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 18typedef struct Zio ZIO; 19 20#define zgetc(z) (((z)->n--)>0 ? cast_uchar(*(z)->p++) : luaZ_fill(z)) 21 22 23typedef 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 47LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, 48 void *data); 49LUAI_FUNC size_t luaZ_read (ZIO* z, void *b, size_t n); /* read next n bytes */ 50 51 52 53/* --------- Private Part ------------------ */ 54 55struct 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 64LUAI_FUNC int luaZ_fill (ZIO *z); 65 66#endif 67