package railo.runtime.functions.file;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import railo.commons.io.IOUtil;
import railo.commons.io.res.Resource;
import railo.runtime.exp.PageException;
import railo.runtime.op.Caster;
public class FileStreamWrapperReadBinary extends FileStreamWrapper {
private BufferedInputStream bis;
private boolean isEOF;
private boolean seekable;
private RandomAccessFile raf;
/**
* Constructor of the class
* @param res
* @param charset
* @throws IOException
*/
public FileStreamWrapperReadBinary(Resource res,boolean seekable) {
super(res);
this.seekable=seekable;
}
@Override
public Object read(int len) throws IOException {
byte[] barr=new byte[len];
len=seekable?getRAF().read(barr):_getBIS().read(barr);
if(len!=barr.length) {
byte[] rtn=new byte[len];
for(int i=0;i<len;i++) {
rtn[i]=barr[i];
}
barr=rtn;
isEOF=true;
}
return barr;
}
@Override
public void close() throws IOException {
super.setStatus(FileStreamWrapper.STATE_CLOSE);
if(bis!=null)bis.close();
if(raf!=null)raf.close();
}
@Override
public String getMode() {
return "readBinary";
}
public boolean isEndOfFile() {
return isEOF;
}
@Override
public long getSize() {
return res.length();
}
@Override
public void skip(int len) throws PageException {
if(seekable){
try {
getRAF().skipBytes(len);
} catch (IOException e) {
throw Caster.toPageException(e);
}
return;
}
try {
_getBIS().skip(len);
return;
}
catch (IOException e) {}
throw Caster.toPageException(new IOException("skip is only supported when you have set argument seekable of function fileOpen to true"));
}
public void seek(long pos) throws PageException {
if(seekable){
try {
getRAF().seek(pos);
} catch (IOException e) {
throw Caster.toPageException(e);
}
}
else throw Caster.toPageException(new IOException("seek is only supported when you have set argument seekable of function fileOpen to true"));
}
private RandomAccessFile getRAF() throws IOException {
if(raf==null){
if(!(res instanceof File))
throw new IOException("only resources for local filesytem support seekable");
raf = new RandomAccessFile((File)res,"r");
}
return raf;
}
private BufferedInputStream _getBIS() throws IOException {
if(bis==null)bis = IOUtil.toBufferedInputStream(res.getInputStream());
return bis;
}
}