lzio.h (4.0.1)

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/*
** $Id: lzio.h,v 1.7 2000/10/20 16:36:32 roberto Exp $
** Buffered streams
** See Copyright Notice in lua.h
*/


#ifndef lzio_h
#define lzio_h

#include <stdio.h>



/* For Lua only */
#define zFopen  luaZ_Fopen
#define zsopen  luaZ_sopen
#define zmopen  luaZ_mopen
#define zread   luaZ_read

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

typedef struct zio ZIO;

ZIO* zFopen (ZIO* z, FILE* f, const char *name);        /* open FILEs */
ZIO* zsopen (ZIO* z, const char* s, const char *name);  /* string */
ZIO* zmopen (ZIO* z, const char* b, size_t size, const char *name); /* memory */

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

#define zgetc(z)        (((z)->n--)>0 ? ((int)*(z)->p++): (z)->filbuf(z))
#define zungetc(z)      (++(z)->n,--(z)->p)
#define zname(z)        ((z)->name)



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

#ifndef ZBSIZE
#define ZBSIZE  256                     /* buffer size */
#endif

struct zio {
  size_t n;                             /* bytes still unread */
  const unsigned char* p;               /* current position in buffer */
  int (*filbuf)(ZIO* z);
  void* u;                              /* additional data */
  const char *name;
  unsigned char buffer[ZBSIZE];         /* buffer */
};


#endif