1 /* $NetBSD: crc.c,v 1.1.1.1 2014/04/01 16:16:06 jakllsch Exp $ */
2
3 /*++
4
5 Copyright (c) 1998 Intel Corporation
6
7 Module Name:
8
9 crc.c
10
11 Abstract:
12
13 CRC32 functions
14
15
16
17 Revision History
18
19 --*/
20
21 #include "lib.h"
22
23
24 UINT32 CRCTable[256] = {
25 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
26 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
27 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
28 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
29 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
30 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
31 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
32 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
33 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
34 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
35 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
36 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
37 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
38 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
39 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
40 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
41 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
42 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
43 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
44 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
45 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
46 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
47 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
48 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
49 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
50 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
51 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
52 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
53 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
54 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
55 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
56 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
57 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
58 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
59 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
60 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
61 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
62 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
63 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
64 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
65 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
66 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
67 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
68 };
69
70
71
72 VOID
SetCrc(IN OUT EFI_TABLE_HEADER * Hdr)73 SetCrc (
74 IN OUT EFI_TABLE_HEADER *Hdr
75 )
76 /*++
77
78 Routine Description:
79
80 Updates the CRC32 value in the table header
81
82 Arguments:
83
84 Hdr - The table to update
85
86 Returns:
87
88 None
89
90 --*/
91 {
92 SetCrcAltSize (Hdr->HeaderSize, Hdr);
93 }
94
95 VOID
SetCrcAltSize(IN UINTN Size,IN OUT EFI_TABLE_HEADER * Hdr)96 SetCrcAltSize (
97 IN UINTN Size,
98 IN OUT EFI_TABLE_HEADER *Hdr
99 )
100 /*++
101
102 Routine Description:
103
104 Updates the CRC32 value in the table header
105
106 Arguments:
107
108 Hdr - The table to update
109
110 Returns:
111
112 None
113
114 --*/
115 {
116 Hdr->CRC32 = 0;
117 Hdr->CRC32 = CalculateCrc((UINT8 *)Hdr, Size);
118 }
119
120
121 BOOLEAN
CheckCrc(IN UINTN MaxSize,IN OUT EFI_TABLE_HEADER * Hdr)122 CheckCrc (
123 IN UINTN MaxSize,
124 IN OUT EFI_TABLE_HEADER *Hdr
125 )
126 /*++
127
128 Routine Description:
129
130 Checks the CRC32 value in the table header
131
132 Arguments:
133
134 Hdr - The table to check
135
136 Returns:
137
138 TRUE if the CRC is OK in the table
139
140 --*/
141 {
142 return CheckCrcAltSize (MaxSize, Hdr->HeaderSize, Hdr);
143 }
144
145
146
147
148 BOOLEAN
CheckCrcAltSize(IN UINTN MaxSize,IN UINTN Size,IN OUT EFI_TABLE_HEADER * Hdr)149 CheckCrcAltSize (
150 IN UINTN MaxSize,
151 IN UINTN Size,
152 IN OUT EFI_TABLE_HEADER *Hdr
153 )
154 /*++
155
156 Routine Description:
157
158 Checks the CRC32 value in the table header
159
160 Arguments:
161
162 Hdr - The table to check
163
164 Returns:
165
166 TRUE if the CRC is OK in the table
167
168 --*/
169 {
170 UINT32 Crc;
171 UINT32 OrgCrc;
172 BOOLEAN f;
173
174 if (Size == 0) {
175 //
176 // If header size is 0 CRC will pass so return FALSE here
177 //
178 return FALSE;
179 }
180 if (MaxSize && Size > MaxSize) {
181 DEBUG((D_ERROR, "CheckCrc32: Size > MaxSize\n"));
182 return FALSE;
183 }
184
185 // clear old crc from header
186 OrgCrc = Hdr->CRC32;
187 Hdr->CRC32 = 0;
188 Crc = CalculateCrc((UINT8 *)Hdr, Size);
189
190 // set restults
191 Hdr->CRC32 = OrgCrc;
192
193 // return status
194 f = OrgCrc == (UINT32) Crc;
195 if (!f) {
196 DEBUG((D_ERROR, "CheckCrc32: Crc check failed\n"));
197 }
198
199 return f;
200 }
201
202
203 UINT32
CalculateCrc(UINT8 * pt,UINTN Size)204 CalculateCrc (
205 UINT8 *pt,
206 UINTN Size
207 )
208 {
209 UINTN Crc;
210
211 // compute crc
212 Crc = 0xffffffff;
213 while (Size) {
214 Crc = (Crc >> 8) ^ CRCTable[(UINT8) Crc ^ *pt];
215 pt += 1;
216 Size -= 1;
217 }
218 Crc = Crc ^ 0xffffffff;
219 return (UINT32)Crc;
220 }
221