rlm@1: /*
rlm@1: ** $Id: lzio.h,v 1.21.1.1 2007/12/27 13:02:25 roberto Exp $
rlm@1: ** Buffered streams
rlm@1: ** See Copyright Notice in lua.h
rlm@1: */
rlm@1: 
rlm@1: 
rlm@1: #ifndef lzio_h
rlm@1: #define lzio_h
rlm@1: 
rlm@1: #include "lua.h"
rlm@1: 
rlm@1: #include "lmem.h"
rlm@1: 
rlm@1: 
rlm@1: #define EOZ	(-1)			/* end of stream */
rlm@1: 
rlm@1: typedef struct Zio ZIO;
rlm@1: 
rlm@1: #define char2int(c)	cast(int, cast(unsigned char, (c)))
rlm@1: 
rlm@1: #define zgetc(z)  (((z)->n--)>0 ?  char2int(*(z)->p++) : luaZ_fill(z))
rlm@1: 
rlm@1: typedef struct Mbuffer {
rlm@1:   char *buffer;
rlm@1:   size_t n;
rlm@1:   size_t buffsize;
rlm@1: } Mbuffer;
rlm@1: 
rlm@1: #define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
rlm@1: 
rlm@1: #define luaZ_buffer(buff)	((buff)->buffer)
rlm@1: #define luaZ_sizebuffer(buff)	((buff)->buffsize)
rlm@1: #define luaZ_bufflen(buff)	((buff)->n)
rlm@1: 
rlm@1: #define luaZ_resetbuffer(buff) ((buff)->n = 0)
rlm@1: 
rlm@1: 
rlm@1: #define luaZ_resizebuffer(L, buff, size) \
rlm@1: 	(luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
rlm@1: 	(buff)->buffsize = size)
rlm@1: 
rlm@1: #define luaZ_freebuffer(L, buff)	luaZ_resizebuffer(L, buff, 0)
rlm@1: 
rlm@1: 
rlm@1: LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
rlm@1: LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
rlm@1:                                         void *data);
rlm@1: LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n);	/* read next n bytes */
rlm@1: LUAI_FUNC int luaZ_lookahead (ZIO *z);
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: /* --------- Private Part ------------------ */
rlm@1: 
rlm@1: struct Zio {
rlm@1:   size_t n;			/* bytes still unread */
rlm@1:   const char *p;		/* current position in buffer */
rlm@1:   lua_Reader reader;
rlm@1:   void* data;			/* additional data */
rlm@1:   lua_State *L;			/* Lua state (for reader) */
rlm@1: };
rlm@1: 
rlm@1: 
rlm@1: LUAI_FUNC int luaZ_fill (ZIO *z);
rlm@1: 
rlm@1: #endif