/***************************************************************************** * * 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.padaf.preflight.font.type1; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import org.apache.commons.io.IOUtils; public class PeekInputStream extends InputStream { private byte[] content = new byte[0]; private int position = 0; public PeekInputStream(InputStream source) throws IOException { ByteArrayOutputStream bos = new ByteArrayOutputStream(); try { IOUtils.copyLarge(source, bos); content = bos.toByteArray(); } finally { IOUtils.closeQuietly(source); IOUtils.closeQuietly(bos); } } @Override public int read() throws IOException { if (position >= content.length) { throw new IOException("No more content in this stream"); } int currentByte = (content[position] & 0xFF); ++position; return currentByte; } public int peek() throws IOException { if (position >= content.length) { throw new IOException("No more content in this stream"); } return (content[position] & 0xFF); } public byte[] peek(int numberOfBytes) throws IOException { if ( numberOfBytes < 0 || (position + numberOfBytes) >= content.length) { throw new IOException("No more content in this stream, can't return the next " + numberOfBytes + " bytes"); } byte[] nextBytes = new byte[numberOfBytes]; System.arraycopy(this.content, this.position, nextBytes, 0, numberOfBytes); return nextBytes; } }