Detection of the image format, first version (work in progress), see the bug report 1042

1 files changed, 428 insertions, 0 deletions

diff --git a/src/jogl/classes/com/jogamp/opengl/util/texture/ImageIOUtil.java b/src/jogl/classes/com/jogamp/opengl/util/texture/ImageIOUtil.java
new file mode 100644
index 000000000..e9e339a0c
--- /dev/null
+++ b/src/jogl/classes/com/jogamp/opengl/util/texture/ImageIOUtil.java
@@ -0,0 +1,428 @@
+/**
+ * Copyright 2014 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package com.jogamp.opengl.util.texture;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * Utilities for image input and output
+ *
+ */
+public class ImageIOUtil {
+
+	public static String getFileSuffix(InputStream stream) throws IOException {
+		if (stream == null) {
+            throw new IOException("Stream was null");
+        }
+		if (!(stream instanceof BufferedInputStream)) {
+			stream = new BufferedInputStream(stream);
+        }
+		if (!stream.markSupported()) {
+            throw new IOException("Can not get non-destructively the image format");
+        }
+		if (stream.available() < 32) {
+            throw new IOException("Not enough bytes to read in order to get the image format");
+        }
+		try {
+			stream.mark(32);
+			final byte[] b = new byte[32];
+			stream.read(b);
+			return getFileSuffix(b);
+		} finally {
+			stream.reset();
+		}
+		
+	}
+	
+    public static String getFileSuffix(final byte[] b) {
+    	/**
+         * http://www.faqs.org/faqs/jpeg-faq/part1/
+         * http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=54989
+         */
+        if ((b[0] == 0xff && b[1] == 0xd8 /* && b[2] == 0xff */)
+                || (b[0] == 0x4A && b[1] == 0x46 && b[2] == 0x49 && b[3] == 0x46)/* JFIF */
+                || (b[0] == 0x45 && b[1] == 0x78 && b[2] == 0x69 && b[3] == 0x66)/* EXIF */) {
+            return TextureIO.JPG;
+        }
+        /**
+         * http://www.libpng.org/pub/png/spec/1.1/PNG-Rationale.html#R.PNG-file-signature
+         */
+        if (b[0] == 0x89 && b[1] == 0x50 && b[2] == 0x4E && b[3] == 0x47 /* 'P' 'N' 'G', ascii code */
+                && b[4] == 0x0D && b[5] == 0x0A && b[6] == 0x1A && b[7] == 0x0A) {
+            return TextureIO.PNG;
+        }
+        /**
+         * Apple Icon Image
+         *
+         * 'i' 'c' 'n' 's' ascii code
+         */
+        if (b[0] == 0x69 && b[1] == 0x63 && b[2] == 0x6E && b[3] == 0x73) {
+            return "icns";
+        }
+        /**
+         * http://www.w3.org/Graphics/GIF/spec-gif87a.txt http://www.w3.org/Graphics/GIF/spec-gif89a.txt
+         *
+         * GIF87A or GIF89A ascii code
+         */
+        if (b[0] == 0x47 && b[1] == 0x49 && b[2] == 0x46 && b[3] == 0x38 && (b[4] == 0x37 || b[4] == 0x39)
+                && b[5] == 0x61) {
+            return TextureIO.GIF;
+        }
+        /**
+         * http://www.fileformat.info/format/bmp/spec/e27073c25463436f8a64fa789c886d9c/view.htm
+         *
+         * BM ascii code
