131 lines
3.3 KiB
Java
131 lines
3.3 KiB
Java
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package de.trac.spherical.parser;
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import android.util.Log;
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import java.io.EOFException;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.PushbackInputStream;
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import java.math.BigInteger;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.Arrays;
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/**
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* Created by vanitas on 12.09.17.
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*/
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@SuppressWarnings("ResultOfMethodCallIgnored")
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public class SphereParser {
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public static final String TAG = "SphereParser";
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public static final String USE_PANORAMA_VIEWER = "GPano:UsePanoramaViewer=\"True\"";
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/*
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* 0 FF
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* 1 D8
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* 2 FF
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* 3 E1
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* 4 Length EXIF (n)
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* 5 Length EXIF (n)
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* 6 <exif>
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* n+4 </exif>
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* n+5 FF
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* n+6 E1
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* n+7 Length XML (m)
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* n+7 Length XML (m)
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* n+8 <xml>
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* n+8+m</xml>
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* n+5 <xml>
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* ? </xml>
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*/
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public static final byte[] FFE1 = new byte[] {
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(byte) 0xFF, (byte) 0xE1
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};
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public static final byte[] FFD8FFE1 = new byte[] {
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(byte) 0xFF, (byte) 0xD8, (byte) 0xFF, (byte) 0xE1
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};
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public static String getXMLContent(InputStream inputStream) throws IOException {
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if (inputStream == null) {
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throw new IllegalArgumentException("File MUST NOT be null!");
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}
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//HEADER
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byte[] r = new byte[FFD8FFE1.length];
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int i = inputStream.read(r);
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if (i != FFD8FFE1.length || !Arrays.equals(FFD8FFE1, r)) {
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System.out.println("Unexpected Image header: " + hex(r) + " (" + hex(FFD8FFE1) + " expected)");
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return null;
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}
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//EXIF Length
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r = new byte[2];
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i = inputStream.read(r);
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if (i != 2) {
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throw new EOFException("Unexpected EOF!");
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}
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int exifLen = integer(r);
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//Skip EXIF header
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r = new byte[exifLen - 2];
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i = inputStream.read(r);
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//XML Header
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r = new byte[2];
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i = inputStream.read(r);
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if (!Arrays.equals(FFE1, r)) {
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System.out.println("Image does not contain XML data.");
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return null;
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}
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r = new byte[2];
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i = inputStream.read(r);
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if (i != 2) {
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throw new EOFException("Unexpected EOF!");
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}
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int xmlLen = integer(r);
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byte[] xml = new byte[xmlLen - 2];
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i = inputStream.read(xml);
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if (i != xml.length) {
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throw new EOFException("Unexpected EOF!");
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}
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return new String(xml);
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}
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public static void main(String[] args) throws IOException {
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File file = new File(args[0]);
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System.out.println(getXMLContent(new FileInputStream(file)));
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}
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public static void unread(ArrayList<Byte> list, PushbackInputStream pb) throws IOException {
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for (int i = list.size() - 1; i >= 0; i--) {
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pb.unread(list.get(i));
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}
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}
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public static void append(ArrayList<Byte> list, byte[] array, int r) {
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for (int i = 0; i < r; i++) {
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list.add(array[i]);
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}
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}
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public static String hex(byte[] b) {
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return new BigInteger(b).toString(16);
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}
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public static int integer(byte[] b) {
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return new BigInteger(b).intValue();
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}
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}
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