+
−/*
+
−** $Id: lzio.c,v 1.31.1.1 2007/12/27 13:02:25 roberto Exp $
+
−** a generic input stream interface
+
−** See Copyright Notice in lua.h
+
−*/
+
−
+
−
+
−#include <string.h>
+
−
+
−#define lzio_c
+
−#define LUA_CORE
+
−
+
−#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;
+
−  z->p = buff;
+
−  return char2int(*(z->p++));
+
−}
+
−
+
−
+
−int luaZ_lookahead (ZIO *z) {
+
−  if (z->n == 0) {
+
−    if (luaZ_fill(z) == EOZ)
+
−      return EOZ;
+
−    else {
+
−      z->n++;  /* luaZ_fill removed first byte; put back it */
+
−      z->p--;
+
−    }
+
−  }
+
−  return char2int(*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 (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;
+
−}
+
−
+
−/* ------------------------------------------------------------------------ */
+
−char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) {
+
−  if (n > buff->buffsize) {
+
−    if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
+
−    luaZ_resizebuffer(L, buff, n);
+
−  }
+
−  return buff->buffer;
+
−}
+
−
+
−