X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fcrc%2Fcrc.c;h=01b0f4af874cc08b6a7bf18596e419c036ede9c0;hp=9fbb907d7ae2c44a4e2c41d7db064ede3ff679ff;hb=4f14d7bbd5afcda4fd0f1f70e8c9aae2a929c4d4;hpb=456d13116b61c1a9fa2ace8816dbbe9b759ac9e2

diff --git a/ccan/crc/crc.c b/ccan/crc/crc.c
index 9fbb907d..01b0f4af 100644
--- a/ccan/crc/crc.c
+++ b/ccan/crc/crc.c
@@ -12,7 +12,19 @@
  * 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 <ccan/array_size/array_size.h>
 #include <stdbool.h>
 #include <stdlib.h>
 
@@ -173,3 +185,123 @@ const uint32_t *crc32_ieee_table(void)
 {
 	return crc32_ieee_tab;
 }
+
+/* We only keep the upper 16 bits of the table: the lower 48 are always 0 */
+static uint16_t crc64_tab[] = {
+    0x0000, 0x01b0, 0x0360,
+    0x02d0, 0x06c0, 0x0770,
+    0x05a0, 0x0410, 0x0d80,
+    0x0c30, 0x0ee0, 0x0f50,
+    0x0b40, 0x0af0, 0x0820,
+    0x0990, 0x1b00, 0x1ab0,
+    0x1860, 0x19d0, 0x1dc0,
+    0x1c70, 0x1ea0, 0x1f10,
+    0x1680, 0x1730, 0x15e0,
+    0x1450, 0x1040, 0x11f0,
+    0x1320, 0x1290, 0x3600,
+    0x37b0, 0x3560, 0x34d0,
+    0x30c0, 0x3170, 0x33a0,
+    0x3210, 0x3b80, 0x3a30,
+    0x38e0, 0x3950, 0x3d40,
+    0x3cf0, 0x3e20, 0x3f90,
+    0x2d00, 0x2cb0, 0x2e60,
+    0x2fd0, 0x2bc0, 0x2a70,
+    0x28a0, 0x2910, 0x2080,
+    0x2130, 0x23e0, 0x2250,
+    0x2640, 0x27f0, 0x2520,
+    0x2490, 0x6c00, 0x6db0,
+    0x6f60, 0x6ed0, 0x6ac0,
+    0x6b70, 0x69a0, 0x6810,
+    0x6180, 0x6030, 0x62e0,
+    0x6350, 0x6740, 0x66f0,
+    0x6420, 0x6590, 0x7700,
+    0x76b0, 0x7460, 0x75d0,
+    0x71c0, 0x7070, 0x72a0,
+    0x7310, 0x7a80, 0x7b30,
+    0x79e0, 0x7850, 0x7c40,
+    0x7df0, 0x7f20, 0x7e90,
+    0x5a00, 0x5bb0, 0x5960,
+    0x58d0, 0x5cc0, 0x5d70,
+    0x5fa0, 0x5e10, 0x5780,
+    0x5630, 0x54e0, 0x5550,
+    0x5140, 0x50f0, 0x5220,
+    0x5390, 0x4100, 0x40b0,
+    0x4260, 0x43d0, 0x47c0,
+    0x4670, 0x44a0, 0x4510,
+    0x4c80, 0x4d30, 0x4fe0,
+    0x4e50, 0x4a40, 0x4bf0,
+    0x4920, 0x4890, 0xd800,
+    0xd9b0, 0xdb60, 0xdad0,
+    0xdec0, 0xdf70, 0xdda0,
+    0xdc10, 0xd580, 0xd430,
+    0xd6e0, 0xd750, 0xd340,
+    0xd2f0, 0xd020, 0xd190,
+    0xc300, 0xc2b0, 0xc060,
+    0xc1d0, 0xc5c0, 0xc470,
+    0xc6a0, 0xc710, 0xce80,
+    0xcf30, 0xcde0, 0xcc50,
+    0xc840, 0xc9f0, 0xcb20,
+    0xca90, 0xee00, 0xefb0,
+    0xed60, 0xecd0, 0xe8c0,
+    0xe970, 0xeba0, 0xea10,
+    0xe380, 0xe230, 0xe0e0,
+    0xe150, 0xe540, 0xe4f0,
+    0xe620, 0xe790, 0xf500,
+    0xf4b0, 0xf660, 0xf7d0,
+    0xf3c0, 0xf270, 0xf0a0,
+    0xf110, 0xf880, 0xf930,
+    0xfbe0, 0xfa50, 0xfe40,
+    0xfff0, 0xfd20, 0xfc90,
+    0xb400, 0xb5b0, 0xb760,
+    0xb6d0, 0xb2c0, 0xb370,
+    0xb1a0, 0xb010, 0xb980,
+    0xb830, 0xbae0, 0xbb50,
+    0xbf40, 0xbef0, 0xbc20,
+    0xbd90, 0xaf00, 0xaeb0,
+    0xac60, 0xadd0, 0xa9c0,
+    0xa870, 0xaaa0, 0xab10,
+    0xa280, 0xa330, 0xa1e0,
+    0xa050, 0xa440, 0xa5f0,
+    0xa720, 0xa690, 0x8200,
+    0x83b0, 0x8160, 0x80d0,
+    0x84c0, 0x8570, 0x87a0,
+    0x8610, 0x8f80, 0x8e30,
+    0x8ce0, 0x8d50, 0x8940,
+    0x88f0, 0x8a20, 0x8b90,
+    0x9900, 0x98b0, 0x9a60,
+    0x9bd0, 0x9fc0, 0x9e70,
+    0x9ca0, 0x9d10, 0x9480,
+    0x9530, 0x97e0, 0x9650,
+    0x9240, 0x93f0, 0x9120,
+    0x9090
+};
+
+uint64_t crc64_iso(uint64_t crc, const void *buf, size_t size)
+{
+	const uint8_t *p = buf;
+
+	while (size--) {
+		uint64_t tabval = crc64_tab[(crc ^ *p++) & 0xFFL];
+		tabval <<= 48;
+		crc = tabval ^ (crc >> 8);
+	}
+	return crc;
+}
+
+const uint64_t *crc64_iso_table(void)
+{
+	static uint64_t *fulltab = NULL;
+	unsigned int i;
+
+	if (fulltab)
+		return fulltab;
+
+	fulltab = malloc(sizeof(uint64_t)*ARRAY_SIZE(crc64_tab));
+	if (!fulltab)
+		return NULL;
+
+	for (i = 0; i < ARRAY_SIZE(crc64_tab); i++)
+		fulltab[i] = (uint64_t)crc64_tab[i] << 48;
+
+	return fulltab;
+}