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 66
