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SphereParser with method to extract xml from image

intent-filter
vanitasvitae 5 years ago
parent
commit
1e689b6d46
Signed by: vanitasvitae
GPG Key ID: 62BEE9264BF17311
  1. 130
      app/src/main/java/de/trac/spherical/parser/SphereParser.java

130
app/src/main/java/de/trac/spherical/parser/SphereParser.java

@ -0,0 +1,130 @@
package de.trac.spherical.parser;
import android.util.Log;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
/**
* Created by vanitas on 12.09.17.
*/
@SuppressWarnings("ResultOfMethodCallIgnored")
public class SphereParser {
public static final String TAG = "SphereParser";
public static final String USE_PANORAMA_VIEWER = "GPano:UsePanoramaViewer=\"True\"";
/*
* 0 FF
* 1 D8
* 2 FF
* 3 E1
* 4 Length EXIF (n)
* 5 Length EXIF (n)
* 6 <exif>
* n+4 </exif>
* n+5 FF
* n+6 E1
* n+7 Length XML (m)
* n+7 Length XML (m)
* n+8 <xml>
* n+8+m</xml>
* n+5 <xml>
* ? </xml>
*/
public static final byte[] FFE1 = new byte[] {
(byte) 0xFF, (byte) 0xE1
};
public static final byte[] FFD8FFE1 = new byte[] {
(byte) 0xFF, (byte) 0xD8, (byte) 0xFF, (byte) 0xE1
};
public static String getXMLContent(InputStream inputStream) throws IOException {
if (inputStream == null) {
throw new IllegalArgumentException("File MUST NOT be null!");
}
//HEADER
byte[] r = new byte[FFD8FFE1.length];
int i = inputStream.read(r);
if (i != FFD8FFE1.length || !Arrays.equals(FFD8FFE1, r)) {
System.out.println("Unexpected Image header: " + hex(r) + " (" + hex(FFD8FFE1) + " expected)");
return null;
}
//EXIF Length
r = new byte[2];
i = inputStream.read(r);
if (i != 2) {
throw new EOFException("Unexpected EOF!");
}
int exifLen = integer(r);
//Skip EXIF header
r = new byte[exifLen - 2];
i = inputStream.read(r);
//XML Header
r = new byte[2];
i = inputStream.read(r);
if (!Arrays.equals(FFE1, r)) {
System.out.println("Image does not contain XML data.");
return null;
}
r = new byte[2];
i = inputStream.read(r);
if (i != 2) {
throw new EOFException("Unexpected EOF!");
}
int xmlLen = integer(r);
byte[] xml = new byte[xmlLen - 2];
i = inputStream.read(xml);
if (i != xml.length) {
throw new EOFException("Unexpected EOF!");
}
return new String(xml);
}
public static void main(String[] args) throws IOException {
File file = new File(args[0]);
System.out.println(getXMLContent(new FileInputStream(file)));
}
public static void unread(ArrayList<Byte> list, PushbackInputStream pb) throws IOException {
for (int i = list.size() - 1; i >= 0; i--) {
pb.unread(list.get(i));
}
}
public static void append(ArrayList<Byte> list, byte[] array, int r) {
for (int i = 0; i < r; i++) {
list.add(array[i]);
}
}
public static String hex(byte[] b) {
return new BigInteger(b).toString(16);
}
public static int integer(byte[] b) {
return new BigInteger(b).intValue();
}
}
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