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98 lines
3.6 KiB
C#
98 lines
3.6 KiB
C#
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Universal charset detector code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Kohei TAKETA <k-tak@void.in> (Java port)
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* Rudi Pettazzi <rudi.pettazzi@gmail.com> (C# port)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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namespace UniversalDetector.Core
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{
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public class BitPackage
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{
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public static int INDEX_SHIFT_4BITS = 3;
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public static int INDEX_SHIFT_8BITS = 2;
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public static int INDEX_SHIFT_16BITS = 1;
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public static int SHIFT_MASK_4BITS = 7;
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public static int SHIFT_MASK_8BITS = 3;
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public static int SHIFT_MASK_16BITS = 1;
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public static int BIT_SHIFT_4BITS = 2;
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public static int BIT_SHIFT_8BITS = 3;
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public static int BIT_SHIFT_16BITS = 4;
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public static int UNIT_MASK_4BITS = 0x0000000F;
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public static int UNIT_MASK_8BITS = 0x000000FF;
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public static int UNIT_MASK_16BITS = 0x0000FFFF;
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private int indexShift;
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private int shiftMask;
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private int bitShift;
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private int unitMask;
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private int[] data;
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public BitPackage(int indexShift, int shiftMask,
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int bitShift, int unitMask, int[] data)
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{
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this.indexShift = indexShift;
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this.shiftMask = shiftMask;
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this.bitShift = bitShift;
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this.unitMask = unitMask;
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this.data = data;
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}
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public static int Pack16bits(int a, int b)
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{
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return ((b << 16) | a);
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}
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public static int Pack8bits(int a, int b, int c, int d)
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{
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return Pack16bits((b << 8) | a, (d << 8) | c);
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}
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public static int Pack4bits(int a, int b, int c, int d,
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int e, int f, int g, int h)
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{
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return Pack8bits((b << 4) | a, (d << 4) | c,
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(f << 4) | e, (h << 4) | g);
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}
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public int Unpack(int i)
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{
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return (data[i >> indexShift] >>
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((i & shiftMask) << bitShift)) & unitMask;
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}
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}
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}
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