| commit | author | age | ||
| 6e1425 | 1 | /* |
| H | 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 | |
