64-bit CRC code.

ccan/crc/crc.c

@@ -12,6 +12,17 @@
  * Software Foundation; either version 2 of the License, or (at your option) 
  * any later version. */
 
+/* crc64 code taken from Jacksum version 1.7.0 - checksum utility in Java
+ * E-mail: jonelo@jonelo.de
+ * Copyright (C) 2001-2006 Dipl.-Inf. (FH) Johann Nepomuk Loefflmann,
+ * All Rights Reserved, http://www.jonelo.de
+ *
+ * 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.
+ */
+
 #include "crc.h"
 #include <stdbool.h>
 #include <stdlib.h>
@@ -173,3 +184,107 @@ const uint32_t *crc32_ieee_table(void)
 {
 	return crc32_ieee_tab;
 }
+
+static uint64_t crc64_tab[] = {
+    0x0000000000000000ULL, 0x01b0000000000000ULL, 0x0360000000000000ULL,
+    0x02d0000000000000ULL, 0x06c0000000000000ULL, 0x0770000000000000ULL,
+    0x05a0000000000000ULL, 0x0410000000000000ULL, 0x0d80000000000000ULL,
+    0x0c30000000000000ULL, 0x0ee0000000000000ULL, 0x0f50000000000000ULL,
+    0x0b40000000000000ULL, 0x0af0000000000000ULL, 0x0820000000000000ULL,
+    0x0990000000000000ULL, 0x1b00000000000000ULL, 0x1ab0000000000000ULL,
+    0x1860000000000000ULL, 0x19d0000000000000ULL, 0x1dc0000000000000ULL,
+    0x1c70000000000000ULL, 0x1ea0000000000000ULL, 0x1f10000000000000ULL,
+    0x1680000000000000ULL, 0x1730000000000000ULL, 0x15e0000000000000ULL,
+    0x1450000000000000ULL, 0x1040000000000000ULL, 0x11f0000000000000ULL,
+    0x1320000000000000ULL, 0x1290000000000000ULL, 0x3600000000000000ULL,
+    0x37b0000000000000ULL, 0x3560000000000000ULL, 0x34d0000000000000ULL,
+    0x30c0000000000000ULL, 0x3170000000000000ULL, 0x33a0000000000000ULL,
+    0x3210000000000000ULL, 0x3b80000000000000ULL, 0x3a30000000000000ULL,
+    0x38e0000000000000ULL, 0x3950000000000000ULL, 0x3d40000000000000ULL,
+    0x3cf0000000000000ULL, 0x3e20000000000000ULL, 0x3f90000000000000ULL,
+    0x2d00000000000000ULL, 0x2cb0000000000000ULL, 0x2e60000000000000ULL,
+    0x2fd0000000000000ULL, 0x2bc0000000000000ULL, 0x2a70000000000000ULL,
+    0x28a0000000000000ULL, 0x2910000000000000ULL, 0x2080000000000000ULL,
+    0x2130000000000000ULL, 0x23e0000000000000ULL, 0x2250000000000000ULL,
+    0x2640000000000000ULL, 0x27f0000000000000ULL, 0x2520000000000000ULL,
+    0x2490000000000000ULL, 0x6c00000000000000ULL, 0x6db0000000000000ULL,
+    0x6f60000000000000ULL, 0x6ed0000000000000ULL, 0x6ac0000000000000ULL,
+    0x6b70000000000000ULL, 0x69a0000000000000ULL, 0x6810000000000000ULL,
+    0x6180000000000000ULL, 0x6030000000000000ULL, 0x62e0000000000000ULL,
+    0x6350000000000000ULL, 0x6740000000000000ULL, 0x66f0000000000000ULL,
+    0x6420000000000000ULL, 0x6590000000000000ULL, 0x7700000000000000ULL,
+    0x76b0000000000000ULL, 0x7460000000000000ULL, 0x75d0000000000000ULL,
+    0x71c0000000000000ULL, 0x7070000000000000ULL, 0x72a0000000000000ULL,
+    0x7310000000000000ULL, 0x7a80000000000000ULL, 0x7b30000000000000ULL,
+    0x79e0000000000000ULL, 0x7850000000000000ULL, 0x7c40000000000000ULL,
+    0x7df0000000000000ULL, 0x7f20000000000000ULL, 0x7e90000000000000ULL,
+    0x5a00000000000000ULL, 0x5bb0000000000000ULL, 0x5960000000000000ULL,
+    0x58d0000000000000ULL, 0x5cc0000000000000ULL, 0x5d70000000000000ULL,
+    0x5fa0000000000000ULL, 0x5e10000000000000ULL, 0x5780000000000000ULL,
+    0x5630000000000000ULL, 0x54e0000000000000ULL, 0x5550000000000000ULL,
+    0x5140000000000000ULL, 0x50f0000000000000ULL, 0x5220000000000000ULL,
+    0x5390000000000000ULL, 0x4100000000000000ULL, 0x40b0000000000000ULL,
+    0x4260000000000000ULL, 0x43d0000000000000ULL, 0x47c0000000000000ULL,
+    0x4670000000000000ULL, 0x44a0000000000000ULL, 0x4510000000000000ULL,
