xref: /illumos-gate/usr/src/uts/common/fs/zfs/lua/lzio.h (revision dfc115332c94a2f62058ac7f2bce7631fbd20b3d)
1 /*
2 ** $Id: lzio.h,v 1.26.1.1 2013/04/12 18:48:47 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