+         */
+        if (b[0] == 0x42 && b[1] == 0x4d) {
+            return "bmp";
+        }
+        if (b[0] == 0x3A && b[1] == 0xDE && b[2] == 0x68 && b[3] == 0xB1) {
+            return "dcx";
+        }
+        if (b[0] == 0x0A && b[1] == 0x05 && b[2] == 0x01 && b[3] == 0x08) {
+            return "pcx";
+        }
+        /**
+         * http://netpbm.sourceforge.net/doc/ppm.html
+         */
+        if (b[0] == 0x50 && (b[1] == 0x33 /* plain */|| b[1] == 0x36)) {
+            return TextureIO.PPM;
+        }
+        if (b[0] == 0x38 && b[1] == 0x42 && b[2] == 0x50 && b[3] == 0x53 && b[4] == 0x00 && b[5] == 0x01
+                && b[6] == 0x00 && b[7] == 0x00 && b[8] == 0x00 && b[9] == 0x00) {
+            // Adobe PhotoShop
+            return "psd";
+        }
+        /**
+         * http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf
+         *
+         * intentionally detects only the little endian tiff images ("II" in the spec)
+         */
+        if (b[0] == 0x49 && b[1] == 0x49 && b[2] == 0x2A && b[3] == 0x00) {
+            return TextureIO.TIFF;
+        }
+        /**
+         * http://paulbourke.net/dataformats/sgirgb/sgiversion.html
+         *
+         * "474 saved as a short" 474 = 0x01DA
+         */
+        if (b[0] == 0x01 && b[1] == 0xDA /* && b[2] == 0x01 && b[3] == 0x01 && b[4] == 0x00 && b[5] == 0x03 */) {
+            return TextureIO.SGI_RGB;
+        }
+        /**
+         * 'D' 'D' 'S' ' ' ascii code
+         */
+        if (b[0] == 0x44 && b[1] == 0x44 && b[2] == 0x53 && b[3] == 0x20) {
+            return TextureIO.DDS;
+        }
+        /**
+         * http://netpbm.sourceforge.net/doc/pam.html
+         */
+        if (b[0] == 0x50 && b[1] == 0x37) {
+            return TextureIO.PAM;
+        }
+        /**
+         * http://netpbm.sourceforge.net/doc/pgm.html
+         */
+        if (b[0] == 0x50 && (b[1] == 0x32 /* plain */|| b[1] == 0x35)) {
+            return "pgm";
+        }
+        /**
+         * http://netpbm.sourceforge.net/doc/pbm.html
+         */
+        if (b[0] == 0x50 && (b[1] == 0x31 /* plain */|| b[1] == 0x34)) {
+            return "pbm";
+        }
+        if (b[0] == 0x3D && b[1] == 0x02) {
+            return "3d2";
+        }
+        if (b[0] == 0x33 && b[1] == 0x44 && b[2] == 0x4D && b[3] == 0x46) {
+            return "3dmf";
+        }
+        if (b[0] == 0x2A && b[1] == 0x2A && b[2] == 0x54 && b[3] == 0x49 && b[4] == 0x39 && b[5] == 0x32
+                && b[6] == 0x2A && b[7] == 0x2A && b[8] == 0x01 && b[9] == 0x00 && b[10] == 0x58
+                && b[11] == 0x6E && b[12] == 0x56 && b[13] == 0x69) {
+            return "92i";
+        }
+        if (b[0] == 0x41 && b[1] == 0x4D && b[2] == 0x46 && b[3] == 0x46) {
+            return "amff";
+        }
+        if (b[0] == 0x4A && b[1] == 0x47 && (b[2] == 0x03 || b[2] == 0x04) && b[3] == 0x0E && b[4] == 0x00
+                && b[5] == 0x00 && b[6] == 0x00) {
+            return "art";
