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
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_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
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 */
50
51
52
53/* --------- Private Part ------------------ */
54
55struct 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
64LUAI_FUNC int luaZ_fill (ZIO *z);
65
66#endif
67