diff options
Diffstat (limited to 'src/com/github/junrar/unpack/ppm/RangeCoder.java')
| -rw-r--r-- | src/com/github/junrar/unpack/ppm/RangeCoder.java | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/src/com/github/junrar/unpack/ppm/RangeCoder.java b/src/com/github/junrar/unpack/ppm/RangeCoder.java deleted file mode 100644 index 734813f..0000000 --- a/src/com/github/junrar/unpack/ppm/RangeCoder.java +++ /dev/null @@ -1,177 +0,0 @@ -/*
- * Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
- * Original author: Edmund Wagner
- * Creation date: 31.05.2007
- *
- * Source: $HeadURL$
- * Last changed: $LastChangedDate$
- *
- * the unrar licence applies to all junrar source and binary distributions
- * you are not allowed to use this source to re-create the RAR compression algorithm
- *
- * Here some html entities which can be used for escaping javadoc tags:
- * "&": "&" or "&"
- * "<": "<" or "<"
- * ">": ">" or ">"
- * "@": "@"
- */
-package com.github.junrar.unpack.ppm;
-
-import java.io.IOException;
-
-import com.github.junrar.exception.RarException;
-import com.github.junrar.unpack.Unpack;
-
-
-/**
- * DOCUMENT ME
- *
- * @author $LastChangedBy$
- * @version $LastChangedRevision$
- */
-public class RangeCoder
-{
- public static final int TOP = 1 << 24;
-
- public static final int BOT = 1 << 15;
-
- private static final long uintMask = 0xFFFFffffL;
-
- // uint low, code, range;
- private long low, code, range;
-
- private final SubRange subRange = new SubRange();
-
- private Unpack unpackRead;
-
- public SubRange getSubRange()
- {
- return subRange;
- }
-
- public void initDecoder(Unpack unpackRead) throws IOException, RarException
- {
- this.unpackRead = unpackRead;
-
- low = code = 0L;
- range = 0xFFFFffffL;
- for (int i = 0; i < 4; i++) {
- code = ((code << 8) | getChar())&uintMask;
- }
- }
-
- public int getCurrentCount()
- {
- range = (range / subRange.getScale())&uintMask;
- return (int)((code - low) / (range));
- }
-
- public long getCurrentShiftCount(int SHIFT)
- {
- range = range >>>SHIFT;
- return ((code - low) / (range))&uintMask;
- }
-
- public void decode()
- {
- low = (low + (range * subRange.getLowCount()))&uintMask;
- range = (range * (subRange.getHighCount() - subRange.getLowCount()))&uintMask;
- }
-
- private int getChar() throws IOException, RarException
- {
- return (unpackRead.getChar());
- }
-
- public void ariDecNormalize() throws IOException, RarException
- {
-// while ((low ^ (low + range)) < TOP || range < BOT && ((range = -low & (BOT - 1)) != 0 ? true : true))
-// {
-// code = ((code << 8) | unpackRead.getChar()&0xff)&uintMask;
-// range = (range << 8)&uintMask;
-// low = (low << 8)&uintMask;
-// }
-
- // Rewrote for clarity
- boolean c2 = false;
- while ((low ^ (low + range)) < TOP || (c2 = range < BOT)) {
- if (c2) {
- range = (-low & (BOT - 1))&uintMask;
- c2 = false;
- }
- code = ((code << 8) | getChar())&uintMask;
- range = (range << 8)&uintMask;
- low = (low << 8)&uintMask;
- }
- }
-
- // Debug
- public String toString() {
- StringBuilder buffer = new StringBuilder();
- buffer.append("RangeCoder[");
- buffer.append("\n low=");
- buffer.append(low);
- buffer.append("\n code=");
- buffer.append(code);
- buffer.append("\n range=");
- buffer.append(range);
- buffer.append("\n subrange=");
- buffer.append(subRange);
- buffer.append("]");
- return buffer.toString();
- }
-
- public static class SubRange
- {
- // uint LowCount, HighCount, scale;
- private long lowCount, highCount, scale;
-
- public long getHighCount()
- {
- return highCount;
- }
-
- public void setHighCount(long highCount)
- {
- this.highCount = highCount&uintMask;
- }
-
- public long getLowCount()
- {
- return lowCount&uintMask;
- }
-
- public void setLowCount(long lowCount)
- {
- this.lowCount = lowCount&uintMask;
- }
-
- public long getScale()
- {
- return scale;
- }
-
- public void setScale(long scale)
- {
- this.scale = scale&uintMask;
- }
-
- public void incScale(int dScale) {
- setScale(getScale() + dScale);
- }
-
- // Debug
- public String toString() {
- StringBuilder buffer = new StringBuilder();
- buffer.append("SubRange[");
- buffer.append("\n lowCount=");
- buffer.append(lowCount);
- buffer.append("\n highCount=");
- buffer.append(highCount);
- buffer.append("\n scale=");
- buffer.append(scale);
- buffer.append("]");
- return buffer.toString();
- }
- }
-}
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