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Huffman

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Flav

Experte

  • »Flav« ist der Autor dieses Themas

Beiträge: 205

  • Private Nachricht senden

1

Montag, 9. April 2012, 07:15

Huffman

Hier nochmal Huffman als Java-Code, alternativ könnt ihr aber auch einfach meine knuddels.jar benutzen, die Mentos in seinem Thread zur Verfügung stellt.

Huffman.java

Quellcode

 
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/**
 *
 * @author Flav
 */
public class Huffman {
	private static HuffmanEncoder encoder;
	private static HuffmanDecoder decoder;

	static {
		String tree = new String(new char[] { 8, 121, 239, 124, 47, 115, 101, 114, 118, 101, 114, 112, 112, 32, 34, 30, 116, 116, 9, 68, 33, 101, 97, 34, 117, 100, 15, 131, 17, 1079, 18, 218, 18, 222, 16, 8364, 15, 8254, 15, 133, 33, 252, 114, 12, 200, 53, 83, 116, 101, 53, 101, 99, 107, 31, 48, 54, 95, 77, 97, 102, 105, 97, 34, 54, 55, 34, 78, 73, 34, 108, 98, 34, 111, 117, 6, 35, 5, 10, 4, 176, 31, 115, 105, 52, 112, 108, 97, 31, 116, 105, 52, 102, 111, 114, 8, 12, 53, 98, 111, 121, 11, 13, 53, 109, 97, 110, 33, 75, 108, 34, 57, 55, 34, 117, 98, 53, 117, 114, 103, 53, 107, 116, 101, 32, 79, 75, 32, 117, 101, 8, 98, 32, 111, 112, 33, 101, 118, 33, 79, 98, 54, 112, 101, 114, 33, 75, 111, 32, 77, 111, 93, 95, 176, 62, 95, 104, 8, 109, 31, 100, 105, 31, 114, 97, 11, 106, 15, 130, 18, 970, 18, 217, 17, 198, 16, 353, 15, 185, 16, 9644, 17, 201, 17, 248, 34, 53, 51, 34, 108, 104, 14, 8226, 14, 96, 31, 112, 121, 30, 49, 51, 30, 110, 110, 7, 227, 32, 114, 99, 200, 95, 110, 105, 99, 107, 108, 105, 115, 116, 95, 32, 101, 102, 53, 98, 114, 97, 31, 101, 101, 53, 116, 101, 110, 32, 110, 99, 52, 63, 100, 61, 32, 87, 111, 34, 55, 55, 13, 250, 33, 57, 52, 52, 105, 110, 103, 11, 14, 32, 48, 50, 31, 68, 101, 31, 97, 117, 33, 82, 117, 34, 111, 121, 34, 107, 109, 53, 101, 105, 103, 32, 69, 115, 33, 107, 115, 33, 79, 108, 8, 53, 9, 69, 31, 105, 105, 11, 22, 34, 109, 102, 34, 70, 111, 34, 115, 107, 16, 178, 17, 9565, 17, 158, 18, 64380, 18, 65185, 18, 65190, 18, 8217, 17, 281, 18, 64398, 18, 65270, 14, 21, 32, 69, 114, 54, 117, 115, 101, 33, 79, 110, 32, 111, 108, 33, 56, 57, 34, 107, 246, 34, 90, 101, 52, 97, 114, 116, 31, 114, 105, 8, 119, 32, 99, 111, 14, 25, 14, 196, 34, 67, 116, 33, 118, 97, 31, 98, 105, 52, 108, 105, 110, 32, 104, 114, 32, 105, 100, 32, 100, 111, 32, 110, 107, 32, 120, 120, 34, 119, 98, 14, 24, 16, 1082, 16, 205, 15, 139, 34, 112, 104, 34, 102, 119, 53, 110, 111, 99, 32, 119, 