;             /* bytes still unread */
  const char *p;        /* current position in buffer */
  lua_Reader reader;
  void* data;                 /* additional data */
  lua_State *L;               /* Lua state (for reader) */

LUAI_FUNC int luaZ_fill (ZIO *z);


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