lzio.h File Reference

#include "lua.h"
#include "lmem.h"

Go to the source code of this file.

Data Structures
struct	Mbuffer
struct	Zio

Macros
#define	EOZ   (-1) /* end of stream */
#define	zgetc(z)   (((z)->n--)>0 ? cast_uchar(*(z)->p++) : luaZ_fill(z))
#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)
#define	luaZ_freebuffer(L, buff)   luaZ_resizebuffer(L, buff, 0)

Typedefs
typedef struct Zio	ZIO
typedef struct Mbuffer	Mbuffer

Functions
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)
LUAI_FUNC int	luaZ_fill (ZIO *z)

Macro Definition Documentation

EOZ

#define EOZ   (-1) /* end of stream */

Definition at line 16 of file lua-5.2.4/src/lzio.h.

luaZ_buffer

#define luaZ_buffer

(

buff

)

((buff)->buffer)

Definition at line 31 of file lua-5.2.4/src/lzio.h.

luaZ_bufflen

#define luaZ_bufflen

(

buff

)

((buff)->n)

Definition at line 33 of file lua-5.2.4/src/lzio.h.

luaZ_freebuffer

#define luaZ_freebuffer	(		L,
			buff )   luaZ_resizebuffer(L, buff, 0)

Definition at line 42 of file lua-5.2.4/src/lzio.h.

luaZ_initbuffer

#define luaZ_initbuffer	(		L,
			buff )   ((buff)->buffer = NULL, (buff)->buffsize = 0)

Definition at line 29 of file lua-5.2.4/src/lzio.h.

luaZ_resetbuffer

#define luaZ_resetbuffer

(

buff

)

((buff)->n = 0)

Definition at line 35 of file lua-5.2.4/src/lzio.h.

luaZ_resizebuffer

#define luaZ_resizebuffer	(		L,
			buff,
			size )

Value:

    (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
    (buff)->buffsize = size)

Definition at line 38 of file lua-5.2.4/src/lzio.h.

#define luaZ_resizebuffer(L, buff, size) \
    (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
    (buff)->buffsize = size)

luaZ_sizebuffer

#define luaZ_sizebuffer

(

buff

)

((buff)->buffsize)

Definition at line 32 of file lua-5.2.4/src/lzio.h.

zgetc

#define zgetc

(

z

)

(((z)->n--)>0 ? cast_uchar(*(z)->p++) : luaZ_fill(z))

Definition at line 20 of file lua-5.2.4/src/lzio.h.

Typedef Documentation

Mbuffer

typedef struct Mbuffer Mbuffer

ZIO

typedef struct Zio ZIO

Definition at line 18 of file lua-5.2.4/src/lzio.h.

Function Documentation

luaZ_fill()

LUAI_FUNC int luaZ_fill

(

ZIO *

z

)

Definition at line 21 of file lua-5.1.5/src/lzio.c.

                       {
  size_t size;
  lua_State *L = z->L;
  const char *buff;
  lua_unlock(L);
  buff = z->reader(L, z->data, &size);
  lua_lock(L);
  if (buff == NULL || size == 0) return EOZ;
  z->n = size - 1;
  z->p = buff;
  return char2int(*(z->p++));
}

luaZ_init()

LUAI_FUNC void luaZ_init	(	lua_State *	L,
		ZIO *	z,
		lua_Reader	reader,
		void *	data )

Definition at line 48 of file lua-5.1.5/src/lzio.c.

                                                                     {
  z->L = L;
  z->reader = reader;
  z->data = data;
  z->n = 0;
  z->p = NULL;
}

luaZ_openspace()

LUAI_FUNC char * luaZ_openspace	(	lua_State *	L,
		Mbuffer *	buff,
		size_t	n )

Definition at line 74 of file lua-5.1.5/src/lzio.c.

                                                             {
  if (n > buff->buffsize) {
    if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
    luaZ_resizebuffer(L, buff, n);
  }
  return buff->buffer;
}

References Mbuffer::buffer, Mbuffer::buffsize, LUA_MINBUFFER, and luaZ_resizebuffer.

Referenced by LoadString(), LoadString(), luaV_concat(), and luaV_concat().

luaZ_read()

LUAI_FUNC size_t luaZ_read	(	ZIO *	z,
		void *	b,
		size_t	n )

Definition at line 58 of file lua-5.1.5/src/lzio.c.

                                             {
  while (n) {
    size_t m;
    if (luaZ_lookahead(z) == EOZ)
      return n;  /* return number of missing bytes */
    m = (n <= z->n) ? n : z->n;  /* min. between n and z->n */
    memcpy(b, z->p, m);
    z->n -= m;
    z->p += m;
    b = (char *)b + m;
    n -= m;
  }
  return 0;
}