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// java.io.FileInputStream
// An implementation of the Java Language Specification section 22.4
// Written by Charles Briscoe-Smith; refer to the file LEGAL for details.
package java.io;
public class FileInputStream extends InputStream {
public FileInputStream(String path)
throws SecurityException, FileNotFoundException
{
SecurityManager man=System.getSecurityManager();
if (man!=null) man.checkRead(path);
fd=FileDescriptor.openread(path);
this.path=path;
}
public FileInputStream(File f)
throws SecurityException, FileNotFoundException
{
String path=f.getPath();
SecurityManager man=System.getSecurityManager();
if (man!=null) man.checkRead(path);
fd=FileDescriptor.openread(path);
this.path=path;
}
public FileInputStream(FileDescriptor fd) throws SecurityException
{
SecurityManager man=System.getSecurityManager();
if (man!=null) man.checkRead(fd.fd());
this.fd=fd;
}
private FileDescriptor fd;
private String path;
public final FileDescriptor getFD() throws IOException {
return fd;
}
public int read() throws IOException
{
byte[] buffer=new byte[1];
int read=fd.read(buffer, 0, 1);
if (read==0) return -1;
else if (read<0) Errno.throwError(path);
else return buffer[0] & 0xff;
}
public int read(byte[] b, int off, int len)
throws IOException, NullPointerException,
IndexOutOfBoundsException
{
if (off<0 || len<0 || off+len>b.length)
throw new IndexOutOfBoundsException();
if (len==0) return 0;
int read=fd.read(b, off, len);
if (read==0) return -1;
if (read<0) Errno.throwError(path);
return read;
}
public long skip(long n) throws IOException
{
// FIXME
return read(new byte[(int) n]);
}
public int available() throws IOException
{
// FIXME
return 0;
}
public void close() throws IOException
{
if (fd.close()<0) Errno.throwError(path);
}
protected void finalize() throws IOException
{
close();
}
}
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