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engines/wintermute/utils/crc.h

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+/**********************************************************************
+ *
+ * Filename:    crc.h
+ *
+ * Description: A header file describing the various CRC standards.
+ *
+ * Notes:
+ *
+ *
+ * Copyright (c) 2000 by Michael Barr.  This software is placed into
+ * the public domain and may be used for any purpose.  However, this
+ * notice must not be changed or removed and no warranty is either
+ * expressed or implied by its publication or distribution.
+ **********************************************************************/
+
+#ifndef _crc_h
+#define _crc_h
+
+#include "common/system.h" // For types.
+
+namespace Wintermute {
+
+#ifndef TRUE
+#define FALSE   0
+#define TRUE    !FALSE
+#endif
+
+/*
+ * Select the CRC standard from the list that follows.
+ */
+#define CRC32
+
+#if defined(CRC_CCITT)
+
+typedef uint16  crc;
+
+#define CRC_NAME            "CRC-CCITT"
+#define POLYNOMIAL          0x1021
+#define INITIAL_REMAINDER   0xFFFF
+#define FINAL_XOR_VALUE     0x0000
+#define REFLECT_DATA        FALSE
+#define REFLECT_REMAINDER   FALSE
+#define CHECK_VALUE         0x29B1
+
+#elif defined(CRC16)
+
+typedef uint16  crc;
+
+#define CRC_NAME            "CRC-16"
+#define POLYNOMIAL          0x8005
+#define INITIAL_REMAINDER   0x0000
+#define FINAL_XOR_VALUE     0x0000
+#define REFLECT_DATA        TRUE
+#define REFLECT_REMAINDER   TRUE
+#define CHECK_VALUE         0xBB3D
+
+#elif defined(CRC32)
+
+typedef uint32  crc;
+
+#define CRC_NAME            "CRC-32"
+#define POLYNOMIAL          0x04C11DB7
+#define INITIAL_REMAINDER   0xFFFFFFFF
+#define FINAL_XOR_VALUE     0xFFFFFFFF
+#define REFLECT_DATA        TRUE
+#define REFLECT_REMAINDER   TRUE
+#define CHECK_VALUE         0xCBF43926
+
+#else
+
+#error "One of CRC_CCITT, CRC16, or CRC32 must be #define'd."
+
+#endif
+
+void  crcInit();
+crc   crcSlow(unsigned char const message[], int nBytes);
+crc   crcFast(unsigned char const message[], int nBytes);
+
+extern "C" crc crc_initialize();
+extern "C" crc crc_process_byte(unsigned char byteVal, crc remainder);
+extern "C" crc crc_finalize(crc remainder);
+
+} // End of namespace Wintermute
+
+#endif /* _crc_h */