| /* |
| * 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.tika.parser.hwp; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.poi.util.IOUtils; |
| import org.apache.poi.util.LittleEndian; |
| |
| public class HwpStreamReader { |
| private byte[] skipBuffer = new byte[4096]; |
| private InputStream input; |
| private byte[] buf; |
| |
| public HwpStreamReader(InputStream inputStream) { |
| this.input = inputStream; |
| buf = new byte[4]; |
| } |
| |
| |
| /** |
| * unsigned 1 byte |
| * |
| * @return |
| * @throws IOException |
| */ |
| public short uint8() throws IOException { |
| int read = IOUtils.readFully(input, buf, 0, 1); |
| |
| if (read == -1) { |
| return -1; |
| } |
| |
| return LittleEndian.getUByte(buf); |
| } |
| |
| /** |
| * unsigned 2 byte |
| * |
| * @return |
| * @throws IOException |
| */ |
| public int uint16() throws IOException { |
| int read = IOUtils.readFully(input, buf, 0, 2); |
| |
| if (read == -1) { |
| return -1; |
| } |
| |
| if (read < 2) { |
| throw new EOFException(); |
| } |
| return LittleEndian.getUShort(buf); |
| } |
| |
| /** |
| * unsigned 2 byte array |
| * |
| * @param i |
| * @return |
| * @throws IOException |
| */ |
| public int[] uint16(int i) throws IOException { |
| if (i <= 0) { |
| throw new IllegalArgumentException(); |
| } |
| byte[] buf = new byte[i * 2]; |
| int read = IOUtils.readFully(input, buf, 0, i * 2); |
| |
| if (read != i * 2) { |
| throw new EOFException(); |
| } |
| int[] uints = new int[i]; |
| for (int ii = 0; ii < i; ii++) { |
| uints[ii] = LittleEndian.getUShort(buf, ii * 2); |
| } |
| |
| return uints; |
| } |
| |
| /** |
| * unsigned 4 byte |
| * |
| * @return |
| * @throws IOException |
| */ |
| public long uint32() throws IOException { |
| int read = IOUtils.readFully(input, buf, 0, 4); |
| |
| if (read == -1) { |
| return -1; |
| } |
| |
| if (read < 4) { |
| throw new EOFException(); |
| } |
| |
| return LittleEndian.getUInt(buf); |
| } |
| |
| /** |
| * ensure skip of n byte |
| * |
| * @param n |
| * @throws IOException |
| */ |
| public void ensureSkip(long n) throws IOException { |
| //Leaving this for anyone who can figure out why this doesn't |
| //work. See HwpV5ParserTest#testMultiThreadedSkipFully |
| //long skipped = org.apache.tika.io.IOUtils.skip(input, n); |
| long skipped = org.apache.tika.io.IOUtils.skip(input, n, skipBuffer); |
| if (skipped != n) { |
| throw new EOFException(); |
| } |
| } |
| } |