client/deps/liblua/lzio.h

   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
  18 typedef struct Zio ZIO;
  19
  20 #define zgetc(z)  (((z)->n--)>0 ?  cast_uchar(*(z)->p++) : luaZ_fill(z))
  21
  22
  23 typedef 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
  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