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/*

** $Id: lzio.c $

** Buffered streams

** See Copyright Notice in lua.h

*/

#define lzio_c

#define LUA_CORE

#include "lprefix.h"

#include <string.h>

#include "lua.h"

#include "llimits.h"

#include "lmem.h"

#include "lstate.h"

#include "lzio.h"

int luaZ_fill (ZIO *z) {

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++));

}

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

z->L = L;

z->reader = reader;

z->data = data;

z->n = 0;

z->p = NULL;

}

/* --------------------------------------------------------------- read --- */

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

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;

}