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| 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 |
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