+        }
+        if (b[0] == 0x73 && b[1] == 0x72 && b[2] == 0x63 && b[3] == 0x64 && b[4] == 0x6F && b[5] == 0x63
+                && b[6] == 0x69 && b[7] == 0x64 && b[8] == 0x3A) {
+            return "cals";
+        }
+        if (b[0] == 0x07 && b[1] == 0x20 && b[2] == 0x4D && b[3] == 0x4D) {
+            return "cam";
+        }
+        if (b[0] == 0x20 && b[1] == 0x77 && b[2] == 0x00 && b[3] == 0x02) {
+            return "cbd";
+        }
+        if (b[0] == 0x45 && b[1] == 0x59 && b[2] == 0x45 && b[3] == 0x53) {
+            return "ce2";
+        }
+        if (b[0] == 0x80 && b[1] == 0x2A && b[2] == 0x5F && b[3] == 0xD7 && b[4] == 0x00 && b[5] == 0x00
+                && b[6] == 0x08 && b[7] == 0x00 && b[8] == 0x00 && b[9] == 0x00 && b[10] == 0x04
+                && b[11] == 0x00 && b[12] == 0x00 && b[13] == 0x00) {
+            return "cin";
+        }
+        if (b[0] == 0x43 && b[1] == 0x61 && b[2] == 0x6C && b[3] == 0x69 && b[4] == 0x67 && b[5] == 0x61
+                && b[6] == 0x72 && b[7] == 0x69) {
+            return "cob";
+        }
+        if (b[0] == 0x43 && b[1] == 0x50 && b[2] == 0x54 && b[3] == 0x46 && b[4] == 0x49 && b[5] == 0x4C
+                && b[6] == 0x45) {
+            return "cpt";
+        }
+        if (b[0] == 0x43 && b[1] == 0x41 && b[2] == 0x4C && b[3] == 0x41 && b[4] == 0x4D && b[5] == 0x55
+                && b[6] == 0x53 && b[7] == 0x43 && b[8] == 0x56 && b[9] == 0x47) {
+            return "cvg";
+        }
+        if (b[0] == 0x56 && b[1] == 0x69 && b[2] == 0x73 && b[3] == 0x74 && b[4] == 0x61 && b[5] == 0x20
+                && b[6] == 0x44 && b[7] == 0x45 && b[8] == 0x4D && b[9] == 0x20 && b[10] == 0x46
+                && b[11] == 0x69 && b[12] == 0x6C && b[13] == 0x65) {
+            return "dem";
+        }
+        if (b[0] == 0x42 && b[1] == 0x4D && b[2] == 0x36) {
+            return "dib";
+        }
+        if (b[0] == 0x53 && b[1] == 0x44 && b[2] == 0x50 && b[3] == 0x58) {
+            return "dpx";
+        }
+        if (b[0] == 0x01 && b[1] == 0xFF && b[2] == 0x02 && b[3] == 0x04 && b[4] == 0x03 && b[5] == 0x02) {
+            return "drw";
+        }
+        if (b[0] == 0x41 && b[1] == 0x43 && b[2] == 0x31 && b[3] == 0x30) {
+            return "dwg";
+        }
+        if (b[0] == 0x65 && b[1] == 0x02 && b[2] == 0x01 && b[3] == 0x02) {
+            return "ecw";
+        }
+        if (b[0] == 0x01 && b[1] == 0x00 && b[2] == 0x00 && b[3] == 0x00 && b[4] == 0x58 && b[5] == 0x00
+                && b[6] == 0x00 && b[7] == 0x00) {
+            return "emf";
+        }
+        if (b[0] == 0xD0 && b[1] == 0xCF && b[2] == 0x11 && b[3] == 0xE0 && b[4] == 0xA1 && b[5] == 0xB1
+                && b[6] == 0x1A && b[7] == 0xE1 && b[8] == 0x00) {
+            return "fpx";
+        }
+        if (b[0] == 0x53 && b[1] == 0x49 && b[2] == 0x4D && b[3] == 0x50 && b[4] == 0x4C && b[5] == 0x45
+                && b[6] == 0x20 && b[7] == 0x20 && b[8] == 0x3D) {
