Annotation of elwix/tools/uboot_mkimage/lib/crc32.c, revision 1.1.1.1
1.1 misho 1: /*
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
12: #include <common.h>
13: #endif
14: #include <compiler.h>
15: #include <u-boot/crc.h>
16:
17: #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
18: #include <watchdog.h>
19: #endif
20: #include "u-boot/zlib.h"
21:
22: #define local static
23: #define ZEXPORT /* empty */
24:
25: #define tole(x) cpu_to_le32(x)
26:
27: #ifdef DYNAMIC_CRC_TABLE
28:
29: local int crc_table_empty = 1;
30: local uint32_t crc_table[256];
31: local void make_crc_table OF((void));
32:
33: /*
34: Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
35: 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.
36:
37: Polynomials over GF(2) are represented in binary, one bit per coefficient,
38: with the lowest powers in the most significant bit. Then adding polynomials
39: is just exclusive-or, and multiplying a polynomial by x is a right shift by
40: one. If we call the above polynomial p, and represent a byte as the
41: polynomial q, also with the lowest power in the most significant bit (so the
42: byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
43: where a mod b means the remainder after dividing a by b.
44:
45: This calculation is done using the shift-register method of multiplying and
46: taking the remainder. The register is initialized to zero, and for each
47: incoming bit, x^32 is added mod p to the register if the bit is a one (where
48: x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
49: x (which is shifting right by one and adding x^32 mod p if the bit shifted
50: out is a one). We start with the highest power (least significant bit) of
51: q and repeat for all eight bits of q.
52:
53: The table is simply the CRC of all possible eight bit values. This is all
54: the information needed to generate CRC's on data a byte at a time for all
55: combinations of CRC register values and incoming bytes.
56: */
57: local void make_crc_table()
58: {
59: uint32_t c;
60: int n, k;
61: uLong poly; /* polynomial exclusive-or pattern */
62: /* terms of polynomial defining this crc (except x^32): */
63: static const Byte p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
64:
65: /* make exclusive-or pattern from polynomial (0xedb88320L) */
66: poly = 0L;
67: for (n = 0; n < sizeof(p)/sizeof(Byte); n++)
68: poly |= 1L << (31 - p[n]);
69:
70: for (n = 0; n < 256; n++)
71: {
72: c = (uLong)n;
73: for (k = 0; k < 8; k++)
74: c = c & 1 ? poly ^ (c >> 1) : c >> 1;
75: crc_table[n] = tole(c);
76: }
77: crc_table_empty = 0;
78: }
79: #else
80: /* ========================================================================
81: * Table of CRC-32's of all single-byte values (made by make_crc_table)
82: */
83:
84: local const uint32_t crc_table[256] = {
85: tole(0x00000000L), tole(0x77073096L), tole(0xee0e612cL), tole(0x990951baL),
86: tole(0x076dc419L), tole(0x706af48fL), tole(0xe963a535L), tole(0x9e6495a3L),
87: tole(0x0edb8832L), tole(0x79dcb8a4L), tole(0xe0d5e91eL), tole(0x97d2d988L),
88: tole(0x09b64c2bL), tole(0x7eb17cbdL), tole(0xe7b82d07L), tole(0x90bf1d91L),
89: tole(0x1db71064L), tole(0x6ab020f2L), tole(0xf3b97148L), tole(0x84be41deL),
90: tole(0x1adad47dL), tole(0x6ddde4ebL), tole(0xf4d4b551L), tole(0x83d385c7L),
91: tole(0x136c9856L), tole(0x646ba8c0L), tole(0xfd62f97aL), tole(0x8a65c9ecL),
92: tole(0x14015c4fL), tole(0x63066cd9L), tole(0xfa0f3d63L), tole(0x8d080df5L),
93: tole(0x3b6e20c8L), tole(0x4c69105eL), tole(0xd56041e4L), tole(0xa2677172L),
94: tole(0x3c03e4d1L), tole(0x4b04d447L), tole(0xd20d85fdL), tole(0xa50ab56bL),
