module/lua/lzio.h

   1 /* BEGIN CSTYLED */
   2 /*
   3 ** $Id: lzio.h,v 1.26.1.1 2013/04/12 18:48:47 roberto Exp $
   4 ** Buffered streams
   5 ** See Copyright Notice in lua.h
   6 */
   7
   8
   9 #ifndef lzio_h
  10 #define lzio_h
  11
  12 #include <sys/lua/lua.h>
  13
  14 #include "lmem.h"
  15
  16
  17 #define EOZ     (-1)                    /* end of stream */
  18
  19 typedef struct Zio ZIO;
  20
  21 #define zgetc(z)  (((z)->n--)>0 ?  cast_uchar(*(z)->p++) : luaZ_fill(z))
  22
  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
  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 /* END CSTYLED */