Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux...
[linux-btrfs-devel.git] / drivers / staging / vt6655 / tcrc.c
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1 /*
2 * Copyright (c) 2003 VIA Networking, Inc. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 * File: tcrc.c
21 * Purpose: Implement functions to caculate CRC
23 * Author: Tevin Chen
25 * Date: May 21, 1996
27 * Functions:
28 * CRCdwCrc32 -
29 * CRCdwGetCrc32 -
30 * CRCdwGetCrc32Ex -
32 * Revision History:
36 #include "tcrc.h"
38 /*--------------------- Static Definitions -------------------------*/
40 /*--------------------- Static Classes ----------------------------*/
42 /*--------------------- Static Variables --------------------------*/
44 // 32-bit CRC table
45 static const unsigned long s_adwCrc32Table[256] = {
46 0x00000000L, 0x77073096L, 0xEE0E612CL, 0x990951BAL,
47 0x076DC419L, 0x706AF48FL, 0xE963A535L, 0x9E6495A3L,
48 0x0EDB8832L, 0x79DCB8A4L, 0xE0D5E91EL, 0x97D2D988L,
49 0x09B64C2BL, 0x7EB17CBDL, 0xE7B82D07L, 0x90BF1D91L,
50 0x1DB71064L, 0x6AB020F2L, 0xF3B97148L, 0x84BE41DEL,
51 0x1ADAD47DL, 0x6DDDE4EBL, 0xF4D4B551L, 0x83D385C7L,
52 0x136C9856L, 0x646BA8C0L, 0xFD62F97AL, 0x8A65C9ECL,
53 0x14015C4FL, 0x63066CD9L, 0xFA0F3D63L, 0x8D080DF5L,
54 0x3B6E20C8L, 0x4C69105EL, 0xD56041E4L, 0xA2677172L,
55 0x3C03E4D1L, 0x4B04D447L, 0xD20D85FDL, 0xA50AB56BL,
56 0x35B5A8FAL, 0x42B2986CL, 0xDBBBC9D6L, 0xACBCF940L,
57 0x32D86CE3L, 0x45DF5C75L, 0xDCD60DCFL, 0xABD13D59L,
58 0x26D930ACL, 0x51DE003AL, 0xC8D75180L, 0xBFD06116L,
59 0x21B4F4B5L, 0x56B3C423L, 0xCFBA9599L, 0xB8BDA50FL,
60 0x2802B89EL, 0x5F058808L, 0xC60CD9B2L, 0xB10BE924L,
61 0x2F6F7C87L, 0x58684C11L, 0xC1611DABL, 0xB6662D3DL,
62 0x76DC4190L, 0x01DB7106L, 0x98D220BCL, 0xEFD5102AL,
63 0x71B18589L, 0x06B6B51FL, 0x9FBFE4A5L, 0xE8B8D433L,
64 0x7807C9A2L, 0x0F00F934L, 0x9609A88EL, 0xE10E9818L,
65 0x7F6A0DBBL, 0x086D3D2DL, 0x91646C97L, 0xE6635C01L,
66 0x6B6B51F4L, 0x1C6C6162L, 0x856530D8L, 0xF262004EL,
67 0x6C0695EDL, 0x1B01A57BL, 0x8208F4C1L, 0xF50FC457L,
68 0x65B0D9C6L, 0x12B7E950L, 0x8BBEB8EAL, 0xFCB9887CL,
69 0x62DD1DDFL, 0x15DA2D49L, 0x8CD37CF3L, 0xFBD44C65L,
70 0x4DB26158L, 0x3AB551CEL, 0xA3BC0074L, 0xD4BB30E2L,
71 0x4ADFA541L, 0x3DD895D7L, 0xA4D1C46DL, 0xD3D6F4FBL,
72 0x4369E96AL, 0x346ED9FCL, 0xAD678846L, 0xDA60B8D0L,
73 0x44042D73L, 0x33031DE5L, 0xAA0A4C5FL, 0xDD0D7CC9L,
74 0x5005713CL, 0x270241AAL, 0xBE0B1010L, 0xC90C2086L,
75 0x5768B525L, 0x206F85B3L, 0xB966D409L, 0xCE61E49FL,
76 0x5EDEF90EL, 0x29D9C998L, 0xB0D09822L, 0xC7D7A8B4L,
77 0x59B33D17L, 0x2EB40D81L, 0xB7BD5C3BL, 0xC0BA6CADL,
78 0xEDB88320L, 0x9ABFB3B6L, 0x03B6E20CL, 0x74B1D29AL,
79 0xEAD54739L, 0x9DD277AFL, 0x04DB2615L, 0x73DC1683L,
80 0xE3630B12L, 0x94643B84L, 0x0D6D6A3EL, 0x7A6A5AA8L,
81 0xE40ECF0BL, 0x9309FF9DL, 0x0A00AE27L, 0x7D079EB1L,
82 0xF00F9344L, 0x8708A3D2L, 0x1E01F268L, 0x6906C2FEL,
83 0xF762575DL, 0x806567CBL, 0x196C3671L, 0x6E6B06E7L,
84 0xFED41B76L, 0x89D32BE0L, 0x10DA7A5AL, 0x67DD4ACCL,
85 0xF9B9DF6FL, 0x8EBEEFF9L, 0x17B7BE43L, 0x60B08ED5L,
86 0xD6D6A3E8L, 0xA1D1937EL, 0x38D8C2C4L, 0x4FDFF252L,
