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4680 | right-hear | 1 | /* |
2 | ** $Id: lzio.h,v 1.22 2009/05/18 17:26:25 roberto Exp $ |
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3 | ** Buffered streams |
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4 | ** See Copyright Notice in lua.h |
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5 | */ |
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6 | |||
7 | |||
8 | #ifndef lzio_h |
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9 | #define lzio_h |
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10 | |||
11 | #include "lua.h" |
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12 | |||
13 | #include "lmem.h" |
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14 | |||
15 | |||
16 | #define EOZ (-1) /* end of stream */ |
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17 | |||
18 | typedef struct Zio ZIO; |
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19 | |||
20 | #define char2int(c) cast(int, cast(unsigned char, (c))) |
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21 | |||
22 | #define zgetc(z) (((z)->n--)>0 ? char2int(*(z)->p++) : luaZ_fill(z)) |
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23 | |||
24 | #define zungetc(z) ((z)->n++, (z)->p--) |
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25 | |||
26 | |||
27 | typedef struct Mbuffer { |
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28 | char *buffer; |
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29 | size_t n; |
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30 | size_t buffsize; |
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31 | } Mbuffer; |
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32 | |||
33 | #define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0) |
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34 | |||
35 | #define luaZ_buffer(buff) ((buff)->buffer) |
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36 | #define luaZ_sizebuffer(buff) ((buff)->buffsize) |
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37 | #define luaZ_bufflen(buff) ((buff)->n) |
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38 | |||
39 | #define luaZ_resetbuffer(buff) ((buff)->n = 0) |
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40 | |||
41 | |||
42 | #define luaZ_resizebuffer(L, buff, size) \ |
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43 | (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \ |
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44 | (buff)->buffsize = size) |
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45 | |||
46 | #define luaZ_freebuffer(L, buff) luaZ_resizebuffer(L, buff, 0) |
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47 | |||
48 | |||
49 | LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n); |
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50 | LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, |
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51 | void *data); |
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52 | LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n); /* read next n bytes */ |
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53 | LUAI_FUNC int luaZ_lookahead (ZIO *z); |
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54 | |||
55 | |||
56 | |||
57 | /* --------- Private Part ------------------ */ |
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58 | |||
59 | struct Zio { |
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60 | size_t n; /* bytes still unread */ |
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61 | const char *p; /* current position in buffer */ |
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62 | lua_Reader reader; |
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63 | void* data; /* additional data */ |
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64 | lua_State *L; /* Lua state (for reader) */ |
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65 | }; |
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66 | |||
67 | |||
68 | LUAI_FUNC int luaZ_fill (ZIO *z); |
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69 | |||
70 | #endif |