/*
* ====================================================================
* Copyright (c) 2004-2009 TMate Software Ltd. All rights reserved.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://svnkit.com/license.html.
* If newer versions of this license are posted there, you may use a
* newer version instead, at your option.
* ====================================================================
*/
package org.tmatesoft.svn.core.internal.util;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import org.tmatesoft.svn.core.SVNException;
import org.tmatesoft.svn.core.internal.wc.IOExceptionWrapper;
/**
* @author TMate Software Ltd.
* @version 1.3
*/
public class SVNCharsetInputStream extends FilterInputStream {
private static final int DEFAULT_BUFFER_CAPACITY = 1024;
private SVNCharsetConvertor myCharsetConvertor;
private byte[] mySourceBuffer;
private ByteBuffer myConvertedBuffer;
private boolean myEndOfStream;
public SVNCharsetInputStream(InputStream in, Charset inputCharset, Charset outputCharset) {
super(in);
myCharsetConvertor = new SVNCharsetConvertor(inputCharset.newDecoder(), outputCharset.newEncoder());
mySourceBuffer = new byte[DEFAULT_BUFFER_CAPACITY];
myConvertedBuffer = ByteBuffer.allocate(DEFAULT_BUFFER_CAPACITY);
myEndOfStream = false;
}
public int read() throws IOException {
byte[] b = new byte[1];
int r = read(b);
if (r < 0) {
return -1;
}
return b[0];
}
public int read(byte[] b) throws IOException {
return read(b, 0, b.length);
}
public int read(byte b[], int off, int len) throws IOException {
int available = myConvertedBuffer.position();
if (myEndOfStream && available == 0){
return -1;
}
while (available < len) {
int readed = fillBuffer();
try {
myConvertedBuffer = myCharsetConvertor.convertChunk(mySourceBuffer, 0, readed, myConvertedBuffer, myEndOfStream);
if (myEndOfStream) {
myConvertedBuffer = myCharsetConvertor.flush(myConvertedBuffer);
break;
}
} catch (SVNException e) {
throw new IOExceptionWrapper(e);
} finally {
available = myConvertedBuffer.position();
}
}
myConvertedBuffer.flip();
len = Math.min(myConvertedBuffer.remaining(), len);
myConvertedBuffer = myConvertedBuffer.get(b, off, len);
myConvertedBuffer = myConvertedBuffer.compact();
return len;
}
private int fillBuffer() throws IOException {
int readed = 0;
while (readed < mySourceBuffer.length) {
int r = in.read(mySourceBuffer, readed, mySourceBuffer.length - readed);
if (r < 0) {
myEndOfStream = true;
break;
}
readed += r;
}
return readed;
}
}