+            return "fts";
+        }
+        if (b[0] == 0x48 && b[1] == 0x50 && b[2] == 0x48 && b[3] == 0x50 && b[4] == 0x34 && b[5] == 0x38
+                && b[6] == 0x2D && b[7] == 0x45 && b[8] == 0x1E && b[9] == 0x2B) {
+            return "gro";
+        }
+        if (b[0] == 0x6E && b[1] == 0x63 && b[2] == 0x6F && b[3] == 0x6C && b[4] == 0x73) {
+            return "hdr";
+        }
+        if (b[0] == 0x35 && b[1] == 0x4B && b[2] == 0x50 && b[3] == 0x35 && b[4] == 0x31 && b[5] == 0x5D
+                && b[6] == 0x2A && b[7] == 0x67 && b[8] == 0x72 && b[9] == 0x72 && b[10] == 0x80
+                && b[11] == 0x83 && b[12] == 0x85 && b[13] == 0x63) {
+            return "hru";
+        }
+        if (b[0] == 0xEB && b[1] == 0x3C && b[2] == 0x90 && b[3] == 0x2A) {
+            return "img";
+        }
+        if (b[0] == 0x65 && b[1] == 0x6C && b[2] == 0x6D && b[3] == 0x6F) {
+            return "infini-d";
+        }
+        if (b[0] == 0x49 && b[1] == 0x57 && b[2] == 0x43 && b[3] == 0x01) {
+            return "iwc";
+        }
+        if (b[0] == 0x80 && b[1] == 0x3E && b[2] == 0x44 && b[3] == 0x53 && b[4] == 0x43 && b[5] == 0x49
+                && b[6] == 0x4D) {
+            return "j6i";
+        }
+        if (b[0] == 0x4A && b[1] == 0x49 && b[2] == 0x46 && b[3] == 0x39 && b[4] == 0x39 && b[5] == 0x61) {
+            return "jif";
+        }
+        if (b[0] == 0x00 && b[1] == 0x00 && b[2] == 0x00 && b[3] == 0x0C && b[4] == 0x6A && b[5] == 0x50
+                && b[6] == 0x20 && b[7] == 0x20 && b[8] == 0x0D && b[9] == 0x0A && b[10] == 0x87
+                && b[11] == 0x0A) {
+            return "jp2";
+        }
+        if (b[0] == 0x4D && b[1] == 0x4D && b[2] == 0x00 && b[3] == 0x2A) {
+            return "kdc";
+        }
+        if (b[0] == 0x36 && b[1] == 0x34 && b[2] == 0x4C && b[3] == 0x41 && b[4] == 0x4E && b[5] == 0x20
+                && b[6] == 0x49 && b[7] == 0x44 && b[8] == 0x42 && b[9] == 0x4C && b[10] == 0x4F
+                && b[11] == 0x43 && b[12] == 0x4B) {
+            return "l64";
+        }
+        if (b[0] == 0x46 && b[1] == 0x4F && b[2] == 0x52 && b[3] == 0x4D) {
+            return "lbm";
+        }
+        if (b[0] == 0x49 && b[1] == 0x49 && b[2] == 0x2A && b[3] == 0x00 && b[4] == 0x08 && b[5] == 0x00
+                && b[6] == 0x00 && b[7] == 0x00 && b[8] == 0x0E && b[9] == 0x00 && b[10] == 0x00
+                && b[11] == 0x01 && b[12] == 0x04 && b[13] == 0x00) {
+            return "ldf";
+        }
+        if (b[0] == 0x57 && b[1] == 0x56 && b[2] == 0x02 && b[3] == 0x00 && b[4] == 0x47 && b[5] == 0x45
+                && b[6] == 0x00 && b[7] == 0x0E) {
+            return "lwf";
+        }
+        if (b[0] == 0x37 && b[1] == 0x00 && b[2] == 0x00 && b[3] == 0x10 && b[4] == 0x42 && b[5] == 0x00
+                && b[6] == 0x00 && b[7] == 0x10 && b[8] == 0x00 && b[9] == 0x00 && b[10] == 0x00
+                && b[11] == 0x00 && b[12] == 0x39 && b[13] == 0x64) {
+            return "mbm";
