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1
51 package org.apache.fop.image.analyser;
52
53 import java.io.BufferedInputStream  ;
55 import java.io.IOException ;
56
57
61 public class BMPReader extends AbstractImageReader {
62
63 protected static final int BMP_SIG_LENGTH = 26;
64
65 protected byte[] header;
66
67 public boolean verifySignature(String uri, BufferedInputStream fis)
68 throws IOException {
69 this.imageStream = fis;
70 this.setDefaultHeader();
71 boolean supported = ((header[0] == (byte)0x42)
72 && (header[1] == (byte)0x4d));
73 if (supported) {
74 setDimension();
75 return true;
76 } else
77 return false;
78 }
79
80 public String getMimeType() {
81 return "image/bmp";
82 }
83
84 protected void setDimension() {
85 int byte1 = header[18] & 0xff;
87 int byte2 = header[19] & 0xff;
88 int byte3 = header[20] & 0xff;
89 int byte4 = header[21] & 0xff;
90 long l = (long)((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
91 this.width = (int)(l & 0xffffffff);
92
93 byte1 = header[22] & 0xff;
94 byte2 = header[23] & 0xff;
95 byte3 = header[24] & 0xff;
96 byte4 = header[25] & 0xff;
97 l = (long)((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
98 this.height = (int)(l & 0xffffffff);
99 }
100
101 protected void setDefaultHeader() throws IOException {
102 this.header = new byte[BMP_SIG_LENGTH];
103 try {
104 this.imageStream.mark(BMP_SIG_LENGTH + 1);
105 this.imageStream.read(header);
106 this.imageStream.reset();
107 } catch (IOException ex) {
108 try {
109 this.imageStream.reset();
110 } catch (IOException exbis) {}
111 throw ex;
112 }
113 }
114
115 }
116
117 |
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