1  /*
2  ** $Id: lzio.h $
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_buffremove(buff,i)	((buff)->n -= (i))
36  #define luaZ_resetbuffer(buff) ((buff)->n = 0)
37  
38  
39  #define luaZ_resizebuffer(L, buff, size) \
40  	((buff)->buffer = luaM_reallocvchar(L, (buff)->buffer, \
41  				(buff)->buffsize, size), \
42  	(buff)->buffsize = size)
43  
44  #define luaZ_freebuffer(L, buff)	luaZ_resizebuffer(L, buff, 0)
45  
46  
47  LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
48                                          void *data);
49  LUAI_FUNC size_t luaZ_read (ZIO* z, void *b, size_t n);	/* read next n bytes */
50  
51  
52  
53  /* --------- Private Part ------------------ */
54  
55  struct Zio {
56    size_t n;			/* bytes still unread */
57    const char *p;		/* current position in buffer */
58    lua_Reader reader;		/* reader function */
59    void *data;			/* additional data */
60    lua_State *L;			/* Lua state (for reader) */
61  };
62  
63  
64  LUAI_FUNC int luaZ_fill (ZIO *z);
65  
66  #endif
67