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1
7
8 package com.sun.imageio.plugins.gif;
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.metadata.IIOMetadataFormat ;
15 import javax.imageio.metadata.IIOMetadataFormatImpl ;
16 import javax.imageio.spi.ImageReaderSpi ;
17 import javax.imageio.stream.ImageInputStream ;
18
19
22 public class GIFImageReaderSpi 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 = { "gif" };
29
30 private static final String [] suffixes = { "gif" };
31
32 private static final String [] MIMETypes = { "image/gif" };
33
34 private static final String readerClassName =
35 "com.sun.imageio.plugins.gif.GIFImageReader";
36
37 private static final String [] writerSpiNames = null;
38
39 public GIFImageReaderSpi() {
40 super(vendorName,
41 version,
42 names,
43 suffixes,
44 MIMETypes,
45 readerClassName,
46 STANDARD_INPUT_TYPE,
47 writerSpiNames,
48 true,
49 GIFStreamMetadata.nativeMetadataFormatName,
50 "com.sun.imageio.plugins.gif.GIFStreamMetadataFormat",
51 null, null,
52 true,
53 GIFImageMetadata.nativeMetadataFormatName,
54 "com.sun.imageio.plugins.gif.GIFImageMetadataFormat",
55 null, null
56 );
57 }
58
59 public String getDescription(Locale locale) {
60 return "Standard GIF image reader";
61 }
62
63 public boolean canDecodeInput(Object input) throws IOException {
64 if (!(input instanceof ImageInputStream )) {
65 return false;
66 }
67
68 ImageInputStream stream = (ImageInputStream )input;
69 byte[] b = new byte[6];
70 stream.mark();
71 stream.readFully(b);
72 stream.reset();
73
74 return b[0] == 'G' && b[1] == 'I' && b[2] == 'F' && b[3] == '8' &&
75 (b[4] == '7' || b[4] == '9') && b[5] == 'a';
76 }
77
78 public ImageReader createReaderInstance(Object extension) {
79 return new GIFImageReader(this);
80 }
81
82 }
83 |
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