/src/middleware/lua/lzio.h

 1/*
 2** $Id: lzio.h,v 1.21.1.1 2007/12/27 13:02:25 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 char2int(c)	cast(int, cast(unsigned char, (c)))
21
22#define zgetc(z)  (((z)->n--)>0 ?  char2int(*(z)->p++) : luaZ_fill(z))
23
24typedef struct Mbuffer {
25  char *buffer;
26  size_t n;
27  size_t buffsize;
28} Mbuffer;
29
30#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
31
32#define luaZ_buffer(buff)	((buff)->buffer)
33#define luaZ_sizebuffer(buff)	((buff)->buffsize)
34#define luaZ_bufflen(buff)	((buff)->n)
35
36#define luaZ_resetbuffer(buff) ((buff)->n = 0)
37
38
39#define luaZ_resizebuffer(L, buff, size) \
40	(luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
41	(buff)->buffsize = size)
42
43#define luaZ_freebuffer(L, buff)	luaZ_resizebuffer(L, buff, 0)
44
45
46LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
47LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
48                                        void *data);
49LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n);	/* read next n bytes */
50LUAI_FUNC int luaZ_lookahead (ZIO *z);
51
52
53
54/* --------- Private Part ------------------ */
55
56struct Zio {
57  size_t n;			/* bytes still unread */
58  const char *p;		/* current position in buffer */
59  lua_Reader reader;
60  void* data;			/* additional data */
61  lua_State *L;			/* Lua state (for reader) */
62};
63
64
65LUAI_FUNC int luaZ_fill (ZIO *z);
66
67#endif