ba8b5c17 |
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 | |
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 |