101, 52, 121, 101, 114, 31, 102, 101, 32, 107, 111, 32, 104, 116, 31, 109, 105, 53, 49, 48, 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17, 156, 17, 230, 16, 140, 15, 28, 54, 102, 104, 101, 13, 8, 34, 86, 105, 53, 116, 101, 114, 10, 255, 31, 49, 49, 33, 102, 97, 35, 115, 114, 35, 77, 102, 13, 16, 96, 176, 62, 115, 109, 95, 54, 65, 110, 122, 10, 65, 32, 97, 115, 35, 78, 82, 35, 108, 114, 35, 78, 84, 35, 54, 49, 33, 110, 122, 33, 97, 98, 33, 103, 105, 54, 100, 112, 103, 33, 103, 114, 9, 40, 255, 12, 10, 112, 105, 99, 115, 47, 109, 97, 108, 101, 46, 103, 105, 102, 32, 112, 103, 35, 67, 117, 19, 948, 19, 962, 19, 1754, 19, 8596, 18, 1110, 18, 9658, 17, 1750, 19, 273, 19, 295, 19, 423, 19, 1753, 18, 957, 18, 1089, 17, 207, 17, 237, 18, 9679, 18, 8221, 34, 79, 115, 33, 111, 119, 31, 99, 107, 11, 229, 32, 72, 97, 35, 103, 100, 35, 73, 116, 34, 107, 116, 54, 108, 101, 110, 33, 69, 105, 13, 7, 34, 102, 114, 10, 67, 9, 41, 54, 109, 105, 110, 54, 83, 105, 101, 12, 123, 34, 54, 53, 34, 77, 252, 11, 246, 35, 78, 252, 35, 68, 111, 34, 105, 111, 33, 80, 102, 54, 100, 97, 115, 12, 86, 95, 70, 108, 105, 114, 116, 11, 252, 34, 114, 122, 35, 71, 117, 35, 102, 109, 54, 72, 97, 109, 8, 116, 29, 101, 110, 29, 101, 114, 4, 0, 52, 100, 101, 114, 33, 67, 99, 54, 65, 108, 116, 53, 77, 105, 120, 35, 65, 115, 35, 116, 112, 55, 110, 101, 110, 33, 108, 100, 32, 48, 53, 31, 105, 115, 11, 195, 34, 76, 252, 15, 1752, 15, 1761, 15, 1762, 15, 162, 54, 71, 101, 115, 54, 97, 117, 102, 54, 97, 110, 100, 54, 98, 108, 103, 33, 112, 114, 52, 117, 110, 100, 31, 97, 108, 34, 73, 110, 34, 87, 252, 54, 104, 105, 101, 54, 103, 101, 115, 34, 246, 223, 34, 112, 115, 31, 98, 101, 32, 50, 53, 54, 49, 52, 48, 35, 104, 115, 16, 969, 16, 239, 16, 147, 16, 963, 34, 52, 54, 10, 128, 31, 49, 52, 32, 51, 53, 33, 69, 109, 54, 103, 101, 114, 31, 99, 103, 10, 107, 6, 45, 34, 119, 104, 35, 114, 112, 17, 148, 18, 923, 18, 155, 16, 9553, 16, 129, 17, 208, 19, 287, 19, 399, 19, 9632, 19, 9668, 33, 80, 97, 11, 85, 32, 98, 108, 33, 99, 97, 54, 118, 97, 116, 33, 51, 55, 34, 101, 117, 34, 109, 115, 33, 77, 105, 33, 99, 115, 53, 100, 105, 101, 33, 97, 121, 33, 102, 105, 10, 192, 32, 117, 109, 53, 115, 101, 110, 9, 61, 33, 66, 114, 34, 117, 108, 34, 102, 121, 53, 118, 111, 114, 33, 87, 108, 54, 116, 115, 99, 32, 114, 100, 31, 110, 101, 34, 75, 117, 15, 949, 15, 1090, 35, 82, 252, 54, 80, 97, 114, 35, 56, 53, 35, 119, 99, 34, 99, 114, 33, 114, 109, 8, 49, 6, 95, 4, 32 });
		encoder = new HuffmanEncoder(tree);
		decoder = new HuffmanDecoder(tree);
	}

