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      1 /*	$NetBSD: lzio.h,v 1.9 2023/04/16 20:46:17 nikita Exp $	*/
      2 
      3 /*
      4 ** Id: lzio.h
      5 ** Buffered streams
      6 ** See Copyright Notice in lua.h
      7 */
      8 
      9 
     10 #ifndef lzio_h
     11 #define lzio_h
     12 
     13 #include "lua.h"
     14 
     15 #include "lmem.h"
     16 
     17 
     18 #define EOZ	(-1)			/* end of stream */
     19 
     20 typedef struct Zio ZIO;
     21 
     22 #define zgetc(z)  (((z)->n--)>0 ?  cast_uchar(*(z)->p++) : luaZ_fill(z))
     23 
     24 
     25 typedef struct Mbuffer {
     26   char *buffer;
     27   size_t n;
     28   size_t buffsize;
     29 } Mbuffer;
     30 
     31 #define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
     32 
     33 #define luaZ_buffer(buff)	((buff)->buffer)
     34 #define luaZ_sizebuffer(buff)	((buff)->buffsize)
     35 #define luaZ_bufflen(buff)	((buff)->n)
     36 
     37 #define luaZ_buffremove(buff,i)	((buff)->n -= (i))
     38 #define luaZ_resetbuffer(buff) ((buff)->n = 0)
     39 
     40 
     41 #define luaZ_resizebuffer(L, buff, size) \
     42 	((buff)->buffer = luaM_reallocvchar(L, (buff)->buffer, \
     43 				(buff)->buffsize, size), \
     44 	(buff)->buffsize = size)
     45 
     46 #define luaZ_freebuffer(L, buff)	luaZ_resizebuffer(L, buff, 0)
     47 
     48 
     49 LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
     50                                         void *data);
     51 LUAI_FUNC size_t luaZ_read (ZIO* z, void *b, size_t n);	/* read next n bytes */
     52 
     53 
     54 
     55 /* --------- Private Part ------------------ */
     56 
     57 struct Zio {
     58   size_t n;			/* bytes still unread */
     59   const char *p;		/* current position in buffer */
     60   lua_Reader reader;		/* reader function */
     61   void *data;			/* additional data */
     62   lua_State *L;			/* Lua state (for reader) */
     63 };
     64 
     65 
     66 LUAI_FUNC int luaZ_fill (ZIO *z);
     67 
     68 #endif
     69