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 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 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 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 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 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