1 /* 2 ** $Id: lzio.h $ 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_buffremove(buff,i) ((buff)->n -= (i)) 36 #define luaZ_resetbuffer(buff) ((buff)->n = 0) 37 38 39 #define luaZ_resizebuffer(L, buff, size) \ 40 ((buff)->buffer = luaM_reallocvchar(L, (buff)->buffer, \ 41 (buff)->buffsize, size), \ 42 (buff)->buffsize = size) 43 44 #define luaZ_freebuffer(L, buff) luaZ_resizebuffer(L, buff, 0) 45 46 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 51 52 53 /* --------- Private Part ------------------ */ 54 55 struct Zio { 56 size_t n; /* bytes still unread */ 57 const char *p; /* current position in buffer */ 58 lua_Reader reader; /* reader function */ 59 void *data; /* additional data */ 60 lua_State *L; /* Lua state (for reader) */ 61 }; 62 63 64 LUAI_FUNC int luaZ_fill (ZIO *z); 65 66 #endif 67