87 0xD1BB67F1L, 0xA6BC5767L, 0x3FB506DDL, 0x48B2364BL,
88 0xD80D2BDAL, 0xAF0A1B4CL, 0x36034AF6L, 0x41047A60L,
89 0xDF60EFC3L, 0xA867DF55L, 0x316E8EEFL, 0x4669BE79L,
90 0xCB61B38CL, 0xBC66831AL, 0x256FD2A0L, 0x5268E236L,
91 0xCC0C7795L, 0xBB0B4703L, 0x220216B9L, 0x5505262FL,
92 0xC5BA3BBEL, 0xB2BD0B28L, 0x2BB45A92L, 0x5CB36A04L,
93 0xC2D7FFA7L, 0xB5D0CF31L, 0x2CD99E8BL, 0x5BDEAE1DL,
94 0x9B64C2B0L, 0xEC63F226L, 0x756AA39CL, 0x026D930AL,
95 0x9C0906A9L, 0xEB0E363FL, 0x72076785L, 0x05005713L,
96 0x95BF4A82L, 0xE2B87A14L, 0x7BB12BAEL, 0x0CB61B38L,
97 0x92D28E9BL, 0xE5D5BE0DL, 0x7CDCEFB7L, 0x0BDBDF21L,
98 0x86D3D2D4L, 0xF1D4E242L, 0x68DDB3F8L, 0x1FDA836EL,
99 0x81BE16CDL, 0xF6B9265BL, 0x6FB077E1L, 0x18B74777L,
100 0x88085AE6L, 0xFF0F6A70L, 0x66063BCAL, 0x11010B5CL,
101 0x8F659EFFL, 0xF862AE69L, 0x616BFFD3L, 0x166CCF45L,
102 0xA00AE278L, 0xD70DD2EEL, 0x4E048354L, 0x3903B3C2L,
103 0xA7672661L, 0xD06016F7L, 0x4969474DL, 0x3E6E77DBL,
104 0xAED16A4AL, 0xD9D65ADCL, 0x40DF0B66L, 0x37D83BF0L,
105 0xA9BCAE53L, 0xDEBB9EC5L, 0x47B2CF7FL, 0x30B5FFE9L,
106 0xBDBDF21CL, 0xCABAC28AL, 0x53B39330L, 0x24B4A3A6L,
107 0xBAD03605L, 0xCDD70693L, 0x54DE5729L, 0x23D967BFL,
108 0xB3667A2EL, 0xC4614AB8L, 0x5D681B02L, 0x2A6F2B94L,
109 0xB40BBE37L, 0xC30C8EA1L, 0x5A05DF1BL, 0x2D02EF8DL
112 /*--------------------- Static Functions --------------------------*/
114 /*--------------------- Export Variables --------------------------*/
121 * Description:
122 * Generate a CRC-32 from the data stream
124 * Parameters:
125 * In:
126 * pbyData - the data stream
127 * cbByte - the length of the stream
128 * dwCrcSeed - Seed for CRC32
129 * Out:
130 * none
132 * Return Value: CRC-32
135 unsigned long CRCdwCrc32 (unsigned char *pbyData, unsigned int cbByte, unsigned long dwCrcSeed)
137 unsigned long dwCrc;
139 dwCrc = dwCrcSeed;
140 while (cbByte--) {
141 dwCrc = s_adwCrc32Table[(unsigned char)((dwCrc ^ (*pbyData)) & 0xFF)] ^ (dwCrc >> 8);
142 pbyData++;
145 return dwCrc;
151 * Description:
152 * To test CRC generator, input 8 bytes packet
153 * -- 0xff 0xff 0xff 0xff 0x00 0x00 0x00 0x00
154 * the generated CRC should be
155 * -- 0xff 0xff 0xff 0xff
157 * Parameters:
158 * In:
159 * pbyData - the data stream
160 * cbByte - the length of the stream
161 * Out:
162 * none
164 * Return Value: CRC-32
167 unsigned long CRCdwGetCrc32 (unsigned char *pbyData, unsigned int cbByte)
169 return ~CRCdwCrc32(pbyData, cbByte, 0xFFFFFFFFL);
175 * Description:
177 * NOTE.... Because CRCdwGetCrc32Ex() is an iteration function,
178 * this means we will use the output of CRCdwGetCrc32Ex()
179 * to be a new argument to do next CRCdwGetCrc32Ex() calculation.
180 * Thus, the final result must be inverted to be the
181 * correct answer.
183 * Parameters:
184 * In:
185 * pbyData - the data stream
186 * cbByte - the length of the stream
187 * Out:
188 * none
190 * Return Value: CRC-32
193 unsigned long CRCdwGetCrc32Ex(unsigned char *pbyData, unsigned int cbByte, unsigned long dwPreCRC)
195 return CRCdwCrc32(pbyData, cbByte, dwPreCRC);