From 124f869faae3a0f75a3825e6a8e195c17f3c626a Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <noreply@fakecake.org>
Date: Thu, 16 Oct 2014 23:34:20 +0400
Subject: initial for idea

---
 .../main/java/com/github/junrar/crc/RarCRC.java    | 145 +++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 org.fox.ttcomics/src/main/java/com/github/junrar/crc/RarCRC.java

(limited to 'org.fox.ttcomics/src/main/java/com/github/junrar/crc/RarCRC.java')

diff --git a/org.fox.ttcomics/src/main/java/com/github/junrar/crc/RarCRC.java b/org.fox.ttcomics/src/main/java/com/github/junrar/crc/RarCRC.java
new file mode 100644
index 0000000..8a778ed
--- /dev/null
+++ b/org.fox.ttcomics/src/main/java/com/github/junrar/crc/RarCRC.java
@@ -0,0 +1,145 @@
+/*
+ * Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
+ * Original author: Edmund Wagner
+ * Creation date: 29.05.2007
+ *
+ * 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:
+ * "&":  "&#038;" or "&amp;"
+ * "<":  "&#060;" or "&lt;"
+ * ">":  "&#062;" or "&gt;"
+ * "@":  "&#064;" 
+ */
+package com.github.junrar.crc;
+
+
+/**
+ * DOCUMENT ME
+ * 
+ * @author $LastChangedBy$
+ * @version $LastChangedRevision$
+ */
+public class RarCRC {
+	
+	private final static int crcTab[];
+    static {
+		crcTab = new int[256];
+		for (int i = 0; i < 256; i++) {
+			int c = i;
+			for (int j = 0; j < 8; j++){
+				if ((c & 1) !=0) {
+					c >>>= 1;
+					c ^= 0xEDB88320;
+				}
+                else{
+					c >>>= 1;
+				}
+			}
+			crcTab[i] = c;
+		}
+    }
+
+	private RarCRC() {
+	}
+
+	public static int checkCrc(int startCrc, byte[] data, int offset,
+            int count) {
+		int size = Math.min(data.length-offset,count);
+		// #if defined(LITTLE_ENDIAN) && defined(PRESENT_INT32) &&
+		// defined(ALLOW_NOT_ALIGNED_INT)
+		/*
+		for (int i = 0; (0 < size) && i < data.length - 8
+				&& ((data[i + 8] & 7) != 0); i++) {
+			startCrc = crcTab[(short) (startCrc ^ data[i]) & 0x00FF] ^ (startCrc >>> 8);
+			size--;
+		}
+		
+		for (int i = 0; size >= 8; i += 8) {
+			startCrc ^= data[i + 0] << 24;
+			startCrc ^= data[i + 1] << 16;
+			startCrc ^= data[i + 2] << 8;
+			startCrc ^= data[i + 3];
+
+			startCrc = crcTab[(short) startCrc & 0x00FF] ^ (startCrc >>> 8);
+			startCrc = crcTab[(short) startCrc & 0x00FF] ^ (startCrc >>> 8);
+			startCrc = crcTab[(short) startCrc & 0x00FF] ^ (startCrc >>> 8);
+			startCrc = crcTab[(short) startCrc & 0x00FF] ^ (startCrc >>> 8);
+
+			startCrc ^= data[i + 4] << 24;
+			startCrc ^= data[i + 5] << 16;
+			startCrc ^= data[i + 6] << 8;
+			startCrc ^= data[i + 7];
+			startCrc = crcTab[(short) startCrc & 0x00FF] ^ (startCrc >>> 8);
+			startCrc = crcTab[(short) startCrc & 0x00FF] ^ (startCrc >>> 8);
+			startCrc = crcTab[(short) startCrc & 0x00FF] ^ (startCrc >>> 8);
+			startCrc = crcTab[(short) startCrc & 0x00FF] ^ (startCrc >>> 8);
+			size -= 8;
+		}*/
+		
+		for (int i = 0; i < size; i++)
+		{
+/*
+			// (byte)(StartCRC^Data[I])
+			int pos = 0; // pos=0x00000000
+			pos |= startCrc; // pos=ffffffff
+			
+			pos ^= data[i]; // data[0]=0x73=115dec --> pos=140
+			System.out.println(Integer.toHexString(pos));
+			
+			// Only last 8 bit because CRCtab has length 256
+			pos = pos & 0x000000FF;
+			System.out.println("pos:"+pos);
+			//startCrc >>>= 8;
+			
+			
+			//StartCRC>>8
+			int temp =0;
+			temp|=startCrc;
+			temp >>>= 8;
+			System.out.println("temp:"+Integer.toHexString(temp));
+			
+			
+			startCrc = (crcTab[pos]^temp);
+			System.out.println("--"+Integer.toHexString(startCrc));*/
+			
+			startCrc=(crcTab[((int)((int)startCrc ^
+                    (int)data[offset+i]))&0xff]^(startCrc>>>8));
+			
+			//System.out.println(Integer.toHexString(startCrc));
+			
+			// Original code:
+			//StartCRC=CRCTab[(byte)(StartCRC^Data[I])]^(StartCRC>>8);
+		}
+		return (startCrc);
+	}
+
+	public static short checkOldCrc(short startCrc, byte[] data, int count) {
+        int n = Math.min(data.length, count);
+		for (int i = 0; i < n; i++) {
+			startCrc = (short) ((short) (startCrc + (short) (data[i]&0x00ff)) & -1);
+			startCrc = (short) (((startCrc << 1) | (startCrc >>> 15)) & -1);
+		}
+		return (startCrc);
+	}
+
+//	public static void main(String[] args)
+//	{
+//		RarCRC rc = new RarCRC();
+//		//byte[] data = { 0x72, 0x21, 0x1A, 0x07, 0x00};
+//		
+//		byte[] data = {0x73 ,0x00 ,0x00 ,0x0D ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00};
+//		
+//		int crc = 0x90CF;
+//		
+//
+//		int result = rc.checkCrc(0xFFFFffff, data,0,data.length);
+//		System.out.println("3: "+Integer.toHexString(~result&0xffff));
+//		
+//	}
+	
+}
-- 
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