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1
7
8 package com.sun.imageio.plugins.png;
9
10 import java.io.IOException  ;
11 import java.util.Locale ;
12 import java.util.Iterator ;
13 import javax.imageio.ImageReader ;
14 import javax.imageio.spi.ImageReaderSpi ;
15 import javax.imageio.metadata.IIOMetadataFormat ;
16 import javax.imageio.metadata.IIOMetadataFormatImpl ;
17 import javax.imageio.stream.ImageInputStream ;
18
19
22 public class PNGImageReaderSpi extends ImageReaderSpi {
23
24 private static final String vendorName = "Sun Microsystems, Inc.";
25
26 private static final String version = "1.0";
27
28 private static final String [] names = { "png" };
29
30 private static final String [] suffixes = { "png" };
31
32 private static final String [] MIMETypes = { "image/png", "image/x-png" };
33
34 private static final String readerClassName =
35 "com.sun.imageio.plugins.png.PNGImageReader";
36
37 private static final String [] writerSpiNames = {
38 "com.sun.imageio.plugins.png.PNGImageWriterSpi"
39 };
40
41 public PNGImageReaderSpi() {
42 super(vendorName,
43 version,
44 names,
45 suffixes,
46 MIMETypes,
47 readerClassName,
48 STANDARD_INPUT_TYPE,
49 writerSpiNames,
50 false,
51 null, null,
52 null, null,
53 true,
54 PNGMetadata.nativeMetadataFormatName,
55 "com.sun.imageio.plugins.png.PNGMetadataFormat",
56 null, null
57 );
58 }
59
60 public String getDescription(Locale locale) {
61 return "Standard PNG image reader";
62 }
63
64 public boolean canDecodeInput(Object input) throws IOException {
65 if (!(input instanceof ImageInputStream )) {
66 return false;
67 }
68
69 ImageInputStream stream = (ImageInputStream )input;
70 byte[] b = new byte[8];
71 stream.mark();
72 stream.readFully(b);
73 stream.reset();
74
75 return (b[0] == (byte)137 &&
76 b[1] == (byte)80 &&
77 b[2] == (byte)78 &&
78 b[3] == (byte)71 &&
79 b[4] == (byte)13 &&
80 b[5] == (byte)10 &&
81 b[6] == (byte)26 &&
82 b[7] == (byte)10);
83 }
84
85 public ImageReader createReaderInstance(Object extension) {
86 return new PNGImageReader(this);
87 }
88 }
89 |
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