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wdenkaffae2b2002-08-17 09:36:01 +00001/*
2 * This file is derived from crc32.c from the zlib-1.1.3 distribution
3 * by Jean-loup Gailly and Mark Adler.
4 */
5
6/* crc32.c -- compute the CRC-32 of a data stream
7 * Copyright (C) 1995-1998 Mark Adler
8 * For conditions of distribution and use, see copyright notice in zlib.h
9 */
10
11#ifndef USE_HOSTCC /* Shut down "ANSI does not permit..." warnings */
Jon Loeligerb3aff0c2007-07-10 11:19:50 -050012#include <common.h>
Mike Frysinger89cdab72008-03-31 11:02:01 -040013#else
14#include <stdint.h>
wdenkaffae2b2002-08-17 09:36:01 +000015#endif
16
Grant Ericksonf3b6d522008-05-06 16:18:00 -070017#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
Bartlomiej Sieka1de6b282008-04-25 12:10:09 +020018#include <watchdog.h>
Grant Ericksonf3b6d522008-05-06 16:18:00 -070019#endif
wdenkaffae2b2002-08-17 09:36:01 +000020#include "zlib.h"
21
22#define local static
23#define ZEXPORT /* empty */
wdenkaffae2b2002-08-17 09:36:01 +000024
25#ifdef DYNAMIC_CRC_TABLE
26
27local int crc_table_empty = 1;
Mike Frysinger89cdab72008-03-31 11:02:01 -040028local uint32_t crc_table[256];
wdenkaffae2b2002-08-17 09:36:01 +000029local void make_crc_table OF((void));
30
31/*
32 Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
33 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.
34
35 Polynomials over GF(2) are represented in binary, one bit per coefficient,
36 with the lowest powers in the most significant bit. Then adding polynomials
37 is just exclusive-or, and multiplying a polynomial by x is a right shift by
38 one. If we call the above polynomial p, and represent a byte as the
39 polynomial q, also with the lowest power in the most significant bit (so the
40 byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
41 where a mod b means the remainder after dividing a by b.
42
43 This calculation is done using the shift-register method of multiplying and
44 taking the remainder. The register is initialized to zero, and for each
45 incoming bit, x^32 is added mod p to the register if the bit is a one (where
46 x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
47 x (which is shifting right by one and adding x^32 mod p if the bit shifted
48 out is a one). We start with the highest power (least significant bit) of
49 q and repeat for all eight bits of q.
50
51 The table is simply the CRC of all possible eight bit values. This is all
52 the information needed to generate CRC's on data a byte at a time for all
53 combinations of CRC register values and incoming bytes.
54*/
55local void make_crc_table()
56{
Mike Frysinger89cdab72008-03-31 11:02:01 -040057 uint32_t c;
wdenkaffae2b2002-08-17 09:36:01 +000058 int n, k;
Wolfgang Denk7ed40112008-04-26 00:34:42 +020059 uLong poly; /* polynomial exclusive-or pattern */
wdenkaffae2b2002-08-17 09:36:01 +000060 /* terms of polynomial defining this crc (except x^32): */
61 static const Byte p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
62
63 /* make exclusive-or pattern from polynomial (0xedb88320L) */
64 poly = 0L;
65 for (n = 0; n < sizeof(p)/sizeof(Byte); n++)
66 poly |= 1L << (31 - p[n]);
67
68 for (n = 0; n < 256; n++)
69 {
70 c = (uLong)n;
71 for (k = 0; k < 8; k++)
72 c = c & 1 ? poly ^ (c >> 1) : c >> 1;
73 crc_table[n] = c;
74 }
75 crc_table_empty = 0;
76}
77#else
78/* ========================================================================
79 * Table of CRC-32's of all single-byte values (made by make_crc_table)
80 */
Mike Frysinger89cdab72008-03-31 11:02:01 -040081local const uint32_t crc_table[256] = {
wdenkaffae2b2002-08-17 09:36:01 +000082 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
83 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
84 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
85 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
86 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
87 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
88 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
89 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
90 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
91 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
92 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
93 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
94 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
95 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
96 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
97 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
98 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
99 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
100 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
101 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
102 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
