src/lzio.h

   1 /*
   2 ** $Id: lzio.h,v 1.15 2003/03/20 16:00:56 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
  14 #define EOZ     (-1)                    /* end of stream */
  15
  16 typedef struct Zio ZIO;
  17
  18
  19 #define char2int(c)     cast(int, cast(unsigned char, (c)))
  20
  21 #define zgetc(z)  (((z)->n--)>0 ?  char2int(*(z)->p++) : luaZ_fill(z))
  22
  23 #define zname(z)        ((z)->name)
  24
  25 void luaZ_init (ZIO *z, lua_Chunkreader reader, void *data, const char *name);
  26 size_t luaZ_read (ZIO* z, void* b, size_t n);   /* read next n bytes */
  27 int luaZ_lookahead (ZIO *z);
  28
  29
  30
  31 typedef struct Mbuffer {
  32   char *buffer;
  33   size_t buffsize;
  34 } Mbuffer;
  35
  36
  37 char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
  38
  39 #define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
  40
  41 #define luaZ_sizebuffer(buff)   ((buff)->buffsize)
  42 #define luaZ_buffer(buff)       ((buff)->buffer)
  43
  44 #define luaZ_resizebuffer(L, buff, size) \
  45         (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
  46         (buff)->buffsize = size)
  47
  48 #define luaZ_freebuffer(L, buff)        luaZ_resizebuffer(L, buff, 0)
  49
  50
  51 /* --------- Private Part ------------------ */
  52
  53 struct Zio {
  54   size_t n;                     /* bytes still unread */
  55   const char *p;                /* current position in buffer */
  56   lua_Chunkreader reader;
  57   void* data;                   /* additional data */
  58   const char *name;
  59 };
  60
  61
  62 int luaZ_fill (ZIO *z);
  63
  64 #endif