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package com.jclark.xml.sax;
import java.io.Reader;
import java.io.InputStream;
import java.io.IOException;
/**
* An InputStream of the UTF-16 encoding of a Reader.
*
* @version $Revision: 1.3 $ $Date: 1998/05/04 07:46:28 $
*/
public class ReaderInputStream extends InputStream {
private Reader reader;
private static final int BUF_SIZE = 4096;
private char[] buf = new char[BUF_SIZE];
private int bufIndex = 0;
private int bufEnd = 1;
/* true if we have read the first nibble of the character at bufIndex
but not yet read the second */
private boolean nibbled = false;
public ReaderInputStream(Reader reader) {
this.reader = reader;
buf[0] = '\ufeff';
}
public synchronized int read() throws IOException {
if (nibbled) {
nibbled = false;
return buf[bufIndex++] & 0xff;
}
while (bufIndex == bufEnd) {
bufIndex = 0;
bufEnd = reader.read(buf, 0, buf.length);
if (bufEnd < 0) {
bufEnd = 0;
return -1;
}
}
nibbled = true;
return buf[bufIndex] >> 8;
}
public synchronized int read(byte b[], int off, int len) throws IOException {
if (len <= 0)
return 0;
int startOff = off;
if (nibbled) {
nibbled = false;
if (b != null)
b[off] = (byte)(buf[bufIndex] & 0xff);
bufIndex++;
off++;
len--;
}
while (len > 0) {
if (bufIndex == bufEnd) {
bufIndex = 0;
bufEnd = reader.read(buf, 0, buf.length);
if (bufEnd < 0) {
bufEnd = 0;
if (off != startOff)
break;
return -1;
}
if (bufEnd == 0)
return off - startOff;
}
if (len == 1) {
if (b != null)
b[off] = (byte)(buf[bufIndex] >> 8);
off++;
nibbled = true;
break;
}
if (b != null) {
b[off++] = (byte)(buf[bufIndex] >> 8);
b[off++] = (byte)(buf[bufIndex] & 0xff);
}
else
off += 2;
len -= 2;
bufIndex++;
}
return off - startOff;
}
public synchronized void close() throws IOException {
reader.close();
}
}
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