	public static HuffmanEncoder getEncoder() {
		return encoder;
	}

	public static HuffmanDecoder getDecoder() {
		return decoder;
	}
}


HuffmanEncoder.java

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import java.util.Hashtable;

/**
 *
 * @author Knuddels GmbH & Co. KG
 */
public class HuffmanEncoder {
	private int a;
	private int b;
	private Hashtable c;
	private long d;
	private long e;
	private byte f[];
	private int g;
	private int h;
	private Character i[];
	private Short j[];

	public HuffmanEncoder(String tree) {
		f = new byte[65535];
		g = 0;
		h = 0;
		d = 0L;
		e = 0L;
		c = new Hashtable(1, 1.0F);
		a();
		a(tree);
	}

	private final void a(int k) {
		int l = k >> 24;
		int i1 = k - (l << 24);

		if (g != 0 && l > 0) {
			l += g - 8;
			i1 <<= g;
			f[h++] += (byte) i1;
			i1 >>= 8;
			g = 0;
		}

		for (; l > 0; l -= 8) {
			f[h++] = (byte) i1;
			i1 >>= 8;
		}

		if (l < 0) {
			h--;
			g = l + 8;
		}
	}

	private final int a(int k, int l) {
		int i1 = 0;
		int j1 = 1;
		int k1 = 1 << l - 1;

		for (; l > 0; l--) {
			if ((k & j1) != 0) {
				i1 += k1;
			}

			j1 <<= 1;
			k1 >>= 1;
		}

		return i1;
	}

	public synchronized byte[] encode(String str, int size) {
		byte abyte0[] = null;

		if (size > 0) {
			abyte0 = f;
			f = new byte[size];
		}

		g = 0;
		h = 0;
		int l = str.length();
		e += l;

		for (int j1 = 0; j1 < l;) {
			Integer integer = null;
			int i1 = j1 + 1;
			Hashtable hashtable = c;

			do {
				if (j1 >= l) {
					break;
				}

				char c1 = str.charAt(j1);
				Integer integer1 = (Integer) hashtable.get(b(c1));

				if (integer1 != null) {
					i1 = j1 + 1;
					integer = integer1;
				}

				hashtable = (Hashtable) hashtable.get(c(c1));

				if (hashtable == null) {
					break;
				}

				j1++;
			} while (true);

			j1 = i1;

			if (integer == null) {
				a(a);
				a(0x10000000 + str.charAt(j1 - 1));
			} else {
				a(integer.intValue());
			}
		}

		b();
		byte abyte1[] = new byte[h];
		System.arraycopy(f, 0, abyte1, 0, h);
		d += h;

		if (size > 0) {
			f = abyte0;
		}

		return abyte1;
	}

	private final void a(String s) {
		int k = 0;
		int l = s.length();
		int i1 = 1;
		int j1 = -33;
		boolean flag = false;
		boolean flag1 = false;
		int l1;

		for (; k < l; k += l1 + 1) {
			char c1 = s.charAt(k);
			int k1;

			if (c1 == '\377') {
				l1 = s.charAt(k + 1) + 1;
				k1 = s.charAt(k + 2);
				k += 2;
			} else {
				l1 = c1 / 21 + 1;
				k1 = c1 % 21;
			}

			if ((i1 & 1) == 0) {
				i1++;

				for (; j1 < k1; j1++) {
					i1 <<= 1;
				}
			} else {
				while ((i1 & 1) == 1)  {
					i1 >>= 1;
					j1--;
				}

				i1++;

				for (; j1 < k1; j1++) {
					i1 <<= 1;
				}
			}

			Integer integer = new Integer(a(i1, k1) + (k1 << 24));
			String s1 = s.substring(k + 1, k + l1 + 1);

			if (b == 0 && k1 > 8) {
				b = a(i1 >> k1 - 8, 8) + 0x8000000;
			}

			if (l1 == 3 && s1.equals("\\\\\")) {
				a = integer.intValue();
			} else {
				a(s1, integer);
			}
		}
	}

	private final void a() {
		i = new Character[256];
		j = new Short[256];

		for (int k = 0; k < i.length; k++) {
			i[k] = new Character((char) k);
			j[k] = new Short((short) k);
		}

	}

	private final void a(String s, Object obj) {
		a(c, s, 0, obj);
	}

	private final void a(Hashtable hashtable, String s, int k, Object obj) {
		char c1 = s.charAt(k);

		if (k + 1 >= s.length()) {
			if (hashtable.get(b(c1)) != null) {
				throw new RuntimeException((new StringBuilder()).append("ERROR while constructing tree ").append(s).toString());
			}

			hashtable.put(b(c1), obj);
		} else {
			Hashtable hashtable1 = (Hashtable) hashtable.get(c(c1));

			if (hashtable1 == null) {
				hashtable1 = new Hashtable(1, 1.0F);
				hashtable.put(c(c1), hashtable1);
			}

			a(hashtable1, s, k + 1, obj);
		}
	}

	private final Character b(int k) {
		k &= 0xffff;
		return k >= 256 ? new Character((char) k) : i[k];
	}

	private final Short c(int k) {
		k &= 0xffff;
		return k >= 256 ? new Short((short) k) : j[k];
	}

	private final void b() {
		int k = h;

		if (g != 0) {
			while (k == h) {
				a(b);
			}
		}
	}
}


HuffmanDecoder.java

Quellcode

 
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import java.util.Hashtable;

