| 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 |