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Root/lua/lzio.h

1/*
2** $Id: lzio.h,v 1.21 2005/05/17 19:49:15 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#include "lmem.h"
14
15
16#define EOZ(-1)/* end of stream */
17
18typedef struct Zio ZIO;
19
20#define char2int(c)cast(int, cast(unsigned char, (c)))
21
22#define zgetc(z) (((z)->n--)>0 ? char2int(*(z)->p++) : luaZ_fill(z))
23
24typedef struct Mbuffer {
25 char *buffer;
26 size_t n;
27 size_t buffsize;
28} Mbuffer;
29
30#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
31
32#define luaZ_buffer(buff)((buff)->buffer)
33#define luaZ_sizebuffer(buff)((buff)->buffsize)
34#define luaZ_bufflen(buff)((buff)->n)
35
36#define luaZ_resetbuffer(buff) ((buff)->n = 0)
37
38
39#define luaZ_resizebuffer(L, buff, size) \
40(luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
41(buff)->buffsize = size)
42
43#define luaZ_freebuffer(L, buff)luaZ_resizebuffer(L, buff, 0)
44
45
46LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
47LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
48 void *data);
49LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n);/* read next n bytes */
50LUAI_FUNC int luaZ_lookahead (ZIO *z);
51
52
53
54/* --------- Private Part ------------------ */
55
56struct Zio {
57 size_t n;/* bytes still unread */
58 const char *p;/* current position in buffer */
59 lua_Reader reader;
60 void* data;/* additional data */
61 lua_State *L;/* Lua state (for reader) */
62};
63
64
65LUAI_FUNC int luaZ_fill (ZIO *z);
66
67#endif

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