lzio.h
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上传日期:2020-08-09
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- /*
- ** $Id: lzio.h,v 1.21 2005/05/17 19:49:15 roberto Exp $
- ** Buffered streams
- ** See Copyright Notice in lua.h
- */
- #ifndef lzio_h
- #define lzio_h
- #include "lua.h"
- #include "lmem.h"
- #define EOZ (-1) /* end of stream */
- typedef struct Zio ZIO;
- #define char2int(c) cast(int, cast(unsigned char, (c)))
- #define zgetc(z) (((z)->n--)>0 ? char2int(*(z)->p++) : luaZ_fill(z))
- typedef struct Mbuffer {
- char *buffer;
- size_t n;
- size_t buffsize;
- } Mbuffer;
- #define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
- #define luaZ_buffer(buff) ((buff)->buffer)
- #define luaZ_sizebuffer(buff) ((buff)->buffsize)
- #define luaZ_bufflen(buff) ((buff)->n)
- #define luaZ_resetbuffer(buff) ((buff)->n = 0)
- #define luaZ_resizebuffer(L, buff, size)
- (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char),
- (buff)->buffsize = size)
- #define luaZ_freebuffer(L, buff) luaZ_resizebuffer(L, buff, 0)
- LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
- LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
- void *data);
- LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n); /* read next n bytes */
- LUAI_FUNC int luaZ_lookahead (ZIO *z);
- /* --------- Private Part ------------------ */
- struct Zio {
- size_t n; /* bytes still unread */
- const char *p; /* current position in buffer */
- lua_Reader reader;
- void* data; /* additional data */
- lua_State *L; /* Lua state (for reader) */
- };
- LUAI_FUNC int luaZ_fill (ZIO *z);
- #endif