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+/*
+ * CRC32
+ * Written by Julien Couot.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+/**
+ * \file crc32.h
+ * Compute crc32.
+ */
+
+#ifndef CRC32_H
+#define CRC32_H
+
+//---------------------------------------------------------------------------
+// For compilers that support precompilation, includes "wx.h".
+#include <wx/wxprec.h>
+
+#ifdef __BORLANDC__
+#pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+// Include your minimal set of headers here, or wx.h
+#include <wx/wx.h>
+#endif
+
+//---------------------------------------------------------------------------
+
+
+/**
+ * Computes the CRC-32 from a byte stream.
+ *
+ * This class is writen with the code found in
+ * <A HREF="http://www.fodder.org/cksfv/">cksfv</A> and
+ * <A HREF="http://www.gzip.org/zlib/">zlib</A> code.
+ *
+ * Using this class in very simple:<BR>
+ * Use the @link update(const wxByte* buf, unsigned int len) update @endlink
+ * method to provide to the class the bytes for computing the checksum.
+ *
+ * The CRC-32 checksum value can be gotten by the @link getValue(const bool) const
+ * getValue @endlink method which puts the CRC32 checksum value in a
+ * unsigned 32 bits integer.
+ *
+ * The CRC32 checksum computing can be reseted by the @link reset() reset
+ * @endlink method.
+ */
+class CRC32
+{
+ protected:
+  /// Table used to compute the CRC32 value.
+  static const wxUint32 crc_table[256];
+
+  /// The current CRC32 value.
+  wxUint32 crc32;
+
+ public:
+  /**
+   * Default constructor.
+   */
+  CRC32();
+
+  /**
+   * Resets the CRC32 to initial value.
+   */
+  void reset();
+
+  /**
+   * Returns the CRC32 value.
+   *
+   * @return The current checksum value.
+   */
+  wxUint32 getUint32Value() const;
+
+  /**
+   * Returns the CRC32 value in a string.
+   *
+   * @param  hexInUpperCase  If <CODE>true</CODE> the hexadecimal letters will
+   *                         be in uppercase.
+   * @return The current CRC32 value.
+   */
+  wxString getValue(const bool hexInUpperCase = false) const;
+
+  /**
+   * Updates the CRC32 with specified array of bytes.
+   *
+   * @param  buf  The byte array to update the CRC32 with.
+   * @param  len  The number of bytes to use for the update.
+   */
+  void update(const wxByte *buf, unsigned int len);
+};
+//---------------------------------------------------------------------------
+
+#endif