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1 /*
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2 ** $Id: lzio.h,v 1.21.1.1 2007/12/27 13:02:25 roberto Exp $
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3 ** Buffered streams
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4 ** See Copyright Notice in lua.h
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5 */
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6
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7
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8 #ifndef lzio_h
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9 #define lzio_h
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10
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11 #include "lua.h"
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12
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13 #include "lmem.h"
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14
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15
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16 #define EOZ (-1) /* end of stream */
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17
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18 typedef struct Zio ZIO;
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19
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20 #define char2int(c) cast(int, cast(unsigned char, (c)))
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21
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22 #define zgetc(z) (((z)->n--)>0 ? char2int(*(z)->p++) : luaZ_fill(z))
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23
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24 typedef struct Mbuffer {
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25 char *buffer;
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26 size_t n;
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27 size_t buffsize;
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28 } Mbuffer;
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29
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30 #define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
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31
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32 #define luaZ_buffer(buff) ((buff)->buffer)
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33 #define luaZ_sizebuffer(buff) ((buff)->buffsize)
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34 #define luaZ_bufflen(buff) ((buff)->n)
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35
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36 #define luaZ_resetbuffer(buff) ((buff)->n = 0)
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37
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38
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39 #define luaZ_resizebuffer(L, buff, size) \
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40 (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
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41 (buff)->buffsize = size)
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42
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43 #define luaZ_freebuffer(L, buff) luaZ_resizebuffer(L, buff, 0)
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44
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45
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46 LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
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47 LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
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48 void *data);
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49 LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n); /* read next n bytes */
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50 LUAI_FUNC int luaZ_lookahead (ZIO *z);
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51
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52
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53
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54 /* --------- Private Part ------------------ */
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55
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56 struct Zio {
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57 size_t n; /* bytes still unread */
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58 const char *p; /* current position in buffer */
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59 lua_Reader reader;
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60 void* data; /* additional data */
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61 lua_State *L; /* Lua state (for reader) */
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62 };
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63
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64
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65 LUAI_FUNC int luaZ_fill (ZIO *z);
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66
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67 #endif
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