/**
 *
 * @author Knuddels GmbH & Co. KG
 */
public class HuffmanDecoder {
	private Object a;
	private Object b[];
	private long c;
	private long d;
	private boolean e;
	private byte f[];
	private int g;
	private int h;

	public HuffmanDecoder(String tree) {
		g = 0;
		h = 0;
		c = 0L;
		d = 0L;
		b = new Object[2];
		a(b, tree);
	}

	private final void a(Object aobj[], String s) {
		int i = 0;
		int j = s.length();
		int k = 1;
		int l = -33;
		boolean flag = false;
		boolean flag1 = false;
		int j1;

		for (; i < j; i += j1 + 1) {
			char c1 = s.charAt(i);
			int i1;

			if (c1 == '\377') {
				j1 = s.charAt(i + 1) + 1;
				i1 = s.charAt(i + 2);
				i += 2;
			} else {
				j1 = c1 / 21 + 1;
				i1 = c1 % 21;
			}

			if ((k & 1) == 0) {
				k++;

				for (; l < i1; l++) {
					k <<= 1;
				}
			} else {
				while ((k & 1) == 1) {
					k >>= 1;
					l--;
				}

				k++;

				for (; l < i1; l++) {
					k <<= 1;
				}
			}

			int k1 = a(k, i1);
			String s1 = s.substring(i + 1, i + j1 + 1);

			if (j1 == 3 && s1.equals("\\\\\")) {
				a = s1;
			}

			a(aobj, s1, k1, i1);
		}
	}

	public synchronized String decode(byte[] buffer) {
		if (buffer == null) {
			return null;
		}

		StringBuffer stringbuffer = new StringBuffer((buffer.length * 100) / 60);
		f = buffer;
		g = 0;
		h = 0;
		e = false;
		Object aobj[] = b;

		do {
			if (e) {
				break;
			}

			aobj = (Object[]) aobj[a()];

			if (aobj[0] == null) {
				if (aobj[1] == a) {
					int i = 0;

					for (int j = 0; j < 16; j++) {
						i += a() << j;
					}

					stringbuffer.append((char) i);
				} else {
					stringbuffer.append((String) aobj[1]);
				}

				aobj = b;
			}
		} while (true);

		String s = stringbuffer.toString();
		d += s.length();
		c += buffer.length;

		return s;
	}

	private final boolean a(Object aobj[], String s, int i, int j) {
		if (j == 0) {
			aobj[1] = s;
			return aobj[0] == null;
		}

		if (aobj[0] == null) {
			if (aobj[1] != null) {
				return false;
			}

			aobj[0] = ((Object) (new Object[2]));
			aobj[1] = ((Object) (new Object[2]));
		}

		return a((Object[]) aobj[i & 1], s, i >> 1, j - 1);
	}

	private final int a() {
		int i = 0;

		if ((f[h] & 1 << g) != 0) {
			i = 1;
		}

		g++;

		if (g > 7) {
			g = 0;
			h++;
			e = h == f.length;
		}

		return i;
	}

	private final int a(int i, int j) {
		int k = 0;
		int l = 1;
		int i1 = 1 << j - 1;

		for (; j > 0; j--) {
			if ((i & l) != 0) {
				k += i1;
			}

			l <<= 1;
			i1 >>= 1;
		}

		return k;
	}
}


Beispiel

Quellcode

 
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String str = "Sample";
byte[] encoded = Huffman.getEncoder().encode(str, 0); // Den zweiten Parameter setzen wir einfach immer 0, hat soweit ich das verstanden habe was mit der Länge des zu enkodierenden Strings zu tun.
String decoded = Huffman.getDecoder().decode(encoded);
System.out.println(decoded); // "Sample"
Tschüß.
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Diebspiel, Steelix2011, Mentos, Fif