1 /*
2 ** $Id: lzio.h,v 1.31.1.1 2017/04/19 17:20:42 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_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