lzio.c File Reference

#include <string.h>
#include "lua.h"
#include "llimits.h"
#include "lmem.h"
#include "lstate.h"
#include "lzio.h"

Go to the source code of this file.

Macros
#define	lzio_c
#define	LUA_CORE

Functions
int	luaZ_fill (ZIO *z)
void	luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data)
size_t	luaZ_read (ZIO *z, void *b, size_t n)
char *	luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n)

Macro Definition Documentation

LUA_CORE

#define LUA_CORE

Definition at line 11 of file lua-5.2.4/src/lzio.c.

lzio_c

#define lzio_c

Definition at line 10 of file lua-5.2.4/src/lzio.c.

Function Documentation

luaZ_fill()

int luaZ_fill

(

ZIO *

z

)

Definition at line 21 of file lua-5.2.4/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;  /* discount char being returned */
  z->p = buff;
  return cast_uchar(*(z->p++));
}

References cast_uchar, Zio::data, EOZ, Zio::L, lua_lock, lua_unlock, Zio::n, NULL, Zio::p, and Zio::reader.

Referenced by luaZ_read().

luaZ_init()

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

Definition at line 36 of file lua-5.2.4/src/lzio.c.

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

References Zio::data, Zio::L, Zio::n, NULL, Zio::p, Zio::reader, and reader().

luaZ_openspace()

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

Definition at line 68 of file lua-5.2.4/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.

luaZ_read()

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

Definition at line 46 of file lua-5.2.4/src/lzio.c.

                                             {
  while (n) {
    size_t m;
    if (z->n == 0) {  /* no bytes in buffer? */
      if (luaZ_fill(z) == EOZ)  /* try to read more */
        return n;  /* no more input; return number of missing bytes */
      else {
        z->n++;  /* luaZ_fill consumed first byte; put it back */
        z->p--;
      }
    }
    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;
}

References EOZ, luaZ_fill(), Zio::n, and Zio::p.