1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.imaging.formats.jpeg.segments;
18
19 import static org.apache.commons.imaging.common.BinaryFunctions.readBytes;
20
21 import java.io.IOException;
22 import java.io.InputStream;
23 import java.io.PrintWriter;
24 import java.nio.charset.Charset;
25
26 public abstract class GenericSegment extends AbstractSegment {
27 private final byte[] segmentData;
28
29 public GenericSegment(final int marker, final byte[] bytes) {
30 super(marker, bytes.length);
31
32 this.segmentData = bytes.clone();
33 }
34
35 public GenericSegment(final int marker, final int markerLength, final InputStream is) throws IOException {
36 super(marker, markerLength);
37
38 segmentData = readBytes("Segment Data", is, markerLength, "Invalid Segment: insufficient data");
39 }
40
41 @Override
42 public void dump(final PrintWriter pw) {
43 dump(pw, 0);
44 }
45
46 public void dump(final PrintWriter pw, final int start) {
47 for (int i = 0; i < 50 && i + start < segmentData.length; i++) {
48 debugNumber(pw, "\t" + (i + start), segmentData[i + start], 1);
49 }
50 }
51
52 /**
53 * Returns a copy of the segment's contents, excluding the marker and length bytes at the beginning.
54 *
55 * @return the segment's contents
56 */
57 public byte[] getSegmentData() {
58 return segmentData.clone();
59 }
60
61 /**
62 * Returns a specific byte of the segment's contents, excluding the marker and length bytes at the beginning.
63 *
64 * @param offset segment offset
65 * @see GenericSegment#getSegmentData()
66 * @return the bye in the segment's contents
67 */
68 protected byte getSegmentData(final int offset) {
69 return segmentData[offset];
70 }
71
72 /**
73 * Convert the bytes to a String
74 *
75 * @param encoding segment encoding
76 * @return the encoded bytes
77 */
78 public String getSegmentDataAsString(final Charset encoding) {
79 return new String(segmentData, encoding);
80 }
81
82 }