01: /******************************************************************************
02: * PNG.java
03: * ****************************************************************************/package org.openlaszlo.media;
04:
05: import java.io.InputStream;
06: import java.io.IOException;
07: import java.io.DataInputStream;
08:
09: /**
10: * PNG
11: */
12: public class PNG {
13: static public boolean is(InputStream str) throws IOException {
14:
15: final int magic = 0x89504e47; // 137 PNG
16:
17: DataInputStream ds = new DataInputStream(str);
18: return (ds.readInt() == magic);
19: }
20: }
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