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Apache Sanselan is a pure-Java image library.

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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.sanselan.formats.pnm;

import java.io.IOException;
import java.io.InputStream;

class WhiteSpaceReader
{
	private final InputStream is;

	public WhiteSpaceReader(InputStream is)
	{
		this.is = is;
	}

	int count = 0;

	private char read() throws IOException
	{
		int result = is.read();
		if (result < 0)
			throw new IOException("PNM: Unexpected EOF");
		return (char) result;
	}

	public char nextChar() throws IOException
	{
		char c = (char) read();

		if (c == '#')
		{
			while ((c != '\n') && (c != '\r'))
			{
				c = (char) read();
			}
		}
		return c;
	}

	public String readtoWhiteSpace() throws IOException
	{
		char c = nextChar();

		while (Character.isWhitespace(c))
			c = nextChar();

		StringBuffer buffer = new StringBuffer();

		while (!Character.isWhitespace(c))
		{
			buffer.append(c);
			c = nextChar();
		}

		return buffer.toString();
	}
}