FileInputStream.java [plain text]
package java.io;
import java.nio.channels.FileChannel;
public class FileInputStream extends InputStream
{
private FileDescriptor fd;
private FileChannel ch;
public FileInputStream(String name) throws FileNotFoundException
{
SecurityManager s = System.getSecurityManager();
if (s != null)
s.checkRead(name);
fd = new FileDescriptor(name, FileDescriptor.READ);
}
public FileInputStream(File file) throws FileNotFoundException
{
this(file.getPath());
}
public FileInputStream(FileDescriptor fdObj)
{
SecurityManager s = System.getSecurityManager();
if (s != null)
s.checkRead(fdObj);
fd = fdObj;
}
public int available() throws IOException
{
return fd.available();
}
public void close() throws IOException
{
if (fd.valid())
fd.close();
}
protected void finalize() throws IOException
{
}
public final FileDescriptor getFD() throws IOException
{
if (!fd.valid())
throw new IOException();
return fd;
}
public int read() throws IOException
{
return fd.read();
}
public int read(byte[] b) throws IOException
{
return fd.read(b, 0, b.length);
}
public int read(byte[] b, int off, int len) throws IOException
{
if (off < 0 || len < 0 || off + len > b.length)
throw new ArrayIndexOutOfBoundsException();
return fd.read(b, off, len);
}
public long skip(long n) throws IOException
{
long startPos = fd.getFilePointer();
long endPos = fd.seek(n, FileDescriptor.CUR, true);
return endPos - startPos;
}
public FileChannel getChannel ()
{
return ch;
}
}