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/****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one *
* or more contributor license agreements. See the NOTICE file *
* distributed with this work for additional information *
* regarding copyright ownership. The ASF licenses this file *
* to you under the Apache License, Version 2.0 (the *
* "License"); you may not use this file except in compliance *
* with the License. You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, *
* software distributed under the License is distributed on an *
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
* KIND, either express or implied. See the License for the *
* specific language governing permissions and limitations *
* under the License. *
****************************************************************/
package org.apache.james.mime4j;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
/**
* InputStream which converts <code>\r</code>
* bytes not followed by <code>\n</code> and <code>\n</code> not
* preceded by <code>\r</code> to <code>\r\n</code>.
*
*
* @version $Id: EOLConvertingInputStream.java,v 1.4 2004/11/29 13:15:42 ntherning Exp $
*/
public class EOLConvertingInputStream extends InputStream {
/** Converts single '\r' to '\r\n' */
public static final int CONVERT_CR = 1;
/** Converts single '\n' to '\r\n' */
public static final int CONVERT_LF = 2;
/** Converts single '\r' and '\n' to '\r\n' */
public static final int CONVERT_BOTH = 3;
private PushbackInputStream in = null;
private int previous = 0;
private int flags = CONVERT_BOTH;
private int size = 0;
private int pos = 0;
private int nextTenPctPos;
private int tenPctSize;
private Callback callback;
public interface Callback {
public void report(int bytesRead);
}
/**
* Creates a new <code>EOLConvertingInputStream</code>
* instance converting bytes in the given <code>InputStream</code>.
* The flag <code>CONVERT_BOTH</code> is the default.
*
* @param in the <code>InputStream</code> to read from.
*/
public EOLConvertingInputStream(InputStream _in) {
super();
in = new PushbackInputStream(_in, 2);
}
/**
* Creates a new <code>EOLConvertingInputStream</code>
* instance converting bytes in the given <code>InputStream</code>.
*
* @param _in the <code>InputStream</code> to read from.
* @param _size the size of the input stream (need not be exact)
* @param _callback a callback reporting when each 10% of stream's size is reached
*/
public EOLConvertingInputStream(InputStream _in, int _size, Callback _callback) {
this(_in);
size = _size;
tenPctSize = size / 10;
nextTenPctPos = tenPctSize;
callback = _callback;
}
/**
* Closes the underlying stream.
*
* @throws IOException on I/O errors.
*/
public void close() throws IOException {
in.close();
}
private int readByte() throws IOException {
int b = in.read();
if (b != -1) {
if (callback != null && pos++ == nextTenPctPos) {
nextTenPctPos += tenPctSize;
if (callback != null) {
callback.report(pos);
}
}
}
return b;
}
private void unreadByte(int c) throws IOException {
in.unread(c);
pos--;
}
/**
* @see java.io.InputStream#read()
*/
public int read() throws IOException {
int b = readByte();
if (b == -1) {
pos = size;
return -1;
}
if ((flags & CONVERT_CR) != 0 && b == '\r') {
int c = readByte();
if (c != -1) {
unreadByte(c);
}
if (c != '\n') {
unreadByte('\n');
}
} else if ((flags & CONVERT_LF) != 0 && b == '\n' && previous != '\r') {
b = '\r';
unreadByte('\n');
}
previous = b;
return b;
}
}
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