Initial creation of sourceware repository

gdb/rdi-share/crc.h

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+/* 
+ * Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved.
+ * 
+ * This software may be freely used, copied, modified, and distributed
+ * provided that the above copyright notice is preserved in all copies of the
+ * software.
+ */
+
+/* -*-C-*-
+ *
+ * $Revision$
+ *     $Date$
+ *
+ *
+ * crc.h - describes some "standard" CRC calculation routines.
+ */
+#ifndef angel_crc_h
+#define angel_crc_h
+
+/*
+ * manifests
+ */
+
+/*
+ * When using "crc32" or "crc16" these initial CRC values must be given to
+ * the respective function the first time it is called. The function can
+ * then be called with the return value from the last call of the function
+ * to generate a running CRC over multiple data blocks.
+ * When the last data block has been processed using the "crc32" algorithm
+ * the CRC value should be inverted to produce the final CRC value:
+ * e.g. CRC = ~CRC
+ */
+
+#define startCRC32  (0xFFFFFFFF)    /* CRC initialised to all 1s */
+#define startCRC16  (0x0000)        /* CRC initialised to all 0s */
+
+/*
+ * For the CRC-32 residual to be calculated correctly requires that the CRC
+ * value is in memory little-endian due to the byte read, bit-ordering
+ * nature of the algorithm.
+ */
+#define CRC32residual   (0xDEBB20E3)    /* good CRC-32 residual */
+
+
+/**********************************************************************/
+
+/*
+ * exported functions
+ */
+
+/*
+ *  Function: crc32
+ *   Purpose: Provides a table driven implementation of the IEEE-802.3
+ *            32-bit CRC algorithm for byte data.
+ *
+ *    Params:
+ *       Input: address     pointer to the byte data
+ *              size        number of bytes of data to be processed
+ *              crc         initial CRC value to be used (can be the output
+ *                          from a previous call to this function).
+ *   Returns:
+ *          OK: 32-bit CRC value for the specified data
+ */
+extern unsigned int crc32(unsigned char *address, unsigned int size,
+                          unsigned int crc);
+
+/**********************************************************************/
+
+/*
+ *
+ *  Function: crc16
+ *   Purpose: Generates a table driven 16-bit CRC-CCITT for byte data
+ *
+ *    Params:
+ *       Input: address     pointer to the byte data
+ *              size        number of bytes of data to be processed
+ *              crc         initial CRC value to be used (can be the output
+ *                          from a previous call to this function).
+ *
+ *   Returns:
+ *          OK: 16-bit CRC value for the specified data
+ */
+extern unsigned short crc16(unsigned char *address, unsigned int size,
+                            unsigned short crc);
+
+/**********************************************************************/
+
+#endif /* !defined(angel_crc_h) */
+
+/* EOF crc.h */