+        }
+        if (b[0] == 0x4D && b[1] == 0x47 && b[2] == 0x4C) {
+            return "mgl";
+        }
+        if (b[0] == 0x7B && b[1] == 0x0A && b[2] == 0x20 && b[3] == 0x20 && b[4] == 0x43 && b[5] == 0x72
+                && b[6] == 0x65 && b[7] == 0x61 && b[8] == 0x74 && b[9] == 0x65 && b[10] == 0x64) {
+            return "mif";
+        }
+        if (b[0] == 0x8A && b[1] == 0x4D && b[2] == 0x4E && b[3] == 0x47 && b[4] == 0x0D && b[5] == 0x0A
+                && b[6] == 0x1A && b[7] == 0x0A) {
+            return "mng";
+        }
+        if (b[0] == 0x4D && b[1] == 0x50 && b[2] == 0x46) {
+            return "mpw";
+        }
+        if (b[0] == 0x44 && b[1] == 0x61 && b[2] == 0x6E && b[3] == 0x4D) {
+            return "msp";
+        }
+        if (b[0] == 0x43 && b[1] == 0x36 && b[2] == 0x34) {
+            return "n64";
+        }
+        if (b[0] == 0x6E && b[1] == 0x6E && b[2] == 0x0A && b[3] == 0x00 && b[4] == 0x5E && b[5] == 0x00) {
+            return "ncr";
+        }
+        if (b[0] == 0x6E && b[1] == 0x66 && b[2] == 0x66) {
+            return "nff";
+        }
+        if (b[0] == 0x4E && b[1] == 0x47 && b[2] == 0x47 && b[3] == 0x00 && b[4] == 0x01 && b[5] == 0x00) {
+            return "ngg";
+        }
+        if (b[0] == 0x4E && b[1] == 0x4C && b[2] == 0x4D && b[3] == 0x20 && b[4] == 0x01 && b[5] == 0x02
+                && b[6] == 0x00) {
+            return "nlm";
+        }
+        if (b[0] == 0x4E && b[1] == 0x4F && b[2] == 0x4C && b[3] == 0x00 && b[4] == 0x01 && b[5] == 0x00
+                && b[6] == 0x06 && b[7] == 0x01 && b[8] == 0x03 && b[9] == 0x00) {
+            return "nol";
+        }
+        if (b[0] == 0x41 && b[1] == 0x48) {
+            return "pal";
+        }
+        if (b[0] == 0x50 && b[1] == 0x41 && b[2] == 0x58) {
+            return "pax";
+        }
+        if (b[0] == 0x63 && b[1] == 0x52 && b[2] == 0x01 && b[3] == 0x01 && b[4] == 0x38 && b[5] == 0x09
+                && b[6] == 0x3D && b[7] == 0x00) {
+            return "pcd";
+        }
+        if (b[0] == 0x1B && b[1] == 0x45 && b[2] == 0x1B && b[3] == 0x26 && b[4] == 0x6C && b[5] == 0x30
+                && b[6] == 0x4F && b[7] == 0x1B && b[8] == 0x26 && b[9] == 0x6C && b[10] == 0x30
+                && b[11] == 0x45 && b[12] == 0x1B && b[13] == 0x26) {
+            return "pcl";
+        }
+        if (b[0] == 0x50 && b[1] == 0x49 && b[2] == 0x58 && b[3] == 0x20) {
+            return "pix";
+        }
+        if (b[0] == 0x50 && b[1] == 0x4F && b[2] == 0x4C && b[3] == 0x20 && b[4] == 0x46 && b[5] == 0x6F
+                && b[6] == 0x72 && b[7] == 0x6D && b[8] == 0x61 && b[9] == 0x74) {
+            return "pol";
+        }
+        // Paint Shop Pro
+        if (b[0] == 0x7E && b[1] == 0x42 && b[2] == 0x4B && b[3] == 0x00) {
+            return "psp";
+        }
+        if (b[0] == 0x50 && b[1] == 0x61 && b[2] == 0x69 && b[3] == 0x6E && b[4] == 0x74 && b[5] == 0x20
