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/*
* zio.h
* a generic input stream interface
* $Id: zio.h,v 1.3 1997/06/18 21:39:56 roberto Exp roberto $
*/
#ifndef zio_h
#define zio_h
#include <stdio.h>
/* For Lua only */
#define zFopen luaZ_Fopen
#define zfopen luaZ_fopen
#define zpopen luaZ_popen
#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); /* open FILEs */
ZIO* zfopen(ZIO* z, char* s, char* m); /* file by name */
ZIO* zpopen(ZIO* z, char* s, char* m); /* pipe */
ZIO* zsopen(ZIO* z, char* s); /* string */
ZIO* zmopen(ZIO* z, char* b, int size); /* memory */
int zread(ZIO* z, void* b, int 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 zclose(z) (*(z)->close)(z)
/* --------- Private Part ------------------ */
#define ZBSIZE 256 /* buffer size */
struct zio {
int n; /* bytes still unread */
unsigned char* p; /* current position in buffer */
int (*filbuf)(ZIO* z);
int (*close)(ZIO* z);
void* u; /* additional data */
unsigned char buffer[ZBSIZE]; /* buffer */
};
#endif
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