[Joafip-svn] SF.net SVN: joafip:[3067] trunk/joafip-kvstore/src/main/java/net/sf/joafip/ kvstore/entity/AbstractFileStorable.java

[<luc...@us...>]

Revision: 3067
          http://joafip.svn.sourceforge.net/joafip/?rev=3067&view=rev
Author:   luc_peuvrier
Date:     2012-05-04 16:18:55 +0000 (Fri, 04 May 2012)
Log Message:
-----------
WIP btree plus: tests OK : WIP check and optimization : update crc32 change

Modified Paths:
--------------
    trunk/joafip-kvstore/src/main/java/net/sf/joafip/kvstore/entity/AbstractFileStorable.java

Modified: trunk/joafip-kvstore/src/main/java/net/sf/joafip/kvstore/entity/AbstractFileStorable.java
===================================================================
--- trunk/joafip-kvstore/src/main/java/net/sf/joafip/kvstore/entity/AbstractFileStorable.java	2012-05-04 05:07:30 UTC (rev 3066)
+++ trunk/joafip-kvstore/src/main/java/net/sf/joafip/kvstore/entity/AbstractFileStorable.java	2012-05-04 16:18:55 UTC (rev 3067)
@@ -200,7 +200,8 @@
 
 	}
 
-	private void updateCrc32(final byte byteValue) {
+	@SuppressWarnings("unused")
+	private void _updateCrc32(final byte byteValue) {
 		int value = byteValue;
 		for (int j = 0; j < 8; j++) {
 			final int testbit = ((crc32 >> 31) & 1) ^ (value & 1);
@@ -212,6 +213,59 @@
 		}
 	}
 
+	private void updateCrc32(final byte byteValue) {
+		int crc32=this.crc32;
+		if ((crc32 & 0x80000000) == 0x80000000 ^ (byteValue & 0x01) == 0x01) {
+			crc32 <<= 2;
+			crc32 ^= 0x8005; /* 32 bit crc */
+		} else {
+			crc32 <<= 2;
+		}
+		if ((crc32 & 0x80000000) == 0x80000000 ^ (byteValue & 0x02) == 0x02) {
+			crc32 <<= 2;
+			crc32 ^= 0x8005; /* 32 bit crc */
+		} else {
+			crc32 <<= 2;
+		}
+		if ((crc32 & 0x80000000) == 0x80000000 ^ (byteValue & 0x04) == 0x04) {
+			crc32 <<= 2;
+			crc32 ^= 0x8005; /* 32 bit crc */
+		} else {
+			crc32 <<= 2;
+		}
+		if ((crc32 & 0x80000000) == 0x80000000 ^ (byteValue & 0x08) == 0x08) {
+			crc32 <<= 2;
+			crc32 ^= 0x8005; /* 32 bit crc */
+		} else {
+			crc32 <<= 2;
+		}
+		if ((crc32 & 0x80000000) == 0x80000000 ^ (byteValue & 0x10) == 0x10) {
+			crc32 <<= 2;
+			crc32 ^= 0x8005; /* 32 bit crc */
+		} else {
+			crc32 <<= 2;
+		}
+		if ((crc32 & 0x80000000) == 0x80000000 ^ (byteValue & 0x20) == 0x20) {
+			crc32 <<= 2;
+			crc32 ^= 0x8005; /* 32 bit crc */
+		} else {
+			crc32 <<= 2;
+		}
+		if ((crc32 & 0x80000000) == 0x80000000 ^ (byteValue & 0x40) == 0x40) {
+			crc32 <<= 2;
+			crc32 ^= 0x8005; /* 32 bit crc */
+		} else {
+			crc32 <<= 2;
+		}
+		if ((crc32 & 0x80000000) == 0x80000000 ^ (byteValue & 0x80) == 0x80) {
+			crc32 <<= 2;
+			crc32 ^= 0x8005; /* 32 bit crc */
+		} else {
+			crc32 <<= 2;
+		}
+		this.crc32=crc32;
+	}
+
 	protected void clearCrc32() {
 		crc32 = 0;
 	}

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