--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/misc/crc32.h	Wed Jan 16 22:39:43 2008 +0100
@@ -0,0 +1,48 @@
+/*********************************** CRC32 ***********************************/
+
+/* Use a type crc32_t variable to store the crc value.
+ * Initialise the variable to CRC32INIT before running the crc routine.
+ * for more details see the CRC32.C file */
+
+#ifndef CRC32INIT
+#define CRC32INIT 0xFFFFFFFFL /* the initializer for the 32-bit CRC */
+
+typedef unsigned long crc32_t; /* the type of the 32-bit CRC */
+
+extern const crc32_t crc32tab[]; /* a table of 32-bit CRC feedback terms */
+
+#ifdef __cplusplus
+
+inline crc32_t crc32_update (const crc32_t crc, const unsigned char octet)
+{
+  return crc32tab [(unsigned char) crc ^ octet] ^ ((crc >> 8) & 0x00FFFFFFL);
+}
+
+class crc32_c
+{
+private:
+  crc32_t val;
+public:
+  inline crc32_c (const crc32_t v = 0L) : val (v ^ CRC32INIT) {}
+  inline void init () { val = CRC32INIT; }
+  inline operator crc32_t () const { return val ^ CRC32INIT; }
+  inline crc32_t operator = (const crc32_c &n) {
+    return (val = n.val) ^ CRC32INIT;
+  }
+  inline crc32_t operator = (const crc32_t &n) {
+    return val = n ^ CRC32INIT, n;
+  }
+  inline void update (const unsigned char octet) {
+    val = crc32_update (val, octet);
+  }
+  crc32_t update (const unsigned char *block, int len);
+  inline crc32_t update (const char* block, int len) {
+    return update((const unsigned char*)block, len);
+  }
+};
+#else
+#define crc32_update(crc32,octet) ( crc32 = crc32tab[(unsigned char)(crc32) ^ \
+        (unsigned char)(octet) ] ^ ( ((crc32)>>8) & 0x00FFFFFFL ) )
+#endif
+
+#endif CRC32INIT