8.3

1 files changed, 48 insertions, 0 deletions

diff --git a/zen/crc.h b/zen/crc.h
new file mode 100644
index 00000000..0b22c7c3
--- /dev/null
+++ b/zen/crc.h
@@ -0,0 +1,48 @@
+// **************************************************************************
+// * This file is part of the FreeFileSync project. It is distributed under *
+// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0        *
+// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved        *
+// **************************************************************************
+
+#ifndef CRC_H_23489275827847235
+#define CRC_H_23489275827847235
+
+#ifdef _MSC_VER
+    #pragma warning(push)
+    #pragma warning(disable: 4245) //'conversion' : conversion from 'int' to 'const boost::detail::mask_uint_t<0x08>::least', signed/unsigned mismatch
+#endif
+#include <boost/crc.hpp>
+#ifdef _MSC_VER
+    #pragma warning(pop)
+#endif
+
+
+namespace zen
+{
+template <class ByteIterator> inline
+uint16_t getCrc16(ByteIterator first, ByteIterator last)
+{
+    static_assert(sizeof(typename std::iterator_traits<ByteIterator>::value_type) == 1, "");
+    boost::crc_16_type result;
+    if (first != last)
+        result.process_bytes(&*first, last - first);
+    auto rv = result.checksum();
+    static_assert(sizeof(rv) == sizeof(uint16_t), "");
+    return rv;
+}
+
+
+template <class ByteIterator> inline
+uint32_t getCrc32(ByteIterator first, ByteIterator last)
+{
+    static_assert(sizeof(typename std::iterator_traits<ByteIterator>::value_type) == 1, "");
+    boost::crc_32_type result;
+    if (first != last)
+		result.process_bytes(&*first, last - first);
+    auto rv = result.checksum();
+    static_assert(sizeof(rv) == sizeof(uint32_t), "");
+    return rv;
+}
+}
+
+#endif //CRC_H_23489275827847235