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
18typedef struct Zio ZIO;
19
20#define zgetc(z)  (((z)->n--)>0 ?  cast_uchar(*(z)->p++) : luaZ_fill(z))
21
22
23typedef 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
45LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
46LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
47                                        void *data);
48LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n);	/* read next n bytes */
49
50
51
52/* --------- Private Part ------------------ */
53
54struct 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
63LUAI_FUNC int luaZ_fill (ZIO *z);
64
65#endif
66