-/*-
+/* crc32_ieee code:
* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or
* code or tables extracted from it, as desired without restriction.
+ */
+
+/* crc32c code taken from 2.6.29 Linux kernel crypto/crc32c.c:
+ * Copyright (c) 2004 Cisco Systems, Inc.
+ * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
*
- * First, the polynomial itself and its table of feedback terms. The
- * polynomial is
- * X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
- *
- * Note that we take it "backwards" and put the highest-order term in
- * the lowest-order bit. The X^32 term is "implied"; the LSB is the
- * X^31 term, etc. The X^0 term (usually shown as "+1") results in
- * the MSB being 1
- *
- * Note that the usual hardware shift register implementation, which
- * is what we're using (we're merely optimizing it by doing eight-bit
- * chunks at a time) shifts bits into the lowest-order term. In our
- * implementation, that means shifting towards the right. Why do we
- * do it this way? Because the calculated CRC must be transmitted in
- * order from highest-order term to lowest-order term. UARTs transmit
- * characters in order from LSB to MSB. By storing the CRC this way
- * we hand it to the UART in the order low-byte to high-byte; the UART
- * sends each low-bit to hight-bit; and the result is transmission bit
- * by bit from highest- to lowest-order term without requiring any bit
- * shuffling on our part. Reception works similarly
- *
- * The feedback terms table consists of 256, 32-bit entries. Notes
- *
- * The table can be generated at runtime if desired; code to do so
- * is shown later. It might not be obvious, but the feedback
- * terms simply represent the results of eight shift/xor opera
- * tions for all combinations of data and CRC register values
- *
- * The values must be right-shifted by eight bits by the "updcrc
- * logic; the shift must be unsigned (bring in zeroes). On some
- * hardware you could probably optimize the shift in assembler by
- * using byte-swap instructions
- * polynomial $edb88320
- *
+ * 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. */
+
+/* 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
*
- * CRC32 code derived from work by Gary S. Brown.
+ * 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>
-static const uint32_t crc32_tab[] = {
+static const uint32_t crc32_ieee_tab[] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};
-uint32_t crc32(const void *buf, size_t size)
+uint32_t crc32_ieee(uint32_t crc, const void *buf, size_t size)
{
const uint8_t *p;
- uint32_t crc;
p = buf;
- crc = ~0U;
+ crc ^= ~0U;
while (size--)
- crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
+ crc = crc32_ieee_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
return crc ^ ~0U;
}
+
+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;
+}
projects / ccan / blobdiff