• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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