/* wt_coder.cpp
 * Copyright (C) 2008, Francisco Claude, all rights reserved.
 *
 * wt_coder definition
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */
 
#include <wt_coder.h>

wt_coder::wt_coder() {
	user_count=0;
}

void wt_coder::use() {
	user_count++;
}

void wt_coder::unuse() {
	user_count--;
	if(user_count==0) delete this;
}

wt_coder * wt_coder::load(FILE *fp) {
  uint rd;
  if(fread(&rd,sizeof(uint),1,fp)!=1) return NULL;
  fseek(fp,-sizeof(uint),SEEK_CUR);
  switch(rd) {
    case WT_CODER_HUFF_HDR: return wt_coder_huff::load(fp);
    case WT_CODER_BINARY_HDR: return wt_coder_binary::load(fp);
  }
  return NULL;
}
