Keep only base/extractor.[cc|h].

third_party/lzma/v4_65/files/Java/SevenZip/CRC.java

-// SevenZip/CRC.java
-
-package SevenZip;
-
-public class CRC
-{
-        static public int[] Table = new int[256];
-        
-        static
-        {
-                for (int i = 0; i < 256; i++)
-                {
-                        int r = i;
-                        for (int j = 0; j < 8; j++)
-                                if ((r & 1) != 0)
-                                        r = (r >>> 1) ^ 0xEDB88320;
-                                else
-                                        r >>>= 1;
-                        Table[i] = r;
-                }
-        }
-        
-        int _value = -1;
-        
-        public void Init()
-        {
-                _value = -1;
-        }
-        
-        public void Update(byte[] data, int offset, int size)
-        {
-                for (int i = 0; i < size; i++)
-                        _value = Table[(_value ^ data[offset + i]) & 0xFF] ^ (_value >>> 8);
-        }
-        
-        public void Update(byte[] data)
-        {
-                int size = data.length;
-                for (int i = 0; i < size; i++)
-                        _value = Table[(_value ^ data[i]) & 0xFF] ^ (_value >>> 8);
-        }
-        
-        public void UpdateByte(int b)
-        {
-                _value = Table[(_value ^ b) & 0xFF] ^ (_value >>> 8);
-        }
-        
-        public int GetDigest()
-        {
-                return _value ^ (-1);
-        }
-}