+    0x4c80000000000000ULL, 0x4d30000000000000ULL, 0x4fe0000000000000ULL,
+    0x4e50000000000000ULL, 0x4a40000000000000ULL, 0x4bf0000000000000ULL,
+    0x4920000000000000ULL, 0x4890000000000000ULL, 0xd800000000000000ULL,
+    0xd9b0000000000000ULL, 0xdb60000000000000ULL, 0xdad0000000000000ULL,
+    0xdec0000000000000ULL, 0xdf70000000000000ULL, 0xdda0000000000000ULL,
+    0xdc10000000000000ULL, 0xd580000000000000ULL, 0xd430000000000000ULL,
+    0xd6e0000000000000ULL, 0xd750000000000000ULL, 0xd340000000000000ULL,
+    0xd2f0000000000000ULL, 0xd020000000000000ULL, 0xd190000000000000ULL,
+    0xc300000000000000ULL, 0xc2b0000000000000ULL, 0xc060000000000000ULL,
+    0xc1d0000000000000ULL, 0xc5c0000000000000ULL, 0xc470000000000000ULL,
+    0xc6a0000000000000ULL, 0xc710000000000000ULL, 0xce80000000000000ULL,
+    0xcf30000000000000ULL, 0xcde0000000000000ULL, 0xcc50000000000000ULL,
+    0xc840000000000000ULL, 0xc9f0000000000000ULL, 0xcb20000000000000ULL,
+    0xca90000000000000ULL, 0xee00000000000000ULL, 0xefb0000000000000ULL,
+    0xed60000000000000ULL, 0xecd0000000000000ULL, 0xe8c0000000000000ULL,
+    0xe970000000000000ULL, 0xeba0000000000000ULL, 0xea10000000000000ULL,
+    0xe380000000000000ULL, 0xe230000000000000ULL, 0xe0e0000000000000ULL,
+    0xe150000000000000ULL, 0xe540000000000000ULL, 0xe4f0000000000000ULL,
+    0xe620000000000000ULL, 0xe790000000000000ULL, 0xf500000000000000ULL,
+    0xf4b0000000000000ULL, 0xf660000000000000ULL, 0xf7d0000000000000ULL,
+    0xf3c0000000000000ULL, 0xf270000000000000ULL, 0xf0a0000000000000ULL,
+    0xf110000000000000ULL, 0xf880000000000000ULL, 0xf930000000000000ULL,
+    0xfbe0000000000000ULL, 0xfa50000000000000ULL, 0xfe40000000000000ULL,
+    0xfff0000000000000ULL, 0xfd20000000000000ULL, 0xfc90000000000000ULL,
+    0xb400000000000000ULL, 0xb5b0000000000000ULL, 0xb760000000000000ULL,
+    0xb6d0000000000000ULL, 0xb2c0000000000000ULL, 0xb370000000000000ULL,
+    0xb1a0000000000000ULL, 0xb010000000000000ULL, 0xb980000000000000ULL,
+    0xb830000000000000ULL, 0xbae0000000000000ULL, 0xbb50000000000000ULL,
+    0xbf40000000000000ULL, 0xbef0000000000000ULL, 0xbc20000000000000ULL,
+    0xbd90000000000000ULL, 0xaf00000000000000ULL, 0xaeb0000000000000ULL,
+    0xac60000000000000ULL, 0xadd0000000000000ULL, 0xa9c0000000000000ULL,
+    0xa870000000000000ULL, 0xaaa0000000000000ULL, 0xab10000000000000ULL,
+    0xa280000000000000ULL, 0xa330000000000000ULL, 0xa1e0000000000000ULL,
+    0xa050000000000000ULL, 0xa440000000000000ULL, 0xa5f0000000000000ULL,
+    0xa720000000000000ULL, 0xa690000000000000ULL, 0x8200000000000000ULL,
+    0x83b0000000000000ULL, 0x8160000000000000ULL, 0x80d0000000000000ULL,
+    0x84c0000000000000ULL, 0x8570000000000000ULL, 0x87a0000000000000ULL,
+    0x8610000000000000ULL, 0x8f80000000000000ULL, 0x8e30000000000000ULL,
+    0x8ce0000000000000ULL, 0x8d50000000000000ULL, 0x8940000000000000ULL,
+    0x88f0000000000000ULL, 0x8a20000000000000ULL, 0x8b90000000000000ULL,
+    0x9900000000000000ULL, 0x98b0000000000000ULL, 0x9a60000000000000ULL,
+    0x9bd0000000000000ULL, 0x9fc0000000000000ULL, 0x9e70000000000000ULL,
+    0x9ca0000000000000ULL, 0x9d10000000000000ULL, 0x9480000000000000ULL,
+    0x9530000000000000ULL, 0x97e0000000000000ULL, 0x9650000000000000ULL,
+    0x9240000000000000ULL, 0x93f0000000000000ULL, 0x9120000000000000ULL,
+    0x9090000000000000ULL
+};
+
+uint64_t crc64_iso(uint64_t crc, const void *buf, size_t size)
+{
+	const uint8_t *p = buf;
+
+	while (size--)
+		crc = crc64_tab[(crc ^ *p++) & 0xFFL] ^ (crc >> 8);
+
+	return crc;
+}
+
+const uint64_t *crc64_iso_table(void)
+{
+	return crc64_tab;
+}

