/*
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** $Id: lzio.h,v 1.31.1.1 2017/04/19 17:20:42 roberto Exp $
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** Buffered streams
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** See Copyright Notice in lua.h
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*/
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#ifndef lzio_h
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#define lzio_h
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#include "lua.h"
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#include "lmem.h"
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#define EOZ (-1) /* end of stream */
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typedef struct Zio ZIO;
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#define zgetc(z) (((z)->n--)>0 ? cast_uchar(*(z)->p++) : luaZ_fill(z))
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typedef struct Mbuffer {
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char *buffer;
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size_t n;
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size_t buffsize;
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} Mbuffer;
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#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
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#define luaZ_buffer(buff) ((buff)->buffer)
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#define luaZ_sizebuffer(buff) ((buff)->buffsize)
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#define luaZ_bufflen(buff) ((buff)->n)
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#define luaZ_buffremove(buff,i) ((buff)->n -= (i))
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#define luaZ_resetbuffer(buff) ((buff)->n = 0)
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#define luaZ_resizebuffer(L, buff, size) \
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((buff)->buffer = luaM_reallocvchar(L, (buff)->buffer, \
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(buff)->buffsize, size), \
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(buff)->buffsize = size)
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#define luaZ_freebuffer(L, buff) luaZ_resizebuffer(L, buff, 0)
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LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
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void *data);
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LUAI_FUNC size_t luaZ_read (ZIO* z, void *b, size_t n); /* read next n bytes */
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/* --------- Private Part ------------------ */
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struct Zio {
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size_t n; /* bytes still unread */
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const char *p; /* current position in buffer */
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lua_Reader reader; /* reader function */
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void *data; /* additional data */
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lua_State *L; /* Lua state (for reader) */
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};
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LUAI_FUNC int luaZ_fill (ZIO *z);
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#endif
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