diff options
Diffstat (limited to 'other-licenses/7zstub/src/Java/SevenZip/CRC.java')
| -rw-r--r-- | other-licenses/7zstub/src/Java/SevenZip/CRC.java | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/Java/SevenZip/CRC.java b/other-licenses/7zstub/src/Java/SevenZip/CRC.java new file mode 100644 index 0000000000..f2f791f17a --- /dev/null +++ b/other-licenses/7zstub/src/Java/SevenZip/CRC.java @@ -0,0 +1,52 @@ +// 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);
+ }
+}
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