103 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
104 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
105 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
106 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
107 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
108 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
109 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
110 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
111 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
112 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
113 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
114 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
115 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
116 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
117 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
118 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
119 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
120 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
121 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
122 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
123 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
124 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
125 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
126 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
127 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
128 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
129 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
130 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
131 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
132 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
133 0x2d02ef8dL
134};
135#endif
136
137#if 0
138/* =========================================================================
139 * This function can be used by asm versions of crc32()
140 */
Mike Frysinger89cdab72008-03-31 11:02:01 -0400141const uint32_t * ZEXPORT get_crc_table()
wdenkaffae2b2002-08-17 09:36:01 +0000142{
143#ifdef DYNAMIC_CRC_TABLE
144 if (crc_table_empty) make_crc_table();
145#endif
Mike Frysinger89cdab72008-03-31 11:02:01 -0400146 return (const uint32_t *)crc_table;
wdenkaffae2b2002-08-17 09:36:01 +0000147}
148#endif
149
150/* ========================================================================= */
151#define DO1(buf) crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
152#define DO2(buf) DO1(buf); DO1(buf);
153#define DO4(buf) DO2(buf); DO2(buf);
154#define DO8(buf) DO4(buf); DO4(buf);
155
156/* ========================================================================= */
Wolfgang Denk03ccdbc2008-04-25 11:52:21 +0200157uint32_t ZEXPORT crc32 (uint32_t crc, const Bytef *buf, uInt len)
wdenkaffae2b2002-08-17 09:36:01 +0000158{
wdenkaffae2b2002-08-17 09:36:01 +0000159#ifdef DYNAMIC_CRC_TABLE
160 if (crc_table_empty)
161 make_crc_table();
162#endif
163 crc = crc ^ 0xffffffffL;
164 while (len >= 8)
165 {
166 DO8(buf);
167 len -= 8;
168 }
169 if (len) do {
170 DO1(buf);
171 } while (--len);
172 return crc ^ 0xffffffffL;
173}
174
Jon Loeliger67350562007-07-09 18:05:38 -0500175#if defined(CONFIG_CMD_JFFS2) || \
176 (defined(CONFIG_CMD_NAND) \
Jon Loeliger0c505db2007-06-11 19:03:03 -0500177 && !defined(CFG_NAND_LEGACY))
wdenkaffae2b2002-08-17 09:36:01 +0000178
179/* No ones complement version. JFFS2 (and other things ?)
180 * don't use ones compliment in their CRC calculations.
181 */
Mike Frysinger89cdab72008-03-31 11:02:01 -0400182uint32_t ZEXPORT crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len)
wdenkaffae2b2002-08-17 09:36:01 +0000183{
wdenkaffae2b2002-08-17 09:36:01 +0000184#ifdef DYNAMIC_CRC_TABLE
185 if (crc_table_empty)
186 make_crc_table();
187#endif
188 while (len >= 8)
189 {
190 DO8(buf);
191 len -= 8;
192 }
193 if (len) do {
194 DO1(buf);
195 } while (--len);
196
197 return crc;
198}
199
Jon Loeligerb3aff0c2007-07-10 11:19:50 -0500200#endif
Bartlomiej Sieka215b01b2008-04-22 12:27:56 +0200201
202/*
203 * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes
204 * of input.
205 */
Wolfgang Denk03ccdbc2008-04-25 11:52:21 +0200206uint32_t ZEXPORT crc32_wd (uint32_t crc,
207 const unsigned char *buf,
208 uInt len, uInt chunk_sz)
Bartlomiej Sieka215b01b2008-04-22 12:27:56 +0200209{
210#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
211 const unsigned char *end, *curr;
212 int chunk;
213
214 curr = buf;
215 end = buf + len;
216 while (curr < end) {
217 chunk = end - curr;
218 if (chunk > chunk_sz)
219 chunk = chunk_sz;
220 crc = crc32 (crc, curr, chunk);
221 curr += chunk;
222 WATCHDOG_RESET ();
223 }
224#else
Wolfgang Denk7ed40112008-04-26 00:34:42 +0200225 crc = crc32 (crc, buf, len);
Bartlomiej Sieka215b01b2008-04-22 12:27:56 +0200226#endif
227
228 return crc;
229}