Nicht symmetrischen java Kompression

Question

Ich habe eine Datenprobe:

byte[] b = new byte[]{120, 1, -67, -107, -51, 106, 20, 81, 16, -123, 107, 18, -51, -60, 31, -30, 117, -4, -53, -60, -123, 25, 70, 71, 23, -111, 89, 12, 8, -83, 49, 4, -14, -93, -63, 73, 32, 89, -55, -112, -123, 10, -30, 66, 69, -110, 69, -64, -107, -77, 8, -72, 21, 23, -82, 5, -97, -64, 55, -48, -73, -16, 97, 4, -3, 14, -23, -110, 75, 59, 125, 39, 8, -10, -123, 51, -73, -86, -85, -6, 84, -99, -22, -18, 59, 53, 51, 27, 2, 95, 7, 24, 95, -36, 97, 95, 9, 102, -17, 46, -101, -51, -81, 109, -82, -101, -43, 44, -100, 54, -5, -56, -11, 9, -128, 105, -81, -128, -42, -25, -109, 102, -121, -109, 102, 63, 107, 102, 75, 32, 94, 79, -66, -43, 109, -15, -57, 9, 91, -79, 55, -74, 111, -49, -71, 103, -51, 54, 13, 58, -42, 121, 112, 22, 76, 3, -15, 5, -32, -21, 20, 70, 0, -94, 19, -58, -59, -59, 19, -128, -81, 51, 24, 1, -8, -3, 23, -80, -107, 35, -1, 38, -104, -51, 109, 54, 123, -12, -6, -67, 54, -69, 1, 60, -57, 109, 122, 27, -34, -29, -70, 122, -68, 10, 2, 80, 111, -102, -45, 29, 16, -64, 1, 40, -6, 15, -71, -26, -15, 45, -20, 103, 5, -1, 65, -28, 95, -57, 126, 90, -16, -69, -111, -33, -64, 46, -6, 47, -93, -72, -6, -39, 3, -9, -127, -6, 92, -52, -9, 37, -10, 89, -96, -72, -18, -9, 62, 93, 91, 29, 109, 110, 19, 30, -34, -30, -57, -11, 23, 103, -12, -31, -21, 119, -94, -57, -97, 81, 32, -9, 54, 120, 12, -60, -21, -21, 87, -66, 120, 93, -84, 73, 70, -117, -89, -47, -78, -7, 100, 94, 11, 21, 77, 107, 48, -21, 70, 50, -81, 78, -4, 72, 113, -102, 79, 111, 64, -99, -38, 1, -108, -51, 76, -3, -118, -83, 5, -92, -61, -25, -12, 63, 103, -42, -50, -21, -92, 102, -74, 64, 39, 61, -69, 6, -82, 36, 103, -47, 67, -35, 2, 95, 77, 27, -92, -8, -26, -120, 31, 77, 54, -51, -41, -96, -26, 28, -75, -37, -96, 108, 102, -102, -105, -66, -45, 94, -82, -93, -118, -103, 101, -44, -46, -5, -107, -46, -72, 74, 70, -97, 39, -39, -25, 61, 74, -27, -11, -19, -100, -83, -14, 5, 101, 32, -107, -41, 37, -34, 33, -73, 51, -122, -81, 67, -51, 46, -75, 51, 80, 54, -77, 14, -67, 79, -125, 126, -82, -93, -118, -103, 109, 80, 75, 103, 89, 74, -29, 14, 25, 3, -69, 4, 102, -110, 121, 3, -101, -78, 29, -72, -60, -103, -30, 91, 38, -98, -111, -101, -115, -31, -53, -88, -71, 76, -19, 13, 80, 54, 51, 61, 115, -83, 1, -112, -114, 127, -103, 25, -57, -112, 40, -2, -36, 91, -117, 108, -98, -57, 95, 103, 126, -109, -8, 39, -32, 103, -70, -50, -20, -94, -1, 54, -118, 43, 95, 126, -103, 6, -113, 59, 79, 21, 26, -12, 31, 16, -9, 124, 119, -124, 31, 107, 80, 126, 74, -125, -57, -99, -89, 10, 13, -21, -123, -98, -73, 71, -8, -79, 6, -27, -89, 52, 120, -36, 121, -86, -48, -80, 91, -24, -7, -59, 8, 63, -42, -96, -4, -108, 6, -113, 59, -49, 113, 52, -52, -64, 121, 17, 104, 5, 32, -5, 55, -108, 74, -2, -44}; 

es ist nur ein komprimiertes EMF-Bild. Ich versuche, es von Code zu dekomprimieren:

InflaterInputStream iis = new InflaterInputStream(new ByteArrayInputStream(b)); 
    ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
    byte[] buf = new byte[4096]; 
    int length = 0; 
    while ((length = iis.read(buf)) > 0) { 
     baos.write(buf, 0, length); 
    } 

und eine richtige Antwort

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0, 16, 0, 0, 0, 92, 0, 0, 0, -106, 0, 0, 0, 54, 0, 0, 0, 16, 0, 0, 0, 103, 0, 0, 0, -106, 0, 0, 0, 54, 0, 0, 0, 16, 0, 0, 0, 103, 0, 0, 0, 121, 0, 0, 0, 54, 0, 0, 0, 16, 0, 0, 0, 92, 0, 0, 0, 121, 0, 0, 0, 61, 0, 0, 0, 8, 0, 0, 0, 60, 0, 0, 0, 8, 0, 0, 0, 62, 0, 0, 0, 24, 0, 0, 0, 92, 0, 0, 0, 121, 0, 0, 0, 103, 0, 0, 0, -106, 0, 0, 0, 37, 0, 0, 0, 12, 0, 0, 0, 7, 0, 0, -128, 37, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, -128, 40, 0, 0, 0, 12, 0, 0, 0, 1, 0, 0, 0, 14, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0, 0, 20, 0, 0, 0] 

