src/lua/lzio.h

   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