95: tole(0x35b5a8faL), tole(0x42b2986cL), tole(0xdbbbc9d6L), tole(0xacbcf940L),
96: tole(0x32d86ce3L), tole(0x45df5c75L), tole(0xdcd60dcfL), tole(0xabd13d59L),
97: tole(0x26d930acL), tole(0x51de003aL), tole(0xc8d75180L), tole(0xbfd06116L),
98: tole(0x21b4f4b5L), tole(0x56b3c423L), tole(0xcfba9599L), tole(0xb8bda50fL),
99: tole(0x2802b89eL), tole(0x5f058808L), tole(0xc60cd9b2L), tole(0xb10be924L),
100: tole(0x2f6f7c87L), tole(0x58684c11L), tole(0xc1611dabL), tole(0xb6662d3dL),
101: tole(0x76dc4190L), tole(0x01db7106L), tole(0x98d220bcL), tole(0xefd5102aL),
102: tole(0x71b18589L), tole(0x06b6b51fL), tole(0x9fbfe4a5L), tole(0xe8b8d433L),
103: tole(0x7807c9a2L), tole(0x0f00f934L), tole(0x9609a88eL), tole(0xe10e9818L),
104: tole(0x7f6a0dbbL), tole(0x086d3d2dL), tole(0x91646c97L), tole(0xe6635c01L),
105: tole(0x6b6b51f4L), tole(0x1c6c6162L), tole(0x856530d8L), tole(0xf262004eL),
106: tole(0x6c0695edL), tole(0x1b01a57bL), tole(0x8208f4c1L), tole(0xf50fc457L),
107: tole(0x65b0d9c6L), tole(0x12b7e950L), tole(0x8bbeb8eaL), tole(0xfcb9887cL),
108: tole(0x62dd1ddfL), tole(0x15da2d49L), tole(0x8cd37cf3L), tole(0xfbd44c65L),
109: tole(0x4db26158L), tole(0x3ab551ceL), tole(0xa3bc0074L), tole(0xd4bb30e2L),
110: tole(0x4adfa541L), tole(0x3dd895d7L), tole(0xa4d1c46dL), tole(0xd3d6f4fbL),
111: tole(0x4369e96aL), tole(0x346ed9fcL), tole(0xad678846L), tole(0xda60b8d0L),
112: tole(0x44042d73L), tole(0x33031de5L), tole(0xaa0a4c5fL), tole(0xdd0d7cc9L),
113: tole(0x5005713cL), tole(0x270241aaL), tole(0xbe0b1010L), tole(0xc90c2086L),
114: tole(0x5768b525L), tole(0x206f85b3L), tole(0xb966d409L), tole(0xce61e49fL),
115: tole(0x5edef90eL), tole(0x29d9c998L), tole(0xb0d09822L), tole(0xc7d7a8b4L),
116: tole(0x59b33d17L), tole(0x2eb40d81L), tole(0xb7bd5c3bL), tole(0xc0ba6cadL),
117: tole(0xedb88320L), tole(0x9abfb3b6L), tole(0x03b6e20cL), tole(0x74b1d29aL),
118: tole(0xead54739L), tole(0x9dd277afL), tole(0x04db2615L), tole(0x73dc1683L),
119: tole(0xe3630b12L), tole(0x94643b84L), tole(0x0d6d6a3eL), tole(0x7a6a5aa8L),
120: tole(0xe40ecf0bL), tole(0x9309ff9dL), tole(0x0a00ae27L), tole(0x7d079eb1L),
121: tole(0xf00f9344L), tole(0x8708a3d2L), tole(0x1e01f268L), tole(0x6906c2feL),
122: tole(0xf762575dL), tole(0x806567cbL), tole(0x196c3671L), tole(0x6e6b06e7L),
123: tole(0xfed41b76L), tole(0x89d32be0L), tole(0x10da7a5aL), tole(0x67dd4accL),
124: tole(0xf9b9df6fL), tole(0x8ebeeff9L), tole(0x17b7be43L), tole(0x60b08ed5L),
125: tole(0xd6d6a3e8L), tole(0xa1d1937eL), tole(0x38d8c2c4L), tole(0x4fdff252L),
126: tole(0xd1bb67f1L), tole(0xa6bc5767L), tole(0x3fb506ddL), tole(0x48b2364bL),
127: tole(0xd80d2bdaL), tole(0xaf0a1b4cL), tole(0x36034af6L), tole(0x41047a60L),
128: tole(0xdf60efc3L), tole(0xa867df55L), tole(0x316e8eefL), tole(0x4669be79L),
129: tole(0xcb61b38cL), tole(0xbc66831aL), tole(0x256fd2a0L), tole(0x5268e236L),
130: tole(0xcc0c7795L), tole(0xbb0b4703L), tole(0x220216b9L), tole(0x5505262fL),
131: tole(0xc5ba3bbeL), tole(0xb2bd0b28L), tole(0x2bb45a92L), tole(0x5cb36a04L),
132: tole(0xc2d7ffa7L), tole(0xb5d0cf31L), tole(0x2cd99e8bL), tole(0x5bdeae1dL),
133: tole(0x9b64c2b0L), tole(0xec63f226L), tole(0x756aa39cL), tole(0x026d930aL),
134: tole(0x9c0906a9L), tole(0xeb0e363fL), tole(0x72076785L), tole(0x05005713L),
135: tole(0x95bf4a82L), tole(0xe2b87a14L), tole(0x7bb12baeL), tole(0x0cb61b38L),
136: tole(0x92d28e9bL), tole(0xe5d5be0dL), tole(0x7cdcefb7L), tole(0x0bdbdf21L),
137: tole(0x86d3d2d4L), tole(0xf1d4e242L), tole(0x68ddb3f8L), tole(0x1fda836eL),
138: tole(0x81be16cdL), tole(0xf6b9265bL), tole(0x6fb077e1L), tole(0x18b74777L),