Danach bin ich versuchen, es durch Code zurück zu komprimieren:

ByteArrayOutputStream baos2 = new ByteArrayOutputStream(); 
    //Deflater defalter = new Deflater(1); 
    DeflaterOutputStream dos = new DeflaterOutputStream(baos2);//deflater, false); 
    dos.write(baos.toByteArray(), 0 , baos.toByteArray().length); 
    dos.finish(); 

und ein Ergebnis:

[120, -100, -67, 84, 77, 47, 3, 81, 20, 61, -29, -85, 45, 13, -29, 91, 89, -48, -108, -78, 32, -77, -112, 72, -22, -93, 105, -126, -46, 40, 9, 43, 105, 44, -112, -120, 5, 34, 44, 36, 86, -70, -112, -40, -118, -123, -75, -60, 47, -16, 15, -8, 23, 126, -116, -124, 51, -45, -5, -30, -103, -52, -68, -63, 98, 94, 114, -46, 119, 122, -49, -36, 123, -49, 25, 106, 1, -88, -29, -5, 92, 17, -49, 26, 95, -74, -127, -101, 1, 96, 108, 117, -77, 12, 88, -80, -37, -127, 7, 126, -33, 68, -16, -118, 83, -47, 61, -75, 2, -73, -51, -64, -121, 5, 20, 45, -4, 56, -5, -81, 9, 44, -66, -73, 96, 25, -25, -72, -60, 17, -97, 89, -59, 38, -54, 94, -83, -101, 72, 19, 73, -23, 103, 107, -49, -91, -124, 91, -126, -88, 122, -38, 87, -17, -16, -43, 123, 69, -29, -34, 39, -119, 33, -71, -69, 103, -29, -20, -50, -5, -100, -48, 52, -22, -50, -35, -22, 11, -78, -29, -120, -12, 76, 73, 78, 115, -62, -81, 2, -8, -70, -58, -73, -120, 67, 31, 95, -45, -8, 56, 113, -32, -29, -114, -58, 123, 2, -8, -119, -58, -35, 125, 46, -120, 37, -39, 115, 81, 62, -117, -30, 51, 37, -49, -85, 61, -107, -73, 4, -67, -87, 59, 79, 125, -54, -112, -47, -3, -53, -37, -97, 50, 114, 49, 67, -20, 18, 83, -38, 123, -7, -108, -61, 63, 23, 100, -88, -56, 114, 82, 22, 99, 70, 93, -106, -101, 100, -24, -38, 38, 76, -70, -124, -105, -116, -69, -75, -71, -97, -21, 46, -63, -39, 54, 17, -106, 25, 36, -25, -84, -8, -120, 35, -77, -100, -44, 77, -69, 79, 83, 49, -117, 81, 98, -48, -88, -101, 101, -57, 105, -2, -41, -28, 8, -109, 110, -104, -11, 70, -78, -26, 126, 61, -100, 57, -52, -39, 57, 34, 44, 51, 55, -81, 118, 111, 118, -61, 71, 28, -103, 21, 100, 103, -45, -18, 43, -84, 84, -7, 38, -85, -100, 100, -46, 85, -47, 69, 109, -110, 61, -109, 70, -99, -61, 122, -98, -38, 124, 68, -65, 60, 103, 58, -84, 22, -120, -80, -52, -14, -62, -85, -46, 39, -114, -52, 42, 114, 55, -19, -66, 67, 69, 13, -3, 68, -89, 81, 87, 67, 27, -75, -115, -98, 38, 93, -55, 123, 87, 109, -124, -71, 95, -127, 51, 75, -100, 93, 33, -62, 50, 43, -56, 115, 53, -15, -15, -97, -52, 56, -18, 79, -103, 101, -120, 71, -4, -4, -115, -10, -13, 107, -115, 103, -124, -121, 121, 80, 117, -43, 39, 14, 15, -114, 111, -25, -7, 0, -82, 123, 112, 34, 60, -88, -70, -22, 19, -121, -121, -78, 111, -25, -19, 0, -82, 123, 40, 71, 120, 80, 117, -43, 39, 14, 15, 123, -66, -99, -113, 3, -72, -18, 97, 47, -62, -125, -86, -85, 62, -65, -15, -48, 73, -12, -55, -2, -74, -36, -65, 0, -108, 74, -2, -44] 

desto ähnlicher r Das Ergebnis wurde erreicht, wenn ich die Deflater-Initialisierung auszeichne und den DeflateOutputStream-Konstruktor verwende.

Für mich ist es sehr seltsames Verhalten oder ich benutze nicht aufblasen/deflate Mechanismus richtig.

Irgendeine Idee?

Answer 1

Verlustfreie Kompressoren, die man so nennen kann, stellen sicher, dass die Kompression, gefolgt von der Dekompression, genau das Gleiche hervorbringt wie das, womit Sie angefangen haben.

Auf der anderen Seite gibt es keine Zusicherung oder Notwendigkeit, sicherzustellen, dass die Dekompression mit anschließender Kompression immer das gleiche Ergebnis liefert. Kompressoren können dem komprimierten Datenformat entsprechen, aber abhängig von dem verwendeten Algorithmus und den Parametern des gewählten Algorithmus sehr unterschiedliche Ergebnisse mit denselben Eingabedaten erzeugen. Kompressoren haben oft unterschiedliche "Komprimierungsstufen", die es dem Benutzer erlauben, mehr oder weniger CPU-Komprimierung je nach Anwendung besser oder schlechter zu verwenden. So erhalten Sie unterschiedliche Ausgabe mit verschiedenen Einstellungen.