82cadcdcec1d8d28972339c250a2a5d3b5a6ab38
[dragonfly.git] / sbin / hammer2 / icrc.c
1 /*-
2  * Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  */
27 /*
28  | iSCSI
29  | $Id: isc_subr.c 560 2009-05-07 07:37:49Z danny $
30  */
31
32 #include <sys/types.h>
33 #include <sys/uuid.h>
34
35 #include <vfs/hammer2/hammer2_disk.h>
36
37 /*****************************************************************/
38 /*                                                               */
39 /* CRC LOOKUP TABLE                                              */
40 /* ================                                              */
41 /* The following CRC lookup table was generated automagically    */
42 /* by the Rocksoft^tm Model CRC Algorithm Table Generation       */
43 /* Program V1.0 using the following model parameters:            */
44 /*                                                               */
45 /*    Width   : 4 bytes.                                         */
46 /*    Poly    : 0x1EDC6F41L                                      */
47 /*    Reverse : TRUE.                                            */
48 /*                                                               */
49 /* For more information on the Rocksoft^tm Model CRC Algorithm,  */
50 /* see the document titled "A Painless Guide to CRC Error        */
51 /* Detection Algorithms" by Ross Williams                        */
52 /* (ross@guest.adelaide.edu.au.). This document is likely to be  */
53 /* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft".        */
54 /*                                                               */
55 /*****************************************************************/
56
57 static uint32_t crc32Table[256] = {
58     0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
59     0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
60     0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
61     0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
62     0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
63     0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
64     0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
65     0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
66     0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
67     0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
68     0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
69     0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
70     0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
71     0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
72     0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
73     0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
74     0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
75     0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
76     0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
77     0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
78     0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
79     0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
80     0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
81     0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
82     0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
83     0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
84     0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
85     0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
86     0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
87     0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
88     0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
89     0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
90     0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
91     0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
92     0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
93     0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
94     0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
95     0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
96     0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
97     0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
98     0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
99     0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
100     0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
101     0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
102     0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
103     0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
104     0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
105     0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
106     0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
107     0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
108     0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
109     0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
110     0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
111     0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
112     0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
113     0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
114     0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
115     0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
116     0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
117     0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
118     0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
119     0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
120     0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
121     0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
122 };
123
124 uint32_t
125 hammer2_icrc32(const void *buf, size_t size)
126 {
127      const uint8_t *p = buf;
128      uint32_t crc = 0;
129
130      crc = crc ^ 0xffffffff;
131      while (size--)
132           crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
133      crc = crc ^ 0xffffffff;
134      return crc;
135 }
136
137 uint32_t
138 hammer2_icrc32c(const void *buf, size_t size, uint32_t crc)
139 {
140      const uint8_t *p = buf;
141
142      crc = crc ^ 0xffffffff;
143      while (size--)
144           crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
145      crc = crc ^ 0xffffffff;
146      return crc;
147 }