external/mit/lua/dist/src/lzio.h

   1 /*      $NetBSD: lzio.h,v 1.1.1.2 2012/03/15 00:08:14 alnsn Exp $       */
   2
   3 /*
   4 ** $Id: lzio.h,v 1.1.1.2 2012/03/15 00:08:14 alnsn Exp $
   5 ** Buffered streams
   6 ** See Copyright Notice in lua.h
   7 */
   8
   9
  10 #ifndef lzio_h
  11 #define lzio_h
  12
  13 #include "lua.h"
  14
  15 #include "lmem.h"
  16
  17
  18 #define EOZ     (-1)                    /* end of stream */
  19
  20 typedef struct Zio ZIO;
  21
  22 #define char2int(c)     cast(int, cast(unsigned char, (c)))
  23
  24 #define zgetc(z)  (((z)->n--)>0 ?  char2int(*(z)->p++) : luaZ_fill(z))
  25
  26 typedef struct Mbuffer {
  27   char *buffer;
  28   size_t n;
  29   size_t buffsize;
  30 } Mbuffer;
  31
  32 #define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
  33
  34 #define luaZ_buffer(buff)       ((buff)->buffer)
  35 #define luaZ_sizebuffer(buff)   ((buff)->buffsize)
  36 #define luaZ_bufflen(buff)      ((buff)->n)
  37
  38 #define luaZ_resetbuffer(buff) ((buff)->n = 0)
  39
  40
  41 #define luaZ_resizebuffer(L, buff, size) \
  42         (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
  43         (buff)->buffsize = size)
  44
  45 #define luaZ_freebuffer(L, buff)        luaZ_resizebuffer(L, buff, 0)
  46
  47
  48 LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
  49 LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
  50                                         void *data);
  51 LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n); /* read next n bytes */
  52 LUAI_FUNC int luaZ_lookahead (ZIO *z);
  53
  54
  55
  56 /* --------- Private Part ------------------ */
  57
  58 struct Zio {
  59   size_t n;                     /* bytes still unread */
  60   const char *p;                /* current position in buffer */
  61   lua_Reader reader;
  62   void* data;                   /* additional data */
  63   lua_State *L;                 /* Lua state (for reader) */
  64 };
  65
  66
  67 LUAI_FUNC int luaZ_fill (ZIO *z);
  68
  69 #endif