Initial git repository creation, version 0.3.1 plus changes
diff --git a/crc32.cc b/crc32.cc
new file mode 100644
index 0000000..a446ffc
--- /dev/null
+++ b/crc32.cc
@@ -0,0 +1,70 @@
+/*
+ * efone - Distributed internet phone system.
+ *
+ * (c) 1999,2000 Krzysztof Dabrowski
+ * (c) 1999,2000 ElysiuM deeZine
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+/* based on implementation by Finn Yannick Jacobs */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/* crc_tab[] -- this crcTable is being build by chksum_crc32GenTab().
+ * so make sure, you call it before using the other
+ * functions!
+ */
+u_int32_t crc_tab[256];
+
+/* chksum_crc() -- to a given block, this one calculates the
+ * crc32-checksum until the length is
+ * reached. the crc32-checksum will be
+ * the result.
+ */
+u_int32_t chksum_crc32 (unsigned char *block, unsigned int length)
+{
+ register unsigned long crc;
+ unsigned long i;
+
+ crc = 0xFFFFFFFF;
+ for (i = 0; i < length; i++)
+ {
+ crc = ((crc >> 8) & 0x00FFFFFF) ^ crc_tab[(crc ^ *block++) & 0xFF];
+ }
+ return (crc ^ 0xFFFFFFFF);
+}
+
+/* chksum_crc32gentab() -- to a global crc_tab[256], this one will
+ * calculate the crcTable for crc32-checksums.
+ * it is generated to the polynom [..]
+ */
+
+void chksum_crc32gentab ()
+{
+ unsigned long crc, poly;
+ int i, j;
+
+ poly = 0xEDB88320L;
+ for (i = 0; i < 256; i++)
+ {
+ crc = i;
+ for (j = 8; j > 0; j--)
+ {
+ if (crc & 1)
+ {
+ crc = (crc >> 1) ^ poly;
+ }
+ else
+ {
+ crc >>= 1;
+ }
+ }
+ crc_tab[i] = crc;
+ }
+}