1 /* 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 68