+                && b[6] == 0x53 && b[7] == 0x68 && b[8] == 0x6F && b[9] == 0x70 && b[10] == 0x20
+                && b[11] == 0x50 && b[12] == 0x72 && b[13] == 0x6F && b[14] == 0x20 && b[15] == 0x49
+                && b[16] == 0x6D && b[17] == 0x61 && b[18] == 0x67 && b[19] == 0x65 && b[20] == 0x20
+                && b[21] == 0x46 && b[22] == 0x69 && b[23] == 0x6C && b[24] == 0x65) {
+            return "psp";
+        }
+        if (b[0] == 0x51 && b[1] == 0x4C && b[2] == 0x49 && b[3] == 0x49 && b[4] == 0x46 && b[5] == 0x41
+                && b[6] == 0x58) {
+            return "qfx";
+        }
+        if (b[0] == 0x6D && b[1] == 0x6F && b[2] == 0x6F && b[3] == 0x76) {
+            return "qtm";
+        }
+        if (b[0] == 0x46 && b[1] == 0x4F && b[2] == 0x52 && b[3] == 0x4D && b[4] == 0x41 && b[5] == 0x54
+                && b[6] == 0x3D) {
+            return "rad";
+        }
+        if (b[0] == 0x59 && b[1] == 0xA6 && b[2] == 0x6A && b[3] == 0x95) {
+            return "ras";
+        }
+        if (b[0] == 0x52 && b[1] == 0x49 && b[2] == 0x58 && b[3] == 0x33) {
+            return "rix";
+        }
+        if (b[0] == 0x23 && b[1] == 0x20 && b[2] == 0x24 && b[3] == 0x49 && b[4] == 0x64 && b[5] == 0x3A
+                && b[6] == 0x20) {
+            return "sid";
+        }
+        if (b[0] == 0x41 && b[1] == 0x75 && b[2] == 0x74 && b[3] == 0x6F && b[4] == 0x43 && b[5] == 0x41
+                && b[6] == 0x44 && b[7] == 0x20 && b[8] == 0x53 && b[9] == 0x6C && b[10] == 0x69
+                && b[11] == 0x64 && b[12] == 0x65) {
+            return "sld";
+        }
+        if (b[0] == 0x53 && b[1] == 0x74 && b[2] == 0x6F && b[3] == 0x72 && b[4] == 0x6D && b[5] == 0x33
+                && b[6] == 0x44) {
+            return "sod";
+        }
+        if (b[0] == 0xFA && b[1] == 0xDE && b[2] == 0xBA && b[3] == 0xBE && b[4] == 0x01 && b[5] == 0x01) {
+            return "wic";
+        }
+        if (b[0] == 0xD3 && b[1] == 0x23 && b[2] == 0x00 && b[3] == 0x00 && b[4] == 0x03 && b[5] == 0x00
+                && b[6] == 0x00 && b[7] == 0x00) {
+            return "wlm";
+        }
+        if (b[0] == 0xD7 && b[1] == 0xCD && b[2] == 0xC6 && b[3] == 0x9A) {
+            return "wmf";
+        }
+        if (b[0] == 0xFF && b[1] == 0x57 && b[2] == 0x50 && b[3] == 0x43 && b[4] == 0x10) {
+            return "wpg";
+        }
+        if (b[0] == 0x23 && b[1] == 0x56 && b[2] == 0x52 && b[3] == 0x4D && b[4] == 0x4C && b[5] == 0x20
+                && b[6] == 0x56 && b[7] == 0x32 && b[8] == 0x2E && b[9] == 0x30) {
+            return "wrl";
+        }
+        if (b[0] == 0x23 && b[1] == 0x64 && b[2] == 0x65 && b[3] == 0x66 && b[4] == 0x69 && b[5] == 0x6E
+                && b[6] == 0x65) {
+            return "xbm";
+        }
+        if (b[0] == 0x2F && b[1] == 0x2A && b[2] == 0x20 && b[3] == 0x58 && b[4] == 0x50 && b[5] == 0x4D
+                && b[6] == 0x20 && b[7] == 0x2A && b[8] == 0x2F) {
+            return "xpm";
+        }
+        return null;
+	}
+}