ccan/crc/crc.h

@@ -55,7 +55,7 @@ uint32_t crc32c(uint32_t start_crc, const void *buf, size_t size);
  *	void check_user_crc_table(const uint32_t *usertab)
  *	{
  *		const uint32_t *ctab = crc32c_table();
- *		if (!ieee_tab || memcmp(ieee_tab, usertab, 1024) != 0)
+ *		if (!ctab || memcmp(ctab, usertab, 1024) != 0)
  *			abort();
  *	}
  */
@@ -80,4 +80,25 @@ uint32_t crc32_ieee(uint32_t start_crc, const void *buf, size_t size);
  * See crc32c_table() for details.
  */
 const uint32_t *crc32_ieee_table(void);
+
+/**
+ * crc64_iso - ISO 3309
+ * @start_crc: the initial crc (usually 0)
+ * @buf: pointer to bytes
+ * @size: length of buffer
+ *
+ * 64 bit CRC checksum using polynomial
+ * X^64 + X^4 + X^3 + X^1 + X^0
+ *
+ * See crc32c() for details.
+ */
+uint64_t crc64_iso(uint64_t start_crc, const void *buf, size_t size);
+
+/**
+ * crc64_iso_table - Get the ISO 3309 CRC table
+ *
+ * See crc32c_table() for details.
+ */
+const uint64_t *crc64_iso_table(void);
+
 #endif /* CCAN_CRC_H */

ccan/crc/test/api.c

@@ -238,12 +238,24 @@ static void test_crc32(uint32_t (*crc)(uint32_t, const void *, size_t),
 	ok1(memcmp(crc_table(), table_expect, 1024) == 0);
 }
 
+static void test_crc64(void)
+{
+	/* according to http://swissknife.sourceforge.net/CRC64.html */
+	ok1(crc64_iso(0, "IHATEMATH", strlen("IHATEMATH"))
+	    == 0xE3DCADD69B01ADD1ULL);
+
+	/* according to the CRC64 poly, http://sf.net/projects/jcrcgen */
+	ok1(crc64_iso(0, "123456789", strlen("123456789"))
+	    == 0x46A5A9388A5BEFFEULL);
+}
+
 int main(int argc, char *argv[])
 {
-	plan_tests(517 * 2);
+	plan_tests(517 * 2 + 2);
 	test_crc32(crc32c, crc32c_table,
 		   crcc_zero_expect, crcc_expect, crc32c_tab);
 	test_crc32(crc32_ieee, crc32_ieee_table,
 		   crc_ieee_zero_expect, crc_ieee_expect, crc32_ieee_tab);
+	test_crc64();
 	return exit_status();
 }