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      1 /*
      2 ** $Id: lzio.h,v 1.26 2011/07/15 12:48:03 roberto Exp $
      3 ** Buffered streams
      4 ** See Copyright Notice in lua.h
      5 */
      6 
      7 
      8 #ifndef lzio_h
      9 #define lzio_h
     10 
     11 #include "lua.h"
     12 
     13 #include "lmem.h"
     14 
     15 
     16 #define EOZ	(-1)			/* end of stream */
     17 
     18 typedef struct Zio ZIO;
     19 
     20 #define zgetc(z)  (((z)->n--)>0 ?  cast_uchar(*(z)->p++) : luaZ_fill(z))
     21 
     22 
     23 typedef struct Mbuffer {
     24   char *buffer;
     25   size_t n;
     26   size_t buffsize;
     27 } Mbuffer;
     28 
     29 #define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
     30 
     31 #define luaZ_buffer(buff)	((buff)->buffer)
     32 #define luaZ_sizebuffer(buff)	((buff)->buffsize)
     33 #define luaZ_bufflen(buff)	((buff)->n)
     34 
     35 #define luaZ_resetbuffer(buff) ((buff)->n = 0)
     36 
     37 
     38 #define luaZ_resizebuffer(L, buff, size) \
     39 	(luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
     40 	(buff)->buffsize = size)
     41 
     42 #define luaZ_freebuffer(L, buff)	luaZ_resizebuffer(L, buff, 0)
     43 
     44 
     45 LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
     46 LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
     47                                         void *data);
     48 LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n);	/* read next n bytes */
     49 
     50 
     51 
     52 /* --------- Private Part ------------------ */
     53 
     54 struct Zio {
     55   size_t n;			/* bytes still unread */
     56   const char *p;		/* current position in buffer */
     57   lua_Reader reader;		/* reader function */
     58   void* data;			/* additional data */
     59   lua_State *L;			/* Lua state (for reader) */
     60 };
     61 
     62 
     63 LUAI_FUNC int luaZ_fill (ZIO *z);
     64 
     65 #endif
     66