|
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 |
|
18 typedef 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 |
|
24 typedef 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 |
|
46 LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n); |
|
47 LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, |
|
48 void *data); |
|
49 LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n); /* read next n bytes */ |
|
50 LUAI_FUNC int luaZ_lookahead (ZIO *z); |
|
51 |
|
52 |
|
53 |
|
54 /* --------- Private Part ------------------ */ |
|
55 |
|
56 struct 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 |
|
65 LUAI_FUNC int luaZ_fill (ZIO *z); |
|
66 |
|
67 #endif |