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