139: tole(0x88085ae6L), tole(0xff0f6a70L), tole(0x66063bcaL), tole(0x11010b5cL),
140: tole(0x8f659effL), tole(0xf862ae69L), tole(0x616bffd3L), tole(0x166ccf45L),
141: tole(0xa00ae278L), tole(0xd70dd2eeL), tole(0x4e048354L), tole(0x3903b3c2L),
142: tole(0xa7672661L), tole(0xd06016f7L), tole(0x4969474dL), tole(0x3e6e77dbL),
143: tole(0xaed16a4aL), tole(0xd9d65adcL), tole(0x40df0b66L), tole(0x37d83bf0L),
144: tole(0xa9bcae53L), tole(0xdebb9ec5L), tole(0x47b2cf7fL), tole(0x30b5ffe9L),
145: tole(0xbdbdf21cL), tole(0xcabac28aL), tole(0x53b39330L), tole(0x24b4a3a6L),
146: tole(0xbad03605L), tole(0xcdd70693L), tole(0x54de5729L), tole(0x23d967bfL),
147: tole(0xb3667a2eL), tole(0xc4614ab8L), tole(0x5d681b02L), tole(0x2a6f2b94L),
148: tole(0xb40bbe37L), tole(0xc30c8ea1L), tole(0x5a05df1bL), tole(0x2d02ef8dL)
149: };
150: #endif
151:
152: #if 0
153: /* =========================================================================
154: * This function can be used by asm versions of crc32()
155: */
156: const uint32_t * ZEXPORT get_crc_table()
157: {
158: #ifdef DYNAMIC_CRC_TABLE
159: if (crc_table_empty) make_crc_table();
160: #endif
161: return (const uint32_t *)crc_table;
162: }
163: #endif
164:
165: /* ========================================================================= */
166: # if __BYTE_ORDER == __LITTLE_ENDIAN
167: # define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc >> 8)
168: # else
169: # define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
170: # endif
171:
172: /* ========================================================================= */
173:
174: /* No ones complement version. JFFS2 (and other things ?)
175: * don't use ones compliment in their CRC calculations.
176: */
177: uint32_t ZEXPORT crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len)
178: {
179: const uint32_t *tab = crc_table;
180: const uint32_t *b =(const uint32_t *)buf;
181: size_t rem_len;
182: #ifdef DYNAMIC_CRC_TABLE
183: if (crc_table_empty)
184: make_crc_table();
185: #endif
186: crc = cpu_to_le32(crc);
187: /* Align it */
188: if (((long)b) & 3 && len) {
189: uint8_t *p = (uint8_t *)b;
190: do {
191: DO_CRC(*p++);
192: } while ((--len) && ((long)p)&3);
193: b = (uint32_t *)p;
194: }
195:
196: rem_len = len & 3;
197: len = len >> 2;
198: for (--b; len; --len) {
199: /* load data 32 bits wide, xor data 32 bits wide. */
200: crc ^= *++b; /* use pre increment for speed */
201: DO_CRC(0);
202: DO_CRC(0);
203: DO_CRC(0);
204: DO_CRC(0);
205: }
206: len = rem_len;
207: /* And the last few bytes */
208: if (len) {
209: uint8_t *p = (uint8_t *)(b + 1) - 1;
210: do {
211: DO_CRC(*++p); /* use pre increment for speed */
212: } while (--len);
213: }
214:
215: return le32_to_cpu(crc);
216: }
217: #undef DO_CRC
218:
219: uint32_t ZEXPORT crc32 (uint32_t crc, const Bytef *p, uInt len)
220: {
221: return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL;
222: }
223:
224: /*
225: * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes
226: * of input.
227: */
228: uint32_t ZEXPORT crc32_wd (uint32_t crc,
229: const unsigned char *buf,
230: uInt len, uInt chunk_sz)
231: {
232: #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
233: const unsigned char *end, *curr;
234: int chunk;
235:
236: curr = buf;
237: end = buf + len;
238: while (curr < end) {
239: chunk = end - curr;
240: if (chunk > chunk_sz)
241: chunk = chunk_sz;
242: crc = crc32 (crc, curr, chunk);
243: curr += chunk;
244: WATCHDOG_RESET ();
245: }
246: #else
247: crc = crc32 (crc, buf, len);
248: #endif
249:
250: return crc;
251: }
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